关键词: 七桥登高平台消防车, 油气悬架, 耦连方案, 刚度特性, 车身姿态

Abstract: The HPS system of seven axle platform fire truck was divided into four parts by the center plane of rolling and pitching. After parallel connection of inner suspension cylinders for each part, the four coupling schemes were designed as follows:four part independent, contralateral rod cavity connection, contralateral cross connection and diagonal cross connection. The mathematical model and AMESim simulation model for each HPS were established. The dynamometer characteristics and stiffness characteristics of vertical, rolling, pitching and torsional were analyzed. The body vibration responses of vehicles with these four kinds of coupled HPS were studied under driving, braking and steering conditions on a multi-axle coupled road simulation test rig. The test results are almost the same with theoretical results. Comparison analyses show that the HPS coupling scheme has less effect on vehicle vertical vibration but greater effect on vehicle attitude stability. The scheme of contralateral cross connection is most suitable for seven axle high platform fire trucks with high centroid position and low rollover threshold.

Key words: seven axle high platform fire truck, hydro-pneumatic suspension(HPS), coupling scheme, stiffness characteristic, vehicle body attitude