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| Nonlinear Vibration Characteristics of Metal Rubber Vibration Isolator Based on Average Method |
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| DOI：10.7643/issn.1672-9242.2022.09.011 |
| KeyWord:metal rubber vibration isolation nonlinear vibration averaging method jumping phenomenon |
| Author | Institution |
| YIN Yuan-xi |
Xi'an ASRIC Aviation Technology Co., Ltd., Shaanxi Xi'an , China;Key Laboratory of Aeronautical Acoustics and Vibration Aerospace Science and Technology, Shaanxi Xi'an , China |
| YANG Li |
Xi'an ASRIC Aviation Technology Co., Ltd., Shaanxi Xi'an , China;Key Laboratory of Aeronautical Acoustics and Vibration Aerospace Science and Technology, Shaanxi Xi'an , China;China Aircraft Strength Research Institute, Shaanxi Xi'an , China |
| DUAN Yu-xing |
Xi'an ASRIC Aviation Technology Co., Ltd., Shaanxi Xi'an , China;Key Laboratory of Aeronautical Acoustics and Vibration Aerospace Science and Technology, Shaanxi Xi'an , China;China Aircraft Strength Research Institute, Shaanxi Xi'an , China |
| ZHAO Jing |
Xi'an ASRIC Aviation Technology Co., Ltd., Shaanxi Xi'an , China;Key Laboratory of Aeronautical Acoustics and Vibration Aerospace Science and Technology, Shaanxi Xi'an , China |
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| Abstract: |
| In order to study the nonlinear vibration characteristics and mechanism of metal rubber vibration isolation system, the nonlinear dynamic model of the metal rubber vibration isolation system is established. The free vibration motion equation of the system and the forced vibration amplitude frequency response equation under simple harmonic excitation are derived by using the average method. The factors affecting the displacement transmissibility of the vibration isolation system are analyzed by numerical calculation. Then a compact metal rubber vibration isolator is designed, and the loading and unloading hysteresis loop is obtained through the static pressure test. The exponential stiffness model of metal rubber is established by using the fitting method. Under the same fitting effect, the parameters of the model are less. The nonlinear stiffness is brought into the vibration equation for solution, and the theoretical amplitude frequency response curve is obtained. At the same time, the sinusoidal sweep frequency experiment of the metal rubber vibration isolation system is carried out. The measured transmissibility amplitude frequency response under different vibration amplitudes is obtained and compared with the theoretical calculation results. The results show that the fitting parameters are related to the vibration characteristics of the system. The larger the fitting parameter k1, the lower the resonance frequency of the system, and the larger the fitting parameter k2, the higher the resonance frequency of the system. The maximum error between theoretical calculation and experimental results of resonance frequency is 2.1%, and the maximum error of amplification is 17.1%. This theoretical method can accurately calculate the resonance frequency, resonance amplification and jumping phenomenon of nonlinear vibration of the vibration isolation system. The method in this paper can accurately predict the nonlinear vibration characteristics of metal rubber vibration isolation system through the static pressure test data of metal rubber vibration isolator, and has certain application value for the design of metal rubber vibration isolation. |
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