Abstract
Hydraulic shock absorber suspension system as the main vehicle of the damping components, its performance is directly related to the quality of vehicle safety and comfort. Shock absorber to improve the performance to ensure that quality in addition to advanced design, production technology modern management means but also test and advanced test equipment to detect characteristics of the shock absorber with the design requirements. In order to improve the detection performance test-bed should be used in other, more advanced technical design test excitation. This paper presents the use of hydraulic vibration, hydraulic vibration exciter by hydraulic cylinders hydraulic control valve and flexible components, such as composition.Hydraulic servo system used to collect the pressure sensors and displacement sensor signal to ensure the stability of vibration frequency and adjustable so that its principle is the main computer as a machine monitoring and control through data acquisition card monitoring and control of the test system. Test-bed action directive issued by the machine monitoring and control, through the D / A interface into the servo controller PID signal amplification and conditioning and then the signal output current to drive the electro-hydraulic servo valve. Hydraulic cylinder in the shock absorber movement-led campaign at the same time and were measured through the displacement sensor displacement, force sensorsAmount of damping force. Displacement detection signal and power signal conditioning, respectively, through appropriate data acquisition card to enter the two-way A / D, and then computer data processing to be requested through the shock absorber characteristic curve. Vibrator dual hydraulic cylinders for the differential hydraulic cylinder rod and piston rod end of the elastic element in the link, the other end of the vibration components as output. Test-bed in order to provide sinusoidal and random vibration and the design of hydraulic cylinder for the trip around the 120mm with oil pressure of 25MPa and the maximum velocity of the piston rod of up to 0.8m / s and maximum excitation frequency of 20HZ. At the same time, liquid cylinder pressure to bear a larger impact load, the structure of choice Cylinder flange connection and the use of welding.