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面包屑導航結束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>加工中心動態特性試驗<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> <a name="bookmark54" style="line-height: 39.35pt; background-color: transparent;"><span id="n1l1njb9b" class="31pt1">5.2</span></a><span id="n1l1njb9b" class="31pt1" style="line-height: 39.35pt; background-color: transparent;">加工中心動態特性試驗</span></p> <div id="n1l1njb9b" class="Section1"> <p class="22" align="left" style="margin-bottom: 15.85pt; line-height: 39.35pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">5.2.1</span></span></st1:chsdate><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加工中心動態特性試驗研宄對象</span></span></p> <p class="22" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background:transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">本文中動態特性試驗研宄的對象仍然是前一小節介紹的由沈陽某機床有限 公司生產的動梁龍門移動式加工中心，在本章就不再詳細介紹了。</span></span></p> <!--[if !supportTextWrap]--> <!--[endif]--> <p class="22" align="left" style="margin: 15.9pt 0cm 4.9pt 33pt; text-indent: -24pt; line-height: 11.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="n1l1njb9b" class="21"><span lang="EN-US">5.2.2</span></span></st1:chsdate><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加工中心動態特性試驗目的</span></span></p> <p class="22" style="margin-top:0cm;margin-right:12.0pt;margin-bottom:0cm; margin-left:9.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">本次動態特性試驗的目的通過動態特性試驗的結果，我們可以得到該加工 中心的頻率響應，結合上一章中我們得到的模態振型，可以使我們能對加工中 心的動態特性有更加深一步的了解。從而為我們日后安全合理的使用機床提供 指導與依據<sup>[97]</sup>。</span></span></p> <p class="22" align="left" style="margin: 0cm 12pt 0.0001pt 33pt; text-indent: -24pt; line-height: 29.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="n1l1njb9b" class="21"><span lang="EN-US">5.2.3</span></span></st1:chsdate><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加工中心動態特性試驗儀器裝置與設備 此次模態參數試驗所用到的試驗設備如下表：</span></span></p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="571" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="210" align="left" style="line-height: 11pt; background: transparent;"><span id="n1l1njb9b" class="21pt">表</span><span id="n1l1njb9b" class="21pt">5. </span><span id="n1l1njb9b" class="21pt">4動態特性試驗儀器</span></p> <div align="center"> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;mso-table-layout-alt:fixed;mso-padding-alt: 0cm 0cm 0cm 0cm"> <tbody> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:25.7pt;mso-height-rule: exactly"> <td width="107" style="width: 80.4pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">編號</span></span></p> </td> <td width="280" style="width: 210pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 69pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">試驗儀器</span></span></p> </td> <td width="184" style="width: 138pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 40pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">數量</span></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:34.3pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> <td width="280" style="width: 210pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; text-indent: -26pt; line-height: 15.6pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">力錘（含力傳感器、信號傳輸電 纜及彈性沖擊墊）</span></span></p> </td> <td width="184" style="width: 138pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:2;height:21.35pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">2</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 45pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">電荷放大器</span></span><span id="n1l1njb9b" class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">SD</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-5</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">A</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:3;height:23.75pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">3</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 61pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加速度傳感器</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:4;height:22.55pt;mso-height-rule:exactly"> <td width="107" valign="top" style="width: 80.4pt; padding: 0cm; height: 22.55pt; 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 lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 39pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">(ONO</span></span><span id="n1l1njb9b" class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: SimSun;"> </span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">SOKKI</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">NP</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-3414)</span></span></p> </td> <td width="184" valign="top" style="width: 138pt; padding: 0cm; height: 22.55pt; 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 lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> </tr> <tr style="mso-yfti-irow:5;height:24.25pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">4</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 45pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">雙通道傅里葉分析儀</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:6;height:22.55pt;mso-height-rule:exactly"> <td width="107" valign="top" style="width: 80.4pt; padding: 0cm; height: 22.55pt; 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 lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 39pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">(ONO</span></span><span id="n1l1njb9b" class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: SimSun;"> </span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">SOKKI</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">CF</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">7200</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">A</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span></p> </td> <td width="184" valign="top" style="width: 138pt; padding: 0cm; height: 22.55pt; 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 lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> </tr> <tr style="mso-yfti-irow:7;mso-yfti-lastrow:yes;height:25.2pt;mso-height-rule: exactly"> <td width="107" style="width: 80.4pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">5</span></span></p> </td> <td width="280" style="width: 210pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 61pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">數據處理終端</span></span></p> </td> <td width="184" style="width: 138pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> </div> <!