基于AMESim自卸车油气悬架输出特性建模分析

自卸车载重大且工作环境恶劣,需要结构简单且具有良好减振缓冲作用的悬架结构,油气悬架很好地满足了以上需求而被广泛应用。根据单气室油气悬架结构特点,搭建输出特性数学分析模型;根据数学模型,基于AMESim建立单缸油气悬架的仿真模型,并搭建油气悬架试验台;对油气悬架在缓慢加载试验和周期性加载试验中的特性进行对比分析,并对模型参数进行修正。分析结果可知:在载荷和摩擦力差值比较小时,摩擦力的影响不可忽略,其静行程对比初始设计行程有明显变化;随着温度升高,整体拉力输出力有减小的趋势,而压力有增高的趋势;在行程比较大时,由于压强和活塞杆搅动的影响,油液中将溶解部分气体,将导致油液整体弹性模量的下降,且对输出结果的影响比较明显,同时对流量系数进行修正;油液可压缩弹性模量取值1 000 MPa,流量系数0.90~0.92比较符合实际情况。

Modeling and Analysis of Hydro-pneumatic Suspension Output Characteristics on Dump Truck Based on AMESim

Dump truck has load heavy and poor working conditions,which needs a suspension with simple structure and good cushioning effect.The hydro-pneumatic suspension meet the above requirements is widely used.According to the structural characteristics of single chamber hydro-pneumatic suspension,the output characteristics mathematical model was built.According to the mathematical model,the simulation model was built based on AMESim,and the test rig of the suspension was set up.The characteristics of slow loading experiments and periodic excitation loading experiments were compared and analyzed,and the model parameters were corrected.The results show that the effect of friction force cannot be neglected when the difference between load and friction force is smal,the static stroke has obvious change compared with the initial design stroke;as the temperature increasing,the output force of the whole tension decreases;when the stroke is relatively large,due to the impact of pressure and piston rod agitation,the oil will dissolve part of the gas,will lead to the decline of the overall elastic modulus of oil,and the effect to the output is obvious;the flow coefficient is corrected;it is in line with the actual situationoil when the compressible elastic modulus value is 1 000 MPa and the flow coefficient is 0.90~0.92.