Micro-vibration suppression of equipment supported on a floor incorporating magneto-rheological elastomer core

2011 ◽  
Vol 330 (18-19) ◽  
pp. 4369-4383 ◽  
Author(s):  
Y.Q. Ni ◽  
Z.G. Ying ◽  
Z.H. Chen
Keyword(s):  
Vibration Suppression ◽  
Magneto Rheological ◽  
Micro Vibration

Application of Magneto Rheological Damper on Semi-Active Suspension System

2013 ◽  
Vol 284-287 ◽  
pp. 1754-1758
Author(s):  
Yao Jung Shiao ◽  
Quang Anh Nguyen ◽  
Chun Chi Lai
Keyword(s):  
Fuzzy Logic Controller ◽  
Vibration Suppression ◽  
Active Suspension ◽  
Low Complexity ◽  
Suspension System ◽  
Light Weight ◽  
Car Suspension ◽  
Long Time ◽  
Magneto Rheological ◽  
And Control

Automotive industry is growing widely and rapidly by the involving of multi-fields not only mechanical engineering but also electrical and electronic engineering, material and more. As a key system in vehicles, suspension system and its control have been studied for a long time. A well-controlled suspension system provides high vehicle handling, good drivability and high comfort for passengers, and good isolation from road noise and vibration. To enhance comfort and handling of light-weight vehicles, semi-active suspension system is considered and proposed by numbers of papers. A semi-active suspension features small system space, low complexity and easy maintenance. Therefore, it is suitable for small compact car body known as light vehicles. This paper focuses on the analysis and control of a semi-active suspension for light-weight vehicles. Models of a quarter-car suspension with air spring and magneto rheological damper were built. Because components in the system involve nonlinear dynamic characteristics, a self-tuning Fuzzy logic controller was designed. Simulation results showed that the designed suspension system with its controller had good performance in vibration suppression.

Experimental Vibration Control of a Two-Degree of Freedom, State-Switched Absorber System

2002 ◽  
Author(s):  
Mark H. Holdhusen ◽  
Kenneth A. Cunefare
Keyword(s):  
Vibration Control ◽  
Vibration Suppression ◽  
Effective Bandwidth ◽  
Vibration Absorbers ◽  
Lumped Mass ◽  
Tuned Vibration Absorbers ◽  
Resonance Frequencies ◽  
Magneto Rheological ◽  
Theoretical Simulations ◽  
Two Degree Of Freedom

A State-Switched Absorber (SSA) is a device capable of instantaneously changing its stiffness, thus it can switch between resonance frequencies, increasing its effective bandwidth as compared to classical tuned vibration absorbers for vibration control. Previous theoretical simulations show that for a system subjected to a multi-harmonic disturbance, using an appropriate logic for switching states, the SSA reduces vibration more effectively than classical tuned vibration absorbers (TVA). This paper considers the experimental performance of the SSA for vibration suppression of an elastically mounted lumped mass base. State switching is achieved using magneto-rheological fluid to connect or disconnect a coil spring in parallel with other coil springs. The stiffness state is controlled by applying or removing a magnetic field across of the MR fluid. Experiments were performed over a range of forcing and tuning frequencies. The SSA system, optimally tuned, outperformed the optimal classical TVA system for all combinations of forcing frequencies.

Control of a shimmy vibration in vehicle steering system using a magneto-rheological damper

2016 ◽  
Vol 24 (4) ◽  
pp. 797-807 ◽  
Author(s):  
Saikat Dutta ◽  
Seung-Bok Choi
Keyword(s):  
Dynamic Model ◽  
Degrees Of Freedom ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Steering System ◽  
Sliding Mode Controller ◽  
Control Logic ◽  
Adaptive Sliding Mode Controller ◽  
System A ◽  
Magneto Rheological

Vehicle stability largely depends on the vibration of the steering system. A four degrees of freedom dynamic model of an automotive steering system with a magneto-rheological damper is presented in this study. Firstly, an equivalent mathematical model of the steering system is developed. The nonlinear equation of motion obtained from the dynamic model is then linearized around its equilibrium point to make it suitable for the design of an appropriate controller for vibration suppression. In this work, a new type of adaptive sliding mode controller is designed for control of the magneto-rheological damper and hence to control unwanted vibration. It is shown that the proposed control logic is very effective for settling steering motion near the equilibrium position. The shimmy vibrations of the wheels are reduced by a considerable amount and the steering system becomes stable. In addition, a comparative work is undertaken between the proposed controller and an ordinary sliding mode controller to demonstrate the advantage of the proposed methodology.

scholarly journals Simulation and Experimental Research on the Disturbance Behavior of a Sun-Tracking Solar Array Driven by a Stepping Motor

2021 ◽  
Vol 11 (19) ◽  
pp. 9076
Author(s):  
Jisong Yu ◽  
Yongliang Guan ◽  
Daowei Zhang ◽  
Shanbo Chen ◽  
Chunjuan Zhao ◽  
...  
Keyword(s):  
Energy Demand ◽  
Optimization Design ◽  
Vibration Suppression ◽  
System Optimization ◽  
Solar Array ◽  
Frequency Error ◽  
The Sun ◽  
Proposed Model ◽  
Micro Vibration ◽  
Disturbance Torque

A sun-tracking solar array is an effective solution to the increasing energy demand of spacecrafts. However, the driving torque fluctuation of the solar array driving assembly (SADA) and its oscillatory motion lead to the micro-vibration problem of the spacecraft. In this article, a disturbance torque model of the sun-tracking solar array, which takes its friction and flexibility into consideration, is established. Furthermore, a test platform was built to measure the disturbance force/torque, and a solar array simulator (SAS) was designed to replace the solar array in the ground experiments. Finally, the disturbance torque of the SADA-driven SAS is simulated, and the model is validated by comparing the simulation results with the experimental results. These results show that the frequency error of the model is less than 0.648%, and the amplitude error of the corresponding frequency is less than 22.33%, which indicates that the proposed model can effectively predict the disturbance torque generated by the sun-tracking solar array in orbit. The research provides theoretical guidance for the system optimization design and micro-vibration suppression of spacecrafts.

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