Analytical study of a pneumatic vibration isolation platform featuring adjustable stiffness

Vo, Ngoc Yen Phuong; Ky, Nguyen Minh; Le, Thanh Danh

doi:10.1016/j.cnsns.2021.105775

Cited by 27 publications

(4 citation statements)

References 27 publications

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“…A new parabolic cam-roller is designed and used in QZS isolator, and some important theoretical equations are given and the conditions for QZS characteristics are obtained [12]. In addition, CRSM also can be used as negative stiffness mechanism [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Research on a Novel CRSM for a Type of QZS Vibration Isolator

Wei

2024

J. Phys.: Conf. Ser.

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Quasi-zero stiffness is usually abbreviated as QZS. This kind of QZS isolator has a negative stiffness mechanism, which is usually a spring mechanism (NSSM), thus possessing excellent isolation performance. However, it is prone to instability under low-frequency and large amplitude excitation. In response to this situation, a novel type of cam and roller spring mechanism (CRSM) is designed. This mechanism is composed of an arc-shaped groove, a rolling element, a spring, and a sliding pair. Use the combination of CRSM and NSSM to improve the stability of QZS isolators and prevent instability. Under two typical excitations, simulation tests in SIMULINK are conducted to analyze the vibration attenuation performance of the improved isolator and the role of CRSM in improving stability. The conclusion is that CRSM can greatly improve stability without reducing vibration damping performance.

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Section: Introductionmentioning

confidence: 99%

Research on a Novel CRSM for a Type of QZS Vibration Isolator

Wei

2024

J. Phys.: Conf. Ser.

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“…Pneumatic springs were widely used in demanding application fields such as optical instruments [1], nanofabrication equipments [2,3], semiconductor manufacturing [4] and vehicle suspension [5][6][7][8]. Due to their excellent performance of high load capacity and low dynamic stiffness, which can reduce the displacement of precision systems under static loads while enhance low-frequency vibration isolation performance.…”

Section: Introductionmentioning

confidence: 99%

The stiffness of elastomeric diaphragm in pneumatic springs

Bai,

Che,

et al. 2024

J. Phys.: Conf. Ser.

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The design of pneumatic springs applied in precision vibration isolation platforms requires an accurate mathematical model. Many validation experiments have shown that neglecting the effect of the diaphragm on the response of a isolator can lead to a significant error between the observed and predicted behavior. This paper modifies the standard pneumatic spring model by considering the effects of the diaphragm on stiffness. A theoretical model for diaphragm stiffness is presented. The model equates the inner and outer rings of the diaphragm into two segments of composite material subjected to unidirectional stretching. The elastic modulus and stiffness of each part of anisotropic materials were obtained using the theory of composite mechanics, combined with the working conditions of the diaphragm. Finally, the dynamic stiffness experimental platform was built to verify theoretical model. The result indicates that considering the stiffness of elastomeric diaphragm, the error is reduced from 27.33% to 7.5%.

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“…An isolator composed of repelling magnets was tested under the excitation amplitude of 1 mm in Oyelade (2020). Harmonic excitation with amplitude of 10 mm was numerically simulated to obtain the amplitude frequency response curve of the pneumatic vibration isolation platform in Vo et al (2021). A QZS isolator based on the cam mechanism with user-defined profile was designed with the horizontal length of 138 mm and tested under the excitation amplitude of less than 3 mm Li et al (2021).…”

Section: Introductionmentioning

confidence: 99%

Enhanced design of the quasi-zero stiffness vibration isolator with three pairs of oblique springs: Theory and experiment

Zhao

Cao

Luo

et al. 2022

Journal of Vibration and Control

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Quasi-zero stiffness vibration isolators have been extensively studied due to superior passive vibration isolation performance. As the quasi-zero stiffness region of the isolators is generally small, the research on their responses to the excitation with high amplitude is currently quite limited. This paper presents an improved design of the quasi-zero stiffness isolator with three pairs of oblique springs to increase the amplitude of the excitation. Theoretical formulations are derived for stiffness and force, and then the influences of three independent parameters on the quasi-zero stiffness region are studied to obtain optimal design parameters. A prototype is fabricated and tested for displacement excitations with amplitudes of 5 mm, 10 mm, and 15 mm in a frequency range of 1.5–10 Hz. The absolute displacement transmissibility of the enhanced quasi-zero stiffness isolator is theoretically and experimentally compared with that of the corresponding linear isolator and that of the previous isolators with three pairs of oblique springs using the same parameter conditions of the loaded mass, the horizontal length of oblique springs, and the vertical spring. The experimental results show that the enhanced design of the quasi-zero stiffness isolator with three pairs of oblique springs can achieve lower displacement transmissibility and deal with the displacement excitation with higher amplitude.

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Analytical study of a pneumatic vibration isolation platform featuring adjustable stiffness

Cited by 27 publications

References 27 publications

Research on a Novel CRSM for a Type of QZS Vibration Isolator

Research on a Novel CRSM for a Type of QZS Vibration Isolator

The stiffness of elastomeric diaphragm in pneumatic springs

Enhanced design of the quasi-zero stiffness vibration isolator with three pairs of oblique springs: Theory and experiment

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