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<article id="post-turtlesim-draw-a-triangle" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2020/07/14/turtlesim-draw-a-triangle/">turtlesim draw a triangle</a>
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<h1 id="ROS-入门Turtlesim-–draw-a-triangle"><a href="#ROS-入门Turtlesim-–draw-a-triangle" class="headerlink" title="ROS 入门Turtlesim –draw a triangle"></a>ROS 入门Turtlesim –draw a triangle</h1><h2 id="创建工作区"><a href="#创建工作区" class="headerlink" title="创建工作区"></a>创建工作区</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">mkdir -p ~/catkin_clicbot/src</span><br><span class="line">catkin build <span class="comment">#确认安装了catkin_tools</span></span><br></pre></td></tr></table></figure>
<p>添加工作区路径</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cd</span> ~</span><br><span class="line">vim .bashrc</span><br><span class="line"><span class="comment"># 在最后添加</span></span><br><span class="line"><span class="built_in">source</span> ~/catkin_clicbot/devel/setup.bash</span><br></pre></td></tr></table></figure>
<h2 id="创建程序包"><a href="#创建程序包" class="headerlink" title="创建程序包"></a>创建程序包</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cd ~/catkin_clicbot/src</span><br><span class="line">catkin_create_pkg turtle_control rospy</span><br></pre></td></tr></table></figure>
<p>这里我们顺便把这个包用git管理起来并链接到GitHub</p>
<h2 id="创建一个node"><a href="#创建一个node" class="headerlink" title="创建一个node"></a>创建一个node</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">vim turtle_triangle.py</span><br><span class="line"><span class="comment"># copy code from my github:https://github.com/Wangxinhui-bot/TurtleControl</span></span><br><span class="line">chmod +x turtle_triangle.py</span><br><span class="line"><span class="built_in">cd</span> ~/catkin_clicbot/src</span><br><span class="line">catkin build</span><br><span class="line"><span class="built_in">source</span> ~/catkin_clicbot/devel/setup.bash</span><br></pre></td></tr></table></figure>
<h2 id="测试"><a href="#测试" class="headerlink" title="测试"></a>测试</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">roscore</span><br><span class="line">rosrun turtlesim turtlesim_node <span class="comment">#in new terminal</span></span><br><span class="line">rosrun turtle_control turle_triangle.py <span class="comment">#in new terminal</span></span><br></pre></td></tr></table></figure>
