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Article

Nonlinear Vibration Isolation via a NiTiNOL Wire Rope

School of Science, Harbin Institute of Technology, Shenzhen 518055, China
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Author to whom correspondence should be addressed.
Academic Editors: Andrea Arena and Alberto Doria
Appl. Sci. 2021, 11(21), 10032; https://doi.org/10.3390/app112110032
Received: 16 July 2021 / Revised: 30 September 2021 / Accepted: 21 October 2021 / Published: 26 October 2021
Vibration isolators with both stiffness and damping nonlinearities show promise for exhibiting compound advantages for broadband vibration isolation. A nonlinear isolator with a NiTiNOL wire rope is proposed with cubic stiffness, hysteretic damping, and pinching effects induced by geometric constraints, inner frictions, and phase transitions, respectively. A combined method of a beam constraint model and a Bouc-Wen model is presented to characterize the restoring force of the NiTiNOL wire rope. The frequency responses of the nonlinear isolator were analyzed through a harmonic balance method with an alternating frequency/time domain technique. The generalized equivalent stiffness and the generalized equivalent damping ratio were defined for a comprehensive understanding of the nonlinear characteristics. The isolator exhibited a stiffness-softening-hardening characteristic. The pinching effect, the Bouc-Wen hysteresis, and the cubic stiffness mainly influenced the equivalent stiffness at the initial value, the small displacements, and the large displacements, respectively. The rate-independent damping ratio increased and then decreased with increasing displacement, and the parameters influenced the damping ratio change in different ways. Compared to an isolator with a steel wire rope, the isolator with a NiTiNOL wire rope exhibited less initial stiffness and a stronger damping effect, and thus, better vibration isolation performance. The relationships of the peak displacement transmissibility and the resonant frequency with the excitation amplitude were both non-monotonic due to the non-monotonic changes of the stiffness and the damping ratio. The minimum peak transmissibility, the lowest resonant frequency, and their corresponding excitation amplitudes depended on the isolator parameters. The isolator demonstrated stiffness–softening and stiffness–hardening types of jump phenomena with different parameters. View Full-Text
Keywords: vibration isolation; wire rope; NiTiNOL; Bouc-Wen model; pinching effect vibration isolation; wire rope; NiTiNOL; Bouc-Wen model; pinching effect
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MDPI and ACS Style

Niu, M.-Q.; Chen, L.-Q. Nonlinear Vibration Isolation via a NiTiNOL Wire Rope. Appl. Sci. 2021, 11, 10032. https://doi.org/10.3390/app112110032

AMA Style

Niu M-Q, Chen L-Q. Nonlinear Vibration Isolation via a NiTiNOL Wire Rope. Applied Sciences. 2021; 11(21):10032. https://doi.org/10.3390/app112110032

Chicago/Turabian Style

Niu, Mu-Qing, and Li-Qun Chen. 2021. "Nonlinear Vibration Isolation via a NiTiNOL Wire Rope" Applied Sciences 11, no. 21: 10032. https://doi.org/10.3390/app112110032

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