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style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">高效率和高可靠性</span><span lang="EN-US"><a target="_blank"><span lang="EN-US" style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">數(shù)控機(jī)床</span></a></span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">設(shè)備</span><span lang="EN-US">,</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: 宋體;mso-font-kerning:0pt">其關(guān)鍵性的基礎(chǔ)和技術(shù)之一就是高性能采樣伺服控制系統(tǒng)的設(shè)計(jì)。這類控制器的設(shè)計(jì)所面臨的最大挑戰(zhàn)就是來自系統(tǒng)環(huán)境和系統(tǒng)自身的各種不確定性的干擾。環(huán)境不確定性主要有包含在系統(tǒng)輸入中的各種隨機(jī)擾動、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">各種傳感器的測量噪聲</span><span lang="EN-US">;</span><span style="mso-bidi-font-size:10.5pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning:0pt">系統(tǒng)自身不確定性主要有系統(tǒng)的建模誤差和系統(tǒng)參數(shù)的變化。分析和處理這兩類不確定性的有效方法是自適應(yīng)控制理論和魯棒控制理論。用于高性能采樣伺服控制系統(tǒng)分析與綜合的魯棒控制理論目前有</span><span lang="EN-US">Khari tonov</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">區(qū)間理論、</span><span lang="EN-US"> H] </span><span style="mso-bidi-font-size:10.5pt;font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; mso-bidi-font-family:宋體;mso-font-kerning:0pt">控制理論、</span> <span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">結(jié)構(gòu)起一直理論</span><span lang="EN-US">( L</span><span style="mso-bidi-font-size:10.5pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning:0pt">理論</span><span lang="EN-US">)</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">等。利用這些理論設(shè)計(jì)高性能采樣伺服控制系統(tǒng)需要首先解決的一個(gè)最基本的共性問題就是系統(tǒng)魯棒穩(wěn)定性的分析。判別系統(tǒng)魯棒穩(wěn)定性方法主要有兩種</span><span lang="EN-US">: </span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">一種是李亞普諾夫方法</span><span lang="EN-US">, </span><span style="mso-bidi-font-size:10.5pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning:0pt">是用于各類系統(tǒng)</span><span lang="EN-US">;</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">一種是根分布</span><span lang="EN-US">(</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: 宋體;mso-font-kerning:0pt">閉環(huán)特征多項(xiàng)式零點(diǎn)分布</span><span lang="EN-US">) </span><span style="mso-bidi-font-size:10.5pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning:0pt">判別方法</span><span lang="EN-US">,</span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">僅適用于線性非時(shí)變系統(tǒng)。本文把經(jīng)典確定性根分布判別方法推廣到不確定性情形</span><span lang="EN-US">, </span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">對</span><span lang="EN-US"><a target="_blank"><span lang="EN-US" style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">數(shù)控機(jī)床</span></a></span><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:宋體;mso-font-kerning: 0pt">設(shè)計(jì)中一類具有區(qū)間不確定性擾動的高性能采樣伺服控制系統(tǒng)魯棒穩(wěn)定性判別問題進(jìn)行了研究。獲得了如下結(jié)果。