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<a class="article-more-a" href="/2020/07/14/turtlesim-draw-a-triangle/">展开全文 >></a>
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<article id="post-机械系统传动零件设计" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2020/07/07/%E6%9C%BA%E6%A2%B0%E7%B3%BB%E7%BB%9F%E4%BC%A0%E5%8A%A8%E9%9B%B6%E4%BB%B6%E8%AE%BE%E8%AE%A1/">机械系统传动零件设计</a>
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<time datetime="2020-07-07T10:06:19.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-07-07</time>
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<h1 id="机械系统传动零件设计"><a href="#机械系统传动零件设计" class="headerlink" title="机械系统传动零件设计"></a>机械系统传动零件设计</h1><h2 id="2-1-传动总论及机械传动方案的设计"><a href="#2-1-传动总论及机械传动方案的设计" class="headerlink" title="2.1 传动总论及机械传动方案的设计"></a>2.1 传动总论及机械传动方案的设计</h2><h3 id="2-1-1-传动系统功用和类型"><a href="#2-1-1-传动系统功用和类型" class="headerlink" title="2.1.1 传动系统功用和类型"></a>2.1.1 传动系统功用和类型</h3><p>功能：</p>
<blockquote>
<p>传递动力</p>
<p>传递运动</p>
<p>分配运动和动力</p>
</blockquote>
<h3 id="2-1-2-机械传动设计一般原则"><a href="#2-1-2-机械传动设计一般原则" class="headerlink" title="2.1.2 机械传动设计一般原则"></a>2.1.2 机械传动设计一般原则</h3><h4 id="1-功率"><a href="#1-功率" class="headerlink" title="1.功率"></a>1.功率</h4><p>传动功率和效率排行</p>
<p>齿轮>涡轮>链传动>带传动>螺旋传动</p>
<p>蜗杆传动易发热功率不宜过大</p>
<h4 id="2-外形尺寸和质量"><a href="#2-外形尺寸和质量" class="headerlink" title="2.外形尺寸和质量"></a>2.外形尺寸和质量</h4><p>中心距</p>
<p>传动比小时蜗杆尺寸和质量小</p>
<p>传动比大可以用齿轮，如行星齿轮、谐波齿轮等</p>
<h3 id="3-安全要求和经济要求"><a href="#3-安全要求和经济要求" class="headerlink" title="3.安全要求和经济要求"></a>3.安全要求和经济要求</h3><p>传动链尽可能简单，简短，合理的使用寿命</p>
<h3 id="2-1-3机械传动系统的运动和动力学计算"><a href="#2-1-3机械传动系统的运动和动力学计算" class="headerlink" title="2.1.3机械传动系统的运动和动力学计算"></a>2.1.3机械传动系统的运动和动力学计算</h3><h4 id="转速和圆周速度"><a href="#转速和圆周速度" class="headerlink" title="转速和圆周速度"></a>转速和圆周速度</h4><p>$v = \frac{\pi{dn}}{60\times{1000}}$</p>
<h4 id="传动比"><a href="#传动比" class="headerlink" title="传动比"></a>传动比</h4><p>$i =\frac{n_1}{n_2}$</p>
<p>输入转速比输出转速</p>
<h4 id="功率"><a href="#功率" class="headerlink" title="功率"></a>功率</h4><p>$P_o = \frac{Fv}{1000}$</p>
<p>$P_o = \frac{Tn}{9.55\times{10^6}}$</p>
<h4 id="机械效率"><a href="#机械效率" class="headerlink" title="机械效率"></a>机械效率</h4><p>$\eta = \frac{P_o}{P_i}\times{100%}$</p>
<h3 id="习题内容"><a href="#习题内容" class="headerlink" title="习题内容"></a>习题内容</h3><p>主要是计算总体的机械效率、总传动比、某一轴上转矩</p>
