{"rsdb":{"rid":"201372","subhead":"","postdate":"0","aid":"142700","fid":"105","uid":"1","topic":"1","content":"
\n

 <\/p> \n

  \u4e4b\u524d\u5728\u8bbe\u8ba1\u677f\u5361\u65f6\uff0c\u53ea\u662f\u542c\u8fc7\u76f8\u5173\u7684\u6982\u5ff5\uff0c\u4f46\u662f\u672a\u771f\u6b63\u53bb\u7814\u7a76\u5173\u4e8eSI\u76f8\u5173\u7684\u77e5\u8bc6\u3002\u5c06\u4e4b\u524d\u770b\u8fc7\u7684\u4e00\u4e9b\u8d44\u6599\u6574\u7406\u5982\u4e0b\uff1a<\/p> \n

\uff081\uff09\u4fe1\u53f7\u5b8c\u6574\u6027\u5206\u6790<\/strong><\/p> \n

  \u4e0eSI\u6709\u5173\u7684\u56e0\u7d20\uff1a\u53cd\u5c04\uff0c\u4e32\u6270\uff0c\u8f90\u5c04\u3002<\/span>\u53cd\u5c04\u662f\u7531\u4e8e\u4f20\u8f93\u8def\u5f84\u4e0a\u7684\u963b\u6297\u4e0d\u5339\u914d\u5bfc\u81f4\uff1b\u4e32\u6270\u662f\u7531\u4e8e\u7ebf\u95f4\u8ddd\u5bfc\u81f4\uff1b\u8f90\u5c04\u5219\u4e0e\u9ad8\u901f\u5668\u4ef6\u672c\u8eab\u4ee5\u53caPCB\u8bbe\u8ba1\u6709\u5173\u3002<\/p> \n

\u4f20\u8f93\u7ebf\u5224\u65ad<\/strong><\/p> \n

  \u4f20\u8f93\u7ebf\u7684\u5224\u65ad\u53ef\u4ee5\u53c2\u8003\u4e4b\u524d\u7684\u535a\u5ba2\"image\"<\/a><\/strong><\/p> \n

  \u5229\u7528\u4e4b\u524d\u5224\u65ad\u9ad8\u901f\u4fe1\u53f7\u7684\u516c\u5f0f\uff0c\u6240\u4ee5\u5bf9\u4e8e\u9ad8\u901f\u548c\u4f4e\u901f\u7684\u533a\u5206\uff0c\u9700\u8981\u8003\u8651\u4fe1\u53f7\u9891\u7387\u548c\u4f20\u8f93\u8def\u5f84\u957f\u5ea6\u3002<\/p> \n

  \u5224\u65ad\u6b65\u9aa4\uff1a 1\uff09\u83b7\u5f97\u4fe1\u53f7\u7684\u6709\u6548\u9891\u7387Fknee \u548c\u8d70\u7ebf\u957f\u5ea6 L\uff1b<\/p> \n

           2\uff09\u5229\u7528Fknee \u8ba1\u7b97\u51fa\u4fe1\u53f7\u7684\u6709\u6548\u6ce2\u957f\u03bbknee\uff0c\uff0c\u5373\u03bbknee = C \/Fknee ;<\/p> \n

           3\uff09\u5224\u65adL\u4e0e1\/6 x \u03bbknee\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u82e5L > 1\/6 x \u03bbknee\uff0c\u5219\u4fe1\u53f7\u4e3a\u9ad8\u901f\u4fe1\u53f7\uff0c\u53cd\u4e4b\u4e3a \u4f4e\u901f\u4fe1\u53f7\uff1b<\/p> \n

