Abstract
The increase in the number of space debris is a serious threat to the safe operation of in-orbit spacecraft. The propagation law of the impact signal in the stiffened panel of the spacecraft’s sealed bulkhead is very complicated, and there is less research on the impact source location in the high-stiffened panel. In this paper, an adaptive energy compensation threshold filtering (AECTF) method based on acoustic emission is proposed, which can realize large-scale, fast and accurate locating of the impact source on the stiffened panel with less resource consumption. The influence law of the stiffeners on the lamb wave is analyzed by finite element simulation, and the Lamb wave energy factor curve is obtained. The correctness of the simulation is verified by the locating experiment on the impact point. The results show that the proposed AECTF method has better adaptability and can correctly locate the impact points in complicated locations. By selecting the appropriate frequency band to filter the signal, the locating accuracy and stability can be improved. When the frequency band is 100–200 kHz, the locating result is optimal, the average absolute error is 7.0 mm, the average relative error is 0.86%, and the error standard deviation is 3.5 mm. This study will generate fresh insight into the impact location technology of high-stiffened panel and provide a reference for the in-orbit spacecraft health monitoring system.
Highlights
With the development of aerospace industry in various countries, the number of space debris is increasing, and the safe operation of orbiting spacecraft is seriously threatened [1–6]
The coordinates of the impact points and the locating was performed by the adaptive energy compensation threshold filtering (AECTF) method
The coordinates of the impact points were were recorded as actual coordinates, and the coordinates calculated by the method were recorded as recorded as actual coordinates, and the coordinates calculated by the AECTF method were recorded calculated coordinates
Summary
With the development of aerospace industry in various countries, the number of space debris is increasing, and the safe operation of orbiting spacecraft is seriously threatened [1–6]. A honeycomb panel is provided on the outer surface of the manned spacecraft capsule, the high-speed space debris can pass through the protective layer and strike the outer surface of the spacecraft’s sealed cabin [7–9]. In order to ensure the air pressure balance and operational safety of the spacecraft, it is especially important to sense and locate the debris impact at the earliest possible moment [10–13]. Periodic stiffeners are usually provided on the outer surface of the spacecraft capsule, to ensure the sufficient mechanical strength of the spacecraft, especially the large manned spacecraft. The Lamb wave will attenuate, transmit, reflect, scatter and modal change when passing through structures such as stiffeners or defects, which increases the difficulty of locating the impact
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