Abstract
Purpose
This paper proposes a novel dual four-rod horizontal large-amplitude quasi-zero stiffness (QZS) vibration isolator based on the singular configuration of a planar four-rod mechanism combined with gravity compensation.
Methods
First, the mechanism design and three-dimensional model of dual four-rod horizontal vibration isolator are established. Second, kinematic characteristics are analyzed, and trajectory planning is carried out to obtain the kinematic performance. Then, based on the artificial fish swarm algorithm, the appropriate size and mass of the component are solved, and the QZS characteristics of the isolator are optimized. Third, the statics and dynamics theoretical models of isolators are established, and the transmissibility of isolators under different dam** ratios and excitation amplitudes is solved by simulation experiments. Finally, the experimental prototype is established, and the experiment of resilience and acceleration transmissibility is carried out to verify the effectiveness of low-frequency vibration isolation.
Results
The static and dynamic simulation analysis of isolator well verifies the theoretical solution of isolator. According to the theoretical model, different vibration isolation performance can be obtained with different input parameters. The experimental results of the prototype show that the isolator has lower initial vibration isolation frequency and wider vibration isolation bandwidth.
Conclusion
The dual four-rod horizontal large-amplitude QZS isolator designed in this paper shows good performance in isolating the external excitation of the low-frequency large vibration amplitude. Since the medical precision instrument will inevitably produce low-frequency vibration during the transportation process and reduce the accuracy and stability of the equipment, in order to reduce the possibility of the instrument being damaged during the transportation process, the vibration isolator has great application potential in the isolation of medical precision instrument.
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Funding
This research was funded by the National Natural Science Foundation, China (Grant no. 52105009), by the Project of Shenzhen Municipal Science and Technology Innovation Council (Grant no. KCXFZ20201221173202007), by the Key Scientific Research Platforms and Projects of Guangdong Regular Institutions of Higher Education, China (Grant no. 2022KCXTD033), by the Scientific Research Capacity Improvement Project of Key Develo** Disciplines in Guangdong Province, China (Grant no. 2021ZDJS084), by the Guangdong Natural Science Foundation, China (Grant no. 2023A1515012103), by the Key Laboratory of Robotics and Intelligent Equipment of Guangdong Regular Institutions of Higher Education, China (Grant no. 2017KSYS009), and by the Innovation Center of Robotics and Intelligent Equipment, China (Grant no. KCYCXPT2017006).
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Conceptualization, SW, LY, QZ and RX; methodology, SW, LY and QZ; software, SW and LY; validation, SW and LY; investigation, SW, QZ; data curation, SW, LY and QZ; writing—original draft preparation, SW and LY; writing—review and editing, SW, LY and QZ; visualization, SW; supervision, QZ, RX; project administration, QZ, RX; funding acquisition, QZ. All the authors have read and agreed to the published version of the manuscript.
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Wang, S., Yu, L., Zhang, Q. et al. Design and Analysis of a Novel Horizontal Large-Amplitude and Low-Frequency Vibration Isolator. J. Vib. Eng. Technol. 12, 6155–6167 (2024). https://doi.org/10.1007/s42417-023-01244-5
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DOI: https://doi.org/10.1007/s42417-023-01244-5