Modelling of magnetorheological semi-active suspension system controlled by semi-active damping force estimator

A semi-active suspension variable damping control strategy for heavy vehicles is proposed in this work. First, a nine-degree-of-freedom model of a semi-active suspension of heavy vehicles and a stochastic road input mathematical model are established. Second, using a 1/6 vehicle as an example, a semi-active suspension system with damping that can be adjusted actively is designed using proportional relief and throttle valves. The damping dynamic characteristics of the semi-active suspension system and the time to establish the damping force are studied through a simulation. Finally, a variable damping control strategy based on an actuator motion state is proposed to adjust the damping force of the semi-active suspension system actively and therefore satisfy the vibration reduction requirements of different roads. Results show that the variable damping control suspension can substantially improve vehicle ride comfort and handling stability in comparison with a passive suspension.

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Explicit model predictive control of semi-active suspension systems with magneto-rheological dampers subject to input constraints

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x20914404 ◽

2020 ◽

Vol 31 (9) ◽

pp. 1157-1170 ◽

Cited By ~ 1

Author(s):

Van Ngoc Mai ◽

Dal-Seong Yoon ◽

Seung-Bok Choi ◽

Gi-Woo Kim

Keyword(s):

Model Predictive Control ◽

Vibration Control ◽

Predictive Control ◽

Active Suspension ◽

Suspension System ◽

Computational Time ◽

Control Input ◽

Control Performance ◽

Damping Force ◽

Magneto Rheological

This article presents vibration control of a semi-active quarter-car suspension system equipped with a magneto-rheological damper that provides the physical constraint of a damping force. In this study, model predictive control was designed to handle the constraints of control input (i.e. the limited damping force). The explicit solution of model predictive control was computed using multi-parametric programming to reduce the computational time for real-time implementation and then adopted in the semi-active suspension system. The control performance of model predictive control was compared with that of a clipped linear-quadratic optimal controller, where the damping force was bound using a standard saturation function. Two types of road conditions (bump and random excitation) were applied to the suspension system, and the vibration control performance was evaluated through both simulations and experiments.

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Multimode Coordination Control of a Hybrid Active Suspension

Shock and Vibration ◽

10.1155/2018/6378023 ◽

2018 ◽

Vol 2018 ◽

pp. 1-16 ◽

Cited By ~ 1

Author(s):

Fa-Rong Kou ◽

Dong-Dong Wei ◽

Lei Tian

Keyword(s):

Mr Damper ◽

Active Suspension ◽

Suspension System ◽

Ball Screw ◽

Damping Force ◽

Active Mode ◽

Damping Control ◽

Electromagnetic Damping ◽

Regenerative Energy ◽

Suspension Structure

In order to effectively realize the damping control and regenerative energy recovery of vehicle suspension, a new kind of hybrid active suspension structure with the ball screw actuator and magnetorheological (MR) damper is put forward. Firstly, for the analysis of the suspension performance, a quarter dynamic model of vehicle hybrid suspension is established, and at the same time, the mathematical models of MR damper and ball screw actuator are founded. Secondly, the active mode with damping switching control of the hybrid suspension and the semiactive mode with feedback adjustment of the electromagnetic damping force of the hybrid suspension are analyzed. Then, the multimode coordinated control system of the hybrid suspension is designed. Under the cyclic driving condition, the damping performance and energy consumption characteristics of the hybrid suspension are simulated by MATLAB/Simulink software. Finally, the bench tests of the hybrid suspension system are done. The simulation and experimental results show that compared with passive suspension, the root mean square of the sprung mass acceleration of the hybrid suspension with the active mode and semiactive mode is, respectively, reduced by 39% and 16% under the random road. The damping effect of the hybrid suspension system is obvious.

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Experimental Researches on the Dynamic Behavior of the Magnetorheological Damper

10.20944/preprints202005.0237.v1 ◽

2020 ◽

Author(s):

Alexandru Dobre

Keyword(s):

Dynamic Behavior ◽

Shock Absorber ◽

Active Suspension ◽

Suspension System ◽

Magnetorheological Damper ◽

Passenger Cars ◽

Damping Force ◽

The Road ◽

Shock Absorbers ◽

Road Profile

In the context of improving the comfort and dynamics of the vehicle, the suspension system has been continuously developed and improved, especially using magnetorheological (MR) shock absorbers. The development of this technology which is relatively new has not been easy. Thus, the first widespread commercial use of MR fluid in a semi-active suspension system was implemented in passenger cars. The magnetorheological shock absorber can combine the comfort with the dynamic driving, because it allows the damping characteristic to be adapted to the road profile. The main objective of the paper is to analyze the dynamic behavior of the magnetorheological shock absorber in the semi-active suspension. In this sense, the author carried out a set of experimental measurements with a damping test bench, specially built and equipped with modern equipment. The results obtained from the experimental determinations show a significantly improved comfort when using a magnetorheological shock absorber, compared to a classic one, by the fact that the magnetorheological shock absorber allows to modify the damping coefficient according to the road conditions, thus maintaining the permanent contact between the tire and the road due to increased damping force.

