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          多通道同步测试丨精密机械-手表的跌落试验        </h1>
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        2021-04-09        </span> <span class="p_10">浏览：
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        <p style="text-align: center; max-inline-size: 100%; margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; min-height: 1em; cursor: text; box-sizing: border-box !important; outline: none 0px !important;"><strong style="font-size: 18px;font-family: arial, helvetica, sans-serif;"><span style="text-align: left;">手表的跌落测试丨非接触式多点同步测量</span></strong><br/></p><p style="text-align: center; max-inline-size: 100%; margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; min-height: 1em; cursor: text; box-sizing: border-box !important; outline: none 0px !important;"><span style="font-size: 18px;font-family: arial, helvetica, sans-serif;"><strong><span style="text-align: left;"></span></strong></span></p><p style="text-align: center; max-inline-size: 100%; margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; min-height: 1em; cursor: text; box-sizing: border-box !important; outline: none 0px !important;"><img height="342" style="box-sizing: border-box; text-indent: 0em; width: 351px !important; height: auto !important; visibility: visible !important;" width="351" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGYMomlplJhtBw5qoZez0cKueX89W50eZr7bQoDRaeRzgffolBmkktuw/640?tp=wxpic&wxfrom=10005&wx_lazy=1#imgIndex=1" class="" alt="图片"/><br/></p><p></p><section><p style="text-align:center;"><br/></p><section><span style="font-size: 14px;">跌落试验的主要目的是分析敏感结构在跌落和冲击过程中的动力学特性。在本次试验中，使用表头(手表去掉表带部分)作为精密机械测试样品，获得其不同部位不同点在自由落体撞击地面前后瞬间的振动位移，速度和加速度曲线。</span><p style="text-indent: 2em;"><br/></p><section><section><section><section><h2 style="font-size: 16px; line-height: 1.6;"><strong style="color: inherit;caret-color: red;font-size: 18px;font-family: arial, helvetica, sans-serif;"><span style="text-decoration-style: solid;text-decoration-color: #333333;"><strong style="text-align: center; color: rgb(0, 0, 0); font-family: sans-serif;">试验装置</strong></span></strong></h2><h3 style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 16px; line-height: 1.6; box-sizing: border-box !important; outline: none 0px !important;"><strong style="color: inherit;caret-color: red;font-size: 18px;font-family: arial, helvetica, sans-serif;"><span style="text-decoration-style: solid;text-decoration-color: #333333;"><strong style="text-align: center; color: rgb(0, 0, 0); font-family: sans-serif;"></strong></span></strong></h3><h3 style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 16px; line-height: 1.6; box-sizing: border-box !important; outline: none 0px !important;"><span style="font-family: arial, helvetica, sans-serif;"><strong style="max-inline-size: 100%;margin: 0px;padding: 0px;box-sizing: border-box !important;outline: none 0px !important;cursor: text;color: inherit;caret-color: red;font-size: 18px;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; text-decoration-style: solid; text-decoration-color: rgb(51, 51, 51); box-sizing: border-box !important; outline: none 0px !important;"><strong style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; text-align: center; color: rgb(0, 0, 0); font-family: sans-serif; box-sizing: border-box !important; outline: none 0px !important;"></strong></span></strong></span></h3><h3 style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 16px; line-height: 1.6; box-sizing: border-box !important; outline: none 0px !important;"><span style="font-family: arial, helvetica, sans-serif;"><strong style="max-inline-size: 100%;margin: 0px;padding: 0px;box-sizing: border-box !important;outline: none 0px !important;cursor: text;color: inherit;caret-color: red;font-size: 18px;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; text-decoration-style: solid; text-decoration-color: rgb(51, 51, 51); box-sizing: border-box !important; outline: none 0px !important;"><strong style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; text-align: center; color: rgb(0, 0, 0); font-family: sans-serif; box-sizing: border-box !important; outline: none 0px !important;"></strong></span></strong></span></h3></section></section></section></section><p><br/></p><p style="text-align:center;text-indent: 0em;"><span style="box-sizing: border-box;font-size: 14px;font-family: 宋体, SimSun;"><img height="321" style="box-sizing: border-box; width: 315px !important; height: auto !important; visibility: visible !important;" width="315" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGSRric1sbzfY1ttw50icic0mXUALiaYNrutyDlDtfuyQGnmdZoAS7yCaXrA/640?tp=wxpic&wxfrom=10005&wx_lazy=1#imgIndex=2" class="" alt="图片"/></span></p><p style="text-align:center;"><span style="font-size: 12px;">图1：8个光纤头同步测试表头</span></p><p style="text-align:center;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">测量表头八个点在冲击之前、期间及之后的振动速度。为确保表头落下的确切位置，为此我们还专门设计了一个手表测试工作台。由于无法不停重复跌落试验，这八个点的测试就需要同步进行。</span></p><p style="text-indent: 2em;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">德国Polytec公司的MPV-800多点式激光测振仪，同步测试最多可达48通道，输出时域和频域振型。</span></p><p style="text-indent: 2em;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">本次试验中，我们还使用到了中心摄像机，确保这些测点位置更精确。如图2所示。</span></p><p><br/></p><p style="text-align:center;"><img height="467" style="box-sizing: border-box; width: 262px !important; height: auto !important; visibility: visible !important;" width="262" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGCU2ibw0BApoX5KPIZul4f0oKy008VcPBarVFrgQ9QXyQ9f5BFoOT3jQ/640?tp=wxpic&wxfrom=10005&wx_lazy=1#imgIndex=3" class="" alt="图片"/></p><p style="text-align:center;"><span style="font-size: 12px;">图2：使用MPV-800的试验装置，测量表头自由落体后的冲击响应</span></p><p style="text-align:center;"><br/></p><section><section><section><section><h3 style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 16px; line-height: 1.6; box-sizing: border-box !important; outline: none 0px !important;"><strong style="color: inherit;caret-color: red;font-size: 18px;font-family: arial, helvetica, sans-serif;"><span style="text-decoration-style: solid;text-decoration-color: #333333;"><strong style="text-align: center; color: rgb(0, 0, 0); font-family: sans-serif;">测试结果</strong></span></strong></h3></section></section></section></section><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(33, 37, 41); text-indent: 2em; font-family: -apple-system, BlinkMacSystemFont, "><br/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(33, 37, 41); text-indent: 2em; font-family: -apple-system, BlinkMacSystemFont, "><span style="font-size: 14px;">在测试过程中，将速度记录为时间的函数。本次测试记录了表头的8个特定测点在约8ms内的振动速度：撞击前3ms，撞击后5ms。将不同测点的速度曲线叠加到一起，便于数据间的对比，如图3所示。谱图还显示了撞击过程中表头呈现出不同的振动特性。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(33, 37, 41); text-indent: 2em; font-family: -apple-system, BlinkMacSystemFont, "><br/></p><p style="text-align: center; box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(33, 37, 41); font-family: -apple-system, BlinkMacSystemFont, "><img height="132" style="box-sizing: border-box; width: 337px !important; height: auto !important; visibility: visible !important;" width="337" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGuCfdHVm78GIw6bvtL8VU0dVOHJHAlDO2MQa9kEAicB56Mo0c5uqeZZg/640?tp=wxpic&wxfrom=10005&wx_lazy=1#imgIndex=4" class="" alt="图片"/></p><p style="text-align:center;"><span style="font-size: 12px;">图3：时间-位移曲线</span></p><p style="text-align:center;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">通过MPV软件我们可以看到表头的3D振型，如图4所示。</span></p><p style="text-indent:28px;"><br/></p><p style="text-align:center;text-indent: 0em;"><img height="238" style="box-sizing: border-box; width: 368px !important; height: auto !important; visibility: visible !important;" width="368" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGQhIDGNWgYZkJiavxCfnpna6o0BwtziaNfiblOfXLP0ot7qua11hd7VjSg/640?tp=wxpic&wxfrom=10005&wx_lazy=1#imgIndex=5" class="" alt="图片"/></p><p style="text-align:center;"><span style="font-size: 12px;">图4：表头运动可视化</span></p><p style="text-align:center;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">除此之外，我们还可看到表头在受到撞击后是如何旋转的。