Abstract
The noise of the scientific experiment rack radiates into the space station through the skinned structure, which directly affects the safety and health of astronauts in orbit for a long time, so it is necessary to carry out low-noise design. Firstly, the finite element model of the panel structure is established, and the correctness of the model is verified by modal test. Secondly, select a point as the vibration excitation point on the finite element model of the plate structure to simulate the vibration input of the excitation source, obtain its vibration response through the modal superposition method, take the vibration response as the boundary condition of the acoustic boundary element, use the modal acoustic transfer vector technology to calculate the radiation noise of the plate structure, and verify it through the noise test in the half anechoic chamber. Then, the acoustic pressure contribution analysis of the radiated noise from the skinned panel structure is carried out, and the panel area which can reduce the radiated noise of the target is determined. The constrained damping layer is applied in this area. The results show that the radiated noise at the target position is significantly reduced.
Highlights
Noise is one of the important environmental factors of manned spacecraft
The accurate sound and vibration environment prediction is basis to guide the design of noise control of the space station system [4]
In order to prevent the influence of echo on the test results, the test was carried out in a half anechoic chamber, where the position of excitation point, acceleration response point and sound pressure response point were consistent with the simulation
Summary
Noise is one of the important environmental factors of manned spacecraft. Increased environmental noise of spacecraft will directly affect the communication between astronauts, interfere with astronauts’ sleep, and disturb the attention of astronauts, which may affect space missions [1]. The methods of low-frequency noise prediction in space stations are commonly used units discrete methods of acoustic finite element and acoustic boundary element [5]. Based on the structural finite element/acoustic boundary element coupling and modal acoustic transfer vector technology, this paper calculates the low-frequency radiation noise of a skinned panel structure of Scientific Experiment Rack, and conducts experimental verification; Firstly, divide the panel structure into different areas and analyze the acoustic contribution of different areas of the panel surface on the astronaut’s noise in order to determine the area that contributes positively to the radiation noise. The main function of the environmental control system of the experiment rack is to maintain the temperature and humidity of the experiment rack, which is one of the main vibration sources of the experimental racks and radiates noise through the experiment rack skinned panel structure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
