Optimization of Semi-active Seat Suspension with Magnetorheological Damper

2011 ◽  
pp. 393-398 ◽  
Author(s):  
Stefan Segla ◽  
J. Kajaste ◽  
P. Keski-Honkola
Keyword(s):  
Magnetorheological Damper ◽  
Seat Suspension

scholarly journals Integrated active and semi-active control for seat suspension of a heavy duty vehicle

2017 ◽  
Vol 29 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Donghong Ning ◽  
Shuaishuai Sun ◽  
Haiping Du ◽  
Weihua Li
Keyword(s):  
Resonance Frequency ◽  
Active Control ◽  
Integrated Control ◽  
Relative Displacement ◽  
Magnetorheological Damper ◽  
Active Force ◽  
Heavy Duty ◽  
Force Output ◽  
Seat Suspension ◽  
A Current

In this article, an integrated active and semi-active seat suspension for heavy duty vehicles is proposed, and its prototype is built; an integrated control algorithm applied measurable variables (suspension relative displacement and seat acceleration) is designed for the proposed seat prototype. In this seat prototype, an active actuator with low maximum force output (70 N), which is insufficient for an active seat suspension to control the resonance vibration, is applied together with a rotary magnetorheological damper. The magnetorheological damper can suppress the high vibration energy in resonance frequency, and then a small active force can further improve the seat suspension performance greatly. The suspension’s dynamic property is tested with a MTS system, and its model is identified based on the testing data. A modified on–off controller is applied for the rotary magnetorheological damper. A [Formula: see text] controller with the compensation of a disturbance observer is used for the active actuator. Considering the energy saving, the control strategy is designed as that only when the magnetorheological damper is in the off state (0 A current), the active actuator will have active force output, or the active actuator is off. Both simulation and experiment are implemented to verify the proposed seat suspension and controller. In the sinusoidal excitations experiment, the acceleration transmissibility of integrated control seat has lowest value in resonance frequency and frequencies above the resonance, when compared with power on (0.7 A current), power off (0 A current) and semi-active control seat. In the random vibration experiment, the root mean square acceleration of integrated control seat suspension has 47.7%, 33.1% and 26.5% reductions when compared with above-mentioned three kinds of seat suspension. The power spectral density comparison indicates that the integrated seat suspension will have good performance in practical application. The integrated active and semi-active seat suspension can fill energy consumption gap between active and semi-active control seat suspension.

A sky-hook sliding mode semiactive control for commercial truck seat suspension

2020 ◽  
pp. 107754632094097
Author(s):  
Qiang Chen ◽  
Yong Zhang ◽  
Chengwei Zhu ◽  
Jinbo Wu ◽  
Ye Zhuang
Keyword(s):  
Nonlinear System ◽  
Phase Portrait ◽  
Control Method ◽  
Reference Model ◽  
Sliding Mode ◽  
Tracking Error ◽  
Magnetorheological Damper ◽  
Nonlinear Controller ◽  
Parameter Uncertainties ◽  
Seat Suspension

A semiactive seat suspension control method is proposed in this study and applied to attenuate the vibration of the commercial truck seat for enhancing its ride comfort. The semiactive seat suspension system with a magnetorheological damper behaves with undesirable nonlinear properties. The proposed controller is a typical nonlinear controller, which takes the ideal sky-hook controller as the reference model and forces the tracking error vector. The controller has achieved great performance of attenuating vibration and is robust to parameter uncertainties and external disturbances. The relaxation oscillation phenomenon and convergence were also analyzed by the contribution of the phase portrait. As the phase portrait depicted, the sky-hook controller, a weakly nonlinear system, could be approximated by the equivalent linear approximate model. However, the proposed controller, the sky-hook sliding mode controller, is a strongly nonlinear system, which could not be linearized by the regular perturbation theory, and the criterion is given by the phase portrait. The experiment results showed good agreement with the simulation results, and some other matters encountered were also analyzed in the process of application.

No-Jerk Skyhook Control Methods for Semiactive Suspensions

2004 ◽  
Vol 126 (4) ◽  
pp. 580-584 ◽  
Author(s):  
Mehdi Ahmadian ◽  
Xubin Song ◽  
Steve C. Southward
Keyword(s):  
Relative Velocity ◽  
Magnetorheological Damper ◽  
Damping Force ◽  
Electrical Currents ◽  
Zero Crossings ◽  
Seat Suspension ◽  
Suspension Systems ◽  
Heavy Truck ◽  
The Relationship ◽  
Study Offer

This paper presents two alternative implementations of skyhook control, named “skyhook function” and “no-jerk skyhook,” for reducing the dynamic jerk that is often experienced with conventional skyhook control in semiactive suspension systems. An analysis of the relationship between the absolute velocity of the sprung mass and the relative velocity across the suspension are used to show the damping-force discontinuities that result from the conventional implementation of skyhook control. This analysis shows that at zero crossings of the relative velocity, conventional skyhook introduces a sharp increase (jump) in damping force, which, in turn, causes a jump in sprung-mass acceleration. This acceleration jump, or jerk, causes a significant reduction in isolation benefits that can be offered by skyhook suspensions. The alternative implementations of skyhook control included in this study offer modifications to the formulation of conventional skyhook control such that the damping force jumps are eliminated. The alternative policies are compared to the conventional skyhook control in the laboratory, using a base-excited semiactive system that includes a heavy-truck seat suspension. An evaluation of the damping force, seat acceleration, and the electrical currents supplied to a magnetorheological damper, which is used for this study, shows that the alternative implementations of skyhook control can entirely eliminate the damping-force discontinuities and the resulting dynamic jerks caused by conventional skyhook control.

