抄録
Common autovehicle suspension employs a hydro-pneumatic absorber mounted in parallel with a compression spring that provides for the necessary restoring force. Since the spring omission becomes possible, a compact and lighter design can be achieved by using the recently proposed colloidal suspensions. In this experimental work, frontal and rear colloidal suspensions were designed to replace the traditional suspensions of a real autovehicle, and travel tests on a normal road with a semi-sinusoidal asphalt step were performed. From the impulse response of tested autovehicle one evaluates its comfortableness, both based on the K factor method and based on the equivalent acceleration recommended by the ISO 2631 standard. Such experimental method allows comfortableness evaluation without using an expensive test rig on which the autovehicle is placed over four hydraulic actuators and excited to simulate the real road conditions. Results obtained are firstly validated in the case of classical suspensions consisted of oil dampers mounted in parallel with compression helical springs. Then, colloidal dampers with and without attached compression springs were evaluated. Relationship between the travel speed of the autovehicle and the level of vibration perception, as well as the influence on the sickness, concentration and health was obtained for various values of the tire inflation pressure. Ride-comfort decreases at augmentation of the travel speed and the tire inflation pressure. Although the colloidal suspension was found to provide inferior comfortableness than the classical suspension, results obtained so far are encouraging, since better performances are to be expected by softening the colloidal suspension.
