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<li><a title="數(shù)控文章" href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導(dǎo)航結(jié)束 --> <!-- 頁面標(biāo)題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>滾珠絲杠的仿真建模<small></small></a></h3> </div> <!-- 頁面標(biāo)題結(jié)束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> <span style="font-family: 宋體; font-size: 10.5pt; letter-spacing: 0pt; line-height: 14pt; text-align: center; text-indent: 0pt;">第三章高速實(shí)心/空心滾珠絲杠熱動(dòng)態(tài)性能分析與研究</span></p> <p class="NewStyle19" style="margin: 0pt 0pt 16.25pt; text-indent: 0pt; page-break-after: avoid; line-height: 14pt;"><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">3.1</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">仿真建模及仿真的邊界條件</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin: 0pt 0pt 9.15pt; text-indent: 0pt; line-height: 11pt;"><span id="n1l1njb9b" class="17" style="font-family: 宋體; letter-spacing: -2pt; font-size: 10.5pt;">3.1.1</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">滾珠絲杠的仿真建模</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">從某種意義上講，模型是對(duì)實(shí)際系統(tǒng)的一種近似描述，當(dāng)然越精確越好，但一味 追求精確，模型就會(huì)變得特別復(fù)雜，以致沒有實(shí)際意義。如果適當(dāng)降低模型的精度要 求，忽略次要因素，模型就可以簡單些，在計(jì)算量和求解上就體現(xiàn)出優(yōu)勢。所以在建 立實(shí)際系統(tǒng)的模型時(shí)，要兼顧精確性和復(fù)雜性兩方面的因素。在建立空心/實(shí)心滾珠 絲杠仿真模型時(shí)，網(wǎng)格劃分的原則與模型假設(shè)為仿真提供了必要的前提。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">網(wǎng)格劃分的原則：一般來說，穩(wěn)態(tài)分析中網(wǎng)格上結(jié)點(diǎn)溫度比實(shí)際溫度要低。也就 是說，如果加密網(wǎng)格，溫度將增加，但加密到一定程度，結(jié)果將不顯著增加</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">(</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">也就是 說，結(jié)果收斂)。對(duì)于溫度梯度大的地方網(wǎng)格劃分應(yīng)該細(xì)分，對(duì)于溫度梯度小的地方， 網(wǎng)格劃分應(yīng)該稀疏些。當(dāng)網(wǎng)格不斷細(xì)化的過程中，仿真的結(jié)果不再變化，說明網(wǎng)格劃 分合適</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">[35]</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">仿真與理論的參數(shù)差別：溫度變化造成結(jié)構(gòu)材料的物性變化。如金屬的彈性模量、 剪切模量隨溫度的升高而減小；泊松比隨溫度變化不大。線膨脹系數(shù)大體上隨溫度的 升高而線性增加；導(dǎo)熱系數(shù)隨溫度的增加而減小；比熱容隨溫度的增加而增加。由于 滾珠絲杠上的這些參數(shù)受溫度的變化很小，故本課題在理論推導(dǎo)熱變形時(shí)忽略溫度變 化對(duì)結(jié)構(gòu)材料的物性造成的影響。然而，仿真過程中軟件會(huì)根據(jù)溫度場的變化實(shí)時(shí)更 新相關(guān)的參數(shù)。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">在處理溫度場與結(jié)構(gòu)場的耦合時(shí)，本文先求解溫度場再將溫度場的結(jié)果帶入結(jié)構(gòu) 場求解結(jié)構(gòu)熱變形。圖</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">3.1</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">是仿真的流程圖。從中可以看出在仿真過程中先進(jìn)行溫度 場的仿真，再進(jìn)行結(jié)構(gòu)場的仿真，而結(jié)構(gòu)場的結(jié)果不再影響溫度場。另外，在仿真中 無需分別對(duì)溫度場、結(jié)構(gòu)場兩次劃分網(wǎng)格。在</span><span id="n1l1njb9b" class="15" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">ANSYS/Workbench</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">中可自動(dòng)實(shí)現(xiàn)網(wǎng)格 的轉(zhuǎn)化。</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:26.7000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">結(jié)構(gòu)場控制方程中包含溫度場參數(shù)（熱應(yīng)力項(xiàng)），但是導(dǎo)熱方程中一般不包含應(yīng) 力和應(yīng)變等結(jié)構(gòu)場參數(shù)。弱耦合算法先求解導(dǎo)熱控制方程獲得溫度場，對(duì)比同一時(shí)間 步的初始和終止?fàn)顟B(tài)計(jì)算得到全部離散節(jié)點(diǎn)上的溫度增量</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">（</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">熱載荷</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">）；</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">其次根據(jù)熱載 荷和其他載荷求解結(jié)構(gòu)場控制方程獲得結(jié)構(gòu)變形、應(yīng)力和應(yīng)變。在以后每次計(jì)算過程 中，弱耦合算法首先更新導(dǎo)熱系統(tǒng)的幾何定義域（即坐標(biāo)參數(shù)</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">），</span><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;">然后順序計(jì)算導(dǎo)熱 系統(tǒng)控制方程和結(jié)構(gòu)系統(tǒng)控制方程。本文采用弱耦合即熱仿真的溫度場分布作為熱變 形結(jié)構(gòu)的熱載荷；而結(jié)構(gòu)的應(yīng)變產(chǎn)生的熱對(duì)溫度分布的影響忽略。在實(shí)際工程問題中， 這種方法比直接耦合要方便一些，因?yàn)榉治鍪褂玫氖菃螆觯挥眠M(jìn)行多次迭代計(jì)算。</span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:26.7000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "> </p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:26.7000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“空心滾珠絲杠在數(shù)控機(jī)床伺服進(jìn)給系統(tǒng)中的應(yīng)用研究”，因?yàn)榫庉嬂щy導(dǎo)致有些函數(shù)、表格、圖片、內(nèi)容無法顯示，有需要者可以在網(wǎng)絡(luò)中查找相關(guān)文章！本文由伯特利數(shù)控整理發(fā)表文章均來自網(wǎng)絡(luò)僅供學(xué)習(xí)參考，轉(zhuǎn)載請(qǐng)注明！</span></p> <p class="NewStyle20" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:26.7000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋體; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標(biāo)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> <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(shù)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' 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