电子功能部件环境适应性试验优化设计

doi:10.3969/j.issn.1001-506X.2020.07.27

摘要/Abstract

摘要：

针对高可靠性、长寿命的电子功能部件环境适应性评估问题,基于蒙特卡罗仿真方法,本文评估定数截尾步降应力实验方案并进行仿真优化设计。以服从威布尔分布的电子功能部件寿命模型为基础,以环境温度为主要应力参数,以提高实验效率和降低实验代价为目的,结合相关失效模型,建立实验方案优化度评估函数。优化度评估函数的建立使得环境适应性实验方案由定性分析转变为定量分析,且最优实验方案具备更高的时效性和精确度,相对于一般的经验方案而言,能够提升44.8%的优化度。

关键词: 蒙特卡罗, 环境适应性实验, 精确度, 时效性, 优化度

Abstract:

In order to evaluate the environmental adaptability of high-reliability and long-life electronic functional equipment, based on Monte Carlo simulation method, the fixed-censored step stress reduction test scheme is evaluated, and the simulation optimization is designed. Based on the electronic functional equipment's life-span model which obeys Weibull distribution, the environmental temperature is the main stress parameter, and the purpose of improving test efficiency and reducing test cost is combined with related failure models to establish the evaluation function of the test plan optimization. The establishment of the optimization degree evaluation function makes the environmental adaptability test scheme changing from qualitative analysis to quantitative analysis, and the optimal test scheme has higher timeliness and accuracy, which can obtain 44.8% on optimization compared with the general experience scheme.

Key words: Monte Carlo, environmental adaptability test, accuracy, timeliness, optimization

中图分类号:

TJ760.6

吕卫民, 李永强. 电子功能部件环境适应性试验优化设计[J]. 系统工程与电子技术, 2020, 42(7): 1630-1636.

Weimin LYU, Yongqiang LI. Electronic functional equipment environmental adaptability test optimal design[J]. Systems Engineering and Electronics, 2020, 42(7): 1630-1636.

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参数符号	参数含义	取值	获取途径
ε	疲劳韧性因子	0.325	材料参数
α	电子功能部件热膨胀系数/(l/k)	4.8×10^-6	材料参数
L	器件边缘长度/mm	20	设计参数
h	器件高度/mm	2	设计参数
C	内置校准因子	0.13	工程实际
F	经验修正因子	0.72	工程实际
T	电子功能部件环境温度/℃	自设	应力参数
t_d	高温持续时间/h	24	应力参数
S	加速寿命	循环数	计算值

环境温度/℃	失效数据个数	失效时寿命/h
40	10	15 270, 20 844, 18 774, 15 574, 17 910 14 590, 20 847, 17 157, 15 274, 19 054

实验结果	应力水平(/℃)及参数
	50		60		70		80		90		100
	m₁	η₁	m₂	η₂	m₃	η₃	m₄	η₄	m₅	η₅	m₆	η₆
实验数据	3.10	14 010	3.10	11 667	3.10	10 023	3.10	8 762	3.10	7 762	3.10	6 987
仿真结果	3.08	13 975	3.05	11 514	3.02	9 686	2.98	8 347	2.93	7 321	2.85	6 426
误差	0.65%	0.25%	1.61%	1.31%	2.6%	3.36%	3.87%	4.74%	5.48%	5.68%	8.06%	8.03%

实验结果	截尾数及参数
	10		30		50		70		90
	m₁	η₁	m₂	η₂	m₃	η₃	m₄	η₄	m₅	η₅
实验数据	3.10	17 528	3.10	17 528	3.10	17 528	3.10	17 528	3.10	17 528
仿真结果	2.89	16 236	2.93	16 560	2.99	16 846	3.03	17 120	3.05	17 259
误差	6.77%	7.37%	5.48%	5.52%	3.55%	3.89%	2.26%	2.32%	1.61%	1.53%

寿命误差	应力水平/℃
	50		70		90
	截尾数		截尾数		截尾数
	10	30	30	50	50	70
取值/%	4.88	4.15	4.57	3.72	4.99	3.83