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<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62b60c0023dfab40400f8ede/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">第八章 <span class="_ _0"></span> <span class="_ _0"></span><span class="ff2 sc1">SIMULIN<span class="_ _0"></span>K<span class="_ _1"> </span></span>交互式仿真集成<span class="_ _0"></span>环境</div><div class="t m0 x2 h4 y3 ff3 fs1 fc0 sc1 ls0 ws0">8.1<span class="_ _2"> </span> <span class="ff1 sc0">引导</span></div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc1 ls0 ws0">SIMULINK<span class="_"> </span><span class="ff1">是一<span class="_ _0"></span>个进行动<span class="_ _0"></span>态系统<span class="_ _0"></span>建模、<span class="_ _0"></span>仿真和<span class="_ _0"></span>综合分<span class="_ _0"></span>析的集<span class="_ _0"></span>成软件包<span class="_ _0"></span>。它<span class="_ _0"></span>可以处<span class="_ _0"></span>理的</span></div><div class="t m0 x2 h5 y5 ff1 fs2 fc0 sc1 ls0 ws0">系统包括：线性<span class="_ _0"></span>、非线性系统<span class="_ _0"></span>；离散、连续<span class="_ _0"></span>及混合系统；单<span class="_ _0"></span>任务、多任<span class="_ _0"></span>务离散事件<span class="_ _0"></span>系统。</div><div class="t m0 x3 h5 y6 ff1 fs2 fc0 sc1 ls0 ws0">在<span class="_ _3"> </span><span class="ff4">SIMULINK<span class="_ _4"></span> <span class="_ _0"></span></span>提<span class="_ _0"></span>供<span class="_ _0"></span>的<span class="_ _0"></span>图<span class="_ _0"></span>形<span class="_ _0"></span>用<span class="_ _0"></span>户<span class="_ _0"></span>界<span class="_ _0"></span>面<span class="_ _5"> </span><span class="ff4">GUI<span class="_"> </span></span>上，<span class="_ _0"></span>只<span class="_ _0"></span>要<span class="_ _0"></span>进<span class="_ _0"></span>行<span class="_ _0"></span>鼠<span class="_ _0"></span>标<span class="_ _0"></span>的<span class="_ _0"></span>简<span class="_ _0"></span>单<span class="_ _0"></span>拖<span class="_ _0"></span>拉<span class="_ _0"></span>操<span class="_ _0"></span>作<span class="_ _0"></span>就<span class="_ _0"></span>可<span class="_ _0"></span>构<span class="_ _0"></span>造</div><div class="t m0 x2 h5 y7 ff1 fs2 fc0 sc1 ls0 ws0">出复杂<span class="_ _0"></span>的仿<span class="_ _0"></span>真模<span class="_ _0"></span>型。<span class="_ _0"></span>它外<span class="_ _0"></span>表以<span class="_ _0"></span>方块<span class="_ _0"></span>图形<span class="_ _0"></span>式呈<span class="_ _0"></span>现，且<span class="_ _0"></span>采用<span class="_ _0"></span>分层<span class="_ _0"></span>结<span class="_ _0"></span>构。<span class="_ _0"></span>从建<span class="_ _0"></span>模角<span class="_ _0"></span>度讲，<span class="_ _0"></span>这<span class="_ _0"></span>既适</div><div class="t m0 x2 h5 y8 ff1 fs2 fc0 sc1 ls0 ws0">于自上而<span class="_ _0"></span>下（<span class="_ _0"></span><span class="ff4">Top-<span class="_ _0"></span>down</span>）<span class="_ _0"></span>的设计<span class="_ _0"></span>流程（概<span class="_ _0"></span>念、功<span class="_ _0"></span>能、系<span class="_ _0"></span>统、子<span class="_ _0"></span>系统、<span class="_ _0"></span>直至器<span class="_ _0"></span>件），又<span class="_ _0"></span>适于</div><div class="t m0 x2 h5 y9 ff1 fs2 fc0 sc1 ls0 ws0">自下<span class="_ _0"></span>而上<span class="_ _0"></span>（<span class="_ _0"></span><span class="ff4">Bottum-up<span class="_ _0"></span></span>）<span class="_ _0"></span><span class="ff4"> </span>逆<span class="_ _0"></span>程<span class="_ _0"></span>设计<span class="_ _0"></span>。