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ACTIVE CONTROL OF QUARTER-CAR SUSPENSION SYSTEM USING LINEAR QUADRATIC REGULATOR  [PDF]
M.P. Nagarkar,G.J Vikhe,K.R. Borole,V.M. Nandedkar
International Journal of Automotive and Mechanical Engineering , 2011,
Abstract: The automobile is composed of many systems. One of these is the suspension system. The main functions of the automotive suspension system are to provide vehicle support, stability and directional control during handling manoeuvres and to provide effective isolation from road disturbances. The suspension system has to balance the tradeoff between ride comfort and handling performance. This paper analyses the passive suspension system and active suspension system using a Linear Quadratic Regulator (LQR) controller. A linear quarter-car model is used for the analysis and simulation. The performance of the LQR controller is compared with the passive suspension system. The simulation results show that the LQR controller improves vehicle ride comfort.
THE INFLUENCE OF BRAKE PADS THERMAL CONDUCTIVITY ON PASSANGER CAR BRAKE SYSTEM EFFICIENCY
Predrag D Milenkovi?,Sa?a J Jovanovi?,Aleksandra S Jankovi?,Milan D Milovanovi?
Thermal Science , 2010, DOI: tsci100505016m
Abstract: In phase of vehicle braking system designing, besides of mechanical characteristics, it is also necessary to take under consideration the system's thermal features. This is because it is not enough just to achieve proper braking power, for the brake system to be effective but equally important thing is the dissipation of heat to the environment. Heat developed in the friction surfaces dissipate into the environment over the disk in one hand and through the brake linings and caliper, in the other. The striving is to make that greatest amount of heat to dissipate not threw the brake pads but threw disc. The experimental researching of heat transfer process taking place at vehicle brakes was made in the R&D Center of "Zastava automobili" car factory in order to increase the efficiency of brake system. The standard laboratory and road test procedures were used, according to factory quality regulations. The modern equipment such as thermo camera, thermo couples, torque transducers, signal amplifiers, optical speed measuring system and laptop computer were used. In this paper will be shown the part of the experimental researching, which refers to the thermal conductivity of brake pad friction linings.
Procedure of linear decimation in car suspension diagnosis
Pawe? SOBCZAK
Transport Problems : an International Scientific Journal , 2009,
Abstract: In admission this paper presents most popular car suspensions. The main part of article show capabilities of uses of linear decimation in car suspension diagnosis.
ESTIMATION OF DRIVER’S POWER EXPENSES OF CAR BRAKE MANAGEMENT
A. Turenko,S. Shuklinov
Аvtomob?lnyi Transport , 2010,
Abstract: The estimation method of driver’s power expenses for the brake management is offered. The estimation method takes into account power expenses at driving in action of the brake system and power expenses at holding the pressed brake pedal
INVESTIGATION OF ANTILOCK BRAKE SYSTEM EFFECT ON PASSENGER CAR BRAFKING EFFICIENCY  [PDF]
V. Klimenko,A. Sarayev,I. Davidenko
Аvtomob?lnyi Transport , 2011,
Abstract: It has been experimentally proved that in case of emergency braking the constant decelera-tion of passenger cars equipped by antilock brake system exceeds the tabulated statistical data by 7,7–17 % that is recommended to apply at technical expertise at traffic accident causes investigation.
Optimal design of passenger car suspension for ride and road holding
Shirahatti, Anil;Prasad, P.S.S.;Panzade, Pravin;Kulkarni, M.M.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2008, DOI: 10.1590/S1678-58782008000100010
Abstract: the primary function of a vehicle suspension system is to isolate the road excitations experienced by the tyres from being transmitted to the passengers. in this paper, a suitable optimizing technique is applied at design stage to obtain the suspension parameters of a passive suspension and active suspension for a passenger car which satisfies the performance as per iso 2631 standards. a number of objectives such as maximum bouncing acceleration of seat and sprung mass, root mean square (rms) weighted acceleration of seat and sprung mass as per iso2631 standards, jerk, suspension travel, road holding and tyre deflection are minimized subjected to a number of constraints. the constraints arise from the practical kinetic and comfortability considerations, such as limits of the maximum vertical acceleration of the passenger seat, tyre displacement and the suspension working space. the genetic algorithm (ga) is used to solve the problem and results were compared to those obtained by simulated annealing (sa) technique and found to yields similar performance measures. both the passive and active suspension systems are compared in time domain analyses subjected to sinusoidal road input. results show passenger bounce, passenger acceleration, and tyre displacement are reduced by 74.2%, 88.72% and 28.5% respectively, indicating active suspension system has better potential to improve both comfort and road holding.