--[if !supportTextWrap]--> <div> </div> <p class="22" align="left" style="margin: 15.65pt 0cm 4.9pt; line-height: 11.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="n1l1njb9b" class="21"><span lang="EN-US">5.2.4</span></span></st1:chsdate><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加工中心動態特性試驗方法</span></span></p> <p class="22" style="margin-right:19.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">一般來講，模態測試試驗首先需對被測結構施加動態激勵，該激勵信號一 般由電磁激振器或力錘提供。通過對測量的激振力信號與響應信號高速采集后， 通過譜分析、脈沖響應測量及傳遞函數估計等時域或頻率信號處理方法對測量 的信號進行分析。在頻域分析中，經常采用快速傅立葉變換</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">FFT</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">將時域數據 轉換到頻域，并計算出結構的頻響函數。鑒于機床自身的結構難于與與電磁激 振器集成，故本節采用典型的瞬態激勵方法一錘擊法對測試裝置的固有頻率進 行測試<sup>[98]</sup>。錘擊法是利用集成有力傳感器的力錘敲擊被測結構，即被測結構的 輸入信號為激勵力信號，通過對測量激振力與加速度響應信號的雙通道</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">FFT</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">分 析，得到結構的傳遞函數，并通過函數擬合方法，識別出被測結構的模態參數， 利用錘擊法測量結構模態參數的原理如下圖所示。</span></span></p> <p class="22" align="left" style="text-indent: 24pt; line-height: 23.3pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">利用錘擊法做試驗，首先要確定錘擊點，根據前幾章得到的整機的模態振 型，我們確定了 3個錘擊點，即滑枕下端</span></span><span id="n1l1njb9b" class="2SimSun5"><span style="font-family: 宋體;">X</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">、</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Y</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">、</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Z</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">三個方向具體錘擊點如下圖：</span></span></p> <p class="22" style="margin-top:0cm;margin-right:0cm;margin-bottom:6.7pt; margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph;line-height: 11.5pt;mso-line-height-rule:exactly;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="n1l1njb9b" class="21"><span lang="EN-US">5.2.5</span></span></st1:chsdate><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">加工中心動態特性試驗結果分析與對比</span></span></p> <p class="22" align="right" style="margin-right:7.0pt;text-align:right;line-height: 23.3pt;mso-line-height-rule:exactly;background:transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">本次試驗采用針對同一錘點多次測量的方法，對于每一個方向</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">滑枕的</span></span><span id="n1l1njb9b" class="2SimSun5"><span style="font-family: 宋體;">X</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">、</span></span></p> <p class="22" style="margin-top:0cm;margin-right:0cm;margin-bottom:51.45pt; margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph;line-height: 23.3pt;mso-line-height-rule:exactly;background:transparent"><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Y</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">、</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Z</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">方向）兩次測量結果差異不大，我們即認為測量是準確的原則。由于傅里 葉分析儀可以輸出的圖像對于頻率的大小觀看的不是很直觀，所以我們從傅里 葉分析儀中提取了數據，并且運用</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Origin</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">軟件畫出曲線如下：</span></span><span style="font-family: 'Times New Roman'; font-size: 7pt;"> </span></p> <p class="22" style="margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">從上面模態參數圖中，我們可以看出，錘點在滑枕的三個方向上的固有頻 率相差不大，都在</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">33</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Hz</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">左右，所以我們可以認為該加工中心的固有頻率為</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">33</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Hz </span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">左右。在前面我們已經介紹過，整機在實際工作過程中外界的激振力的頻率在 </span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">35</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Hz</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-50</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">Hz</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">之間，而我們試驗的結果小于這個頻率，所以我們可以斷言，整機 在實際的工作過程中，在正常的工作條件下是不會發生共振的。有限元分析由 于有阻尼的影響以及結合面的處理可能不是很完善，所以有限元的模態分析結 果通常是會比實際情況偏小，但是有限元得出的模態振型是可信的。本章的模 態實驗主要是為了得到更為準確的模態參數，結合上一章模態分析得出的模態 振型，我們對于該加工中心的動態特性己經有了很深的了解。通過之前的模態</span></span></p> <p class="22" align="left" style="margin: 0cm 0cm 23.25pt 19pt; line-height: 23.3pt; background: transparent;"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">分析以及本章的模態實驗，我們己經得到了研宄機床靜動態特性的必備條件， 這些數據對于我們后續關于相關機床的結構優化以及本機床的安全使用都提供 了非常有用的指導和依據。</span></span></p> <p class="30" style="margin-top:0cm;margin-right:0cm;margin-bottom:15.4pt; margin-left:19.0pt;line-height:13.0pt;mso-line-height-rule:exactly;mso-pagination: lines-together;page-break-after:avoid;background:transparent"><a name="bookmark58"><span id="n1l1njb9b" class="31pt1">5.3</span></a><span id="n1l1njb9b" class="31pt1">本章小結</span></p> <p class="22" style="margin-left:19.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:23.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">本章首先運用</span></span><span id="n1l1njb9b" class="2SimSun5"><span lang="EN-US">JM</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">3815</span></span><span id="n1l1njb9b" class="2SimSun"><span style="font-size: 11.5pt;">無線靜動態應力應變儀采集了結構的應力應變數據, 一方面得到了結構在實際工作過程中的應力應變數據，另一方面驗證了有限元 仿真的準確性。其次運用傅里葉分析儀對結構進行了模態實驗得到了結構準確 的模態參數，集合上一章得到的結構的模態振型，使我們對于機床的靜態特性 有了更深一步的了解。</span></span></p> </div> <p><span style="font-size:11.0pt;font-family:"Times New Roman";mso-fareast-font-family: "Times New Roman";mso-ansi-language:#0400;mso-fareast-language:#0400; mso-bidi-language:AR-SA"><br clear="all" style="page-break-before:always; mso-break-type:section-break" /> </span></p> <p> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“龍門加工中心整機及關鍵部件靜動態特性分析與試驗研究”，因為編輯困難導致有些函數、表格、圖片、內容無法顯示，有需要者可以在網絡中查找相關文章！本文由伯特利數控整理發表文章均來自網絡僅供學習參考，轉載請注明！</span><span lang="EN-US" style="font-size:9.0pt"> <o:p></o:p></span></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=%E9%BE%99%E9%97%A8%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>龍門加工中心</a> <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> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>數控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div id="n1l1njb9b" class="blank30"></div> <!--自動調用自定義字段--> <div 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