Preventing Unwanted Vibrations in the Environmental Test of Random Vibrations of a Spacecraft by Power Spectrum Density Notching

Document Type : Dynamics, Vibrations, and Control

Authors

1 M.Sc., Faculty of Engineering, Kharazmi University, Tehran, Iran

2 Corresponding author: Assistant Professor, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran

Abstract

The purpose of this study is to provide a method to prevent unwanted vibrations in environmental tests of random vibrations of spacecraft. Unwanted vibrations in many environmental random vibration tests will lead to the hidden fault (hiding failure) that would be happened in operational conditions in a space mission. Hence, in this research, first, a method called the power spectrum density notching method was presented to prevent unwanted vibrations, and then, by using the obtained analytical relationships, environmental random vibration tests of a sub-orbital spacecraft were performed. After the test, the recorded results by the fixture and payload's accelerometer sensors have been analyzed. In this analysis, the performance of the power spectrum density notching method was examined. The obtained results indicate, although the power spectrum density notching method is a simple, practical, and operational method but can be an efficient method to prevent unwanted vibrations to spacecraft and also prevent damage to spacecraft during testing.

Highlights

  • The method of power spectrum density notching of random vibrations is presented.
  • The random vibration test inputs were modified based on the power spectrum density notching method.
  • Environmental tests of a sub-orbital spacecraft were carried out.

Keywords

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References

[1] Blake RE. The Need to Control the Output Impedance of Vibration and Shock Machines. Shock and Vibration and Associated Environments. 1954;23.##
[2] Scharton TD. Dual control vibration tests of flight hardware. in Institute of Environmental Sciences, Annual Technical, Pasadena. 1991.##
[3] Scharton TD. Force Limited Vibration Testing Monograph. NASA Reference Publication RP-1403, Pasadena. 1997.##
[4] Knight C  , Aglietti GS , Richardson G. Satellite Vibration Testing: Angle optimization method to Reduce Overtesting. Acta Astronautica. 2018;147:205-18.##
[5] Marchand P . Evaluation of the Force Limited Vibration Semi-Empirical Constant for a Two-Degree-of-Freedom System. AIAA Journal. 2010;48(6):1251-6.##
[6] Wijker JJ  , Boer A. Force limited random vibration testing: the computation of the semi empirical constant C2 for a real test article and unknown supporting structure. CEAS Space J. 2015;7:359-73.##
[7] Sarafin T, Doukas P, Browning M. Notching and Force Limiting," Instar Engineering and Consulting. 2017.##
[8] NASA-HDBK-7004B. 2003.##
[9] Piersol AG . Harris' Shock and Vibration Handbook: MCGraw-Hill; 2010.##
[10] Salter JP. Taming the General Purpose Vibration Test. Shock and Vibration and Associated Environments. 1964:211-7.##
[11] Wijker JJ. Miles' Equation in Random Vibrations, Theory ans Applications in Spacecraft Structures Design: Twente: Springer International Publishing; 2018.##
[12] NASA-STD-7001b. 2017.##
[13] J. Bai YQ, J. Li, H. Wang, Z. Wang. An equivalent shape-preserving clipping method for the control spectrum to avoid over-testing of triaxial random vibration. Journal of Sound and Vibration. 2021;501.##
[14] J. Bai YQ, J. Li, H. Wang, Z. Wang. A double-clipping method to achieve the fatigue damage equivalence between uniaxial and triaxial random vibrations. Fatigue & Fracture of Engineering Materials & Structures. 2022;45(9):2499-515.##
[15] L.H. Manring JFS, S.J. Zimmerman, B.P. Mann. Improving convergence of the Matrix Power Control Algorithm for random vibration testing. Mechanical Systems and Signal Processing. 2023;182.##
Aerospace Mechanics
Volume 19, Issue 1 - Serial Number 71
Serial No. 71, Spring Quarterly
June 2023
Pages 17-28

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History

  • Receive Date: 29 August 2022
  • Revise Date: 19 September 2022
  • Accept Date: 09 October 2022
  • Publish Date: 09 April 2023

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