<span class="_ _0"></span>从分<span class="_ _0"></span>析研<span class="_ _0"></span>究<span class="_ _0"></span>角度<span class="_ _0"></span>讲<span class="_ _0"></span>，这<span class="_ _0"></span>种<span class="_"> </span><span class="ff4">SIMULINK<span class="_"> </span></span>模型<span class="_ _0"></span>不仅<span class="_ _0"></span>能<span class="_ _0"></span>让用</div><div class="t m0 x2 h5 ya ff1 fs2 fc0 sc1 ls0 ws0">户知道<span class="_ _0"></span>具体<span class="_ _0"></span>环节<span class="_ _0"></span>的动<span class="_ _0"></span>态细<span class="_ _0"></span>节，<span class="_ _0"></span>而且<span class="_ _0"></span>能让<span class="_ _0"></span>用户<span class="_ _0"></span>清晰地<span class="_ _0"></span>了解<span class="_ _0"></span>各器<span class="_ _0"></span>件<span class="_ _0"></span>、各<span class="_ _0"></span>子系<span class="_ _0"></span>统、<span class="_ _0"></span>各系统<span class="_ _0"></span>间<span class="_ _0"></span>的信</div><div class="t m0 x2 h5 yb ff1 fs2 fc0 sc1 ls0 ws0">息交换，掌握各<span class="_ _0"></span>部分之间的交<span class="_ _0"></span>互影响。</div><div class="t m0 x3 h5 yc ff1 fs2 fc0 sc1 ls0 ws0">在<span class="_ _3"> </span><span class="ff4">SIM<span class="_ _6"></span>ULINK<span class="_"> </span><span class="ff1">环境中，用户<span class="_ _0"></span>将摆脱理论演<span class="_ _0"></span>绎时需做理想<span class="_ _0"></span>化假设的无<span class="_ _0"></span>奈，观察到<span class="_ _0"></span>现实世</span></span></div><div class="t m0 x2 h5 yd ff1 fs2 fc0 sc1 ls0 ws0">界中摩<span class="_ _0"></span>擦、<span class="_ _0"></span>风阻<span class="_ _0"></span>、齿<span class="_ _0"></span>隙、<span class="_ _0"></span>饱和<span class="_ _0"></span>、死<span class="_ _0"></span>区等<span class="_ _0"></span>非线<span class="_ _0"></span>性因素<span class="_ _0"></span>和各<span class="_ _0"></span>种随<span class="_ _0"></span>机<span class="_ _0"></span>因素<span class="_ _0"></span>对系<span class="_ _0"></span>统行<span class="_ _0"></span>为的影<span class="_ _0"></span>响<span class="_ _0"></span>。在</div><div class="t m0 x2 h5 ye ff4 fs2 fc0 sc1 ls0 ws0">SIMULINK<span class="_"> </span><span class="ff1">环境中<span class="_ _0"></span>，用户可<span class="_ _0"></span>以在仿<span class="_ _0"></span>真进程<span class="_ _0"></span>中改变<span class="_ _0"></span>感兴趣<span class="_ _0"></span>的参数<span class="_ _0"></span>，实时<span class="_ _0"></span>地观察<span class="_ _0"></span>系统行<span class="_ _0"></span>为的<span class="_ _0"></span>变</span></div><div class="t m0 x2 h5 yf ff1 fs2 fc0 sc1 ls0 ws0">化。