<h2 id="2-2-V带传动设计"><a href="#2-2-V带传动设计" class="headerlink" title="2.2 V带传动设计"></a>2.2 V带传动设计</h2><h3 id="2-2-1-V带传动主要几何尺寸及国家标准"><a href="#2-2-1-V带传动主要几何尺寸及国家标准" class="headerlink" title="2.2.1 V带传动主要几何尺寸及国家标准"></a>2.2.1 V带传动主要几何尺寸及国家标准</h3><h4 id="截面尺寸"><a href="#截面尺寸" class="headerlink" title="截面尺寸"></a>截面尺寸</h4><p>Y、Z、A、B、C、D、E，带楔角40°</p>
<h4 id="带轮基准直径"><a href="#带轮基准直径" class="headerlink" title="带轮基准直径"></a>带轮基准直径</h4><p>$i = \frac{d_d2}{d_d1}$</p>
<h4 id="V带基准长度"><a href="#V带基准长度" class="headerlink" title="V带基准长度"></a>V带基准长度</h4><p>带长修正系数</p>
<h4 id="中心距和包角"><a href="#中心距和包角" class="headerlink" title="中心距和包角"></a>中心距和包角</h4><p>一般要求包角大于120°</p>
<h3 id="2-2-2-V带传动的工作原理"><a href="#2-2-2-V带传动的工作原理" class="headerlink" title="2.2.2 V带传动的工作原理"></a>2.2.2 V带传动的工作原理</h3><h4 id="带上的力"><a href="#带上的力" class="headerlink" title="带上的力"></a>带上的力</h4><p>$ F_e = F_1 -F_2$</p>
<p>$ 2F_0 = F_1 +F_2$</p>
<p>$ P = \frac{F_ev}{1000}$</p>
<p>$F_0$为初拉力</p>
<h4 id="弹性滑动和打滑"><a href="#弹性滑动和打滑" class="headerlink" title="弹性滑动和打滑"></a>弹性滑动和打滑</h4><p>弹性滑动影响</p>
<blockquote>
<p>带传动圆周速度损失</p>
<p>降低传动效率</p>
<p>引起温升和磨损，降低寿命</p>
</blockquote>
<p>打滑</p>
<p>微元分析可得$F_{emax} =F_1(1-\frac{1}{e^{f\alpha}})$</p>
<h4 id="应力和失效"><a href="#应力和失效" class="headerlink" title="应力和失效"></a>应力和失效</h4><p>疲劳断裂和磨损打滑</p>
<h3 id="2-2-3-单根V带的额定功率"><a href="#2-2-3-单根V带的额定功率" class="headerlink" title="2.2.3 单根V带的额定功率"></a>2.2.3 单根V带的额定功率</h3><p>$[\sigma]^mN = C$</p>
<p>$N=\frac{3600vz_pt}{L_d} z_p带轮数一般取2;t使用寿命，h$</p>
<p>$P_0 = \frac{F_{emax}v}{1000}$</p>
<p>$额定功率P_r = (P_0+\Delta{P_0})K_\alpha{K_L}$</p>
<p>$z = \frac{P_ca}{P_r} = \frac{K_AP_ca}{P_r}$</p>
<h3 id="2-2-4-设计举例"><a href="#2-2-4-设计举例" class="headerlink" title="2.2.4 设计举例"></a>2.2.4 设计举例</h3><p>主要参考p43 例2-2</p>
<h3 id="2-2-5-张紧装置"><a href="#2-2-5-张紧装置" class="headerlink" title="2.2.5 张紧装置"></a>2.2.5 张紧装置</h3><h2 id="2-3链传动设计"><a href="#2-3链传动设计" class="headerlink" title="2.3链传动设计"></a>2.3链传动设计</h2><h3 id="2-3-1传动链与链轮"><a href="#2-3-1传动链与链轮" class="headerlink" title="2.3.1传动链与链轮"></a>2.3.1传动链与链轮</h3><p>结构特性尺寸：</p>
<blockquote>
<p>链的节距，p越大，链尺寸和传递能力越高</p>
<p>链节数，取偶数便于连接</p>
</blockquote>
<h3 id="2-3-3链传动设计"><a href="#2-3-3链传动设计" class="headerlink" title="2.3.3链传动设计"></a>2.3.3链传动设计</h3><p><strong>受力分析：</strong></p>
<p>紧边拉力： $F_1 = F_e + F_c +F_f$</p>
<p>松边拉力：$F_2 = F_c +F_f$</p>
<p>Fe是工作拉力，Fc是离心拉力，Ff垂度拉力</p>
<p><strong>失效形式：</strong></p>
<blockquote>
<p>链的疲劳破坏:交变应力进过一定循环次数后出现点蚀，所以疲劳强度是承载能力的关键</p>
