基于 Wiener过程的弹用电连接器温湿应力加速建模

为利用加速退化试验数据,开展可靠性评估。基于某弹用电连接器性能退化符合 Wiener过程特点进行分析,在给出电连接器性能退化模型和寿命分布函数的基础上,建立了基于 Wiener过程的弹用电连接器温湿应力加速模型,并利用 MATLAB软件给出了两步极大似然估计模型参数估计方法。为降低加速模型的复杂度,基于加速因子不变原则对加速模型的参数进行了简化。为了对模型进行检验,利用相关实例的加速试验数据,完成了参数估计并绘制了与实例进行比较的可靠度和概率密度曲线。通过对比分析,验证了所建模型的合理性,由于参数估计时考虑了 Wiener过程扩散系数及时间函数的非线性因素,计算得出的电连接器平均寿命值更为安全可靠。

Acceleration Modeling of Missile Electrical Connector with Temperature and HumidityStress Basedon Wiener Process

Inorder toconductreliability assessmentbyusingtheaccelerateddegradation testdata,based ontheanalysis that the performance degradation of a missile electrical connector conforms to the characteristics of theWiener process, andonthebasisoftheperformancedegradationmodelandlifedistributionfunctionoftheelectrical connector, thetem-peratureandhumidity stressaccelerationmodelofthemissileelectrical connectorbasedontheWienerprocessisestab-lishedand atwo-stepmaximumlikelihoodestimationmodelparameterestimationmethodisgivenbyusingMatlabsoft-ware.Inorder toreducethecomplexityoftheacceleratedmodel,theparametersoftheacceleratedmodel aresimplified basedontheprincipleofconstantaccelerationfactor.Inordertoverifythemodel,theestimationoftheparametersiscom-pletedbyusingtheaccelerated testdataofrelevantexamplesandthereliabilityandprobabilitydensity curvescompared withtheexamplesaredrawn.Throughcomparativeanalysis,therationalityoftheestablishedmodelisverified,consider-ing theWiener process diffusion coefficient and the non-linearity of time function in parameter estimation, the average lifevalueofelectricalconnectorscalculatedismoresafeandreliable.