由于<span class="_ _3"> </span><span class="ff4">SIMULINK<span class="_"> </span></span>环境使用户摆脱了<span class="_ _0"></span>深奥数学推演<span class="_ _0"></span>的压力和烦琐<span class="_ _0"></span>编程的困扰<span class="_ _0"></span>，因此用户</div><div class="t m0 x2 h5 y10 ff1 fs2 fc0 sc1 ls0 ws0">在此环境中会产<span class="_ _0"></span>生浓厚的探索<span class="_ _0"></span>兴趣，引发活<span class="_ _0"></span>跃的思维，感悟<span class="_ _0"></span>出新的真谛<span class="_ _0"></span>。</div><div class="t m0 x3 h5 y11 ff1 fs2 fc0 sc1 ls0 ws0">在<span class="_ _3"> </span><span class="ff4">MATLAB6.x<span class="_"> </span></span>版中，可直接<span class="_ _0"></span>在<span class="_ _3"> </span><span class="ff4">SIMULINK<span class="_"> </span></span>环境中<span class="_ _0"></span>运作的<span class="_ _0"></span>工具包<span class="_ _0"></span>很多，<span class="_ _0"></span>已覆盖通<span class="_ _0"></span>信、</div><div class="t m0 x2 h5 y12 ff1 fs2 fc0 sc1 ls0 ws0">控制<span class="_ _0"></span>、信<span class="_ _0"></span>号<span class="_ _0"></span>处理<span class="_ _0"></span>、<span class="_ _0"></span><span class="ff4">DSP<span class="_ _0"></span></span>、电<span class="_ _0"></span>力系<span class="_ _0"></span>统<span class="_ _0"></span>等诸<span class="_ _0"></span>多<span class="_ _0"></span>领域<span class="_ _0"></span>，所<span class="_ _0"></span>涉<span class="_ _0"></span>内容<span class="_ _0"></span>专<span class="_ _0"></span>业性<span class="_ _0"></span>极<span class="_ _0"></span>强。<span class="_ _0"></span>本书<span class="_ _0"></span>无<span class="_ _0"></span>意论<span class="_ _0"></span>述<span class="_ _0"></span>涉<span class="_ _0"></span>及</div><div class="t m0 x2 h5 y13 ff1 fs2 fc0 sc1 ls0 ws0">工具包的专业内<span class="_ _0"></span>容，而只是集<span class="_ _0"></span>中阐述：<span class="_ _0"></span><span class="ff4">SIMULINK<span class="_ _0"></span> <span class="_ _0"></span></span>的基本使用<span class="_ _0"></span>技法和<span class="ff5">相关</span>的<span class="_ _0"></span>数<span class="ff5">值考虑</span>。</div><div class="t m0 x3 h5 y14 ff1 fs2 fc0 sc1 ls0 ws0">节<span class="_ _3"> </span><span class="ff4">8.1<span class="_ _7"> </span><span class="ff5">虽</span></span>是专为<span class="_ _3"> </span><span class="ff4">SIMULINK<span class="_"> </span><span class="ff5">初</span></span>学<span class="ff5">者写</span>的<span class="_ _0"></span>，<span class="ff5">但即便</span>是<span class="ff5">熟<span class="_ _0"></span>悉<span class="_ _3"> </span><span class="ff4">SIMUL<span class="_ _0"></span>INK<span class="_"> </span></span></span>以<span class="ff5">前</span>版本的<span class="ff5">读者也</span></div><div class="t m0 x2 h5 y15 ff5 fs2 fc0 sc1 ls0 ws0">值得快<span class="_ _0"></span>速浏<span class="_ _0"></span>览<span class="ff1">这<span class="_ _0"></span>部分<span class="_ _0"></span>内容<span class="_ _0"></span>，因<span class="_ _0"></span>为新<span class="_ _0"></span>版的<span class="_ _0"></span>界面<span class="_ _0"></span>、</span>菜<span class="_ _0"></span><span class="ff1">单<span class="_ _0"></span>、工<span class="_ _0"></span>具</span>条<span class="_ _0"></span><span class="ff1">、模<span class="_ _0"></span>块</span>库<span class="_ _0"></span>都有<span class="_ _0"></span>较大<span class="_ _0"></span><span class="ff1">的变<span class="_ _0"></span>化<span class="_ _0"></span>。