<p>铰链磨损：</p>
<p>链条胶合</p>
<p>静力破坏</p>
</blockquote>
<p><strong>极限功率：</strong></p>
<p><strong>链传动的额定功率曲线：</strong></p>
<p>$P_{ca} = K_AP\leq K_zK_pP_0$</p>
<p>$K_A工作情况系数、K_Z小链轮齿数系数、K_p多排链的排数系数$</p>
<p><strong>链传动的润滑设计：</strong></p>
<h3 id="2-3-4滚子链传动设计举例"><a href="#2-3-4滚子链传动设计举例" class="headerlink" title="2.3.4滚子链传动设计举例"></a>2.3.4滚子链传动设计举例</h3><p>教材p54</p>
<h3 id="2-3-5链传动的张紧"><a href="#2-3-5链传动的张紧" class="headerlink" title="2.3.5链传动的张紧"></a>2.3.5链传动的张紧</h3><h2 id="2-4-齿轮传动设计"><a href="#2-4-齿轮传动设计" class="headerlink" title="2.4 齿轮传动设计"></a>2.4 齿轮传动设计</h2><h3 id="2-4-1-齿轮传动的受力分析"><a href="#2-4-1-齿轮传动的受力分析" class="headerlink" title="2.4.1 齿轮传动的受力分析"></a>2.4.1 齿轮传动的受力分析</h3><p>$T_{ca} = KT =K_AK_vK_{\alpha}K_{\beta}T$</p>
<p>几个K分别表示使用系数、动载系数、载荷分配系数、齿向载荷分配系数</p>
<p><strong>齿轮啮合力的计算</strong></p>
<p>直齿圆柱齿轮</p>
<p>切向力$F_{t1}=\frac{2T_1}{d_1}=F_{t2}$</p>
<p>径向力$F_{r1}=F_{t1}tan\alpha=F_{r2}$</p>
<p>斜齿圆柱齿轮</p>
<p>切向力$F_{t1}=\frac{2T_1}{d_1}=F_{t2}$</p>
<p>径向力$F_{r1}=\frac{F_{t1}tan\alpha}{cos\beta}=F_{r2}$</p>
<p>轴向力$F_{a1}=F_{t1}tan\beta=F_{a2}$</p>
<h3 id="2-4-2齿轮失效方式和设计准则"><a href="#2-4-2齿轮失效方式和设计准则" class="headerlink" title="2.4.2齿轮失效方式和设计准则"></a>2.4.2齿轮失效方式和设计准则</h3><p><strong>轮齿整体失效</strong></p>
<p>轮齿疲劳断裂</p>
<p><strong>齿面失效</strong></p>
<p>点蚀、胶合、磨损、塑性变形</p>
<h3 id="2-4-3常用材料和热处理"><a href="#2-4-3常用材料和热处理" class="headerlink" title="2.4.3常用材料和热处理"></a>2.4.3常用材料和热处理</h3><p>要求：</p>
<blockquote>
<p>工作要求</p>
<p>工艺性要求、大尺寸需要毛坯用铸造材料比较好</p>
</blockquote>
<h3 id="2-4-4齿轮传动的精度"><a href="#2-4-4齿轮传动的精度" class="headerlink" title="2.4.4齿轮传动的精度"></a>2.4.4齿轮传动的精度</h3><h3 id="2-4-5齿轮传动的疲劳强度设计"><a href="#2-4-5齿轮传动的疲劳强度设计" class="headerlink" title="2.4.5齿轮传动的疲劳强度设计"></a>2.4.5齿轮传动的疲劳强度设计</h3><p><strong>1.弯曲疲劳强度计算</strong></p>
<p>$\sigma_F=Y_{Fa}\frac{F_t}{bm}$</p>
<p>YFa是齿形系数</p>
<p><strong>2.标准直齿圆柱齿轮的弯曲强度计算</strong></p>
<p>$\sigma_F=\frac{2KT_1}{bd_1m}Y_{FS}\leq[\sigma_F]$</p>
<p>YFs=YFaYSa</p>
<p>YSa是应力集中系数、YFs是复合齿形系数</p>
<p>引入齿宽系数$\phi_d=\frac{b}{d}$使得设计公式中只有一个变量</p>
<p><strong>3.斜齿圆柱齿轮的弯曲疲劳强度计算</strong></p>
<p>$\sigma_F=\frac{KT_1}{bd_1m}Y_{FS}Y_{\beta}\leq[\sigma_F]$</p>
<p><strong>齿轮接触疲劳强度计算</strong></p>
<p>$\sigma_H=Z_EZ_H\sqrt{\frac{2KT_1}{bd_1^2}\frac{u+-1}{u}}$</p>
<h2 id="2-5-蜗杆传动设计"><a href="#2-5-蜗杆传动设计" class="headerlink" title="2.5 蜗杆传动设计"></a>2.5 蜗杆传动设计</h2><h3 id="2-5-1与齿轮传动的主要区别"><a href="#2-5-1与齿轮传动的主要区别" class="headerlink" title="2.5.1与齿轮传动的主要区别"></a>2.5.1与齿轮传动的主要区别</h3><p>交错轴布置，有相对大的滑动速度vs</p>
