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宋体;">引言</span></p> <p class="MsoNormal" align="left" style="text-indent: 21pt;"><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning:0pt">研制高速度、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">高精度、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">高效率和高可靠性</span><span lang="EN-US"><a href="http://www.bethel-cnc.com/" target="_blank"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">数控机床</span></a></span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">设备</span><span lang="EN-US">,</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: 宋体;mso-font-kerning:0pt">其关键性的基础和技术之一就是高性能采样伺服控制系统的设计。这类控制器的设计所面临的最大挑战就是来自系统环境和系统自身的各种不确定性的干扰。环境不确定性主要有包含在系统输入中的各种随机扰动、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">各种传感器的测量噪声</span><span lang="EN-US">;</span><span style="mso-bidi-font-size:10.5pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning:0pt">系统自身不确定性主要有系统的建模误差和系统参数的变化。分析和处理这两类不确定性的有效方法是自适应控制理论和鲁棒控制理论。用于高性能采样伺服控制系统分析与综合的鲁棒控制理论目前有</span><span lang="EN-US">Khari tonov</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">区间理论、</span><span lang="EN-US"> H] </span><span style="mso-bidi-font-size:10.5pt;font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; mso-bidi-font-family:宋体;mso-font-kerning:0pt">控制理论、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">结构起一直理论</span><span lang="EN-US">( L</span><span style="mso-bidi-font-size:10.5pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning:0pt">理论</span><span lang="EN-US">)</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">等。利用这些理论设计高性能采样伺服控制系统需要首先解决的一个最基本的共性问题就是系统鲁棒稳定性的分析。判别系统鲁棒稳定性方法主要有两种</span><span lang="EN-US">: </span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">一种是李亚普诺夫方法</span><span lang="EN-US">, </span><span style="mso-bidi-font-size:10.5pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning:0pt">是用于各类系统</span><span lang="EN-US">;</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">一种是根分布</span><span lang="EN-US">(</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: 宋体;mso-font-kerning:0pt">闭环特征多项式零点分布</span><span lang="EN-US">) </span><span style="mso-bidi-font-size:10.5pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning:0pt">判别方法</span><span lang="EN-US">,</span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">仅适用于线性非时变系统。本文把经典确定性根分布判别方法推广到不确定性情形</span><span lang="EN-US">, </span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">对</span><span lang="EN-US"><a href="http://www.bethel-cnc.com/" target="_blank"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">数控机床</span></a></span><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋体;mso-font-kerning: 0pt">设计中一类具有区间不确定性扰动的高性能采样伺服控制系统鲁棒稳定性判别问题进行了研究。获得了如下结果。</span><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体; mso-font-kerning:0pt"><o:p></o:p></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">1 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">主要结果</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">对于正系数区间多项式零点的一般估计</span><span lang="EN-US">, </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">我们有如下结论</span><span lang="EN-US">:</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">定理</span><span lang="EN-US">1:</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">给定正系数区间多项式</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042254806783.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042254949466.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042255124264.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042255547311.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042255930171.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US"><img src="/upload/images/201407/14042256111943.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">3 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">结束语</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">利用根分布判别方法</span><span lang="EN-US">, </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">对一类具有区间不确定性扰动的高性能采样伺服控制系统鲁棒稳定性判别问题进行了研究。给出了两条采样伺服控制系统保持鲁棒稳定的判别准则。并给出了数值算例。当采样伺服控制系统的闭环特征方程的系数呈区间递减性质时</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系统鲁棒稳定。这一结论适用于采样控制系统的鲁棒稳定性分析。</span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; mso-pagination:widow-orphan;mso-outline-level:1"><b><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-bidi-font-family:宋体;color:#666666;mso-font-kerning: 0pt">本文由<span lang="EN-US"> <a href="http://www.bethel-cnc.com/"><span lang="EN-US" style="color:#333333"><span lang="EN-US">伯特利数控</span></span></a></span>文章<span lang="EN-US"> </span>整理发表，文章来自网络仅参考学习，本站不承担任何法律责任。</span></b><span lang="EN-US" style="font-family: 微软雅黑;"><o:p></o:p></span></p> <p class="MsoNormal" align="center" 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<p>为了提高五轴加工中心的刀具加工精度，本文提出了五轴联动数控刀具切削加工误差非线性插补方法。根据五轴联动数控刀具工作原理，分析误差产生原因，利用误差非线性插补方法，实现误差插补。实验结果表明：利用该方法进行误差插补后，机床刀具运行轨迹与理想插补轨迹贴合度高，且插补后误差明显减小，可… <a href="/bethel/5-aix/show-2871.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>04</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心后处理器仿真与优化" href="/bethel/5-aix/show-2864.html" target="_blank">五轴加工中心后处理器仿真与优化</a></h4> <p>随着五轴联动数控加工技术的广泛应用，文中针对五轴加工中心和五轴钻攻中心的后置处理器进行仿真分析，并提出一种以序列为基础的优化方法，优化后的后置处理器，可以使得数控加工节省时间百分比得到有效提升。虽然文中提出优化方法满足了预期要求，但受到研究条件的影响，该方法未来需要进一步完善。… <a href="/bethel/5-aix/show-2864.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>04</span> <p>2024-11</p> </div> <h4><a title="立铣刀切削轨迹下五轴铣削力计算" href="/bethel/5-aix/show-2859.html" target="_blank">立铣刀切削轨迹下五轴铣削力计算</a></h4> <p>面向铣削工艺参数优选技术的工程需求，以复杂零部件多轴数控铣削为背景，文中提出了一种通用立铣刀真实切削轨迹下的五轴铣削力计算方法。 （１）建立了可同时表征球头铣刀、圆环铣刀和平底铣刀的通用立铣刀几何模型，计算得到不同类型立铣刀的切削微元长度和切削宽度。 （２）提出了一种快速求解… <a href="/bethel/5-aix/show-2859.html" target="_blank">[了解更多]</a></p> </div> <!-- 内容列表结束 --> </div> <!-- 相关文章结束 --> <!-- 页底推荐图文产品开始 --> <hr class="featurette-divider"> <!-- 页面标题开始 --> <div class="title"> <h3 class="wow bounceInDown" data-wow-delay="0.5s"><a href="/bethel/cnc">产品中心<small></small></a></h3> <span>——</span> </div> <!-- 页面标题结束 --> <div class="container"> <div class="blank30"></div> <!-- 中部开始 --> <div class="row"> <div class="col-xs-12 col-sm-3 col-md-3 col-lg-3"> <p></p> <p><a title="" href="/bethel/cnc" class="content-bottom-list-more">Learn more</a></p> </div> <div class="col-xs-12 col-sm-9 col-md-9 col-lg-9"> <div class="row"> <div class="post-masonry col-xs-12 col-sm-6 col-md-4 col-lg-4"> <a title="U260T五轴钻攻中心" href="/bethel/cnc/show_37.html" class="img-auto"> <img class="img-responsive" alt="U260T五轴钻攻中心" src="https://bethel.oss-cn-shenzhen.aliyuncs.com/U260T360360.png" 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