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12pt; background-color: transparent;"><span class="2"><span style="font-family: SimSun;">2.4.3</span></span></st1:chsdate><span class="2" style="line-height: 12pt; background-color: transparent;">结合面刚度、阻尼参数的确定方法</span></p> <div class="Section1"> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"><span class="2">完成结合面的等效力学建模后，需要确定结合面的刚度和阻尼参数。吉村允孝研 究成果表明，平均接触压力相同时，单位面积结合面的动态性能数据是相同的，实际 结合面的刚度、阻尼值可通过对结合面求积分得到<sup>[28]</sup>。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"><span class="2">结合面可能承受的动态力包括六个自由度上的广义力，分别为正向力</span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">F</span></span><span class="2"><sub><span style="font-family: SimSun;">v;</span></sub></span><span class="2">切向力 </span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">F<sub>x</sub></span></span><span class="210pt">、</span><span class="210pt">绕各坐标轴的弯矩和</span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">M</span></span><span class="2"><span style="font-family: SimSun;">&</span></span><span class="2">，</span><span class="2">如图</span><span class="2"><span style="font-family: SimSun;">2.14</span></span><span class="2">所示，而实际结合面受力情 况通常是承受其中的若干种力的合力。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; line-height: 20.65pt; background: transparent;"><span class="2"><sub><span style="font-family: SimSun;">C|</span></sub></span><span class="2"><span style="font-family: SimSun;"> </span></span><span class="2">(凡）为单位而积切向等效阻尼；</span><span class="211pt"><sub><span lang="EN-US" style="font-size: 11pt;">C</span></sub></span><span class="2"><sub><span style="font-family: SimSun;">2</span></sub></span><span class="2"><span style="font-family: SimSun;">(</span></span><span class="211pt"><sub><span lang="EN-US" style="font-size: 11pt;">A</span></sub></span><span class="2"><span style="font-family: SimSun;">,)</span></span><span class="2">为平位而积法向等效阻尼，均为接触压力 的函数。当结合部材料刚度较高时，</span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">nj</span></span><span class="2"><span style="font-family: 'Times New Roman';">•</span></span><span class="2">假设接触压力在结合</span><span class="2"><span style="font-family: SimSun;">[</span></span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">fr</span></span><span class="2">丨上均布，此时以</span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">h</span></span><span class="2">两式 表示为：</span></p> </div> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 20.9pt; background: transparent;"><span class="2">运用吉村允孝法可将研究机械实际结合面动态特性参数的任务转变为研究单位面 积、条件相同的结合面的动态特性参数。而单位面积结合面的动态特性参数与试件结 构是无关的，因此，只需研究结构非常简单的单位面积结合面试件的动态特性参数， 即可将所得参数推广到实际的整个结合面上。测试试件在不同接触压力下的结合面特 征参数，可得到特征参数与接触压力的关系曲线。在结合面材质、加工方法、润滑情 况等结合条件相同的情况下，即可根据实际结合面的平均接触压力查得结合面特征参 数，再经过积分便得到实际结合面的刚度和阻尼值。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 20.9pt; background: transparent;"><span class="2">使用吉村允孝法积分法确定结合面动态特性参数优点显著，只需制造出与实际结 合面工况条件相同的简单试件，应用于分析大中型机械系统时可有效降低试验难度、 和工作量。同时，该方法测得的参数适用于结合条件相同的场合，具有一定的通用 性。跟理论建模与动态试验相结合的参数辨识法相比，不需要对整个机械系统做模态 试验即可获得结合面动态特性参数，即使是无法进行整机试验的情况下，也可通过实 验获得结合面特性参数。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 20.9pt; background: transparent;"> </p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 20.9pt; background: transparent;"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“</span><span lang="EN-US" style="font-size:9.0pt">SGM50A</span><span style="font-size:9.0pt; font-family:宋体;mso-ascii-font-family:"Times New 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