硬质路面条件下履带车辆转向模型分析及验证  

Turning Model for Tracked Vehicles on Hard Ground: Analysis and Verification

作　　者：张瑞增 龚建伟[1] 陈慧岩[1] 刘海鸥[1] 卢佳兴 ZHANG Ruizeng;GONG Jianwei;CHEN Huiyan;LIU Haiou;LU Jiaxing(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《兵工学报》2023年第1期233-246,共14页Acta Armamentarii

摘　　要：履带车辆与地面之间的作用关系复杂,基于地面剪切位移的方法通常会用到对时间和位置的积分,模型较为复杂,无法直接应用到车辆的实时控制算法中。通常情况下,履带车辆转向分析会将接地压力看作连续线性分布或者多矩形分布,但是试验和计算结果均表明硬质土壤条件下,履带接地压力为多峰值分布,前述两种分布均不能体现接地压力的真实状态。本文针对上述问题,在前人研究的基础上,对履带接地压力分布进行求解,提出了履带车辆接地压力简化模型。该简化模型更符合硬质路面履带接地压力的真实状态,并被应用于履带车辆转向动力学分析与验证。利用J.Y.Wong提出的垂向负载-剪切位移变化关系解决了垂向压力变化的同时剪切位移计算的问题,提出了履带车辆转向分析模型(以下简称分析模型),试验结果表明该模型有较高的精度。但是其复杂度仍然较高,为了进一步简化模型,借鉴轮式车辆轮胎侧偏角和滑转率的概念,利用履带车辆履带-地面剪切位移关系推导了简化履带车辆动力学模型(以下简称简化模型)。该模型避免了复杂的积分或者求和,显著降低了履带车辆动力学模型的复杂度,能够应用于基于模型的无人驾驶履带车辆轨迹控制方法中,且模型精度接近前述履带车辆转向分析模型。The interaction between tracked vehicles and the ground is complex. In general, methods based on shear stress-shear displacement theory require the integration of time and position, which is complicated and rarely applied to real-time vehicle control algorithms. Turning analysis of tracked vehicles typically assumes that grounding pressure is uniformly or concentratedly distributed.However, the calculations and test results show that the track-ground pressure forms multiple peaks on hard ground. In view of the above problems, based on previous studies, this paper proposes a simplified model of track-ground pressure, which has good consistency with the actual track-ground pressure on hard road surfaces. The model is then applied to the dynamic analysis of tracked vehicle turning. The vertical pressure-shear displacement relationship proposed by J.Y.Wong is employed to calculate the shear displacement when the track-grounding pressure keeps changing. A steering discretized model for tracked vehicles is proposed, and the test results show that the model has high accuracy yet still high complexity. To further simplify the model, the concepts of wheeled vehicle tire slip angle and slip rate are used.Then, a simplified tracked vehicle dynamics model is derived by using the shear stress-shear displacement theory. It avoids complex integration or summation, and can be applied to model-based motion control methods. Besides, it is almost as accurate as the complex steering analysis model.

关 键 词：履带装甲车辆 转向特性 非均布载荷 模型验证 

分 类 号：U469.694[机械工程—车辆工程]