Abstract： The design scheme of a new type suspension strut consisted of the air spring and the monotube hydraulic shock absorber was put forward, whose assembly stiffness characteristic was relative to the stroke. The structure and basic work principle of the strut was introduced. According to the simplified physical model for air springs with double gas rooms in parallel, a mathematical model for stiffness characteristics of the strut was established based on fluid mechanics and thermodynamics. Relationships between the stroke and gas room pressure, strut elastic force and strut stiffness were analyzed by using software SIMULINK. The simulation results indicate that the strut stiffness varies nonlinearly with the stroke. This property of strut stiffness helps to restrain wheel bouncing and “suspension breakdown” under bad road conditions. The strut specimen bench test of stiffness characteristic was carried out for verifying relationships between the gas pressure of main air chamber, strut elastic force and the stroke. The test results showed good agreement with the simulation results. It is verified that the established mathematical model of strut stiffness is correct and the design scheme of the strut is available, which could simplify the structure of active or semi-active suspension.
江浩斌 杜滢君 叶燊辰. 新型一体式悬架减振支柱的行程相关刚度特性研究[J]. , 2012, 31(22): 66-70.
Jiang Haobin Du Yingjun Hu Junxiu. Study on stroke dependent stiffness characteristicsof a new type integrated suspension strut. , 2012, 31(22): 66-70.
2012, Vol. 31 
