可靠性分配-目标可行性法

123 发表于 2007-3-5 12:10:03

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<p>      在产品的设计阶段，就要把要求的MTBF“设计进”产品里。当产品的结构复杂时，将可靠性指标自上而下逐级地分配到各个简单的结构。它是一个由整体到局部，由上到下的分解过程，即将整个系统的可靠性要求转换为每一个分系统的可靠性要求.这个过程就叫做可靠性分配。可靠性分配有许多方法，如等分配法、AGREE分配法、航空无线电公司分配法、目标可行性法、最小工作量算法和动态规划法等。<br/><br/><strong>目标可行性法（Feasibility-Of-ObjectivesTechnique）</strong><divclass='Anm129'>中国可靠性网</div></p>
<div>在产品的可靠性数据缺乏的情况下，可以请熟悉产品、有工程实际经验的专家，按照影响产品可靠性的几种主要因素（如：复杂度、技术成熟度、重要度及环境条件）进行评分（每一种因素的分值在1~10之间，难度越高评分越高），然后根据评分的结果给各分系统或部件分配可靠性指标。例如某个系统（要求的MTBF为500h）由A/B/C/D四个部件组成，各部件评分如下表：</div>
<tablecellspacing="0"cellpadding="0"border="1">
<tbody>
<tr>
<tdwidth="40">
<divalign="center">部件</div>
</td>
<tdwidth="43">
<divalign="center">复杂度</div>
</td>
<tdwidth="61">
<divalign="center">技术成熟度</div>
</td>
<tdwidth="52">
<divalign="center">重要度</div>
</td>
<tdwidth="52">
<divalign="center">环境条件</div>
</td>
<tdwidth="65">
<divalign="center">各部件评分</div>
</td>
<tdwidth="82">
<divalign="center">各部件评分系数Ci</div>
</td>
<tdwidth="96">
<divalign="center">分配给各部件的故障率</div>
</td>
<tdwidth="100">
<divalign="center">分配给各部件的MTBF</div>
</td>
</tr>
<tr>
<tdwidth="40">
<divalign="center">A</div>
</td>
<tdvalign="bottom"width="43">
<divalign="center">8</div>
</td>
<tdvalign="bottom"width="61">
<divalign="center">9</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">8</div>
</td>
<tdvalign="bottom"width="65">
<divalign="center">3456</div>
</td>
<tdvalign="bottom"width="82">
<divalign="center">0.462279</div>
</td>
<tdvalign="bottom"width="96">
<divalign="center">0.00092456</div>
</td>
<tdvalign="bottom"width="100">
<divalign="center">1081.597</div>
</td>
</tr>
<tr>
<tdwidth="40">
<divalign="center">B</div>
</td>
<tdvalign="bottom"width="43">
<divalign="center">5</div>
</td>
<tdvalign="bottom"width="61">
<divalign="center">7</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">8</div>
</td>
<tdvalign="bottom"width="65">
<divalign="center">1680</div>
</td>
<tdvalign="bottom"width="82">
<divalign="center">0.224719</div>
</td>
<tdvalign="bottom"width="96">
<divalign="center">0.00044944</div>
</td>
<tdvalign="bottom"width="100">
<divalign="center">2225</div>
</td>
</tr>
<tr>
<tdwidth="40">
<divalign="center">C</div>
</td>
<tdvalign="bottom"width="43">
<divalign="center">5</div>
</td>
<tdvalign="bottom"width="61">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">5</div>
</td>
<tdvalign="bottom"width="65">
<divalign="center">900</div>
</td>
<tdvalign="bottom"width="82">
<divalign="center">0.120385</div>
</td>
<tdvalign="bottom"width="96">
<divalign="center">0.00024077</div>
</td>
<tdvalign="bottom"width="100">
<divalign="center">4153.333</div>
</td>
</tr>
<tr>
<tdwidth="40">
<divalign="center">D</div>
</td>
<tdvalign="bottom"width="43">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="61">
<divalign="center">6</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">8</div>
</td>
<tdvalign="bottom"width="52">
<divalign="center">5</div>
</td>
<tdvalign="bottom"width="65">
<divalign="center">1440</div>
</td>
<tdvalign="bottom"width="82">
<divalign="center">0.192616</div>
</td>
<tdvalign="bottom"width="96">
<divalign="center">0.00038523</div>
</td>
<tdvalign="bottom"width="100">
<divalign="center">2595.833</div>
</td>
</tr>
<tr>
<tdwidth="247"colspan="5">
<div>合计</div>
</td>
<tdvalign="bottom"width="65">
<divalign="center">7476</div>
</td>
<tdvalign="bottom"width="82">
<divalign="center">1</div>
</td>
<tdvalign="bottom"width="96">
<divalign="center">0.002</div>
</td>
<tdvalign="bottom"width="100">
<divalign="center">500</div>
</td>
</tr>
</tbody>
</table>
<div>说明:（1）对四个部件（A/B/C/D）按四种因素评分后，填入上表.</div>
<div>（2）对A部份而言，最后评分为8*9*6*8＝3456；B的评分为5*7*6*8＝1680；同理C的评分为900、D的评分为1440；最后四部分总分为：7476；。</div>
<div>（3）对A部份而言，评分系数为3456/7476＝0.46；B的评分系数为1680/7476＝0.22；C的评分系数为0.12；D的评分系数为0.19；。</div>
<div>（4）对整个系统而言，失效率为1/500＝0.002；</div>
<div>所以分配给A的失效率为：0.46*0.002＝0.0009，对应的MTBF为1081.6H；</div>
<div>同理得B/C/D的失效率和MTBF。</div>

刘波发表于 2020-4-21 15:57:06

Never too too old to to learn.

楼主辛苦，学习了！谢谢分享！

zk52099 发表于 2020-4-21 22:07:11

没有看懂

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可靠性分配-目标可行性法