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

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.

scholarly journals Experimental Researches on the Dynamic Behavior of the Magnetorheological Damper

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.

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

2008 ◽  
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.

Design and analysis of an integrated sliding mode control–two-point wheelbase preview strategy for a semi-active air suspension with stepper motor-driven gas-filled adjustable shock absorber

2018 ◽  
Vol 232 (9) ◽  
pp. 1194-1211 ◽  
Author(s):  
Jing Zhao ◽  
Pak Kin Wong ◽  
Xinbo Ma ◽  
Zhengchao Xie
Keyword(s):  
Sliding Mode Control ◽  
Shock Absorber ◽  
Sliding Mode ◽  
Single Point ◽  
Rear Wheel ◽  
Suspension System ◽  
Stepper Motor ◽  
Damping Force ◽  
Mode Control ◽  
Air Suspension

This article proposes an integrated sliding mode control–two-point wheelbase preview strategy for semi-active air suspension system with gas-filled adjustable shock absorber. First of all, a vehicle suspension model with rolling lobe air spring and gas-filled adjustable shock absorber is built, following with a road input model for the front wheel. By describing the detailed structure and working process of the gas-filled adjustable shock absorber, the regulating mechanism between the stepper motor and the designed gas-filled adjustable shock absorber is established. Subsequently, the sliding mode control algorithm is applied to generate the desired damping force with the real-time state of the vehicle. Moreover, to predetermine the road profile for the rear wheel, a two-point wheelbase preview approach is proposed and its superiority is also illustrated as compared with the conventional single-point wheelbase preview approach. To evaluate the performance of the proposed system, numerical analysis is conducted with other three comparative schemes, namely, passive suspension system, active suspension system with H infinity control, and sliding mode control–controlled semi-active air suspension system with adjustable shock absorber. Simulation results show that the integrated sliding mode control–two-point wheelbase preview strategy can be successfully utilized in the semi-active air suspension system with stepper motor-driven gas-filled adjustable shock absorber, and the vehicle performance with the proposed system can be greatly improved.

scholarly journals Variable damping control strategy of a semi-active suspension based on the actuator motion state

2019 ◽  
Vol 39 (3) ◽  
pp. 787-802 ◽  
Author(s):  
Mingde Gong ◽  
Hao Chen
Keyword(s):  
Control Strategy ◽  
Ride Comfort ◽  
Active Suspension ◽  
Suspension System ◽  
Heavy Vehicles ◽  
Damping Force ◽  
Damping Control ◽  
Motion State ◽  
Variable Damping ◽  
Work First

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.

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

2020 ◽  
Vol 31 (9) ◽  
pp. 1157-1170 ◽  
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.

scholarly journals Multimode Coordination Control of a Hybrid Active Suspension

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
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.

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

2011 ◽  
Vol 42 (1) ◽  
pp. 49 ◽  
Author(s):  
Saiful Anuar Abu Bakar ◽  
Hishamuddin Jamaluddin ◽  
Roslan Abd. Rahman ◽  
Pakharuddin Mohd. Samin ◽  
Ryosuke Masuda ◽  
...  
Keyword(s):  
Active Suspension ◽  
Active Damping ◽  
Suspension System ◽  
Damping Force

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

2019 ◽  
Vol 39 (3) ◽  
pp. 772-786 ◽  
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.

A variable structure controller for a cost-effective electrostatic suspension system

2019 ◽  
Vol 41 (12) ◽  
pp. 3438-3451 ◽  
Author(s):  
Truyen Le
Keyword(s):  
Silicon Wafer ◽  
Sliding Mode ◽  
Local Existence ◽  
Variable Structure ◽  
Cost Effective ◽  
Suspension System ◽  
Experimental Results ◽  
Atmospheric Environment ◽  
Vibrational Amplitude ◽  
Damping Force

In this paper, the variable structure controller, which is designed considering the damping force and the nonlinear dynamic characteristic of an electrostatic suspension system, is used to suspend a 4-inch silicon wafer by electrostatic forces. The controller consists of a sliding mode controller that is used in the local existence region of a sliding mode and a relay feedback controller playing the role of a swing up controller. In order to highlight the performance of the proposed controller, the simulation and experimental results are shown. The performance of the controller is compared with that of the delay controller proposed in previous research. Experimental results show that a 4-inch silicon wafer has been stably suspended at a gap length of 300 µm in an atmospheric environment with very small steady-state vibrational amplitude. Simulation and experimental results shown that the variable structure controller is more effective than the delay controller for suppressing gap fluctuation when large damping forces are exerted on a suspended object.

scholarly journals Design and Implementation of a High-Voltage Generator with Output Voltage Control for Vehicle ER Shock-Absorber Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Chih-Lung Shen ◽  
Tsair-Chun Liang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Shock Absorber ◽  
Suspension System ◽  
Buck Converter ◽  
System Structure ◽  
Damping Force ◽  
Voltage Generator ◽  
High Voltage Generator ◽  
Er Fluid

A self-oscillating high-voltage generator is proposed to supply voltage for a suspension system in order to control the damping force of an electrorheological (ER) fluid shock absorber. By controlling the output voltage level of the generator, the damping force in the ER fluid shock absorber can be adjusted immediately. The shock absorber is part of the suspension system. The high-voltage generator drives a power transistor based on self-excited oscillation, which converts dc to ac. A high-frequency transformer with high turns ratio is used to increase the voltage. In addition, the system uses the car battery as dc power supply. By regulating the duty cycle of the main switch in the buck converter, the output voltage of the buck converter can be linearly adjusted so as to obtain a specific high voltage for ER. The driving system is self-excited; that is, no additional external driving circuit is required. Thus, it reduces cost and simplifies system structure. A prototype version of the actual product is studied to measure and evaluate the key waveforms. The feasibility of the proposed system is verified based on experimental results.

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