<h3 id="2-5-2受力分析"><a href="#2-5-2受力分析" class="headerlink" title="2.5.2受力分析"></a>2.5.2受力分析</h3><p>$T_2=T_1i\eta_1$</p>
<p>蜗杆主动$\eta_1=\frac{tan\gamma}{tan(\gamma+\phi_v)}$</p>
<p>蜗轮主动$\eta_1=\frac{tan(\gamma-\phi_v)}{tan\gamma}$</p>
<p><strong>方向</strong></p>
<p>蜗杆主动、切向力阻力与圆周速度方向相反；蜗杆轴向力可以用斜齿轮的左右手法则</p>
<h3 id="2-5-3蜗杆传动的失效形式及常用材料"><a href="#2-5-3蜗杆传动的失效形式及常用材料" class="headerlink" title="2.5.3蜗杆传动的失效形式及常用材料"></a>2.5.3蜗杆传动的失效形式及常用材料</h3><p><strong>蜗杆材料</strong></p>
<p>蜗杆齿面的硬度比涡轮齿面要求高，常需要进行热处理提高表面硬度。</p>
<p><strong>涡轮材料</strong></p>
<p>要求与蜗杆配对具有良好减摩性能的材料。</p>
<h3 id="2-5-4蜗杆传动的工作能力设计"><a href="#2-5-4蜗杆传动的工作能力设计" class="headerlink" title="2.5.4蜗杆传动的工作能力设计"></a>2.5.4蜗杆传动的工作能力设计</h3><p><strong>弯曲疲劳强度计算</strong></p>
<p>代入斜齿轮弯曲疲劳强度计算公式：</p>
<p>$\sigma_F=\frac{1.53KT_2}{d_1d_2mcos\gamma}Y_{Fa2}Y_{\beta}$</p>
<p><strong>涡轮接触疲劳应力计算</strong></p>
<p>$\sigma_H = Z_E\sqrt{\frac{9KT_2}{d_1d_2}}$</p>
<p><strong>蜗杆刚度校核</strong></p>
<p>$y=\frac{\sqrt{F_{t1}^2+F_{t2}^2}}{48EI}l^3$</p>
<h3 id="2-5-4主要参数选择与设计举例"><a href="#2-5-4主要参数选择与设计举例" class="headerlink" title="2.5.4主要参数选择与设计举例"></a>2.5.4主要参数选择与设计举例</h3><p>蜗杆头数z1与涡轮齿数z2</p>
<p>中心距</p>
<p>导程角</p>
<p>涡轮变位</p>
<h2 id="2-6螺旋传动设计"><a href="#2-6螺旋传动设计" class="headerlink" title="2.6螺旋传动设计"></a>2.6螺旋传动设计</h2><h3 id="2-6-1螺纹主要参数"><a href="#2-6-1螺纹主要参数" class="headerlink" title="2.6.1螺纹主要参数"></a>2.6.1螺纹主要参数</h3><p>大径d，小径d1，中径d2(用于计算，牙厚等于槽宽)，螺距P，线数n，导程S，螺纹升角$\gamma$，旋向：左旋和右旋</p>
<h3 id="2-6-2受力、失效和材料"><a href="#2-6-2受力、失效和材料" class="headerlink" title="2.6.2受力、失效和材料"></a>2.6.2受力、失效和材料</h3><p>根据耐磨性计算螺杆直径，校核螺母和螺杆强度，大长径比和自锁要求还应该检查稳定性和自锁性能。</p>
<h3 id="2-6-3工作能力设计"><a href="#2-6-3工作能力设计" class="headerlink" title="2.6.3工作能力设计"></a>2.6.3工作能力设计</h3><p><strong>耐磨性计算</strong></p>
<p>$p = \frac{FP}{\pi{d_2}hH}\leq{[p]}$</p>
<p>方便计算取高径比$\phi =\frac{H}{d}$</p>
<p>$d\geq\sqrt{\frac{FP}{\pi{h}\phi{[p]}}}$</p>
<p><strong>强度计算</strong></p>
<p>第三强度准则</p>
<p><strong>压杆稳定性计算</strong></p>
<p><strong>自锁能力</strong></p>
<p><strong>传动效率</strong></p>
<h3 id="2-4-3一般步骤"><a href="#2-4-3一般步骤" class="headerlink" title="2.4.3一般步骤"></a>2.4.3一般步骤</h3><p>选定螺纹类型，确定牙型角和高径比</p>
<p>选择材料，查到许用压力和摩擦系数</p>
<p>从耐磨性出发选择中径</p>
<p>选择螺距，校核自锁性能</p>
<p>计算螺母高度</p>
<p>计算旋合圈数Z</p>
<p>校核强度，不满足加大螺距或中径</p>
<p>受压螺杆校核稳定性</p>
