Optimized Chassis Stability Relative to Dynamic Terrain Profiles in a Self-Propelled Sprayer Multibody Dynamics Model

IF 1.2 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
Bailey Adams, M. Darr, Aditya Shah
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引用次数: 1

Abstract

Highlights This study presented a new optimization methodology using a prismatic joint with high stiffness and damping. The virtual suspension model contained the main bodies, an optimization subsystem, and a free-floating cylinder. Under aggressive terrain, an optimized chassis platform resulted in a 19.5% increase in boom height stability. Abstract. Multibody dynamics (MBD) models are continuing to be valuable for engineering design and product development, especially regarding subsystem optimization. Most MBD optimization processes begin with a sensitivity analysis of treatment factors and levels to understand how uncertainty in model inputs can be attributed to different sources of uncertainty within model outputs; however, this study developed a new MBD methodology to automatically determine the optimized dynamic chassis suspension responses on each corner of the vehicle from a single simulation for a self-propelled sprayer model as the chosen application use-case. This technique leveraged a prismatic joint (with a high spring stiffness and damping coefficient) connected between the chassis mainframe and the simplified optimization tire to create a distance constraint that held the chassis body at a near-consistent height above the ground. Then the solver optimized the response of the chassis suspension system to maintain a stable chassis platform relative to the terrain beneath it as the vehicle traversed across dynamic terrain conditions. This optimization response was also accomplished by replacing the baseline chassis suspension components with a free-floating cylinder, which permitted the unrestricted, optimized motion needed to keep the chassis body at a near-level position with respect to the roll and pitch profiles of the terrain. For a simulation with an aggressive terrain configuration, the analysis showed that an optimized suspension system resulted in a 46% decrease in operator comfort and a 19.5% increase in overall boom height stability as the boom height control system better maintained a dynamic position closer to the specified target height. Keywords: Boom height, Chassis suspension, Multibody dynamics (MBD), Optimization, Prismatic joint, Simulation, Terrain.
自走式喷雾器多体动力学模型中基于动态地形剖面的底盘稳定性优化
本研究提出了一种采用高刚度、高阻尼的移动关节的优化方法。虚拟悬架模型包含主体、优化子系统和自由悬浮气缸。在恶劣地形下,优化后的底盘平台使臂架高度稳定性提高了19.5%。摘要多体动力学(MBD)模型在工程设计和产品开发中,特别是在子系统优化方面,仍然具有重要的价值。大多数MBD优化过程始于对处理因素和水平的敏感性分析,以了解模型输入中的不确定性如何归因于模型输出中的不同不确定性来源;然而,本研究开发了一种新的MBD方法,可以通过对自行喷雾器模型的单一仿真,自动确定车辆每个角落的优化动态底盘悬架响应。该技术利用连接底盘主机和简化优化轮胎之间的移动关节(具有高弹簧刚度和阻尼系数)来创建距离约束,使底盘车身保持在离地面几乎一致的高度。然后,求解器对底盘悬架系统的响应进行优化,使车辆在穿越动态地形条件时,保持底盘平台相对于其下方地形的稳定。通过将底盘悬挂组件替换为一个自由浮动的圆柱体,可以实现不受限制的优化运动,从而使底盘车身相对于地形的横倾和俯仰轮廓保持在接近水平的位置,从而实现了优化响应。对于具有恶劣地形配置的仿真,分析表明,优化的悬架系统使操作人员的舒适度降低了46%,而整体臂架高度稳定性提高了19.5%,因为臂架高度控制系统更好地保持了更接近指定目标高度的动态位置。关键词:臂架高度,底盘悬架,多体动力学,优化,移动关节,仿真,地形
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