  \u5176\u4e2d\u03bbknee  = C \/ Fknee;\u5176\u4e2dC\u662f\u6bd4\u5149\u901f\u7565\u4f4e\u7684\u901f\u5ea6\uff0cFknee = 0.5 \/ Tr(10% ~ 90%)\uff0c\u8fd8\u9700\u6ce8\u610f\u7684\u662f\uff0c\u82e5\u662f\u5bf9\u4e8e\u767e\u5146\u9891\u7387\u7684\u4fe1\u53f7\uff0c\u82e5\u662f\u6ca1\u6709\u73b0\u6210\u7684\u677f\u5b50\uff0c\u53ef\u4ee5\u5bf9\u6709\u6548\u9891\u7387Fknee\u8fdb\u884c\u4f30\u7b97\uff0c Fknee \u7ea6\u4e3a 7\u500d\u7684Fclock\uff08\u4fe1\u53f7\u7684\u5468\u671f\uff09\u3002<\/p> \n

  \u82e5L > 1\/6 x \u03bbknee\uff0c\u5219\u89c6\u4e3a\u4f20\u8f93\u7ebf\uff0c\u4f20\u8f93\u7ebf\u5fc5\u987b\u8003\u8651\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u7531\u4e8e\u963b\u6297\u4e0d\u5339\u914d\u5bfc\u81f4\u4fe1\u53f7\u7684\u53cd\u5c04\u95ee\u9898\u3002<\/p> \n

\u53cd\u5c04\u516c\u5f0f<\/strong><\/p> \n

  \u4fe1\u53f7\u7684\u53cd\u5c04\u03c1 = \uff08Z2 -Z1\uff09\/\uff08Z2 +Z1\uff09\uff1b<\/p> \n

  \u5176\u4e2dZ2 \u4e3a\u53cd\u5c04\u70b9\u4e4b\u540e\u7684\u7ebf\u8def\u963b\u6297\uff1bZ1\u4e3a\u53cd\u5c04\u4e4b\u524d\u7684\u7ebf\u8def\u963b\u6297\uff1b<\/p> \n

  \u03c1 \u7684\u53ef\u80fd\u5b58\u5728\u503c±1,0\uff0c\u5f53\u4e3a0\u65f6\u5168\u90e8\u5438\u6536\uff0c\u5f53\u4e3a±1\u65f6\u5219\u53d1\u751f\u53cd\u5c04\u3002\u4fe1\u53f7\u7684\u53cd\u5c04\u7531\u59cb\u7aef\u3001\u4f20\u8f93\u8def\u5f84\u3001\u7ec8\u7aef\u963b\u6297\u7684\u4e0d\u5339\u914d\u5bfc\u81f4\u3002<\/p> \n

\u964d\u4f4e\u53cd\u5c04\u65b9\u6cd5<\/strong><\/p> \n

  \u4e3a\u4e86\u5c3d\u53ef\u80fd\u964d\u4f4e\u4fe1\u53f7\u7684\u53cd\u5c04\uff0c\u90a3\u4e48\u9700\u8981Z2 \u548cZ1\u5c3d\u53ef\u80fd\u76f8\u8fd1\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u8fdb\u884c\u963b\u6297\u5339\u914d\uff1a\u53d1\u9001\u7aef\u4e32\u8054\u5339\u914d\uff0c\u63a5\u6536\u7aef\u5e76\u8054\u5339\u914d\uff0c\u63a5\u6536\u7aef\u5206\u538b\u5339\u914d\uff0c\u63a5\u6536\u7aef\u963b\u5bb9\u5e76\u8054\u5339\u914d\uff0c\u63a5\u6536\u7aef\u4e8c\u6781\u7ba1\u5e76\u8054\u5339\u914d\u3002<\/p> \n

