Research of Detecting System on Aneroid Capsule of Height Control Module of Automatic Unlocking Device

Function detecting method on height control module of automatic unlocking device for parachute are explored, principle scheme and framework of the function detecting system for height control module are developed. Intelligent testing method for displacement of aneroid capsule that is the most important key component in the height control module of automatic unlocking device is put forwarded. Displacement sensor based on differential transformer is adopted to acquire the displacement information of the aneroid capsule. Sensor testing circuit and the signal processing circuit are designed. In order to make the high altitude simulation test of displacement variability of capsule stack, experimental chamber of pressure control and test based on SCM control technique is developed, furthermore, experimental data of pressure and displacement are analyzed and processed. It is shown that accuracy of displacement is lower than 0.05mm, and pressure resolution is controlled within 0.06hPa. The detecting system can be used for reliability test for height control module of Automatic Unlocking Device, and the testing and controlling methods above can be also applied for displacement and pressure measurement of other similar mechanical components.