Research on Longitudinal High Load-bearing Quasi-zero Stiffness Isolator for Propulsion Shafting

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Research on Longitudinal High Load-bearing Quasi-zero Stiffness Isolator for Propulsion Shafting

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[1]REN Zhiying,QIU Tao,LIU Niuniu,et al.Research on Longitudinal High Load-bearing Quasi-zero Stiffness Isolator for Propulsion Shafting[J].Journal of Zhengzhou University (Engineering Science),2023,44(01):52-57.[doi:10.13705/j.issn.1671-6833.2022.04.019]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 01 Page number: 52-57 Column: Public date: 2022-12-06

Title:: Research on Longitudinal High Load-bearing Quasi-zero Stiffness Isolator for Propulsion Shafting

Author(s):: REN Zhiying¹; 2; QIU Tao¹; 2; LIU Niuniu¹; 2; BAI Hongbai¹; 2; YAO Jiecheng¹; 2; LIANG Yi¹; 2; 1.School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China; 2.Institute of Metal Rubber, Vibration and Noise, Fuzhou University, Fuzhou 350116, China

Keywords:: propulsion shafting; low frequency vibration isolation; disc spring; quasi-zero stiffness; stability

CLC:: TH113. 1

DOI:: 10.13705/j.issn.1671-6833.2022.04.019

Abstract:: Aiming at the problem of longitudinal low-frequency vibration isolation of ship propulsion shafting, a high-load quasi-zero stiffness isolator was designed based on disc spring with negative stiffness characteristics and positive-stiffness coil spring in parallel. The dynamic equation of the shafting-quasi-zero stiffness vibration isolation system was established. Through the harmonic balance method, the steady-state response of the system was solved, and the validity of the solution was verified by numerical calculation. For the problem of system response stability, firstly, the influence of nonlinear stiffness of quasi-zero stiffness isolator and external excitation force amplitude on response stability were studied，and combined with the longitudinal static deformation of the shafting, the nonlinear stiffness was determined. Then the specific structural and mechanical parameters of the disc spring and the coil spring were obtained through static analysis. Finally, the influence of damping ratio of quasi-zero stiffness isolator and external excitation force amplitude on the response stability of the system were analyzed, the damping ratio was determined. The results showed that when the nonlinear stiffness and damping ratio were taken as 1×1012 N/m3 and 0.05, respectively, the main resonance of the system no longer jumps, and the solution of the steady-state response of the system was stable within 200 Hz. In the meantime, even with a load of 10 000 N, the quasi-zero stiffness isolator could still effectively isolate the vibration in the range of 10 Hz to 200 Hz.

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