第四章機(jī)械可靠性設(shè)計(jì)原理與可靠度計(jì)算

1、 SSSSn許用計(jì)算極限計(jì)算 nsssfS, 21nsss, 21ng,21n,21SSSSAFAAFFAF, RSPtR)()( nn RSPtRnsssfs, 21ng,21ijS0ZS(0)RP Z g1 1數(shù)值積分法數(shù)值積分法2 2應(yīng)力應(yīng)力- -強(qiáng)度干涉模型求可靠度強(qiáng)度干涉模型求可靠度( )()(0)1R tPSPSPS 11dd,22SSSS11111dd()d22SSP SSSf SSA 211AdgsPs1121d()d( )dSRA Af SSg ()1( )( )dd1( )1( )d( ) ( )dSFPSf SgSf SGSSGS f SS 11dd,2211111dd(

2、)d22PgA112()( )dP Sf SSA1121d()d( )dRA Agf SS ( )d( )( )ddR tRgf SS ()1( )( )dd1( )( )d1( ) ( )dSSFP Sgf SSgFFg ( )()(0)1NR tP NnP NnPn( )( )()ddnR tf nf NNn 3功能密度函數(shù)積分法求解可靠度功能密度函數(shù)積分法求解可靠度12( ,)nZSf z zz0(0)( )dRP Zf ZZ 4 4蒙特卡洛（蒙特卡洛（Monte CarloMonte Carlo）模擬法）模擬法211( )exp()22SSSSf SS211( )exp()22gSSy

3、S22yS 211( )exp()22yyyyh yy2011(0)expd22yyyyRP yyyyyz220ySySz z + 2222110expdexpd2222ySySzzRP yzz222211expdexpd()2222SRSZRzzRzz22ySRySZz ： 2(180,22.5 )N2(130,13 )SN 22221801301.92422.513SRSZ ()(1.924)0.9728RRZ 22221801302.6181413SRSZ ()(2.618)0.995 6RRZ ： 2lnlnln11exp(00 +)( )220(0)xxxxf xxx，-ln xln

4、 x2lnlnln(,)SSSN2lnlnln(,)N lnlnlnySSyylnlnyS22lnlnyS 1lnln00RPSPPSP ySlnln22lnln2lnln22lnln1expd()22SSSRSzRzZ2ln2lnlnlnSSZ2ln2lnlnlnSSRZ。lnln Slnln SSS2lnlnln22222lnln1ln1CClnln222lnln2ln1SSSSSSSClnln2222lnlnlnlnSSRSSZCClnln22lnln2lnln22lnln1expd()22SSSRSzRzZ22lnlnlnln2222lnln1lnln()2SSSRSSZCC 1111

5、()( )d( )d()nnR nf nnf nnZ1n1n11lgnn 11NNnZNN111()( , )()R nnR n nR n79. 1201060100222ln2lnlnlnSSRZ96327. 079. 1RMpaZsSSR5 . 1ln2ln2lnlnln 111( , )0.6535( , )0.770 2()0.8485R n nR n nR n( )e(0)SSSf SS( )e(0)g 1( )d( )( )ddSR tRf SgS00()()00()( )( )ddeeded(+)edSSSSSSSSSSSSSSSRPSf SgSSSSSRMpa3300Mpas2

6、000623. 0200033003300SR10010000( )exp()SSmmSSSSSSSmf SSSSSS1000000( )exp()mmmg1000( )exp()SSmmSSSSmSSSSf SSS1000( )exp()mmmg0SSS0 dgFFs1 01000()1( ) ( )dexpexpdSSmmmSFP SFgSm令 0my11/00ddmmmyy，1/000()expdSmmSSSFP Syyy SSn2121222221SSsn22222222211SSSnnSSSSZ2221222211111ZZZnS2122SZn719. 16 .175 .2609. 323523521222122SZnMpaSMpa5 .26,235MpaMpaSS6 .17,137293. 05 .261376 .172351371121222222122222SSSnNNFF100,120022