第</span></div><div class="t m0 x2 h5 y16 ff4 fs2 fc0 sc1 ls0 ws0">8.2<span class="_"> </span><span class="ff1">节<span class="ff5">比<span class="_ _0"></span>较<span class="_ _0"></span>详<span class="_ _0"></span></span>细<span class="_ _0"></span>地<span class="_ _0"></span>阐<span class="_ _0"></span>述<span class="_ _0"></span>建<span class="_ _0"></span>模<span class="_ _0"></span>的<span class="_ _0"></span>基<span class="_ _0"></span>本<span class="_ _0"></span>操<span class="_ _0"></span>作<span class="_ _0"></span>：<span class="_ _0"></span>通<span class="_ _0"></span>用<span class="_ _0"></span>模<span class="_ _0"></span>块<span class="_ _0"></span>的<span class="_ _0"></span>具<span class="_ _0"></span>体<span class="_ _0"></span>化<span class="_ _0"></span>设<span class="_ _0"></span><span class="ff5">置<span class="_ _0"></span></span>、<span class="_ _0"></span>信<span class="_ _0"></span>号<span class="_ _0"></span>线<span class="_ _0"></span><span class="ff5">勾<span class="_ _0"></span>画<span class="_ _0"></span></span>、<span class="_ _0"></span>标<span class="_ _0"></span><span class="ff5">识<span class="_ _0"></span></span>、<span class="_ _0"></span>模</span></div><div class="t m0 x2 h5 y17 ff1 fs2 fc0 sc1 ls0 ws0">型<span class="_ _8"></span><span class="ff5">窗<span class="_ _8"></span></span>参<span class="_ _8"></span>数<span class="_ _9"> </span>设<span class="_ _8"></span><span class="ff5">置<span class="_ _8"></span></span>。<span class="_ _9"> </span>这<span class="_ _8"></span>部<span class="_ _8"></span>分<span class="_ _9"> </span>内<span class="_ _8"></span>容<span class="_ _8"></span>是<span class="_ _9"> </span>进<span class="_ _8"></span>一<span class="_ _9"> </span><span class="ff5">步<span class="_ _8"></span></span>深<span class="_ _8"></span><span class="ff5">入<span class="_ _9"> </span></span>的<span class="_ _8"></span><span class="ff5">前<span class="_ _9"> </span></span>提<span class="_ _8"></span>。<span class="_ _9"> </span>从<span class="_ _8"></span>第<span class="_ _a"> </span><span class="ff4">8.3<span class="_ _b"> </span></span>节<span class="_ _8"></span><span class="ff5">起<span class="_ _8"></span></span>，<span class="_ _9"> </span>由<span class="_ _8"></span><span class="ff5">浅<span class="_ _8"></span>入<span class="_ _9"> </span></span>深<span class="_ _8"></span>地<span class="_ _8"></span>讲<span class="_ _9"> </span>述</div><div class="t m0 x2 h5 y18 ff4 fs2 fc0 sc1 ls0 ws0">SIMULINK<span class="_"> </span><span class="ff1">对各种数学、工程<span class="_ _0"></span><span class="ff5">问题</span>的建<span class="_ _0"></span>模、仿真和分析的<span class="_ _0"></span>基本方法。</span></div><div class="t m0 x3 h5 y19 ff1 fs2 fc0 sc1 ls0 ws0">本章采<span class="_ _0"></span>用<span class="ff5">“算<span class="_ _0"></span>例”</span>作<span class="_ _0"></span>为<span class="ff5">主</span>体<span class="_ _0"></span>，<span class="ff5">配</span>以<span class="_ _0"></span>适<span class="ff5">量</span>的<span class="_ _0"></span><span class="ff5">归纳<span class="_ _0"></span></span>性表述<span class="_ _0"></span>。