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style="font-size: 10.5pt;">4.2</span></span></a><span class="1" style="line-height: 15pt; background-color: transparent;"><span style="font-size: 10.5pt;">现场故障数据的可靠性建模与分析</span></span></p> <p class="30" style="margin-bottom:12.3pt;line-height:13.0pt;mso-line-height-rule: exactly;mso-pagination:lines-together;page-break-after:avoid;background:transparent"><a name="bookmark45"></a><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="3"><span style="font-size: 10.5pt;">4.2.1</span></span></st1:chsdate><span class="3"><span style="font-size: 10.5pt;">现场试验的对象与数据的收集</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 27.0pt;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">现场加工中心的试验对象是数控机床中的</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">YP</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">系列圆盘式刀库，数据采集时 间是从加工中心数控机床调试完成后开始的。选取了从2011年~2013年间的加 工中心数控机床。通过附录1表</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">A</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">-3</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">记录每台数控机床现场加工中出现的有关圆 盘式刀库的故障，并判断该故障是否是关联故障，将每台机床出现的关联故障通 过附录1表</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">A</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">-7</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">进行统计。将统计结果整理，具体见附录2表</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">B</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">-1,</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">从附录2表 </span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">B</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">-1</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">中可以看出</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">YP</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">系列圆盘刀库在2011~2013年共出现92次故障。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="30" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:33.1pt; mso-line-height-rule:exactly;mso-pagination:lines-together;page-break-after: avoid;background:transparent"><a name="bookmark46"></a><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="3"><span style="font-size: 10.5pt;">4.2.2</span></span></st1:chsdate><span class="3"><span style="font-size: 10.5pt;">现场故障数据的可靠性建模</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" align="left" style="line-height: 33.1pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="2Verdana"><span style="font-size: 10.5pt;">4.2.2</span></span></st1:chsdate><span class="2Verdana"><span style="font-size: 10.5pt;">.1</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">可靠性模型确立</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 27.0pt;line-height:33.1pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">故障数据的直方图是一种根据采集的故障间隔时间和在该故障间隔时间内 的频数或者频率所绘制的二维统计表，根据直方图形状变化的趋势能够大致推断 加工中心故障数据的分布形式。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="493" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="211" align="left" style="line-height: 11pt; background: transparent;"><span class="21"><span style="font-size: 10.5pt;">表</span></span><span class="21"><span style="font-size: 10.5pt;">4. </span></span><span class="21"><span style="font-size: 10.5pt;">1现场换刀系统故障间隔时间频率频数统计表</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <div align="center"> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;mso-table-layout-alt:fixed;mso-padding-alt: 0cm 0cm 0cm 0cm"> <tbody> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:20.9pt;mso-height-rule: exactly"> <td width="53" valign="bottom" style="width: 39.85pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 10pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">组号</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="70" valign="bottom" style="width: 52.3pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 10pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">区间上</span></span><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">[</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="74" valign="bottom" style="width: 55.7pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 12pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">区间下</span></span><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">）</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="76" valign="bottom" style="width: 56.65pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">组中值</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="47" valign="bottom" style="width: 35.5pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 7pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">频数</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="82" valign="bottom" style="width: 61.7pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="center" style="text-align:center;line-height:10.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:369.85pt;mso-element-wrap:no-wrap-beside; mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column; mso-element-left:center;mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">频率</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="91" valign="bottom" style="width: 68.15pt; border-style: solid solid none; border-top-color: windowtext; border-right-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-right-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 20.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">累计频率</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:20.4pt;mso-height-rule:exactly"> <td width="53" valign="bottom" style="width: 39.85pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="center" style="text-align:center;line-height:10.