An Adjustable Low-Frequency Vibration Isolation Stewart Platform Based On Electromagnetic Negative Stiffness

Wang, Min; Hu, Yingyi; Sun, Yi; Ding, Jiu; Pu, Huayan; Yuan, Shujin; Zhao, Jinglei; Peng, Yan; Xie, Shaorong; Luo, Jun

doi:10.1016/j.ijmecsci.2020.105714

Cited by 63 publications

(19 citation statements)

References 42 publications

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“…It is found that in the case of passively stable DOFs, the isolation bandwidth is reduced due to the relatively high constant stiffness, compared to the sufficiently small active stiffness provided by the optimal control in the passively unstable DOFs. Wang et al [88] proposed an adjustable electromagnetic negative stiffness Stewart platform as shown in Fig. 8(d), which could realize good stiffness match conveniently and has high vibration isolation performance in all 6 DOFs.…”

Section: Active Approachmentioning

confidence: 99%

“…The active control method can control the control current to tune the nonlinear stiffness to online control the vibration isolation performance of QZS isolators. Active control of QZS vibration isolators: (a) active-passive hybrid vibration isolator with magnetic negative stiffness [85] , (b) linear electromagnetic spring in parallel with a conventional linear isolation system [86] , (c) active 6-DOF QZS magnetic spring system [87] , (d) electromagnetic negative stiffness Stewart platform [88] , and (e) tunable HSLDS vibration isolator [89] (color online)…”

Section: Active Approachmentioning

confidence: 99%

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A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Yan

Chen

2022

Appl. Math. Mech.-Engl. Ed.

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Vibration isolation is one of the most efficient approaches to protecting host structures from harmful vibrations, especially in aerospace, mechanical, and architectural engineering, etc. Traditional linear vibration isolation is hard to meet the requirements of the loading capacity and isolation band simultaneously, which limits further engineering application, especially in the low-frequency range. In recent twenty years, the nonlinear vibration isolation technology has been widely investigated to broaden the vibration isolation band by exploiting beneficial nonlinearities. One of the most widely studied objects is the “three-spring” configured quasi-zero-stiffness (QZS) vibration isolator, which can realize the negative stiffness and high-static-low-dynamic stiffness (HSLDS) characteristics. The nonlinear vibration isolation with QZS can overcome the drawbacks of the linear one to achieve a better broadband vibration isolation performance. Due to the characteristics of fast response, strong stroke, nonlinearities, easy control, and low-cost, the nonlinear vibration with electromagnetic mechanisms has attracted attention. In this review, we focus on the basic theory, design methodology, nonlinear damping mechanism, and active control of electromagnetic QZS vibration isolators. Furthermore, we provide perspectives for further studies with electromagnetic devices to realize high-efficiency vibration isolation.

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Section: Active Approachmentioning

confidence: 99%

Section: Active Approachmentioning

confidence: 99%

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Yan

Chen

2022

Appl. Math. Mech.-Engl. Ed.

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“…e Stewart 6-DOF platform is a typical parallel mechanism, which connects the base and the moving platform through six kinematic chains and controls the movement of the platform. Because its design and research involve a series of high and new technology fields such as machinery [1], hydraulic [2][3][4], control [5], computer, signal [6], and sensor [7], it has integrated the knowledge of multiple disciplines such as electromechanical and hydraulic and has been attached great importance by the academic circles [8]. In addition, compared with the series mechanism, the platform has the advantages of stable structure and high precision [9] and is widely applied to machine tools [10], vehicles [11], medical equipment [12], sensors [13], spacecraft [14,15], telescopes [16], and other fields.…”

Section: Introductionmentioning

confidence: 99%

Parametric Vibration Analysis of a Six‐Degree‐of‐Freedom Electro‐Hydraulic Stewart Platform

Yuan

Tang

Wang

et al. 2021

Shock and Vibration

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Electro-hydraulic Stewart 6-DOF platform is a 6-DOF parallel mechanism combined with the electro-hydraulic servo control system, which is widely used in the field of construction machinery. In actual working conditions, the flow and pressure pulsation of the hydraulic oil output from the hydraulic leg of the electro-hydraulic Stewart platform are inevitable, so the equivalent stiffness of the platform leg will change, and the stiffness parameters of the transmission system will change, resulting in vibration, which will affect the accuracy of the platform. This paper considering the fluid unit equivalent stiffness cyclical fluctuations and leg, on the basis of the relationship between hydraulic stiffness, constructs the electric hydraulic Stewart platform machine vibration dynamics equation, fluid coupling parameters of vibration parameters using the method of the multiscale approximate analytic formula of the main resonance and combination resonance are derived, and the system parameters vibration time-domain response and frequency response under two different poses are discussed. Results show that the system first to six order natural frequency and the first to the sixth order natural frequency and frequency of hydraulic oil equivalent stiffness of the combination of frequency will have an effect on the parameters of the system vibration. In the main resonance, the dominant frequency is mainly the first to sixth order natural frequency of the system; in the combined resonance, the dominant frequency is the combined frequency. Through the parameter vibration analysis of two different positions of the platform, it is concluded that when the platform is in an asymmetric position, each leg of the system is more involved in vibration. This study can provide the reference for the subsequent dynamic optimization and reliability analysis of the electro-hydraulic Stewart platform.

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“…Compared with the series simulator platform, the electrohydraulic Stewart platform has the advantages of large power-to-weight ratio, large stiffness, small inertia, and high precision [1][2][3] and is currently widely used in various fields such as machine tool [4], medical equipment [5], vehicle [6,7], spacecraft [8,9], and telescope [10,11]. e design and development of the electrohydraulic Stewart platform involve multiple disciplinary fields such as machinery [12], fluid transmission and control [13,14], computer [15], and sensor [16]. e electrohydraulic Stewart platform is a multi-input multi-output system with strong coupling because its legs cooperate with each other to achieve the corresponding position and attitude in the design space.…”

Section: Introductionmentioning

confidence: 99%

Modal and Natural Frequency Sensitivity Analysis of Electrohydraulic Stewart Platform

Zhang

Zong

Tang

et al. 2021

Shock and Vibration

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Electrohydraulic Stewart platform is a multi-input and multi-output mechanical-hydraulic coupling system, which has the advantages of large power-to-weight ratio and high accuracy. It has been widely used in construction machinery, aerospace, and other fields. In the actual working process, especially in the high-speed motion, the Stewart platform movement process will produce a large impact and vibration and then affect the stability, accuracy, and service life of the platform. When the frequency of the external excitation coincides with the natural frequency of the electrohydraulic Stewart platform, it may cause the failure of the platform. Therefore, based on the relationship between the volumetric elastic modulus of the gas-bearing oil and the hydraulic stiffness of the leg, a mechanical-hydraulic coupling dynamic model of the electrohydraulic Stewart platform was established, and the natural frequencies and modal shapes of the platform were analyzed under typical conditions. The sensitivity calculation formula of the natural frequency of the system on the upper platform mass and the hydraulic stiffness of the outer leg is given by an analytical method, and the influence law of the upper platform mass and the outer leg stiffness on the natural frequency and the sensitivity of the electrohydraulic Stewart platform under typical conditions is discussed. This study can provide theoretical support for dynamic optimization of the electrohydraulic Stewart platform.

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An Adjustable Low-Frequency Vibration Isolation Stewart Platform Based On Electromagnetic Negative Stiffness

Cited by 63 publications

References 42 publications

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Parametric Vibration Analysis of a Six‐Degree‐of‐Freedom Electro‐Hydraulic Stewart Platform

Modal and Natural Frequency Sensitivity Analysis of Electrohydraulic Stewart Platform

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