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href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導航結(jié)束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>電磁懸浮系統(tǒng)的控制策略<small></small></a></h3> </div> <!-- 頁面標題結(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> <a name="bookmark3" style="line-height: 13pt; background-color: transparent;"><span id="n1l1njb9b" class="20"><span style="font-family: SimSun;">1.3</span></span></a><span id="n1l1njb9b" class="20" style="line-height: 13pt; background-color: transparent;">電磁懸浮系統(tǒng)的控制策略</span></p> <p class="21" style="margin-top:0cm;text-align:justify;text-justify:inter-ideograph; text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span id="n1l1njb9b" class="2">隨著科學技術理論的不斷發(fā)展，各種控制算法相繼被人們研發(fā)出來，這為電磁懸 浮系統(tǒng)的控制器設計提供了大量參考依據(jù)。從傳統(tǒng)的線性控制算法到先進智能的非線 性控制算法控制理論得到了長足的發(fā)展。由于電磁懸浮系統(tǒng)是典型的非線性系統(tǒng)，因 此線性的控制算法只能在懸浮系統(tǒng)進行了線性化處理后才能使用。利用泰勒級數(shù)在平 衡點附近對非線性函數(shù)進行展開和反饋線性化是當今比較成熟的線性化方法。由于線 性化處理后的非線性系統(tǒng)降低了控制難度，因此也降低了控制器設計的難度。原系統(tǒng) 的高階響應在線性化后被忽略了。工程實踐中如果采用線性的控制算法會出現(xiàn)一定的 偏差從而不能滿足系統(tǒng)的性能指標。非線性控制算法則不需要精確地知道被控系統(tǒng)的 數(shù)學模型，不需要忽略系統(tǒng)非線性高階響應項。由于非線性控制可以真實的反應系統(tǒng) 的輸出效果，所以具有很好的工程實踐意義，得到了社會的廣泛關注。現(xiàn)如今非線性 控制多指先進智能控制如模糊控制、無源控制、神經(jīng)網(wǎng)絡、自抗擾控制、自適應控制、 滑模變結(jié)構控制和魯棒控制等。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule: exactly;mso-list:l0 level1 lfo1;tab-stops:45.9pt;background:transparent"><!--[if !supportLists]--><span style="font-family: SimSun;">(1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="n1l1njb9b" class="2">模糊控制：模糊控制實質(zhì)就是將工程師的常年積累的實踐經(jīng)驗用模糊集理 論、模糊語言變量及模糊邏輯推理來表達出來，模糊控制不依賴被控對象的精確數(shù)學 模型，用計算機就可以實現(xiàn)工程師的實踐經(jīng)驗。模糊控制算法是由模糊語言、模糊規(guī) 則和模糊隸屬度構成的。用通俗易懂的語言模式直接將人類歸納出來的經(jīng)驗、判斷、 思維過程表述出來，其簡潔明了的形式逐漸得到廣泛的認可<sup>[13]</sup>。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule: exactly;mso-list:l0 level1 lfo1;tab-stops:45.65pt;background:transparent"><!--[if !supportLists]--><span style="font-family: SimSun;">(2)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="n1l1njb9b" class="2">神經(jīng)網(wǎng)絡控制<sub>：</sub>神經(jīng)網(wǎng)絡是一個動態(tài)的系統(tǒng)，它模仿了人類大腦中的神經(jīng)結(jié) 構，它對輸入響應數(shù)據(jù)的處理采用的是連續(xù)或斷續(xù)方式。神經(jīng)網(wǎng)絡系統(tǒng)是由許多簡單 的神經(jīng)元構成的，它們相互緊密地聯(lián)系在一起從而構成了錯綜復雜網(wǎng)絡系統(tǒng)。雖然單 一的神經(jīng)元結(jié)構不是很復雜而且功能也可能很簡單，但是由大量的神經(jīng)元構造出來的 神經(jīng)網(wǎng)絡系統(tǒng)具備了多姿多彩的復雜行為活動。神經(jīng)網(wǎng)絡系統(tǒng)是非線性且復雜程度相 當高的動力系統(tǒng)，不僅擁有非線性系統(tǒng)的共性，更具備了其特有的功能。例如自學習、 自組織和自適應能力，以及每個神經(jīng)元單元之間的互相連接性和高度維合性等<sup>[14]</sup>。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule: exactly;mso-list:l0 level1 lfo1;background:transparent"><!--[if !supportLists]--><span style="font-family: SimSun;">(3)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="n1l1njb9b" class="2">滑模變結(jié)構控制：滑模控制是一種能夠很好地提高系統(tǒng)魯棒性的控制算法， 這一控制算法的特點是不連續(xù)，結(jié)構變化，根據(jù)情況改變控制器輸出。它適用于有參 數(shù)攝動、存在建模誤差以及干擾抑制的線性或非線性被控對象。首先狀態(tài)變量被帶到 滑模切換面上去，然后沿著該滑模面趨向于原點，如果有擾動存在則狀態(tài)變量就會在 滑模面上呈現(xiàn)出之字形切換，也就是抖動。滑模控制的抗千擾性主要體現(xiàn)在將不確定 擾動束縛在滑模的邊界層內(nèi)<sup>[15]</sup>。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule: exactly;mso-list:l0 level1 lfo1;background:transparent"> </p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:27.0pt;line-height:23.3pt;mso-line-height-rule: exactly;mso-list:l0 level1 lfo1;background:transparent"> </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“數(shù)控加工中心龍門磁懸浮系統(tǒng)耦合分析及控制研究”，因為編輯困難導致有些函數(shù)、表格、圖片、內(nèi)容無法顯示，有需要者可以在網(wǎng)絡中查找相關文章！本文由伯特利數(shù)控整理發(fā)表文章均來自網(wǎng)絡僅供學習參考，轉(zhuǎn)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 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