</span><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-bidi-font-family:宋體; 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:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">主要結(jié)果</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">對于正系數(shù)區(qū)間多項(xiàng)式零點(diǎn)的一般估計(jì)</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">我們有如下結(jié)論</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:宋體;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: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">給定正系數(shù)區(qū)間多項(xiàng)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:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">結(jié)束語</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">利用根分布判別方法</span><span lang="EN-US">, </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">對一類具有區(qū)間不確定性擾動的高性能采樣伺服控制系統(tǒng)魯棒穩(wěn)定性判別問題進(jìn)行了研究。給出了兩條采樣伺服控制系統(tǒng)保持魯棒穩(wěn)定的判別準(zhǔn)則。并給出了數(shù)值算例。當(dāng)采樣伺服控制系統(tǒng)的閉環(huán)特征方程的系數(shù)呈區(qū)間遞減性質(zhì)時(shí)</span><span lang="EN-US">,</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系統(tǒng)魯棒穩(wěn)定。這一結(jié)論適用于采樣控制系統(tǒng)的魯棒穩(wěn)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:宋體;mso-bidi-font-family:宋體;color:#666666;mso-font-kerning: 0pt">本文由<span lang="EN-US"> <a ><span lang="EN-US" style="color:#333333"><span lang="EN-US">伯特利數(shù)控</span></span></a></span>文章<span lang="EN-US"> </span>整理發(fā)表，文章來自網(wǎng)絡(luò)僅參考學(xué)習(xí)，本站不承擔(dān)任何法律責(zé)任。</span></b><span lang="EN-US" style="font-family: 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<p>本文通過對五軸加工中心的三種類型的結(jié)構(gòu)特點(diǎn)進(jìn)行具體的運(yùn)動分析，建立了數(shù)學(xué)模型推導(dǎo)出各類機(jī)床的后置處理算法。并通過UG NX進(jìn)行建模并進(jìn)行后處理與算法得到的后處理數(shù)據(jù)進(jìn)行對比，證明了文中算法的正確性。通過所推導(dǎo)的數(shù)學(xué)公式得知，坐標(biāo)的角度變換與轉(zhuǎn)臺的轉(zhuǎn)動相關(guān)。所推導(dǎo)的數(shù)學(xué)模型為最基礎(chǔ)… <a href="/bethel/5-aix/show-2877.html" target="_blank">[了解更多]</a></p> </div> <div id="tpnrxl7j" class="news-list list-border list-border-w"> <div id="tpnrxl7j" class="list-date"> <span>04</span> <p>2024-11</p> </div> <h4><a title="五軸刀具切削加工誤差非線性插補(bǔ)" href="/bethel/5-aix/show-2871.html" target="_blank">五軸刀具切削加工誤差非線性插補(bǔ)</a></h4> <p>為了提高五軸加工中心的刀具加工精度，本文提出了五軸聯(lián)動數(shù)控刀具切削加工誤差非線性插補(bǔ)方法。根據(jù)五軸聯(lián)動數(shù)控刀具工作原理，分析誤差產(chǎn)生原因，利用誤差非線性插補(bǔ)方法，實(shí)現(xiàn)誤差插補(bǔ)。實(shí)驗(yàn)結(jié)果表明：利用該方法進(jìn)行誤差插補(bǔ)后，機(jī)床刀具運(yùn)行軌跡與理想插補(bǔ)軌跡貼合度高，且插補(bǔ)后誤差明顯減小，可… <a href="/bethel/5-aix/show-2871.html" target="_blank">[了解更多]</a></p> </div> <div id="tpnrxl7j" class="news-list list-border list-border-w"> <div id="tpnrxl7j" class="list-date"> <span>04</span> <p>2024-11</p> </div> <h4><a title="五軸加工中心后處理器仿真與優(yōu)化" href="/bethel/5-aix/show-2864.html" target="_blank">五軸加工中心后處理器仿真與優(yōu)化</a></h4> <p>隨著五軸聯(lián)動數(shù)控加工技術(shù)的廣泛應(yīng)用，文中針對五軸加工中心和五軸鉆攻中心的后置處理器進(jìn)行仿真分析，并提出一種以序列為基礎(chǔ)的優(yōu)化方法，優(yōu)化后的后置處理器，可以使得數(shù)控加工節(jié)省時(shí)間百分比得到有效提升。雖然文中提出優(yōu)化方法滿足了預(yù)期要求，但受到研究條件的影響，該方法未來需要進(jìn)一步完善。… <a href="/bethel/5-aix/show-2864.html" target="_blank">[了解更多]</a></p> </div> <div id="tpnrxl7j" class="news-list list-border list-border-w"> <div id="tpnrxl7j" class="list-date"> <span>04</span> <p>2024-11</p> </div> <h4><a title="立銑刀切削軌跡下五軸銑削力計(jì)算" href="/bethel/5-aix/show-2859.html" target="_blank">立銑刀切削軌跡下五軸銑削力計(jì)算</a></h4> <p>面向銑削工藝參數(shù)優(yōu)選技術(shù)的工程需求，以復(fù)雜零部件多軸數(shù)控銑削為背景，文中提出了一種通用立銑刀真實(shí)切削軌跡下的五軸銑削力計(jì)算方法。 （１）建立了可同時(shí)表征球頭銑刀、圓環(huán)銑刀和平底銑刀的通用立銑刀幾何模型，計(jì)算得到不同類型立銑刀的切削微元長度和切削寬度。 （２）提出了一種快速求解… <a href="/bethel/5-aix/show-2859.html" target="_blank">[了解更多]</a></p> 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