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:369.85pt;mso-element-wrap:no-wrap-beside; mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column; mso-element-left:center;mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">1</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="70" valign="bottom" style="width: 52.3pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 14pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">49.75</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="74" valign="bottom" style="width: 55.7pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 12pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">548.97</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="76" valign="bottom" style="width: 56.65pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">299.36</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="47" valign="bottom" style="width: 35.5pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">34</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="82" valign="bottom" style="width: 61.7pt; border-style: solid none none solid; border-top-color: windowtext; border-top-width: 1pt; border-left-color: windowtext; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 11pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">0.369565</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="91" valign="bottom" style="width: 68.15pt; border-style: solid solid none; border-top-color: windowtext; border-right-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-right-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 20.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">0.369569</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> </tr> <tr style="mso-yfti-irow:2;mso-yfti-lastrow:yes;height:22.8pt;mso-height-rule: exactly"> <td width="53" style="width: 39.85pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="center" style="text-align:center;line-height:10.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:369.85pt;mso-element-wrap:no-wrap-beside; mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column; mso-element-left:center;mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">2</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 10pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">548.97</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="74" style="width: 55.7pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 12pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">1048.19</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="76" style="width: 56.65pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">798.58</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="47" style="width: 35.5pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span style="font-size: 10.5pt; font-family: 宋体;">25</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="82" style="width: 61.7pt; border-style: solid none solid solid; border-top-color: windowtext; border-bottom-color: windowtext; border-left-color: windowtext; border-top-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 11pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">0.271739</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> <td width="91" style="width: 68.15pt; border: 1pt solid windowtext; padding: 0cm; height: 22.8pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="210" align="left" style="margin-left: 13pt; line-height: 10.5pt; background: transparent;"><span class="2SimSun27"><span lang="EN-US" style="font-size: 10.5pt;">0.641304</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> </td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> </div> <!--[if !supportTextWrap]--> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="493" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="MsoNormal"><span style="font-family: MingLiU; font-size: 10.5pt;"> </span></p> </td> </tr> </tbody> </table> </div> <p><span lang="EN-US" style="font-size:10.5pt;font-family:MingLiU; mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA"> <span class="2SimSun30"><span style="font-size: 10.5pt;">通过计算得出</span></span><span class="2SimSun30"><span lang="EN-US" style="font-size: 10.5pt;">〇</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">■ = 756.554 </span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">h</span></span><span class="2SimSun30"><span lang="EN-US" style="font-size: 10.5pt; font-family: MingLiU;">。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 24.0pt;line-height:11.5pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">11.</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">现场故障频率以及累计频率的直方图</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="margin-left:0cm;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;line-height:17.5pt;mso-line-height-rule:exactly;mso-list: l0 level1 lfo1;tab-stops:46.7pt;background:transparent"><!--[if !supportLists]--><span style="font-size: 11.5pt; font-family: SimSun;">(1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">.</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">故障频率直方图如图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.1</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">所示。其中横坐标为故障间隔时间，纵坐标为 各组频率与组距的比值，即</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">/./</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">心。故障频率直方图能够大致的描绘出故障间隔</span></span><span style="font-size:10.5pt;mso-bidi-font-family:MingLiU"><o:p></o:p></span></p> <p class="210" align="left" style="background: transparent;"><span class="2SimSun30"><span style="font-size: 10.5pt;">时间的概率密度函数曲线。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="margin-left:0cm;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;mso-list:l0 level1 lfo1;tab-stops:46.7pt;background:transparent"><!--[if !supportLists]--><span style="font-size: 11.5pt; font-family: SimSun;">(2)<span style="font-stretch: normal; font-size: 7pt; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">.</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">故障累计频率直方图如图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.2</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">所示。其中横坐标为故障间隔时间，纵坐 标为累计频率。故障累计频率直方图能够大致的描绘出故障间隔时间的概率分布</span></span><span style="font-size:10.5pt;mso-bidi-font-family:MingLiU"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 24.0pt;line-height:19.7pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">由图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.1</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">可知，故障频率直方图呈现单调递减形式，并且在直方图下降到一 定程度后又有平稳的趋势。对比图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.3</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">常用概率密度分布模型中的曲线形状，可 以发现，该组数据不可能是对数正态分布和正态分布，有可能是指数分布或者威 布尔分布模型。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 24.0pt;line-height:19.7pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">如图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.2</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">可知，故障累计频率直方图呈上凸形式。