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“Design and Perfomance Analysis of MR Twin Tube Shock Absorber Damper of Semi-Active Suspension System”

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b6806.019320 ◽

2020 ◽

Vol 9 (3) ◽

pp. 3015-3021

Keyword(s):

Shock Absorber ◽

Cost Effective ◽

Active Suspension ◽

Comparison Method ◽

Suspension System ◽

Damping Force ◽

Fluid Mixture ◽

Force Increase ◽

Two Wheeler ◽

Effective Design

A shock absorber suspension system of vehicle and bicycle in automobile during travelling on a road surface leads jerky, bound and rebound motion a bicycle or vehicle due to this problem by shock and vibration creates discomfort and unsafely to driver and passenger. The vibration coming from vehicle leads to pain, discomfort and dissipated heat and energy which impact on reduction in efficiency shock absorber on semi active suspension system. Comparison method of actual and design Shock absorber by reductions spring stiffness, use falling tube viscometer method for finding efficient fluid mixture for reducing shock and vibration amplitude of theoretical and experimental method. In this research more shock absorbent and energy efficient Shock Absorber Damper is developed for Splendor two wheeler to controlled the vibration of semi active suspension system of vehicle. The fluid greatly increases its viscosity and result in large damping force, less power consummation, fast and smooth response, and cost effective design and environmentally friendly. The damping force increase and decrease in leads to bounce and renounces.

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Application of explicit model predictive control to a vehicle semi-active suspension system

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/1461348418822170 ◽

2019 ◽

Vol 39 (3) ◽

pp. 772-786 ◽

Cited By ~ 1

Author(s):

Zhang Houzhong ◽

Liang Jiasheng ◽

Yuan Chaochun ◽

Sun Xiaoqiang ◽

Cai Yingfeng

Keyword(s):

Model Predictive Control ◽

Objective Function ◽

Predictive Control ◽

Control Method ◽

Active Suspension ◽

Suspension System ◽

Explicit Model ◽

Damping Force ◽

Explicit Model Predictive Control ◽

Actuator Constraints

The vehicle semi-active suspension is a typical multiple-input multiple-output system with strong couplings, actuator constraints and fast dynamics. This paper addresses the damping force regulation of shock-absorber in vehicle semi-active suspensions using an explicit model predictive control (EMPC) approach, which allows minimizing the system control objective function while satisfying the actuator constraints. The main advantage of the proposed approach is that the control law computation requirement is low, and thus the EMPC system is suitable for implementation in a standard automotive microcontroller. The design of the EMPC system consists of mathematical modeling, objective function determination, controller formulation and simulation validation. Presented simulation results verify that a superior control performance of the vehicle semi-active suspension system is achieved by the proposed EMPC control approach compared with the performance obtained using conventional control method.

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Modeling an Active Vehicle Suspension System With Application of Digital Displacement Pump Motor

Volume 5: 13th Design for Manufacturability and the Lifecycle Conference; 5th Symposium on International Design and Design Education; 10th International Conference on Advanced Vehicle and Tire Technologies ◽

10.1115/detc2008-49035 ◽

2008 ◽

Cited By ~ 4

Author(s):

Xubin Song

Keyword(s):

Control Strategy ◽

Shock Absorber ◽

Active Suspension ◽

Suspension System ◽

Vehicle Suspension ◽

Damping Force ◽

Independent Components ◽

Displacement Pump ◽

Vehicle Suspension System ◽

Active Vehicle Suspension System

Vehicle suspension design can be simplified by using compressible fluid (CF) based struts. One single CF strut can provide both spring and damping force instead of two independent components of spring and shock absorber in a traditional vehicle suspension system. With the application of a digital displacement pump motor (DDPM) to modulate the fluid amount in CF struts, a hydraulic based active suspension can be developed. Each vehicle suspension corner (i.e., CF strut) can be linked to (at least) one cylinder of a multiple cylinder DDPM. Each cylinder has two poppet valves to allow exchanging flow between strut and accumulator. Those valves are actively controlled according to a properly designed control strategy. Thus DDPM can regulate the fluid flow to/from the CF struts to create a desired strut force at each suspension corner. This paper focuses on elaborating this novel active suspension using CFS and DDPM, and then presents a model that can well capture the macro-behavior of this new active suspension.

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Parametric Analysis of Magnetorheological Strut for Semiactive Suspension System Using Taguchi Method

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.2139 ◽

2018 ◽

Vol 8 (4) ◽

pp. 3218-3222

Author(s):

R. N. Yerrawar ◽

R. R. Arakerimath

Keyword(s):

Ride Comfort ◽

Process Development ◽

Mr Damper ◽

Active Suspension ◽

Performance Measure ◽

Suspension System ◽

Magnetorheological Damper ◽

Tire Pressure ◽

Damping Force ◽

Minimum Number

Magnetorheological (MR) strut is among the leading advanced applications of semi-active suspension systems. The damping force of MR damper is controlled by varying the viscosity of MR fluid. In this work, the viscosity of MR damper varies by changing the current from 0.5A to 0.7A. The design of experiments is taken into account in concert with the product/process development as one completely advanced tool. The parameters used for ride comfort optimization are sprung mass, spring stiffness, tire pressure, current, and cylinder material with two levels of each. Taguchi orthogonal array method is used to select the best results by parameter optimization with a minimum number of test runs. In this paper, from Taguchi L16 array and S/N ratio analysis, it is observed that the cylinder material with Al and CS for damper cylinder is a key parameter for performance measure of semi-active suspension system. From regression analysis, a linear mathematical model is developed for Al and CS as cylinder materials. The interaction of cylinder materials with all four parameters is plotted. The methodology implemented for measurement of acceleration as a ride comfort is as per IS 2631-1997. The more economical model of magnetorheological damper will motivate Indian auto industry to broader applications.

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