为了有更好的视觉效果，我们进行了数据后处理。利用MPV软件对速度进行微分和积分，分别得到加速度和位移。</span></p><p style="text-align:center;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px;">将时间差为50μs 的5个位移曲线叠加到一起，如图5所示，通过数据后处理我们可以很清楚的看到表头收到撞击后的旋转情况。</span></p><p style="text-indent: 2em;"><br/></p><p style="text-align:center;"><img height="166" style="box-sizing: border-box; width: 416px !important; height: auto !important; visibility: visible !important;" width="416" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGJOJokYZxahnft0yU3Vic02IdAvnIKiapAhGAVtT29RUic6WhhImJwpfsQ/640?wxfrom=13&tp=wxpic#imgIndex=6" class="" alt="图片"/></p><p style="text-align:center;"><span style="font-size: 12px;">图5：5个不同测试时间下的响应曲线组合</span></p><p style="text-align:center;"><br/></p><p style="text-indent: 2em;"><span style="font-size: 14px; text-indent: 28px;">时间-加速度曲线还为我们提供了额外信息：受到冲击后，手表单个部件的振动响应各不相同。</span><br/></p><p style="text-indent: 2em;"><br/></p><p style="text-align:center;"><img height="143" style="box-sizing: border-box; width: 367px !important; height: auto !important; visibility: visible !important;" width="367" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGBVfBvNNlcK92EUHbMkdiaiaURhqMSibmtI7k2VaYibTeC8lM5YUfKcljuA/640?wxfrom=13&tp=wxpic#imgIndex=7" class="" alt="图片"/></p><p style="text-align:center;"><span style="font-size: 12px;">图6：时间-加速度曲线</span></p><p style="text-align:center;"><br/></p><p style="text-align:center;"><img height="141" style="box-sizing: border-box; width: 358px !important; height: auto !important; visibility: visible !important;" width="358" src="https://mmbiz.qpic.cn/mmbiz_png/jv4sXPkdTelEMrWHzgK7ZgGSuLy5A0nGOFpTwFBiczDHkM7YI155E2YKZ8zrX25af3UIExyfKWj2wgLDAHjrlPg/640?wxfrom=13&tp=wxpic#imgIndex=8" class="" alt="图片"/></p><p style="text-align:center;"><br/></p><p style="text-align:center;"><span style="font-size: 12px;">图7：时间-速度曲线</span></p><p style="text-align:center;"><br/></p><section><section><section><section><span style="font-size: 18px;font-family: arial, helvetica, sans-serif;">总结与展望</span></section></section></section></section><section><section><section><section><section><section><p style="text-indent:28px;"><br/></p><p style="text-align: left; max-inline-size: 100%; margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; min-height: 1em; cursor: text; color: rgb(51, 51, 51); font-size: 16px; text-indent: 35px; box-sizing: border-box !important; outline: none 0px !important;"><span style="background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;caret-color: red;">MPV</span><span style="background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;caret-color: red;">非接触式多点同步测振系统能有效地评估动态冲击响应。</span></p><p style="text-align: left; max-inline-size: 100%; margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; min-height: 1em; cursor: text; color: rgb(51, 51, 51); font-size: 16px; text-indent: 35px; box-sizing: border-box !important; outline: none 0px !important;"><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">MPV-800</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">使用独立的光纤光学头，可以任意放置在物体周围，如有需要还可以组合成</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">3D</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">通道。高达</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">250000</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">次</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">/</span><span style="caret-color: red;background-color: initial;color: #5d78c3;font-size: 14px;text-align: justify;text-indent: 28px;">秒的采样频率，以极高的精度和分辨率获取极短时间内的冲击响应。所获结果可用于数据后处理和模型升级。</span></p></section></section></section></section></section></section></section></section><p></p><p><br/></p>      </div>
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