考虑到现代电子装备的集成度和复杂度日益提高,工作环境严酷多变,将失效阈值设定为固定值往往不能反映产品的实际情况。针对该情况,将模糊数学理论引入可靠性评估中,提出了模糊可靠性的一般计算方法。并以某型雷达功能电路为例,将性能退化数据用退化量分布法进行分析,完成了模糊阈值下雷达电路板可靠性评估,并验证了该方法的有效性与合理性。 Taking into account the increasing integration of modern electronic equipment and complexity, harsh and volatile work environment, the failure threshold is set to a fixed value often can not reflect the actual situation of the product. In view of this situation, the fuzzy mathematics theory is introduced into the reliability evaluation, and the general calculation method of fuzzy reliability is proposed. Taking a certain type of radar functional circuit as an example, the performance degradation data is analyzed by degenerate quantity distribution method, and the reliability assessment of the radar circuit board under the fuzzy threshold is completed. The effectiveness and rationality of the method are verified.