基于加速退化模型的卫星组件寿命与可靠性评估方法

针对卫星产品长寿命、高可靠性的特点,提出了使用加速退化试验的方法来评估卫星用微波接收机的寿命与可靠性指标.首先,在确定微波接收机关键模块与相应失效机理的基础上,选择了适用的加速模型.然后,通过分析产品性能的实际退化过程,选择漂移布朗运动对此进行拟合,并结合漂移布朗运动首达时(first passage time)服从逆高斯分布的特点,建立了产品的可靠性模型.最后,采用极大似然结合最小二乘的评估方法,对该关键模块的恒定应力加速退化试验的蒙特卡罗仿真结果,进行了产品的寿命与可靠性评估并且得到了合理的结果,从而验证了本文方法的正确性.

Constant-stress Accelerated Degradation Testing of Satellite Assemblies

High reliability satellite requires the extremely high reliable assemblies over a long period of time. Within severe time constraints, this paper utilizes the accelerated degradation testing to evaluate their reliability and life. Firstly, the critical functional modular and its degraded failure mechanism of microwave radiometer Imager (MWRI) are analyzed to determine,the its accelerated model. Then, by modeling the degradation process as a drift Brown Motion of which the first passage time follows inverse Gaussian distribution, this paper generated the reliability model of the critical functional modular. Finally, the maximum likelihood combined with least square of accelerated degradation testing data is used to estimate the data from Monte Carlo simulation. The methodology in this paper is demonstrated and validated by reasonability of estimation of virtual HEMT.