Highly accelerated stress test method of angular displacement sensor

Abstract

The invention relates to the reliability test technology of an angular displacement sensor, in particular to a highly accelerated stress test method of an angular displacement sensor. The method is characterized in that high-temperature working limit and low-temperature working limit are determined through high-temperature and low-temperature stepping assessment, vibration working limit is determined through vibration stepping assessment, and the high-temperature working limit, the low-temperature working limit and the vibration working limit provide reliability assessment to the design parameters of the angular displacement sensor; the temperature lower limit in the test is lowered from -45 DEG C to -90 DEG C, the temperature upper limit is increased from 70 DEG C to 135 DEG C, temperature change rate is increased from 10 DEG C / min to 40 DEG C / min, vibration load is changed from single axis to three-axial-direction six-freedom-degree excitation, reliability assessment requirements of the angular displacement sensor are increased, time of the reliability test can be reduced correspondingly, and a new approach is provided to the reliability test method of highly accelerated stress.

Description

technical field [0001] The invention relates to the technical field of reliability testing of devices, in particular to the technical field of reliability testing of angular displacement sensors. Background technique [0002] In the fly-by-wire flight control system, there is a key component of the angular displacement sensor, which is mainly used in the linear / rotary motion system, provides the linear / angular position voltage signal, and transmits the voltage signal to the computer to realize Position measurement and feedback. The output voltage and insulation resistance of the angular displacement sensor are important parameters that mark whether the product is qualified. After the processing of the sensor is completed and its output voltage and insulation resistance are tested to be qualified, a reliability assessment test is required before delivery for installation. [0003] The usual assessment test method is: keep warm at the low temperature working limit of -55°C f...

AI Technical Summary

Problems solved by technology

Therefore, there are problems such as narrow temperature range, low temperature change rate, short holding time at the working limit temperature, and the use of single-axis random vibration, which leads to insufficient exposure of the hidden danger of angular displacement sensor failure, making the original test method assessment There will be a gap between the final test and the actual assessment. Even if the above-mentioned reliability test is passed, the failure rate of the actual assessment is still high.