本章<span class="_ _0"></span>包<span class="ff5">含</span>了<span class="_"> </span><span class="ff4">34<span class="_ _3"> </span></span>个<span class="ff5">“尽量</span>简<span class="_ _0"></span>单<span class="ff5">”</span>又<span class="_ _0"></span><span class="ff5">“独</span></div><div class="t m0 x2 h5 y1a ff5 fs2 fc0 sc1 ls0 ws0">立完整”<span class="ff1">的</span>“典<span class="_ _0"></span><span class="ff1">型</span>”算例<span class="ff1">，<span class="_ _0"></span>而这</span>正<span class="ff1">是<span class="_"> </span><span class="ff4">SIMULINK<span class="_"> </span></span>在线<span class="_ _3"> </span><span class="ff4">PDF<span class="_ _7"> </span></span></span>文<span class="ff1">件之所</span>缺<span class="ff1">。</span>读<span class="_ _0"></span>者<span class="ff1">通</span>过“手<span class="_ _0"></span><span class="ff1">、</span>眼<span class="ff1">、</span>脑”</div><div class="t m0 x2 h5 y1b ff5 fs2 fc0 sc1 ls0 ws0">并<span class="ff1">用地</span>练习算例<span class="_ _0"></span><span class="ff1">，掌握<span class="_ _3"> </span><span class="ff4">SIMULINK<span class="_"> </span></span>的一</span>般<span class="ff1">使用</span>规<span class="_ _0"></span>则<span class="ff1">和操作技法。</span></div><div class="t m0 x3 h5 y1c ff5 fs2 fc0 sc1 ls0 ws0">鉴<span class="ff1">于<span class="_ _7"> </span><span class="ff4">SIMUL<span class="_ _0"></span>INK<span class="_"> </span></span>的本</span>质<span class="ff1">，本节</span>算<span class="_ _0"></span>例必定<span class="ff1">涉及数<span class="_ _0"></span>学、</span>物<span class="ff1">理、和<span class="_ _0"></span></span>若干<span class="ff1">工程</span>考<span class="_ _0"></span>虑<span class="ff1">。本书已<span class="_ _0"></span>采</span></div><div class="t m0 x2 h5 y1d ff5 fs2 fc0 sc1 ls0 ws0">取“<span class="_ _0"></span><span class="ff1">无<span class="_ _0"></span></span>量<span class="_ _0"></span>纲<span class="_ _0"></span>记<span class="_ _0"></span><span class="ff1">述<span class="_ _0"></span></span>”<span class="_ _0"></span><span class="ff1">、<span class="_ _0"></span></span>“<span class="_ _4"></span>注释<span class="_ _0"></span>”<span class="_ _4"></span><span class="ff1">等</span>措<span class="_ _0"></span>施<span class="_ _4"></span><span class="ff1">使</span>算<span class="_ _0"></span>例<span class="_ _0"></span>尽<span class="_ _0"></span><span class="ff1">可<span class="_ _0"></span>能<span class="_ _0"></span></span>易<span class="_ _0"></span>读<span class="_ _0"></span>易<span class="_ _0"></span>懂<span class="_ _4"></span><span class="ff1">，</span>读<span class="_ _0"></span>者<span class="_ _0"></span><span class="ff1">只<span class="_ _0"></span>要<span class="_ _0"></span></span>稍<span class="_ _0"></span>微<span class="_ _0"></span>耐<span class="_ _0"></span>心<span class="_ _0"></span><span class="ff1">，<span class="_ _0"></span>就<span class="_ _0"></span>可<span class="_ _0"></span>以<span class="_ _0"></span>从<span class="_ _0"></span>这</span></div><div class="t m0 x2 h5 y1e ff5 fs2 fc0 sc1 ls0 ws0">些<span class="_ _8"></span>有<span