Parallel Vibration Isolation Platform Using Magnetorheological Technology

2014 ◽  
Vol 574 ◽  
pp. 596-602 ◽  
Author(s):  
Qiang Wang ◽  
Zhao Bo Chen ◽  
Mehdi Ahmadian ◽  
Wen Tao Liu
Keyword(s):  
Vibration Isolation ◽  
Mr Damper ◽  
Mr Dampers ◽  
Nonlinear Hysteresis ◽  
Output Force ◽  
Axis Parallel ◽  
Active Vibration ◽  
Parallel Platform ◽  
Long Stroke ◽  
Large Output

Within this work, a six-axis parallel vibration isolation platform with semi-active control ability is investigated. Traditional magnetorheological (MR) dampers could supply large output force and long stroke, but it also comes with a large self-weight. This problem is more serious when several MR dampers are needed in a parallel platform. Firstly, a double-piston MR damper have been developed, which will brings a small self-weight feature to the damper. Hyperbolic tangent model have been used to describe damper's nonlinear hysteresis. Using six of this double-piston MR damper, a parallel vibration isolation platform based on a cubic Stewart platform mechanism has been designed. Dynamical model of this platform has been built and simulated. Numerical simulation results in frequency domain indicate that the parallel semi-active vibration isolation platform has desirable vibration isolation properties in all six axes.

A Magnetorheological Vibration Isolator for Hydraulic Hybrid Vehicles

2005 ◽  
Author(s):  
The M. Nguyen ◽  
Mohammad H. Elahinia
Keyword(s):  
Vibration Isolation ◽  
Fuel Efficiency ◽  
Mr Damper ◽  
Hybrid Vehicles ◽  
Noise And Vibration ◽  
Variable Yield ◽  
Carrier Fluid ◽  
Mr Dampers ◽  
Hydraulic Hybrid ◽  
Motor Component

This paper presents the results of vibration isolation analysis for the pump/motor component of hydraulic hybrid vehicles (HHV). The hybrid subsystem can potentially improve the fuel efficiency of the vehicle by recovering some of the energy that is otherwise wasted in friction brakes. High pressure hydraulic fluid “assists” the engine in the initial acceleration period. Noise and vibration are an issue with these systems due to the variable hydraulic loads that are applied to the regenerative hybrid element. This study looks into the possibility of reducing the transmitted noise and vibration to the vehicle’s chassis by using smart magnetorheological (MR) dampers. MR dampers utilize MR fluid which is made of pure iron particles suspended in a carrier fluid. MR fluids deliver variable yield stress under the effect of a controllable electromagnetic field. To this end, an MR damper is modeled and simulated. In the simulation both shock and vibration loads are considered. The simulation results are compared with the performance of regular elastomer isolators. It is shown that the MR damper can effectively reduce the vibration for different working cycles of the regenerative system.

Numerical and Experimental Investigation of a Single-Axis Parallel Active Vibration Mount for Helicopter Seats Using Vibration Standards

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Amin Fereidooni ◽  
Silas Graham ◽  
Eric Chen ◽  
Viresh Wickramasinghe
Keyword(s):  
Vibration Isolation ◽  
Experimental Results ◽  
Least Mean Square ◽  
Axis Parallel ◽  
Active Vibration ◽  
Iso 2631 ◽  
The Given ◽  
Nonlinear Numerical Model ◽  
Good Agreement ◽  
Helicopter Vibration

Abstract This paper presents the experimental and numerical investigation of a single-axis replicate of a patented multi-axis active vibration isolation seat mount. Following the design of the multi-axis system, this single axis vibration isolation mount uses a flexible elastomer support placed in parallel with an electromagnetic actuator. This mount is designed to reduce the N/rev harmonic vibration of a helicopter using a filtered-X least mean square (FXLMS)-based controller. To improve the efficiency of the FXLMS controller for this application, the ISO-2631-1 Wk filter is added. Employing this modified controller, the experimental setup is tested using a payload mass representative of a 95th percentile pilot. The experimental results confirm the effectiveness of the proposed design in canceling the unwanted helicopter vibration, where the active mount effectively reduces the vibration representative of a Bell-412 helicopter by 69.37% (−10.28 dB, g-rms). In order to develop a better understanding of the problem, the system is also modeled from first principles in simulink. The comparison between the nonlinear numerical model and the experimental results demonstrates a good agreement between the two approaches. Moreover, it is shown that the addition of the ISO-2631-1 Wk filter improves the transient performance of the FXLMS controller for the given helicopter vibration profile.