\"wps35AA.tmp\"<\/a><\/p> \n

 <\/p> \n

\"image\"<\/a><\/p> \n

\"image\"<\/a><\/p> \n

\"image\"<\/a><\/p> \n

\n

3\uff09\u63a5\u6536\u7aef\u5206\u538b\u5339\u914d<\/p> \n <\/blockquote> \n

\"image\"<\/a><\/p> \n

\n

4\uff09\u63a5\u6536\u7aef\u963b\u5bb9\u5e76\u8054\u5339\u914d<\/p> \n

\u4f18\u70b9\uff1a\u529f\u8017\u8f83\u5c0f\uff1b<\/p> \n

\u7f3a\u70b9:\u5b58\u5728\u63a5\u6536\u7aef\u9ad8\u4f4e\u7535\u5e73\u4e0d\u5339\u914d\u60c5\u51b5\uff0c\u7531\u4e8e\u7535\u5bb9\u7684\u5b58\u5728\uff0c\u4f1a\u4f7f\u4fe1\u53f7\u7684\u8fb9\u6cbf\u53d8\u5316\u53d8\u7f13\u3002<\/p> \n <\/blockquote> \n

\"image\"<\/a><\/p> \n

 <\/p> \n

 <\/p> \n

 <\/p> \n

\uff082\uff09\u4fe1\u53f7\u56de\u8def<\/strong><\/p> \n

\"image\"<\/a>  \u4fe1\u53f7\u56de\u8def\u4e3b\u8981\u5305\u62ec\u4e24\u4e2a\u8def\u5f84\uff0c\u4e00\u4e2a\u662f\u9a71\u52a8\u8def\u5f84\uff0c\u4e00\u4e2a\u662f\u56de\u8def\u8def\u5f84\uff0c\u5728\u53d1\u9001\u7aef\u3001\u4f20\u8f93\u8def\u5f84\u3001\u63a5\u6536\u7aef\u6d4b\u5f97\u7684\u4fe1\u53f7\u7535\u5e73\uff0c\u5b9e\u8d28\u4e0a\u662f\u8be5\u4fe1\u53f7\u5728\u9a71\u52a8\u8def\u5f84\u548c\u8fd4\u56de\u8def\u5f84\u4e0a\u5bf9\u5e94\u4f4d\u7f6e\u7684\u7535\u538b\u503c\uff0c\u8fd9\u4e24\u6761\u8def\u5f84\u90fd\u975e\u5e38\u91cd\u8981\u3002<\/p> \n

  \u8981\u63d0\u4f9b\u5b8c\u6574\u7684\u56de\u6d41\u8def\u5f84\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p> \n

  1.\u4fe1\u53f7\u6362\u5c42\u65f6\uff0c\u6700\u597d\u4e0d\u8981\u6539\u53d8\u53c2\u8003\u5c42\uff0c\u82e5\u4fe1\u53f7\u7684\u6362\u5c42\u65f6\u4ece\u4fe1\u53f7\u5c421\u6362\u5230\u4fe1\u53f7\u5c422\uff0c\u53c2\u8003\u5c42\u90fd\u662f\u5e95\u5c421\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u8fd4\u56de\u8def\u5f84\u65e0\u9700\u6362\u5c42\uff0c\u5373\u4fe1\u53f7\u7684\u6362\u5c42\u5bf9\u5176\u53cd\u56de\u8def\u5f84\u65e0\u5f71\u54cd\u3002<\/p> \n

  2.\u4fe1\u53f7\u6362\u5c42\u65f6\uff0c\u6700\u597d\u4e0d\u6539\u53d8\u53c2\u8003\u5c42\u7684\u7f51\u7edc\u5c5e\u6027\u3002\u4e5f\u5c31\u662f\u4fe1\u53f71\u5f00\u59cb\u7684\u53c2\u8003\u5c42\u662f\u7535\u6e90\u5c421\/\u5730\u5c421\uff0c\u7ecf\u8fc7\u6362\u5c42\u4e4b\u540e\uff0c\u4fe1\u53f71\u7684\u53c2\u8003\u5c42\u662f\u7535\u6e90\u5c422\/\u5730\u5c422\uff0c\u5176\u53c2\u8003\u5c42\u7684\u7f51\u7edc\u5c5e\u6027\u672a\u53d8\uff0c\u90fd\u662fGND\u6216\u7535\u6e90\u5c5e\u6027\uff0c\u53ef\u5229\u7528\u9644\u8fd1\u7684GND\u6216\u8005\u7535\u6e90\u8fc7\u5b54\u5b9e\u73b0\u53cd\u56de\u8def\u5f84\u7684\u901a\u8def\u3002\u8fd9\u91cc\u5728\u9ad8\u901f\u60c5\u51b5\u4e0b\uff0c\u8fc7\u5b54\u7684\u5bb9\u6297\u548c\u611f\u6297\u4e5f\u662f\u4e0d\u80fd\u5ffd\u7565\u7684\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u51cf\u5c0f\u8fc7\u5b54\uff0c\u51cf\u5c0f\u8fc7\u5b54\u672c\u8eab\u4ea7\u751f\u7684\u963b\u6297\u53d8\u5316\u5f71\u54cd\uff0c\u51cf\u5c0f\u5bf9\u4fe1\u53f7\u56de\u6d41\u8def\u5f84\u7684\u5f71\u54cd\u3002<\/p> \n