scholarly journals A seat suspension with a rotary magnetorheological damper for heavy duty vehicles

2016 ◽  
Vol 25 (10) ◽  
pp. 105032 ◽  
Author(s):  
S S Sun ◽  
D H Ning ◽  
J Yang ◽  
H Du ◽  
S W Zhang ◽  
...  
Keyword(s):  
Magnetorheological Damper ◽  
Heavy Duty ◽  
Seat Suspension ◽  
Heavy Duty Vehicles

Modeling and Verification of an Innovative Active Pneumatic Vibration Isolation System

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
H. Porumamilla ◽  
A. G. Kelkar ◽  
J. M. Vogel
Keyword(s):  
Natural Frequency ◽  
Vibration Isolation ◽  
Computational Study ◽  
Hydraulic Cylinder ◽  
Magnetorheological Damper ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Seat Suspension ◽  
Active Vibration ◽  
Novel Concept

This paper presents a novel concept in active pneumatic vibration isolation. The novelty in the concept is in utilizing an air-spring-orifice-accumulator combination to vary the natural frequency as well as inject damping into the system per requirement, thereby eliminating the need for a hydraulic cylinder or a magnetorheological damper. This continuously variable natural frequency and damping (CVNFD) technology is aimed at achieving active vibration isolation. For analysis purposes, a particular application in the form of pneumatic seat suspension for off-road vehicles is chosen. A mathematical model representing the system is derived rigorously from inertial dynamics and first principles in thermodynamics. Empirical corelations are also used to include nonlinearities such as friction that cannot be accounted for in the thermodynamic equations. An exhaustive computational study is undertaken to help understand the physics of the system. The computational study clearly depicts the CVNFD capability of the vibration isolation system. An experimental test rig is built to experimentally validate analytical and simulation modeling of the system. Experimental verification corroborated the variable natural frequency and damping characteristic of the system observed through computational simulations.

Design, modeling, and control of a magnetorheological rotary damper for scissor seat suspension

2020 ◽  
Vol 234 (9) ◽  
pp. 2402-2416
Author(s):  
Jianqiang Yu ◽  
Xiaomin Dong ◽  
Xuhong Wang ◽  
Junli Li ◽  
Biao Li
Keyword(s):  
Experimental Tests ◽  
Nonlinear Damping ◽  
Magnetorheological Damper ◽  
Hysteretic Model ◽  
Active System ◽  
Backbone Curve ◽  
Modeling And Control ◽  
Seat Suspension ◽  
Damping Characteristics ◽  
And Control

This research investigates the design, modeling, and control of an improved magnetorheological rotary damper for seat suspension. A magnetorheological damper with optimized flux path is developed to improve the distribution of magnetic field. Its dynamic damping characteristics are tested by MTS machine under sinusoidal excitations. To describe the nonlinear damping characteristics of magnetorheological damper, a hysteretic model based on backbone curve is selected by comparing with other models. To verify the feasibility of seat suspension with the proposed magnetorheological damper, the simulated analysis and experimental tests are conducted. A dynamic model of scissor seat suspension with rotary damper is constructed and simplified. The performances of semi-active system show that the seat suspension with the proposed damper can reduce vibration efficiently.

H∞ control for a semi-active scissors linkage seat suspension with magnetorheological damper

2018 ◽  
Vol 30 (5) ◽  
pp. 708-721 ◽  
Author(s):  
Xiu-Mei Du ◽  
Miao Yu ◽  
Jie Fu ◽  
You-Xiang Peng ◽  
Hui-Feng Shi ◽  
...  
Keyword(s):  
State Feedback ◽  
Low Frequency ◽  
High Amplitude ◽  
Magnetorheological Damper ◽  
Seat Suspension ◽  
Damping Characteristics ◽  
The Neural Network ◽  
Inverse Models ◽  
Stiffness And Damping ◽  
Uncontrolled System

In this article, a robust state-feedback H∞ control for semi-active scissors linkage seat suspension with magnetorheological damper is investigated to reduce low-frequency and high-amplitude vibration, leading to health disorders in drivers or passengers. First, the stiffness and damping characteristics of the semi-active scissors linkage seat suspension are analyzed and a simplified model of the semi-active scissors linkage seat suspension is introduced. Then, the forward and inverse models of magnetorheological damper are described by the neural network method. Furthermore, the robust state-feedback H∞ control is established by considering the system uncertainties. The proposed approach is finally validated by experiment on a test rig under different sinusoidal excitations and load masses. Experimental results show that the human vibration is reduced up to 47.66% compared with the uncontrolled system.

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