Low Stiffness and Gap Simulation Technology Based on Negative Stiffness Principle

doi:10.11885/j.issn.1674-5086.2020.09.10.02

Abstract

Abstract: In order to solve the problem of low stiffness of support system and the difficulty of nonlinear simulation of clearance in flutter related ground tests and wind tunnel tests, the simulation technology of low stiffness and clearance is studied. By analyzing the mechanical principle of the parallel support system with positive and negative stiffness, the stiffness expression of the system and the zero stiffness condition at the equilibrium position are obtained. According to this, a parallel system with positive and negative stiffness is designed, and relevant experiments are carried out. The experimental results show that the stiffness of the system is nonlinear, and it is in good agreement with the theoretical analysis results. On this basis, the possibility of using this system to simulate the airfoil clearance of aircraft is discussed, and a clearance simulation device based on positive and negative stiffness parallel mechanism is designed. The test results show that the gap simulation device can not only simulate the gap better, but also adjust the gap size by adjusting the relevant parameters. Through this research, a new low stiffness and stiffness nonlinear support system simulation technology is explored, which can be applied to all kinds of aircraft or flutter wind tunnel models. It has good engineering applicability and application value.

Key words: negative stiffness, nonlinearity, support system, ultra-low frequency, simulation of clearance

CLC Number:

V211.47

XU Qinwei, WANG Fei. Low Stiffness and Gap Simulation Technology Based on Negative Stiffness Principle[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 119-125.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.09.10.02

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