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<h1 id="机械零部件设计概述"><a href="#机械零部件设计概述" class="headerlink" title="机械零部件设计概述"></a>机械零部件设计概述</h1><h2 id="1-1机械零部件设计的要求"><a href="#1-1机械零部件设计的要求" class="headerlink" title="1.1机械零部件设计的要求"></a>1.1机械零部件设计的要求</h2><p>性能要求</p>
<blockquote>
<p>强度要求</p>
<p>刚度要求</p>
<p>寿命要求</p>
</blockquote>
<p>工艺性要求</p>
<p>经济性要求</p>
<h2 id="1-2工作能力设计的基本方法"><a href="#1-2工作能力设计的基本方法" class="headerlink" title="1.2工作能力设计的基本方法"></a>1.2工作能力设计的基本方法</h2><blockquote>
<p>强度准则</p>
<p>刚度准则</p>
<p>振动稳定性准则</p>
<p>耐热性准则</p>
<p>寿命准则</p>
</blockquote>
<h2 id="1-3强度设计"><a href="#1-3强度设计" class="headerlink" title="1.3强度设计"></a>1.3强度设计</h2><p>1.静强度设计（材料力学）</p>
<h3 id="1-3-2-疲劳强度设计"><a href="#1-3-2-疲劳强度设计" class="headerlink" title="1.3.2.疲劳强度设计"></a>1.3.2.疲劳强度设计</h3><p>特征：</p>
<blockquote>
<p>在交变应力作用下，零件可能在远低于屈服强度条件下破坏</p>
<p>无论脆性材料还是塑性材料，疲劳断裂表现为无显著塑性变形的脆性断裂</p>
<p>疲劳失效是一个累积损伤的过程，经过裂纹的萌生和扩展</p>
<p>复杂现象，没有普适规律，有实验规律</p>
<p>疲劳实验是必要的</p>
</blockquote>
<p>变应力类型及表征</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">graph LR</span><br><span class="line">A[变应力]-->B[循环变应力]</span><br><span class="line">A-->C[随机变应力]</span><br><span class="line">B-->D[稳定循环变应力]</span><br><span class="line">D-->E[对称循环变应力]</span><br><span class="line">D-->F[脉动循环变应力]</span><br><span class="line">D-->G[非对称循环变应力]</span><br></pre></td></tr></table></figure>
<p>特性系数$r=\frac{\sigma_{min}}{\sigma_{max}}$</p>
<p>极限应力与循环次数的关系</p>
<p>$\sigma^m_{rN}N = \sigma^m_rN_0 = C$</p>
<p>接触疲劳强度 赫兹公式</p>
<p>$\sigma_H = \sqrt{\frac{F}{4\pi}\frac{\frac{1}{\rho_1}\pm\frac{1}{\rho_2}}{\frac{1-\mu^2_1}{E_1}+\frac{1-\mu^2_2}{E_2}}}$</p>
<p>其中加号表示外接触减号表示内接触</p>
<h2 id="1-4材料选择"><a href="#1-4材料选择" class="headerlink" title="1.4材料选择"></a>1.4材料选择</h2><p>选择原则：</p>
<blockquote>
<p>使用功能要求</p>
<p>加工工艺要求</p>
<p>经济性要求</p>
</blockquote>
<h2 id="1-5标准化"><a href="#1-5标准化" class="headerlink" title="1.5标准化"></a>1.5标准化</h2><blockquote>
<p>零部件标准 螺栓、螺母、垫圈、滚动轴承</p>
<p>结构要素标准 螺纹、齿轮齿廓、花键</p>
<p>材料标准</p>
<p>检验标准 尺寸精度、形状与位置精度、表面形貌、表面硬度</p>
<p>设计方法标准 </p>
<p>表达方法标准</p>
</blockquote>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
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<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
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jsonContent:
meta: false
pages: false
posts:
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date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
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