HALT试验高效率振动剖面的建立

Optimization of Vibration Profile for Highly Accelerated Life Test

HALT(Highly Accelerated Life Test,高加速寿命试验)是一项新的可靠性试验技术,具体实施还缺乏系统的理论指导。针对HALT试验中的振动激励应力,采用Matlab/Simulink仿真分析了试件在频谱可控的超高斯振动激励作用下的响应特点,研究了HALT试验振动激励剖面参数(带宽、均方根值、峭度)以及试件本身动力学特性(固有频率、阻尼)对试件响应特性(带宽、均方根值、峭度)的影响,进而给出了理论解释。最后归纳了HALT试验高效率振动剖面的建立方法,并以典型印制电路板为例进行了试验验证。结果表明本文提出的方法是有效的。

HALT is a new technique for reliability test, but there is few theoretical guidance on how to determine the efficient vibration profile at present. In allusion to the vibration stress in HALT, this paper first simulates the response of the specimen subjected to the vibration excitation with super-gaussian probability distribution and an alterable power spectral density using Matlab/Simulink. Then the influence of the vibration excitation profile parameters （e. g. excitation bandwidth, excitation kurtosis and the root of mean square of excitation） and the dynamical characteristic of the specimen itself （e. g. natural frequencies and damping ratio of the product under test） on the response characteristic of the specimen （e. g. response bandwidth, response kurtosis and the root of mean square of response） is studied, and theoretical explanation is given for the simulation results. At last, the method of designing the optimal vibration profile is summarized and validated by experiments on PCBs which play a critical role in electronic equipment. The results show that the method of this paper is well practical.