Design and Experimental Study of a VCM-Based Stewart Parallel Mechanism Used for Active Vibration Isolation

Chi, Weichao; Cao, Dengqing; Wang, Dongwei; Tang, Jie; Nie, Yifan; Huang, Wenhu

doi:10.3390/en8088001

Cited by 30 publications

(21 citation statements)

References 22 publications

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“…Each leg of the Stewart platform is equipped with a VCM actuator as proposed in Chi et al. 12 The main part of the actuator is composed of a cylindrical permanent magnet and iron yoke, which contribute to a uniform magnetic field line normal to the gap. The moving portion of the actuator is made up of a plastic bobbin and copper wires which provide an Ampere’s force in the vertical direction perpendicular to the current flow and magnetic flux when the control current flows through it.…”

Section: Experiments Testingmentioning

confidence: 99%

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Decentralized vibration control of a voice coil motor-based Stewart parallel mechanism: Simulation and experiments

Tang

Cao

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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In pursuit of a better working performance of the precise instruments equipped in spacecraft, vibration control systems are essential for preventing them from being disturbed. This paper studies the decentralized vibration control problems of a voice coil motor-based Stewart parallel mechanism. The Newton–Euler Method is used to formulate the dynamical equations of the Stewart platform in joint space. The decentralized control theory is employed to design the controller for the linearized system. A prototype of the voice coil motor-based Stewart platform was designed and tested to validate the vibration attenuation performance of the decentralized system. The effectiveness of active vibration isolation system is revealed by both the simulation and real-time experiments.

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Section: Experiments Testingmentioning

confidence: 99%

“…Chi et al. 12 employed the H ∞ control theory to design a robust controller for the linearized system with parameter uncertainty, noise, and sensor errors.…”

Section: Introductionmentioning

confidence: 99%

Decentralized vibration control of a voice coil motor-based Stewart parallel mechanism: Simulation and experiments

Tang

Cao

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Then, the displacement of the bearing housing is: First, the stiffness damping model of the integral squeeze film bearing damper is shown in Figure 2. When it was subjected to an external force of F 0 sin(ωt), the vibration isolation function of the elastic body was analyzed [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Zhang

Yang

et al. 2019

Applied Sciences

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Featured Application: The proposed integral squeeze film bearing damper can effectively decrease the vibration of an unbalanced single-side cantilevered rotor system such as a flue gas turbine and pump. Abstract: In this paper, vibration control of an unbalanced single-side cantilevered rotor system using a novel integral squeeze film bearing damper in terms of stability, energy distribution, and vibration control is analyzed. A finite element model of such a system with an integral squeeze film bearing damper (ISFBD) is developed. The stability, energy distribution, and vibration control of the unbalanced single-side cantilevered rotor system are calculated and analyzed based on the finite element model. The stiffness of the integral squeeze film bearing damper is designed using theoretical calculation and finite element model (FEM) simulation. The influence of installation position and quantity of integral squeeze film bearing dampers on the vibration control of the unbalanced cantilevered rotor system is discussed. An experimental platform is developed to validate the vibration control effect. The results show that the installation position and quantity of the integral squeeze film bearing dampers have different effects on the stability, energy distribution, and vibration control of the unbalanced cantilevered rotor system. When ISFBDs are installed at both bearing housings, the vibration control is best, and the vibration components of the time and frequency domains have good vibration control effects in four working conditions. External excitations are mainly caused by the impact load and pulsation excitation of the fluid. When the excitation frequencies are close to the natural frequencies of the system, the resonance occurs in the system, causing unpredictable losses.With the rapid development of the single-side cantilevered rotor system, the vibration problems have become increasingly prominent. These problems pose a huge threat to safety production and economic benefits. In actual civil and military equipment, rotor systems often vibrate due to unbalance, resulting in impeller fracture, seal failure, bearing damage, valve failure, pipeline leakage, and loose foundation [6]. These faults cause equipment damage or even major safety accidents, along with unpredictable personal injury to users. So, it is necessary to control the vibration of the unbalanced single-side cantilevered rotor.The vibration mechanism of the unbalanced single-side cantilevered rotor system has already been researched by many scholars. According to the obtained theory, the vibration control of the system is divided into four types: structural modification, vibration absorption, vibration isolation, and vibration damping. At the same time, the vibration control method is divided into two types: active and passive control. Active control refers to the use of the sensor to collect signals and feedback for the controller to drive the damper to reduce vibration. Passive control refers to vibration control that can be performed without add...

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“…The main part of the VCM is composed of an iron yoke and a cylindrical permanent magnet, which can make a radially-oriented magnetic field in the air gap of the VCM. The moving part of the VCM is composed of the plastic bobbin and the wire winding, which can provide an Ampere force in the vertical direction perpendicular to the current flow and the magnetic flux when the coil is energized [21]. The spool connected directly with the slider is driven linearly by the VCM actuator.…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Pressure Pneumatic On/Off Valve with High Transient Performances Direct-Driven by Voice Coil Motor

Nie

Yin

et al. 2018

Applied Sciences

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The high-speed pneumatic on/off valve is one of the critical components in pneumatic systems, which has been widely investigated in the last decades. In this research, a new voice coil motor direct drive high-speed pneumatic on/off valve (VCM-DHPV) is proposed, and the mathematical model of VCM-DHPV, which consists of the fluid subsystem and electro-mechanical subsystem, is established. In addition, the key structural parameters of VCM-DHPV are optimized through the simulation analysis to improve its dynamic performance. The experiment results show that the developed VCM-DHPV has a good sealing performance by adopting the face-seal type in the valve port, and a large flow rate up to 5500 L/min, and its opening response time is 8.2 ms under the gas supply pressure of 8 MPa and exiting voltage of 240 V. With the supply pressure and the exciting voltage rising, the opening response time of VCM-DHPV is gradually increasing, and the variation tendency of the spool displacement curves is in accordance with the simulation results. This research will have significantly effects on raising the performance of the high-speed pneumatic on/off valve and the development of pneumatic precision motion control.

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Design and Experimental Study of a VCM-Based Stewart Parallel Mechanism Used for Active Vibration Isolation

Cited by 30 publications

References 22 publications

Decentralized vibration control of a voice coil motor-based Stewart parallel mechanism: Simulation and experiments

Decentralized vibration control of a voice coil motor-based Stewart parallel mechanism: Simulation and experiments

Vibration Control of an Unbalanced Single-Side Cantilevered Rotor System with a Novel Integral Squeeze Film Bearing Damper

Development of a High-Pressure Pneumatic On/Off Valve with High Transient Performances Direct-Driven by Voice Coil Motor

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