A Study On The Acoustic Vibration Environmental Load Equivalent Method Of Solar Cell Sail Board

China's aerospace industry has obtained a significant development in recent years.However,with the pace of exploration of space accelerating,spacecraft research and development put forward higher requirements.These requirements are characterized by the key words “fast,good,economical”,which means the shortest possible development cycle,the design of a reliable enough spacecraft,and to reduce the cost of design and development and testing as much as possible.Studies showed that the spacecraft had experienced very severe environmental loads during the launch phase.In order to test the reliability of the spacecraft structure,ground tests must be carried out during the development process.According to NASA,ground test costs account for 35% of the total R&D cost,and ground acoustics is the highest cost.In addition,a large number of flexible components bring many difficulties to the ground vibration test.Substitution of different forms of load tests is a key technology to address these problems.In this paper,the kinetic characteristics of sinusoidal scanning excitation,random vibration and reverberation sound field excitation are analyzed from the small damping single-degree-of-freedom system,and the acceleration response is equivalent criterion.Sine-scan excitation and random vibration excitation,random vibration excitation and reverberation The equivalent relationship of field excitation.A method of calculating the equivalent load of sinusoidal excitation,random vibration excitation and noise excitation is proposed.Taking the solar panels of a certain type of satellite as the object,the finite element simulation model of the solar panel based on the equivalent theory is established and compared with the real structure model.The errors of the three equivalent theories and the real structure are analyzed,The equivalent mechanical model of the honeycomb sandwich panel of the battery plate is used to lay the foundation for the equivalent study of the acoustic vibration load of the solar panel.The acceleration response of solar panels under random vibration,noise excitation and equivalent excitation is studied.Based on the theory of linear fatigue damage accumulation and the S-N curve,the fatigue damage and lifetime of solar panels under the equivalent excitation were predicted and analyzed.The results show that the acceleration response error of the equivalent sinusoidal excitation is about 10%,and the acceleration response error of the equivalent random vibration is controlled at 15%,which shows the equivalent validity.In addition,it was found that the acceleration response error of the two equivalent stimuli was smaller and the minimum was 0.24 g2 when the modal damping ratio of the structure was 8%.The maximum fatigue damage of the equivalent sinusoidal excitation is 5.41 × 10-10,and the equivalent random vibration excitation is 1.13 × 10-10.The errors of the two different equivalent loads on the fatigue damage are equal to the error of the acceleration response.Fatigue damage and shortest life expectancy occur near the compression area.This shows that it is feasible to determine the equivalent between different forms of loads with the acceleration response as the equivalent evaluation parameter.