可靠性试验中通风冷却剖面的探讨

结合国家军用标准和飞机环控系统的特点对机载电子设备实际使用中的通风冷却条件进行了研究,结合产品的寿命剖面、任务剖面,针对不同任务的环境条件、飞行高度和飞行马赫数等条件,对产品在可靠性试验中通风冷却应力的施加进行了探索性研究,对现行标准中存在的问题进行了对比研究,阐述了在可靠性试验过程中如何模拟其实际使用中的通风冷却条件,制定出合理、可行的通风冷却试验剖面(包括通风气体流量、温度、湿度和洁净度等参数的确定方法).以具体产品为例,通过对产品实际使用中的通风情况进行研究,得出了其可靠性试验中与温度剖面相对应的通风冷却剖面(包括通风气体的参数以及施加的时间).

Research of ventilation cooling profile in reliability testing

The applying of the ventilation stress in the reliability test of the airborne electronic equipment were introduced. Combined with the GJB and the characteristic of the environment control system of airplane, the ventilation and cooling condition of airborne electronic equipments in factual use environment was investigated;Combined with the life profile, task profile and its environment condition, flight altitude, flight mach number, etc, the stress in reliability test and the problems in those standards in use present were investigated. The simulation of the ventilation and cooling conditions of factual environment was introduced. A ventilation and cooling profile with reason in reliability testing (including the conforming method of parameters of ventilate air—such as flux, temperature, humidity and cleanness etc) was established. Through research of a product with these items, the ventilation cooling profile (including the parameters of ventilate air and infliction time )which was compatible with the temperature profile was given.