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

摘要： 七桥登高平台消防车油气悬架系统被侧倾和俯仰的中心面划分为4个部分，对每部分内悬架油缸并连后设计了4种耦连方案：四部分相互独立、对侧有杆腔连通、对侧交连和对角交连。建立各耦连油气悬架的数学模型和AMESim仿真模型，分析各耦连悬架的垂向、侧倾、俯仰及扭转的刚度特性和示功特性。对安装4种耦连油气悬架的车辆应用多轴耦合道路模拟试验台，试验研究了匀速、制动和转向工况下车身的垂向、侧倾和俯仰响应。试验结果与理论结果基本一致，对比分析表明：油气悬架耦连方案对车辆垂向振动影响较小、对车辆姿态稳定性影响很大，对侧交连的方案最适合质心位置高、侧翻阈值低的七桥登高平台消防车。

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