A Suspension system can be defined as the mechanism that physically separates the car body from the car wheels. The purpose of any suspension system is to increase the ride comfort, road handling and stability of closed loop system. The suspension design must be compensate the effect of conflicting criteria of road holding, load carrying and passenger comfort. An active suspension system has been proposed. A quarter-car two degree-of-freedom (2DOF) system is designed and constructed to simulate the actions of an active quarter car suspension system. White noise input is introduced to a given system to expressed unpaved road and both step input and sine wave input are studied as well. The control strategy is based on two degree of freedom PID controller. (MATLAB/ Simulink) is used to verify the proposed algorithm. The comparison between the passive and active suspension and the results obtained from a range of road input simulations in the proposed algorithm shows the effectiveness of the proposed algorithm and best results are obtained.
This research is devoted to investigate the effect of shot penning time by steel ball with diameter 1.5 mm on the wear resistance of (Al-3.5%Cu) alloy. A pin –on- disc technique has been used to evaluate wear rate of the specimens as prepared and the specimens which treated by shot peening at various time (10,15, 25, 35) min ,were slide under dry sliding conditions on the carbon steel disc at various applied loads (9.81, 19.62, 29.43, 39.24 and 45)N and slide periods(30, 60,90 , 120 and 150)min under variable sliding speeds(0.94, 1.88, 2.82, 3.76 and 4.9) m/s.The result show that the wear for all the shot peen times have improved the wear resistance and best resistance has been achieved at time 25 min.
In the automotive industry, the riding comfort and handling qualities of an automobile are greatly affected by the suspension system. This paper presents the robust design of vehicle suspension arm using stochastic design improvement (SDI) technique based on Monte Carlo simulation. The main goal of this study is to determine the optimum design for the suspension arm. The structural model of the suspension arm was utilizing the Solid works and aluminum alloys (AA7075-T6) are selected as a suspension arm materials. The linear static stress distribution is investigated using the commercial Finite element analysis package, and dynamic analysis was performed using NASTRAN software. SDI has been performed to the design. A target output behavior is selected from the output variables available in the analysis. The result shows that the lower arm design has a higher capability to stand higher pressure as 9.18 MPa with the stress acted on lower arm is 41 MPa. The new parameter of material can be chose as optimum result for the lower suspension arm.
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