Parameter identification of a full-car model for active suspension design  [PDF]
D. Guidaa,F. Nilvetti,C.M. Pappalardo
Journal of Achievements in Materials and Manufacturing Engineering , 2010,
Abstract: Purpose: A method for identifying parameters of a full-car model for active suspension designDesign/methodology/approach: The method is based on ERA/OKID identification procedure developed by Juang [1].Findings: Numerical results show a good agreement with real system parameters.Research limitations/implications: Results show that this method works well only with a high signal-to-noise ratio.Practical implications: This method can be used as an aid to active suspension design.Originality/value: This procedure has been tested on the full-car model of suspension system in two cases: a) full-state measurements; b) not full-state measurements.
Application of Magneto-Rheological Damper for Car Suspension Control  [PDF]
M.M. Rashid,M.A. Hussain,N. Abd. Rahim
Journal of Applied Sciences , 2006,
Abstract: The MR damper is a control device that consists of a hydraulic cylinder filled with magnetically polarizable particles suspended in a liquid. MR dampers dissipate vibration by absorbing energy. Magnetorheological (MR) fluids dampers are very effective to control vibration, which use MR fluids to produce controllable damping force and provide both the reliability of passive systems and the facility of active control systems with small power supply. Due to their mechanical simplicity, high dynamic range, low power requirements, large force capacity and robustness, offer an attractive means of vibration protection. The objective of this study are understanding the characteristics of the MR damper to provide effective damping for the purpose of suspension isolation or suppression car body. In this study, fuzzy logic controller is used to control semiactive car suspension system.
Using fuzzy logic to control active suspension system of one-half-car model  [PDF]
St?íbrsky Antonín,Hyniová Kate?ina,Honcù Jaroslav,Kruczek Ale?
Acta Montanistica Slovaca , 2003,
Abstract: In the paper, fuzzy logic is used to control active suspension of a one-half-car model. Velocity and acceleration of the front and rear wheels and undercarriage velocity above the mentioned wheels are taken as input data of the fuzzy logic controller. Active forces improving vehicle driving, ride comfort and handling properties are considered to be the controller outputs. The controller design is proposed to minimize chassis and wheels deflection when uneven road surfaces, pavement points, etc. are acting on the tires of running cars. In the conclusion, a comparison of active suspension fuzzy control and spring/damper passive suspension is shown using MATLAB simulations.
Simulation and Analysis of Passive and Active Suspension System Using Quarter Car Model for Different Road Profile
Abdolvahab Agharkakli#1 , Ghobad Shafiei Sabet*2 , Armin Barouz#3
International Journal of Engineering Trends and Technology , 2012,
Abstract: The objectives of this study are to obtain a mathematical model for the passive and active suspensions systems for quarter car model. Current automobile suspension systems using passive components only by utilizing spring and damping coefficient with fixed rates. Vehicle suspensions systems typically rated by its ability to provide good road handling and improve passenger comfort. Passive suspensions only offer compromise between these two conflicting criteria. Active suspension poses the ability to reduce the traditional design as a compromise between handling and comfort by directly controlling the suspensions force actuators. In this study, the Linear Quadratic Control (LQR) technique implemented to the active suspensions system for a quarter car model. Comparison between passive and active suspensions system are performed by using different types of road profiles. The performance of the controller is compared with the LQR controller and the passive suspension system.
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