由于故障累计频率直方图 能够直观的表示出样本的概率分布函数曲线走向，而样本的概率分布函数与概率 密度函数具有一定的关系：假设样本的概率分布函数为</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">F</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">(</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">t</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">),</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">概率密度函数为 </span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">/</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">Xt</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">)<sup>[52][53]</sup></span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">。两者的关系为：</span></span><span style="font-size:10.5pt"><br clear="all" style="mso-special-character:line-break; page-break-before:always" /> <o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;line-height:19.45pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">从图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.2</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">中只能看出故障累计频率随着故障间隔时间单调上升，其斜率的变 化从直观上也是呈现不断减小的趋势，但由于一开始斜率变化比较快，也可能存 在斜率先增加后减小的趋势，即存在拐点的情况。如者可以推出/⑴>0且有 </span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">/’(</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">t</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">)<0,</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">即概率密度函数在</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">f</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">>0</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">的情况下，位于右半正区域，且单调递减，符</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;line-height: 18.5pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">合这种状态的分布模型有指数分布模型、威布尔分布模型以及正态分布模型；后 者可以推出/⑴>0且存在某个时间点使</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">/(</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">〇</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;"> = 0,</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">即概率密度函数在</span></span><span class="2TimesNewRoman"><span lang="EN-US" style="font-size: 10.5pt;">r</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">>0</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">的情</span></span><span style="font-size: 10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;background: transparent"><span class="2SimSun30"><span style="font-size: 10.5pt;">况下，位于右半正区域，且存在单峰，符合这种状态的分布模型有威布尔分布模 型以及对数正态分布模型。</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;background:transparent"><!--[if gte vml 1]><o:wrapblock><v:shape id="_x0000_s1028" type="#_x0000_t202" style='position:absolute;left:0;text-align:left; margin-left:37.55pt;margin-top:38.9pt;width:167.75pt;height:7.5pt; text-indent:0;z-index:-2;mso-wrap-distance-left:32.4pt; mso-wrap-distance-right:10.3pt;mso-wrap-distance-bottom:.95pt; mso-position-horizontal-relative:margin' wrapcoords="178 0 21600 0 21600 20584 16876 20584 16876 21600 0 21600 0 19561 178 19561 178 0" filled="f" stroked="f"> <v:textbox style='mso-next-textbox:#_x0000_s1028;mso-fit-shape-to-text:t' inset="0,0,0,0"> <![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=9 style='margin-top:0cm;line-height:7.5pt;mso-line-height-rule: exactly;tab-stops:31.2pt 93.1pt;background:transparent'><o:p> </o:p></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> <w:wrap type="topAndBottom" anchorx="margin" /> </v:shape><v:shape id="_x0000_s1029" type="#_x0000_t202" style='position:absolute; left:0;text-align:left;margin-left:217.1pt;margin-top:36.95pt;width:169.45pt; height:7.5pt;text-indent:0;z-index:-1;mso-wrap-distance-left:5pt; mso-wrap-distance-right:30.7pt;mso-position-horizontal-relative:margin' wrapcoords="0 0 20884 0 20884 20343 21600 20374 21600 21600 739 21600 739 20374 0 20343 0 0" filled="f" stroked="f"> <v:textbox style='mso-next-textbox:#_x0000_s1029;mso-fit-shape-to-text:t' inset="0,0,0,0"> <![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=9 style='margin-top:0cm;text-align:justify;text-justify:inter-ideograph; line-height:7.5pt;mso-line-height-rule:exactly;tab-stops:39.35pt 79.2pt 118.55pt 157.45pt; background:transparent'><o:p> </o:p></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> <w:wrap type="topAndBottom" anchorx="margin" /> </v:shape><![endif]--><!--[if !vml]--> <!--[endif]--><!--[if gte vml 1]></o:wrapblock><![endif]--> <span class="2SimSun30"><span style="font-size: 10.5pt;">综上所述，结合图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.1</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">和图</span></span><span class="2SimSun30"><span style="font-size: 10.5pt; font-family: SimSun;">4.2,</span></span><span class="2SimSun30"><span style="font-size: 10.5pt;">初步确定威布尔分布模型为该样本数据的 分布模型。</span></span></p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;background:transparent"> </p> <p class="210" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;background:transparent"><span class="2SimSun30"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“加工中心盘式刀库可靠性试验方法研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span></span><span style="font-size:10.5pt"><o:p></o:p></span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E6%9C%BA%E5%BA%8A' target='_blank'>数控机床</a> <a href='/index.php?case=tag&act=show&tag=%E5%88%80%E5%BA%93' target='_blank'>刀库</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div 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href='/index.php?case=tag&act=show&tag=%E5%88%80%E5%BA%93' target='_blank'>刀库</a> <small>相关内容</small></a></h3> <p></p> <span>——</span> </div> <!-- 页面标题结束 --> <hr class="featurette-divider"> <div class="container list-container"> <!-- 内容列表开始 --> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>11</span> <p>2024-12</p> </div> <h4><a title="U600S五轴加工中心视频" href="/bethel/video/show-3042.html" target="_blank">U600S五轴加工中心视频</a></h4> <p>此视频详细介绍了U600S高性能五轴加工中心各种参数及说明！… <a href="/bethel/video/show-3042.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="六角亭五轴加工工艺" href="/bethel/5-aix/show-2966.html" target="_blank">六角亭五轴加工工艺</a></h4> <p>本文以组合式六角亭模型为实例，分析工艺难点与加工可行性，指出该模型的加工难点是模型形状不规则和整体刚性差，并通过设计新的工艺方案解决加工难点，完成了模型整体的加工。新的加工工艺有助于提高加工效率和精度，为五轴数控加工提供了一个典型案例，对于五轴加工中心数控加工也具有指导作用和重要… <a href="/bethel/5-aix/show-2966.html" target="_blank">[了解更多]</a></p> 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