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面包屑導航結束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>基于ANSYS Workbench立柱筋板布局對加工中心動態特性影響分析<small></small></a></h3> </div> <!-- 頁面標題結束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> 現代制造加工業正向著高精度、高質量、 高效率的方向迅猛發展，因此數控機床的加工 性能面臨著許多挑戰，而數控機床的動態特性 是衡量其是否具備良好的加工性能的指標之 _。數控機床需要提高本身的動態性能，從而 提高其加工精度和加工質量來滿足現代制造業 的需求。原加工中心是專門為加工航空發動機<br /> 葉輪而設計的機床，其動態性能的好壞直接影 響到對葉輪的加工精度。該加工中心機械主體 結構包括床身、立柱、滑鞍、主軸箱、雙驅搖 籃式擺臺等主要功能部件。機床薄弱部件的動 態剛度將會直接影響到整機的動態特性，因而 需要提升其動力學特性，滿足機床對加工質量 和加工精度的要求[1]。下面以模態理論分析技<br /> 術為基礎，采用ANSYS Workbench模態分析軟 件分析立柱筋板不同布局形式對銑削加工中的 動態特性影響。<br /> 1模態分析理論<br /> 模態分析主要是研究系統物理參數模型、 模態參數模型以及非參數模型的關系，并通過 _定手段確定這些系統模型的理論及其應用的 _門學科[2]。隨著計算機技術的高速發展，模 態分析得到快速的發展，并在各個工程領域中 得到普及和深層次的應用。<br /> 2加工中心模態分析<br /> 目前，高校及科研院所在對數控機床設計 階段的模態分析主要是運用有限元軟件完成。 ANSYS Workbench是新一代的集成并行框架 式的有限元仿真軟件，它具有較高的求解精度， 可進行模態分析、靜力學分析、諧響應分析等。 下面運用ANSYS Workbench軟件對加工中心 進行模態分析。<br /> 2.1加工中心有限元建模<br /> 由于加工中心的復雜性，運用三維建模軟 件 Croe、SolidWorks, UG 建模比在 ANSYS Workbench中建模更方便、快捷。本文通過三 維建模軟件Croe建立加工中心整機模型，考慮 到模型在前期處理及后期的處理上會花費大量 時間和資源，在不影響有限元分析結果準確性 的基礎上簡化加工中心模型，如退刀槽、螺紋、 倒腳等。然后保存為x_t通用格式文件，導入 ANSYS Workbench軟件中進行預處理，采用 Automatic進行網格劃分，結合面處用彈簧阻尼 單元法[3]處理，預處理后模型如圖1所示<br /> 2.2加工中心模態分析結果<br /> 在建立好加工中心有限元模型基礎上對加 工中心采用底座施加完全約束來模擬床身采用 地腳螺栓固定形式，進行模態分析。結果如表 1所示，振型圖如圖2所示。<br /> 表1葉輪<a href='http://www.jiuzhoutongtie.cn/' target='_blank'>五軸加工中心</a>模態分析結果</p> <p> </p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 12pt;"> <td width="70" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 52.8pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">階數</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 60pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">固有頻率/Hz</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 65.5pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="70" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 52.8pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第一階</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 60pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">42.55</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 65.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿Z軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="70" valign="bottom" style="width: 52.8pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第二階</span></span><o:p></o:p></p> </td> <td width="80" valign="bottom" style="width: 60pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">46.72</span></span><o:p></o:p></p> </td> <td width="87" valign="bottom" style="width: 65.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿X軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.5pt;"> <td width="70" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 52.8pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第三階</span></span><o:p></o:p></p> </td> <td width="80" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 60pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">51.01</span></span><o:p></o:p></p> </td> <td width="87" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 65.5pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 7pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱繞Y軸扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>仿真結果顯示：影響加工中心動態特性的 主要零件是立柱，如果想提高整機的動態特性， 可以考慮抑制最低階固有頻率的振型，即對立 柱結構進行改進。下面采用對立柱布置筋板的 形式提升立柱的動態性能。<br /> 3立柱筋板布局形式對立柱動態性能 影響<br /> 對立柱的改進是在原有結構模態分析的基 礎上進行的，針對立柱較為薄弱的部分進行改 進，進而提高其本身剛度。主要改進是在原有 立柱實體中布置筋板，這樣既能減少其本身質量，又能增加其剛度，進而提高整機的固有頻 率。現在針對立柱內部筋板布局進行探究，研 究不同方式的筋板布局對立柱動態性能的影 響。對立柱筋板布局分別采用井字型筋板、米 字型筋板與X型筋板進行比較，如圖3所示。<br /> 運用ANSYS Workbench軟件對原始模型 立柱以及三種方式布置的筋板立柱進行模態分 析。結果如表2所示，振型圖如圖4所示。<br /> 表2立柱不同筋板布局模態分析結果</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="299" style="border-collapse: collapse;"> <tbody> <tr style="height: 24.85pt;"> <td width="47" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 35.25pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">階數</span></span><o:p></o:p></p> </td> <td width="40" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 29.95pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">原始</span></span><o:p></o:p></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">模型</span></span><o:p></o:p></p> </td> <td width="46" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 34.75pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">X型</span></span><o:p></o:p></p> </td> <td width="53" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 39.75pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 10.1pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">固有頻率 井字型</span></span><o:p></o:p></p> </td> <td width="44" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 33pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">米字型</span></span><o:p></o:p></p> </td> <td width="69" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 51.9pt; padding: 0cm 0.5pt; height: 24.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">振型</span></span><o:p></o:p></p> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.85pt;"> <td width="47" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 35.25pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第一階</span></span><o:p></o:p></p> </td> <td width="40" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 29.95pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">33.49</span></span><o:p></o:p></p> </td> <td width="46" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 34.75pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">42.37</span></span><o:p></o:p></p> </td> <td width="53" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 39.75pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">44.53</span></span><o:p></o:p></p> </td> <td width="44" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 33pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">48.76</span></span><o:p></o:p></p> </td> <td width="69" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 51.9pt; padding: 0cm 0.5pt; height: 11.85pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">基本無變化</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.35pt;"> <td width="47" style="width: 35.25pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第二階</span></span><o:p></o:p></p> </td> <td width="40" style="width: 29.95pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">56.62</span></span><o:p></o:p></p> </td> <td width="46" style="width: 34.75pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">66.41</span></span><o:p></o:p></p> </td> <td width="53" style="width: 39.75pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">68.87</span></span><o:p></o:p></p> </td> <td width="44" style="width: 33pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">70.36</span></span><o:p></o:p></p> </td> <td width="69" style="width: 51.9pt; padding: 0cm 0.5pt; height: 11.