Passive and Active Vibration Isolation Methods in Discrete Mechatronic Systems

Piezoelectric actuators are more and more common in many different technical and precision industries. Mechatronic systems which combine them with mechanical models and steering recently are used in plenty practical applications. In this paper, discrete mechatronic systems have been compared relating to known passive vibration isolation method and active that has been additionally introduced to considered systems. Requirements for the systems have been given in form of poles and zeros. Basing on amplitude response functions and dynamical flexibilities, damping performance in both cases has been investigated.

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Effects and Prospects of the Vibration Isolation Methods for an Atomic Interference Gravimeter

Sensors ◽

10.3390/s22020583 ◽

2022 ◽

Vol 22 (2) ◽

pp. 583

Author(s):

Wenbin Gong ◽

An Li ◽

Chunfu Huang ◽

Hao Che ◽

Chengxu Feng ◽

...

Keyword(s):

Vibration Isolation ◽

Prospective Development ◽

Passive Vibration Isolation ◽

Isolation Methods ◽

Challenging Environment ◽

Research Findings ◽

Active Vibration ◽

Vibration Compensation ◽

Atomic Interference ◽

Vibration Noise

An atomic interference gravimeter (AIG) is of great value in underwater aided navigation, but one of the constraints on its accuracy is vibration noise. For this reason, technology must be developed for its vibration isolation. Up to now, three methods have mainly been employed to suppress the vibration noise of an AIG, including passive vibration isolation, active vibration isolation and vibration compensation. This paper presents a study on how vibration noise affects the measurement of an AIG, a review of the research findings regarding the reduction of its vibration, and the prospective development of vibration isolation technology for an AIG. Along with the development of small and movable AIGs, vibration isolation technology will be better adapted to the challenging environment and be strongly resistant to disturbance in the future.

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Tilt Active Vibration Isolation Using Vertical Pendulum and Piezoelectric Transducer with Parallel Controller

Applied Sciences ◽

10.3390/app11104526 ◽

2021 ◽

Vol 11 (10) ◽

pp. 4526

Author(s):

Lihua Wu ◽

Yu Huang ◽

Dequan Li

Keyword(s):

Piezoelectric Transducer ◽

Vibration Isolation ◽

Vertical Vibration ◽

Open Loop ◽

Negative Effects ◽

Voltage Controller ◽

Hysteresis Nonlinearity ◽

Passive Vibration Isolation ◽

Active Vibration ◽

Active Vibration Isolation

Tilt vibrations inevitably have negative effects on some precise engineering even after applying horizontal and vertical vibration isolations. It is difficult to adopt a traditional passive vibration isolation (PVI) scheme to realize tilt vibration isolation. In this paper, we present and develop a tilt active vibration isolation (AVI) device using a vertical pendulum (VP) tiltmeter and a piezoelectric transducer (PZT). The potential resolution of the VP is dependent on the mechanical thermal noise in the frequency bandwidth of about 0.0265 nrad, which need not be considered because it is far below the ground tilt of the laboratory. The tilt sensitivity of the device in an open-loop mode, investigated experimentally using a voltage controller, is found to be (1.63±0.11)×105 V/rad. To compensate for the hysteresis nonlinearity of the PZT, we experimentally established the multi-loop mathematical model of hysteresis, and designed a parallel controller consisting of both a hysteresis inverse model predictor and a digital proportional–integral–differential (PID) adjuster. Finally, the response of the device working in close-loop mode to the tilt vibration was tested experimentally, and the tilt AVI device showed a good vibration isolation performance, which can remarkably reduce the tilt vibration, for example, from 6.0131 μrad to below 0.0103 μrad.

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Retrofitting Active Control into Passive Vibration Isolation Systems

Journal of Vibration and Acoustics ◽

10.1115/1.2893791 ◽

1998 ◽

Vol 120 (1) ◽

pp. 104-110 ◽

Cited By ~ 12

Author(s):

D. Margolis

Keyword(s):

Vibration Isolation ◽

Vibrational Energy ◽

Control Strategies ◽

Active Vibration Control ◽

Active System ◽

External Disturbances ◽

Passive Vibration Isolation ◽

Active Vibration ◽

Excellent Control ◽

Isolation Systems

Active vibration control uses sensing and power actuators to attenuate vibrational energy due to external disturbances. Many of these systems are retrofitted into already existing passive ones. As a result allowable relative motions are prescribed, and this influences the performance of the active system. This paper exposes these limitations and shows realistic expectations for two excellent control strategies.

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Active vibration suppression of a beam using piezoeffect

E3S Web of Conferences ◽

10.1051/e3sconf/20199703024 ◽

2019 ◽

Vol 97 ◽

pp. 03024

Author(s):

Nelly Rogacheva

Keyword(s):

Vibration Isolation ◽

Vibration Suppression ◽

External Energy ◽

Active Systems ◽

Vibration Isolators ◽

Active Vibration Suppression ◽

Passive Vibration Isolation ◽

Protected Object ◽

Active Vibration ◽

Isolation Systems

Operation of structures and equipment in dynamic conditions led to the problems of vibration isolation and vibration suppression. For vibration isolation and vibration suppression passive, active systems and their combinations are used. Passive vibration isolation usually consists in the fact that the protected object relies on extremely dimensional springs and vibration isolators. Vibration isolation systems containing only passive elastic and damping elements are called passive. Active vibration isolation and vibration damping systems use external energy sources. These are pneumatic, hydropneumatic and hydromechanical devices. Recently, electro-elastic and magneto-elastic systems [1], [2] began to be used for vibration isolation and active vibration suppression. As a rule, the analysis of the work of such systems consists in the development of an experimental layout and a schematic diagram. In this paper, a mathematically based model is used to solve the problem in question. The calculations are performed and the results are presented in the form of graphs.

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Optimized Fuzzy Neural Networks Control of a Magnetic Suspension Vibration Isolation System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.226-228.328 ◽

2012 ◽

Vol 226-228 ◽

pp. 328-334

Author(s):

Chun Sheng Song ◽

Ye Fa Hu

Keyword(s):

Neural Networks ◽

Vibration Isolation ◽

Fuzzy Neural Networks ◽

Magnetic Suspension ◽

Isolation System ◽

Vibration Isolation System ◽

Passive Vibration Isolation ◽

Fuzzy Neural ◽

Active Vibration ◽

Active Vibration Isolation

Active vibration isolation technology can overcome the defects of passive vibration isolation technology that the poor vibration isolation performance in low and resonant frequencies. Compared with other active vibration isolation technologies, magnetic suspension isolation technology has shown useful characteristics, such as wide response frequency range, fast response, high reliability and long-life. However, the control of MSVI is still one of the areas that require further investigation. This paper presents a Fuzzy Neural Networks(FNN) control algorithm for a magnetic suspension isolation vibration system, which is optimized by improved Genetic Algorithm(GA). The output force responses of the FNN and passive vibration isolation system under same excitation are simulated. The simulation results show that the fuzzy control system has much better performance in vibration isolation.

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