DESAIN DAN ANALISA PERFORMA HYDRAULIC PNEUMATIC SUSPENSION SYSTEM PADA KENDARAAN PERTANIAN BERBASIS TRACKED CHAIN WHEELS

Indonesia is agrarian country whose people make their living as farmers, but until now still has hard to handle problem using agricultural’s technology, because the development of agricultural’s technology in Indonesia still inadequate,
such as crop distribution, because some regions have texture of the ground surface is uneven, with use hydraulicpneumatic suspension and mattrack designed using SOLIDWORK is expected to be able to overcome the distribution of crop yields by
adjusting Daihatsu Grandmax PU 1.3 STD. The main of this research is to see response of harmonic oscillatory sinusoidal with amplitude 0.02 m and frequency
of 0.5 Hz, response of the damping force and spring force of a hydraulicpneumatic suspension using ideal PID controller. Simulation using MATLAB and Simulink to see continuous results with a time of 20 seconds. The test was carried out on the rear wheels with quarter vehicle systeml, by replacing the conventional suspension with a hydraulicpneumatic which has an orifice diameter of 2 mm and a piston of 78 mm using ASTM D 1298 oil of = 876 / 3, for the gas accumulator it has the initial pressure and volume in both cylinders ( 30, 40) is 9 × 105 , ( 30, 40) of
6,3617310−4 3 with a floating piston diameter of 78 mm, resultinga damping force is 4,011 N and spring force is 672 Pa and produces harmonic oscillatory vehicle of
0.0146 m, and have a steady state at 6.2 seconds. And maximum oscillating by mattrack 0.02032 m, indicating that the mattrack mass is 172.365 kg and has good road grip.

Keywords: Damping force, mattracks, suspension hydraulicpneumatic, PID controller, spring force.