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 12.7pt;"> <td width="47" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 35.25pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第三階</span></span><o:p></o:p></p> </td> <td width="40" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 29.95pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">247.86</span></span><o:p></o:p></p> </td> <td width="46" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 34.75pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">256.64</span></span><o:p></o:p></p> </td> <td width="53" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 39.75pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">263.78</span></span><o:p></o:p></p> </td> <td width="44" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 33pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">266.31</span></span><o:p></o:p></p> </td> <td width="69" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 51.9pt; padding: 0cm 0.5pt; height: 12.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>仿真結果顯示：不同方式布置立柱筋板對 其振型影響較小，但是提升了立柱本身固有頻 率，尤其是對立柱布置米字型筋板，立柱本身 的固有頻率提升最大。因此，對立柱內部結構 改進選擇米字型筋板布局。<br /> 4立柱結構改進對葉輪加工中心動態 性能影響<br /> 將改進后的立柱模型替換到加工中心整機 模型中，新模型如圖5所示，并導入到ANSYS Workbench中進行模態分析。結果如表3所示。 振型圖如圖6所示。<br /> 表3立柱改進后加工中心模態分析結果</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 12pt;"> <td width="73" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 54.5pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">階數</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 63.6pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">固有頻率/Hz</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.2pt; padding: 0cm 0.5pt; height: 12pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="73" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 54.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第一階</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 63.6pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">52.95</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.2pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿Z軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="73" valign="bottom" style="width: 54.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第二階</span></span><o:p></o:p></p> </td> <td width="85" valign="bottom" style="width: 63.6pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">58.81</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="width: 67.2pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿X軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.75pt;"> <td width="73" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 54.5pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第三階</span></span><o:p></o:p></p> </td> <td width="85" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 63.6pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">63.46</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 67.2pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 9pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱繞Y軸扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>表4所示為立柱結構改進前后對銑削加工 中心動態特性影響結果的對比。<br /> 表4立柱改進前后加工中心固有頻率對比表<br /> 階數 固有頻率/Hz</p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"> <tbody> <tr style="height: 11.75pt;"> <td width="60" rowspan="2" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 45.1pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">階數</span></span><o:p></o:p></p> </td> <td width="114" colspan="2" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 85.45pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">固有頻率/Hz</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 11.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span style="font-size: 5pt;"> </span></p> </td> </tr> <tr style="height: 10.55pt;"> <td width="57" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.95pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">改進前</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.5pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">改進后</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 10.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin: 0cm 0cm 0.0001pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">振型描述</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.3pt;"> <td width="60" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 45.1pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第一階</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.95pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">42.55</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 42.5pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">52.95</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="border-top-color: windowtext; border-top-width: 1pt; border-style: solid none none; width: 67.7pt; padding: 0cm 0.5pt; height: 10.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿Z軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 10.1pt;"> <td width="60" valign="bottom" style="width: 45.1pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第二階</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="width: 42.95pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">46.72</span></span><o:p></o:p></p> </td> <td width="57" valign="bottom" style="width: 42.5pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">58.81</span></span><o:p></o:p></p> </td> <td width="90" valign="bottom" style="width: 67.7pt; padding: 0cm 0.5pt; height: 10.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8.5pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱沿X軸彎曲</span></span><o:p></o:p></p> </td> </tr> <tr style="height: 11.5pt;"> <td width="60" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 45.1pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 13pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">第三階</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 42.95pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 11pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">51.01</span></span><o:p></o:p></p> </td> <td width="57" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 42.5pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 14pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span lang="EN-US" style="font-size: 8pt;">63.46</span></span><o:p></o:p></p> </td> <td width="90" valign="top" style="border-bottom-color: windowtext; border-bottom-width: 1pt; border-style: none none solid; width: 67.7pt; padding: 0cm 0.5pt; height: 11.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; text-indent: 0cm; line-height: 8pt; background: transparent;"><span id="n1l1njb9b" class="28pt"><span style="font-size: 8pt;">立柱繞Y軸扭曲</span></span><o:p></o:p></p> </td> </tr> </tbody> </table> <p>由以上分析結果可知，將立柱結構布置米 字型筋板，雖然整機振型沒有發生太大的改變， 但是有效地提高了該加工中心整機的低階固有頻率，從而提高了加工中心的動態特性。<br /> 5結論<br /> 運用ANSYS Workbench軟件對原加工中 心進行模態分析，發現立柱是其振動薄弱環節， 影響了整機動態性能。通過對立柱布置米字型 筋板，提高了整機低階固有頻率。改變整機中 振動變形最大的零部件，是提高整機動態特性 —種有效方法，有助于滿足現代制造業對機床 加工性能的需求。</p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標簽： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： <a 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