Design and development of MR damper for two wheeler application and Kwok model parameters tuning for designed damper

2021 ◽  
pp. 095440702110363
Author(s):  
Pinjala Devikiran ◽  
NP Puneet ◽  
Abhinandan Hegale ◽  
Hemantha Kumar
Keyword(s):  
Degrees Of Freedom ◽  
Mr Damper ◽  
Constant Current ◽  
Model Parameters ◽  
Mr Dampers ◽  
Nonlinear Hysteresis ◽  
Custom Made ◽  
Improved Performance ◽  
Road Testing ◽  
Two Wheeler

Magnetorheological dampers have been the interest of many researchers for a few decades for the reason of being an effective and rapidly progressing technology in the field of semi-active controlled suspension. The dynamic behaviour of these devices with nonlinear hysteresis is quite a complicated phenomenon. Hence, this paper aims at the design, modelling and simulation of a custom-made MR damper for a two-wheeler vehicle. The Kwok model has been chosen to mathematically model the MR damper. The model parameters have been optimised by minimizing the error difference between experimental and model-generated force results. A PID control is designed to control the damper effectively depending on the deflection of the damper. The two-wheeler vehicle modelled with four degrees of freedom is coupled with a mathematical model of MR damper in front and rear suspension. Further, the dynamic analysis has been performed in MATLAB/Simulink considering random road input for different velocities and current input conditions. The improved performance of MR damper was observed in suppressing road irregularities using a PID controller. As an implementation part of the work, the developed damper has been implemented in a two wheeler vehicle for performance evaluation at on-road testing conditions. The results showed significant improvement in damper performance with increment of constant current controlling MR dampers.

scholarly journals Two-Dimensional CFD Modeling of Hysteresis Behavior of MR Dampers

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Pengfei Guo ◽  
Jing Xie
Keyword(s):  
Mr Damper ◽  
Cfd Modeling ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
One Dimensional ◽  
Hysteresis Behavior ◽  
Mr Dampers ◽  
Nonlinear Hysteresis ◽  
Mr Fluids ◽  
Dimensional Modeling

So far, most previous studies on the nonlinear hysteresis analysis of ER/MR dampers have been limited to one-dimensional modeling techniques. A two-dimensional (2D) axisymmetric CFD model of MR dampers is developed in this work. The main advantage of the proposed 2D model of MR dampers lies in that it can be used to predict dynamic behavior of MR devices of arbitrary geometries. The compressibility of MR fluids is the main factor responsible for the hysteresis behavior of MR dampers, and it has been rarely investigated in previous multidimensional modeling of MR damper. In our model, the compressibility of MR fluids is taken into account by the two-dimensional constitutive model which is extended from a previous one-dimensional physical model. The model is solved by using the finite element method, and the movement of the piston is described by the moving mesh technique. The MR damper in a reference is simulated, and the model predictions show good agreement with the experimental data in the reference.

scholarly journals A novel inverse dynamic model for a magnetorheological damper based on network inversion

2017 ◽  
Vol 24 (15) ◽  
pp. 3434-3453 ◽  
Author(s):  
MJL Boada ◽  
BL Boada ◽  
V Diaz
Keyword(s):  
Dynamic Model ◽  
Vibration Isolation ◽  
Mr Damper ◽  
Inverse Model ◽  
Magnetorheological Damper ◽  
Hysteretic Behavior ◽  
Inverse Dynamic ◽  
Inverse Dynamic Model ◽  
Mr Dampers ◽  
Highly Nonlinear

Semi-active suspensions based on magnetorheological (MR) dampers are receiving significant attention, especially for control of vibration isolation systems. The nonlinear hysteretic behavior of MR dampers can cause serious problems in controlled systems, such as instability and loss of robustness. Most of the developed controllers determine the desired damping forces which should be produced by the MR damper. Nevertheless, the MR damper behavior can only be controlled in terms of the applied current (or voltage). In addition to this, it is necessary to develop an adequate inverse dynamic model in order to calculate the command current (or voltage) for the MR damper to generate the desired forces as close as possible to the optimal ones. Due to MR dampers being highly nonlinear devices, the inverse dynamics model is difficult to obtain. In this paper, a novel inverse MR damper model based on a network inversion is presented to estimate the necessary current (or voltage) such that the desired force is exerted by the MR damper. The proposed inverse model is validated by carrying out experimental tests. In addition, a comparison of simulated tests with other damper controllers is also presented. Results show the effectiveness of the network inversion for inverse modeling of an MR damper. Thus, the proposed inverse model can act as a damper controller to generate the command current (or voltage) to track the desired damping force.

scholarly journals Experimental and Numerical Studies of Magnetorheological (MR) Damper

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. K. Mangal ◽  
Ashwani Kumar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mr Damper ◽  
Damping Force ◽  
Fem Model ◽  
Axisymmetric Model ◽  
Mr Dampers ◽  
Numerical Studies ◽  
Active Vibration ◽  
Force Characteristics

The design of a MR damper, consisting of piston and cylinder arrangement, is presented in this paper. In this paper, a 2D axisymmetric model based on finite element method (FEM) concept has been developed on the ANSYS platform to analyze and examine the MR damper characteristics. Based on the FEM model, a prototype of the MR damper is fabricated and tested experimentally in the semi active vibration laboratory of the department. The comparison of both these model analyses indicates that the FEM based model is effectively portraying the experimental behavior of the MR damper in terms of its damping force. The results obtained in this paper will be helpful for the designers to create more efficient and reliable MR dampers and also to predict its damping force characteristics.

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