摘要
提出了一种由空气弹簧与单筒式液压减振器组成的新型悬架减振支柱的设计方案，该减振支柱的总成刚度与工作行程相关。介绍了该减振支柱的结构组成和工作原理，基于并联双气室空气弹簧简化物理模型，应用流体力学及热力学理论，建立了减振支柱的刚度特性数学模型，运用SIMULINK软件对气室压力、总成弹性力及总成刚度与行程的关系进行仿真，仿真结果表明，总成刚度随行程的变化而非线性变化，有利于于抑制不良路面条件下的车轮跳动和“悬架击穿”。通过台架试验测试了减振支柱样件的主气室压力及总成弹性力与行程的关系，试验结果与仿真结果基本一致，表明所建的减振支柱刚度特性数学模型正确有效，所设计的新型减振器支柱结构方案可行，可简化主动或半主动悬架结构。
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.
关键词
悬架 /
减振支柱 /
行程相关刚度特性 /
数学模型 /
台架试验
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Key words
suspension /
strut /
stroke dependent stiffness characteristics /
mathematic model /
bench test
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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]. 振动与冲击, 2012, 31(22): 66-70
Jiang Haobin Du Yingjun Hu Junxiu.
Study on stroke dependent stiffness characteristicsof a new type integrated suspension strut[J]. Journal of Vibration and Shock, 2012, 31(22): 66-70
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脚注
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