Modeling and analysis the effect of orifice area variation to the dynamic response of hydro electro mechanic shock absorber (HEMS A)-double cylinder

摘要

Based on research, only 10% to 16% of the fuel energy used in order to move a car. It is caused by wasted residual energy engine, distributed in a form of heat energy on friction of the transmission system, braking and vibration of suspension system. One of the ways to increase energy efficiency of a car is to use the movement of suspension of the car using Hydraulic RSA (Regenerative Shock Absorber). In this final assignment will be discussed about modelling and analysis the effect of orifice area variation to the dynamic response of Hydraulic Regenerative Shock Absorber-Double Cylinder in quarter car. Inside the hydraulic system, there are 4 points of orifice. The analysis conducted with varying the diameter of orifice on point 1, the sizes are 2, 4, 6 mm and on point 2, 3 and 4 which the size was equalized 6 mm. After that, it was taken the highest value of the damper from one of the variation of orifice and tested in quarter car with varying the input as velocity of 20 km/hour, 40 km/hour and 60 km/hour for sinusoidal input and gamma = 1 for bump input. Then comparing the dynamic response of Quarter Car of HEMSA with Conventional Quarter Car with C = 20000 N. From the simulation result, it was obtained that there is an effect of orifice area variation, which is on variation 1 with 2 mm for orifice diameter. The HEMSA system generates damping force for 5,753 N and with the existence of orifice area variation doesn't affect the amount of electricity response from generator which is when compression can generate current of 3.607 A, voltage of 17.58 V and power of 63.44 W. The maximum value of transmissibility on HEMSA Quarter Car is 1.28 with velocity of 40 km/hour and on Conventional Quarter Car is 1.92 with velocity of 50 km/hour. And when velocity greater or equal to 60 km/hour, HEMSA Quarter Car can generate maximum power for 100 km/hour. If compared to Conventional Quarter Car, the HEMSA Quarter Car will be more efficient when it is used on velocity greater or equal to 80 km/hour, because the difference of transmissibility that was generated from Conventional Quarter Car with HEMSA Quarter Car on that velocity is 0.14 and in that velocity the HEMSA Quarter Car has generated maximum power.