装有液压互联悬架车辆越野性能研究

发布时间：2018-06-05 21:50

本文选题：液压互联悬架 + 台架试验　；参考：《湖南大学》2016年硕士论文

【摘要】：液压互联悬架可以提高车辆的越野性能,即改善车轮接地性能和车身所受扭转载荷。与传统稳定杆相比,液压互联悬架系统的单个车轮运动产生的作用力可以通过液压介质流动方式转移到其他车轮,在特定的车身-车轮运动模态下可获得优越的动力学性能。该系统具有的非线性刚度和阻尼特性,使得车辆在具有较好的舒适性、操纵稳定性的同时,获得卓越的越野性能。目前学术界对互联悬架的研究主要集中在增强车辆的抗侧倾效果,或提高舒适性,但在增强车辆越野性能,改善轮胎接地力方面的研究还不多见。本文通过仿真分析和试验研究的方法,研究了液压互联悬架增强车辆越野性能的机理,对比分析了不同悬架形式之间越野性能的差异,开发了某款越野车的液压互联悬架样车,并进行了相应的实验室试验和道路试验。本文主要研究内容和创新点如下:(1)建立液压互联悬架中的液压系统单元理论模型与动力学特性分析,为车辆性能研究提供理论基础。在液压互联悬架的外特性研究中,首先对液压系统单元结构中流量-压力特性进行瞬态建模分析,建立液压系统单元数学模型。其次,进一步通过台架试验验证了数学模型的准确性,表明该液压系统单元模型能够准确反映液压系统在受到外界不同激励作用下各参量的变化,为整车动力学研究提供理论支撑。最后对液压系统中的阻尼力等力学特性进行了仿真分析,获取了液压系统关键参数对阻尼特性的影响规律。(2)建立匹配液压互联悬架系统的整车动力学时域模型并进行整车越野性能仿真分析。基于液压系统单元模型建立匹配液压互联悬架的整车机械液压耦合的动力学时域模型,研究了扭曲模态下车身-车轮的运动关系,对比分析了不同悬架系统的车辆在扭曲模态下,车身受到的附加扭转载荷以及车轮的接地性能。验证了整车的侧倾刚度目标要求与越野性目标要求两者之间可以有效的平衡,液压参数设计有较大的自由空间。(3)对液压互联悬架试验车和横向稳定杆的原车进行实车的越野性能试验。分析不同悬架系统下的前后轴侧倾角的绝对差值,车身附加扭转载荷和车身质心垂向加速度;分析结果表明,与传统悬架相比,液压互联悬架在提高侧倾稳定性的同时,具有更优越的越野性能。综上所述,本文开发了某款越野车的液压互联悬架样车,研究了液压互联悬架增强车辆越野性能的机理,并进行了道路试验,为悬架的匹配设计提供一定的指导,具有实际的应用价值。
[Abstract]:The hydraulic interconnected suspension can improve the off-road performance of the vehicle, that is, improve the grounding performance of the wheel and the torsional load on the body. Compared with the traditional stabilizer, the force generated by the single wheel motion of the hydraulic interconnected suspension system can be transferred to other wheels through the hydraulic medium flow mode, and the dynamic performance can be obtained under the specific body-wheel motion mode. The nonlinear stiffness and damping characteristics of the system make the vehicle have better comfort and maneuvering stability, and obtain excellent off-road performance at the same time. At present, the research on interconnected suspension mainly focuses on enhancing the anti-roll effect or improving the comfort of the vehicle, but the research on enhancing the off-road performance of the vehicle and improving the tire earthing force is rare. By means of simulation analysis and experimental study, this paper studies the mechanism of the hydraulic interconnected suspension to enhance the off-road performance of the vehicle, compares and analyzes the differences of cross-country performance among different suspension forms, and develops a hydraulic interconnected suspension prototype of a certain type of cross-country vehicle. Laboratory tests and road tests were carried out. The main contents and innovations of this paper are as follows: (1) the theoretical model of hydraulic system unit and the analysis of dynamic characteristics of hydraulic interconnected suspension are established, which provides a theoretical basis for the study of vehicle performance. In the study of the external characteristics of the hydraulic interconnected suspension, the transient modeling and analysis of the flow-pressure characteristics in the hydraulic system unit structure are carried out, and the mathematical model of the hydraulic system unit is established. Secondly, the accuracy of the mathematical model is verified by the bench test, which shows that the unit model of the hydraulic system can accurately reflect the variation of the parameters of the hydraulic system under different external excitations. It provides theoretical support for vehicle dynamics research. Finally, the mechanical characteristics of the hydraulic system such as damping force are simulated and analyzed. The influence of key parameters of hydraulic system on damping characteristics is obtained. The time-domain model of vehicle dynamics matching hydraulic interconnected suspension system is established and the off-road performance of the whole vehicle is simulated and analyzed. Based on the unit model of hydraulic system, the dynamic time-domain model of the mechanical-hydraulic coupling of the whole vehicle matching the hydraulic interconnected suspension is established, and the kinematic relationship between the body and the wheel in the twisted mode is studied. The additional torsional load on the vehicle body and the grounding performance of the wheel are compared and analyzed in the torsional mode of the vehicle with different suspension systems. It is verified that there is an effective balance between the objective requirement of roll stiffness and the requirement of wild target. The hydraulic parameter design has a large free space.) the off-road performance tests of the hydraulic interconnected suspension test vehicle and the original vehicle with the transverse stabilizer rod are carried out. The absolute difference of front and rear axle roll angle, the additional torsional load and the vertical acceleration of body mass center under different suspension systems are analyzed, and the results show that compared with traditional suspension, the hydraulic interconnected suspension not only improves the roll stability, but also improves the stability of the suspension. Has superior cross-country performance. To sum up, this paper develops the hydraulic interconnected suspension prototype of a certain cross-country vehicle, studies the mechanism of the hydraulic interconnected suspension to enhance the cross-country performance of the vehicle, and carries out road tests to provide some guidance for the matching design of the suspension. It has practical application value.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.33

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