油气悬架阻尼数学模型对比分析  

Comparative Analysis of Mathematical Model of Hydro-Pneumatic Suspension Damping

作　　者：李泽光[1] 李来平[1] 裴洁[1] 魏刚[1] LI Zeguang;LI Laiping;PEI Jie;WEI Gang(Inner Mongolia North Hauler Joint Stock Co.,Ltd.,Baotou Inner Mongolia 014030,China)

机构地区：[1]内蒙古北方重型汽车股份有限公司,内蒙古包头014030

出　　处：《机床与液压》2024年第13期105-109,共5页Machine Tool & Hydraulics

摘　　要：当前针对油气悬缸动力学特性的研究中,弹性力主要采用多变气体状态方程建模,阻尼力则采用薄壁小孔理论建模,由于真实情况中阻尼孔和单向阀的过流厚度都并非薄壁,而是具有一定的厚度,采用薄壁理论会导致模型在一定程度上失真,所以采用短孔过流理论建立阻尼模型,并考虑入口和出口的局部水头损失,重新构建油气悬缸动力学模型。通过施加真实道路采集的振动信号,对比了1/4悬架系统的两种阻尼力模型下的响应与真实的悬缸上支点加速度数据的平均绝对误差MAE和均方根误差RSME,验证了两个模型在低频范围都能较好模拟悬架振动,但中高频存在明显缺失,而短孔过流理论模型在频域上更逼近真实值。In the current research on the dynamic characteristics of hydro-pneumatic suspension cylinder,the elastic force is mainly modeled by the variable gas state equation,and the damping force is modeled by the thin-walled small hole theory.In the real situation,the thickness of the damping hole and the one-way valve is not thin-walled,but has a certain thickness,the thin-walled theory application will lead to the distortion of the model to a certain extent.Therefore,the damping model was established by using the theory of short-hole flow,and the dynamic model of the hydro-pneumatic suspension cylinder were reconstructed by considering the local head loss of the inlet and outlet.The mean absolute error(MAE)and root mean square error(RSME)of the two damping force models were compared with the real acceleration data of the support point on the suspension cylinder.It is verified that both models can simulate suspension vibration well in the low frequency range,but there is a significant deficiency in the medium to high frequency range.The short hole flow theory based model is closer to the true value in the frequency domain.

关 键 词：油气悬缸 阻尼力 薄壁小孔建模 短孔过流建模 频率域 

分 类 号：TH16[机械工程—机械制造及自动化]