3　威布尔设计法在机械产品可靠性设计中的应用3 .1　设计的主要步骤3 .1 .1　确定各零件设计参数的初始值根据机械零件的设计要求和以往经验 ,对所设计的零部件进行打样设计 ,确定其几何尺寸等有关设计参数的初始值。3 .1 .2　确定各零件的主导失效模式根据经验或利用ＦＭＥＣ 3 Weibull design method in the reliability of mechanical product design 3.1 main steps of the design 3.1.1 determine the initial value of the design parameters of each part According to the design requirements of mechanical parts and past experience, the design of the parts Proofing design, to determine its geometry and other initial design parameters. 3 .1 .2 Determine the dominant failure mode of each part based on experience or use FMEC