Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

Sui, Guangdong; Zhang, Xiaofan; Hou, Shuai; Shan, Xiaobiao; Hou, Weijie; Li, Jianming

doi:10.3390/machines11050512

Cited by 2 publications

(1 citation statement)

References 63 publications

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“…These vibration protection systems have non-linear power characteristics with a quasi-zero stiffness section. Most modern systems with quasi-zero stiffness are varieties of Alabuzhev systems, in which the region with quasi-zero stiffness is obtained by adding the characteristic of the von Mises system with a region of negative stiffness to the characteristic of a spring with positive stiffness, for example, [7]. It is possible to obtain systems with quasi-zero stiffness using vibration isolators, in which an elastic element, a spring or an air spring, moves between the guides of the design form [8].…”

Section: Introductionmentioning

confidence: 99%

Vehicle suspension based on torsion bar and elastic hinge

Zotov,

Valeev,

Tokarev

2024

Liq., gas. energy resour.

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The article is devoted to the development of a vehicle suspension with a nonlinear characteristic based on a torsion bar and an elastic hinge with a given characteristic on the example of tracked vehicles for constructing oil and gas pipelines. The characteristic of the elastic hinge is such that when the existing torsion bar suspension and the elastic hinge are connected in parallel, the desired characteristic is obtained. For this non-linear characteristic in the static displacement region, low stiffness was obtained, but the total stored energy at the maximum deflection of the balance bar of the resulting suspension is greater than that of existing torsion suspensions. The smoothness of the tracked vehicles with a low stiffness of the suspension increases significantly. The calculation of vibrations of the proposed suspension under kinematic excitation was carried out. A harmonic function is considered as the trajectory of the profile; a function corresponding to a single obstacle and a function corresponding to an ascent to a ledge of a given height. The elastic hinge is a pneumatic spring moving between the guides of the design form. The force characteristic of the hinge depends on the shape of the guides and on the pressure in the air spring. The calculation of the circular shapes of the guides of the elastic hinge is given. The values of the forces arising between the pneumatic spring and the guides are determined.

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Section: Introductionmentioning

confidence: 99%

Vehicle suspension based on torsion bar and elastic hinge

Zotov,

Valeev,

Tokarev

2024

Liq., gas. energy resour.

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A Low-Frequency Vibration Isolator with Cross-Ring Structure

Han,

Niu,

Cui

et al. 2023

Int. J. Str. Stab. Dyn.

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Low-frequency vibration isolation is essential for ultra-precision manufacturing and measurement equipment. Low stiffness is beneficial for low-frequency isolation, while leading to a degradation of the load capacity of the isolator. To tackle the problem, a nonlinear isolator is proposed with a cross-ring structure, composed of a circular ring and a semi-circular ring. Experimental studies validate that the isolator is applicable to different payload mass, and a cut-off frequency of 1.1[Formula: see text]Hz is achieved for an effective isolation. The isolator is theoretically investigated to reveal the mechanism leading to the low-frequency isolation performance. An elliptic integral method is adopted to characterize the stiffness characteristics of the ring structures under compression. The whole compression process of a semi-circular ring is divided into five stages according to the deformed shapes, exhibiting quasi-linear stiffness, stiffness-softening, negative stiffness, and stiffness-hardening characteristics in sequence. Together with the stiffness-softening circular ring, the cross-ring structure demonstrates a growing high-static-low-dynamic-stiffness (HSLDS) characteristic in a wide load range, and the result is verified by a restoring force measurement test. A harmonic balance analysis is performed to predict the frequency responses of the proposed isolator. It is shown that a low-frequency isolation can be achieved with the structure compressed to the HSLDS region by the payload, and an ultra-low-frequency isolation is achieved with the dynamic-to-static stiffness ratio below 0.1. A numerical investigation is performed to further reveal the frequency responses of the isolator with lightweight/overweight payloads and excessive excitation amplitudes. Jump phenomena are presented. This work provides a prototype and the theoretical basis for low-frequency vibration isolation via a cross-ring structure.

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Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

Cited by 2 publications

References 63 publications

Vehicle suspension based on torsion bar and elastic hinge

Vehicle suspension based on torsion bar and elastic hinge

A Low-Frequency Vibration Isolator with Cross-Ring Structure

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