铰接式运输车转向系统动态特性及应力分析
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摘要
针对履带车辆转弯过程中履带受到较大的侧向力而影响转向机构安全的问题,设计了液压驱动的铰接转向系统。根据运动学理论推导了履带车辆转向过程的力学模型,搭建了转向机构的动力学和强度分析耦合仿真模型。模拟了转向过程中车辆的动力学规律,研究了不同工况下铰接架刚度的变化,对不满足安全性要求的区域进行了改进。可以看出:在转向过程达到最大角度35°时,转向机构受力存在较大的突变;同时铰接处存在应力集中;改进后的铰接转向机构比原机构更能满足各种工况下的刚度强度要求。
In order to solve the problem that the steering system is unsafe due to the lateral force on the track when the tracked vehicle is turning,the hydraulically-driven articulated steering system is developed.Based on the kinematics theory,the mechanical model of the tracked vehicle's steering process is derived,and the coupling simulation model of dynamics and strength is set up.The dynamic law during the steering process is simulated,the stiffness changes of the articulated frame under different working conditions are explored,and the areas unable to meet the requirements of safety are improved.It can be seen that during the steering process when the angle is at the maximum of 35°,there is a large mutation in the force of the steering system,and stress concentration can be found at the joint.Compared with the original system,the improved articulated steering system reaches the standards of stiffness and strength under various working conditions.
In order to solve the problem that the steering system is unsafe due to the lateral force on the track when the tracked vehicle is turning,the hydraulically-driven articulated steering system is developed.Based on the kinematics theory,the mechanical model of the tracked vehicle's steering process is derived,and the coupling simulation model of dynamics and strength is set up.The dynamic law during the steering process is simulated,the stiffness changes of the articulated frame under different working conditions are explored,and the areas unable to meet the requirements of safety are improved.It can be seen that during the steering process when the angle is at the maximum of 35°,there is a large mutation in the force of the steering system,and stress concentration can be found at the joint.Compared with the original system,the improved articulated steering system reaches the standards of stiffness and strength under various working conditions.
引文
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[9]王春月,白海清,原永亮.基于ADAMS的一种新型锁紧机构的优化设计[J].机械设计,2016,33(7):35-38.
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[2]Okello J A,Watany M,Crolla D A.A theoretical and experimental investigation of rubber track performance models[J].Journal of Agricultural Engineering Research,1998,69(1):15-24.
[3]Yamakawa J,Watanabe K.A spatial motion analysis model of tracked vehicles with torsion bar type suspension[J].Journal of Terramechanics,2004,41(2):113-126.
[4]Murakami H,Watanabe K.A mathematical model for spatial motion of tracked vehicles on soft ground[J].Journal of Terramechanics,1992,29(1):71-81.
[5]李阳.铰接式履带车辆行驶性能研究[D].长春:吉林大学,2011.
[6]张海龙.多种工况下履带车辆主动轮应力测试系统研究[D].太原:中北大学,2014.
[7]王洪涛.履带车辆差速转向载荷比受软土地面条件影响的实验研究[D].哈尔滨:东北农业大学,2014.
[8]王凯.50型轮式装载机液压系统工作特性与能耗分析[D].长春:吉林大学,2011.
[9]王春月,白海清,原永亮.基于ADAMS的一种新型锁紧机构的优化设计[J].机械设计,2016,33(7):35-38.
[10]闵德瑞,赵云杨,曙光.基于虚拟样机技术的汽车等速驱动轴传动效率的分析[J].机械设计,2016,33(4):60-63.
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