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基于Simulink气体溶解对油气悬挂输出特性影响分析
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广西高校中青年教师基础能力提升项目(2019KY1258)


Influence Analysis of Gas Dissolution on the Output Characteristics of Hydropneumatic Suspension Based on Simulink
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    摘要:

    油气悬挂结构简单且刚度较高,广泛应用于复杂激励的工程车辆。根据油气悬挂的输出力特点,对构成输出力的各部分进行分析;采用B-W-R真实气体状态方程,考虑气体在油液中的溶解特性,获取阻尼力方程,以此建立油气悬挂输出力的数学模型;根据数学模型,基于Simulink建立仿真模型,分析不同的饱和溶解体积下,考虑溶解特性与否时,气体压力变化和悬挂的阻尼力特点;搭建1/4车辆悬挂模型,分析缓慢静态加载和动态加载下,气体压力和阻尼力的变化,并与仿真结果进行对比分析,验证数学模型的准确性。结果可知:气体压力受溶解性影响较大,压力上升时,由于气体溶解致使剩余气体质量减小,造成压力减小;而压力下降阶段,由于压力减小,气体析出,导致气体压力上升;考虑气体溶解,比未考虑溶解时,悬挂内气体压力的分界点在初始充气压力095 MPa;由于气体溶解特性作用,在腔体的压缩过程,极限状态压力值几乎无变化,而在伸长状态时,则变化较大,极值明显较小,整个过程压力值由初始2 MPa降低至终值15 MPa;仿真结果与试验结果压力变化趋势基本一致,表明基于B-W-R真实气体方程,考虑气体在油液中的溶解和析出的影响,建立的油气悬挂输出力数学模型可靠性较高,为此类设计提供参考。

    Abstract:

    The hydropneumatic suspension structure is simple and has high rigidity, which is widely used in engineering vehicles with complex excitation. According to the output force characteristics of the hydropneumatic suspension, the components of the output force were analyzed. The B-W-R real gas state equation was used to consider the dissolution characteristics of the gas in the oil and the damping force equation was obtained to establish a mathematical model of the output force of the hydropneumatic suspension. According to the mathematical model, based on Simulink, the simulation model was established. The gas pressure change and the damping force characteristics of the suspension under different saturated dissolution volumes were analyzed, considering the dissolution characteristics or not. The quarter vehicle suspension model was built, and the changes of the gas pressure and damping force under slow static loading and dynamic loading were analyzed, which were compared with the simulation results to verify the accuracy of the mathematical model. The results show that the gas pressure is greatly affected by the solubility;when the pressure rises, the mass of the remaining gas decreases due to the gas dissolution, which resulting in a decrease in pressure;while in the pressure decrease phase, the gas pressure rises due to the reduction of the pressure, and the gas pressure rises;considering the gas dissolution, the cutoff point of the gas pressure in the suspension is 0.95 MPa of the initial inflation pressure;when the gas is dissolved, the limit state pressure value is almost unchanged during the compression process of the cavity due to the gas dissolution characteristics, but in the extended state, the change is larger, and the extreme value is significantly smaller;the pressure value of the entire process is reduced from the initial 2 MPa to the final value of 1.5 MPa. The simulation results are basically consistent with the test results, indicating that based on the B-W-R real gas equation, considering the effects of gas dissolution and precipitation in oil, the mathematical model of the output force of the hydropneumatic suspension is highly reliable.It provides reference for such design.

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引用本文

黄镇财,林圣存.基于Simulink气体溶解对油气悬挂输出特性影响分析[J].机床与液压,2021,49(6):36-41.
HUANG Zhencai, LIN Shengcun. Influence Analysis of Gas Dissolution on the Output Characteristics of Hydropneumatic Suspension Based on Simulink[J]. Machine Tool & Hydraulics,2021,49(6):36-41

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  • 在线发布日期: 2022-03-24
  • 出版日期: 2021-03-28