class="_ _4"></span>背<span class="_ _8"></span>景<span class="_ _8"></span><span class="ff1">的<span class="_ _8"></span>内<span class="_ _8"></span>容<span class="_ _8"></span>体<span class="_ _8"></span></span>验<span class="_ _8"></span><span class="ff1">到<span class="_ _a"> </span><span class="ff4">SIMULINK<span class="_ _b"> </span></span>仿<span class="_ _8"></span>真<span class="_ _8"></span>之<span class="_ _8"></span>细<span class="_ _8"></span></span>腻<span class="_ _8"></span><span class="ff1">和<span class="_ _8"></span></span>切<span class="_ _4"></span><span class="ff1">实<span class="_ _8"></span>，<span class="_ _8"></span>从<span class="_ _8"></span>这<span class="_ _8"></span></span>些<span class="_ _8"></span>带<span class="_ _4"></span>背<span class="_ _8"></span>景<span class="_ _8"></span><span class="ff1">性<span class="_ _8"></span>的<span class="_ _8"></span></span>算<span class="_ _8"></span>例<span class="_ _8"></span>品<span class="_ _8"></span><span class="ff1">出</span></div><div class="t m0 x2 h5 y1f ff4 fs2 fc0 sc1 ls0 ws0">SIMULINK<span class="_"> </span><span class="ff1">的<span class="ff5">精妙</span>之处。</span></div><div class="t m0 x3 h5 y20 ff1 fs2 fc0 sc1 ls0 ws0">本章内容已在<span class="_ _3"> </span><span class="ff4">MA<span class="_ _0"></span>TLAB<span class="_ _0"></span>6.5<span class="_ _7"> </span></span>基<span class="ff5">础</span>上<span class="_ _0"></span>进行<span class="ff5">全</span>面<span class="ff5">更</span>新<span class="_ _0"></span>，变动<span class="ff5">最大</span>的<span class="_ _0"></span>是第<span class="_ _5"> </span><span class="ff4">8.4.3<span class="_ _3"> </span></span>节。此外，为</div><div class="t m0 x2 h5 y21 ff1 fs2 fc0 sc1 ls0 ws0">适<span class="ff5">应读者应</span>用<span class="ff5">水<span class="_ _0"></span>平</span>的提<span class="ff5">高</span>，新<span class="_ _0"></span><span class="ff5">增</span>了第<span class="_ _3"> </span><span class="ff4">8.8<span class="_ _7"> </span></span>节，<span class="_ _0"></span>论述<span class="_ _3"> </span><span class="ff4">S<span class="_ _7"> </span><span class="ff5">函</span></span>数模块的<span class="ff5">创</span>建和<span class="_ _0"></span>使用。</div><div class="t m0 x2 h6 y22 ff3 fs3 fc0 sc1 ls0 ws0">8.1.1<span class="_ _c"> </span>SIMULINK<span class="_ _5"> </span><span class="ff1 sc0">的<span class="ff5">安装</span></span></div></div><div class="t m0 x4 h7 y23 ff4 fs4 fc0 sc1 ls0 ws0">1</div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>
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数学建模Matlab教案
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数值数组（Numeric Array）和数组运算（Array Operations）始终是MATLAB的核心内容。自MATLAB5.x版起，由于其“面向对象”的特征，这种数值数组（以下简称为数组）成为了MATALB最重要的一种内建数据类型（Built-in Data Type），而数组运算就是定义在这种数据结构上的方法（Method）。
本章系统阐述：一、二维数值数组的创建、寻访；数组运算和矩阵运算的区别；实现数组运算的基本函数；多项式的表达、创建和操作；常用标准数组生成函数和数组构作技法；高维数组的创建、寻访和操作；非数NaN、“空”数组概念和应用；关系和逻辑操作。
顺便指出：（1）本章所涉内容和方法，不仅使用于数值数组，而且也将部分地延伸使用于在其他数据结构中。（2）MATLAB5.x和6.x 版在本章内容上的差异极微。（3）MATLAB6.5版新增的两种逻辑操作，在第2.13.2节给予介绍。
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