  3.\u4fe1\u53f7\u6362\u5c42\u65f6\uff0c\u6700\u597d\u5728\u4fe1\u53f7\u8fc7\u5b54\u9644\u8fd1\u589e\u52a0\u4e00\u4e2a\u4e0e\u53c2\u8003\u5c42\u540c\u5c5e\u6027\u7684\u8fc7\u5b54\u3002<\/p> \n

  4.\u82e5\u6362\u5c42\u524d\u540e\uff0c\u4e24\u5c42\u53c2\u8003\u5c42\u7684\u7f51\u8def\u5c5e\u6027\u4e0d\u540c\uff0c\u8981\u6c42\u4e24\u53c2\u8003\u5c42\u76f8\u8ddd\u8f83\u8fd1\uff0c\u51cf\u5c0f\u5c42\u95f4\u963b\u6297\u548c\u8fd4\u56de\u8def\u5f84\u4e0a\u7684\u538b\u964d\u3002<\/p> \n

  5.\u5f53\u6362\u5c42\u7684\u4fe1\u53f7\u8f83\u5bc6\u96c6\u65f6\uff0c\u9644\u8fd1\u7684\u5730\u6216\u8005\u7535\u6e90\u8fc7\u5b54\u4e4b\u95f4\u5e94\u4fdd\u6301\u4e00\u5b9a\u8ddd\u79bb\uff0c\u6362\u5c42\u4fe1\u53f7\u5f88\u591a\u65f6\uff0c\u9700\u8981\u591a\u6253\u51e0\u4e2a\u5bf9\u5730\u6216\u8005\u5bf9\u7535\u6e90\u7684\u8fc7\u5b54\u3002<\/p> \n

\uff083\uff09\u4e32\u6270<\/strong><\/p> \n

  \u89e3\u51b3\u4e32\u6270\u7684\u529e\u6cd5\u662f\uff0c\u9ad8\u901f\u4fe1\u53f7\uff0c\u65f6\u949f\u4fe1\u53f7\uff0c\u5176\u4ed6\u6570\u636e\u4fe1\u53f7\u7b49\uff0c\u95f4\u8ddd\u6ee1\u8db33W\u539f\u5219\u3002<\/strong><\/p> \n

\"image\"<\/p> \n

\"image\"<\/a><\/p>\n<\/div>","orderid":"0","title":"PCB\u8bbe\u8ba1\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027","smalltitle":"","mid":"0","fname":"\u5176\u5b83","special_id":"0","bak_id":"0","info":"0","hits":"7861","pages":"1","comments":"0","posttime":"2017-10-11 17:51:18","list":"1507715478","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/article\/105\/1_zmq52__.png","ispic":"1","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"PCB<\/A> \u8bbe\u8ba1<\/A> \u4fe1\u53f7<\/A> \u5b8c\u6574\u6027<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"113.108.110.181","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"PCB\u8bbe\u8ba1\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027","lastview":"1712090342","digg_num":"8419","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}