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摘要虚拟样机技术在汽车多体动力学的研究中越来越受到重视，利用此技术可以有效地减少汽车研发所需的时间，大幅度降低试验的成本，同时在很大程度上提高产品的质量。本文采用ADAMS/Car软件对商用车进行性能的仿真分析。
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首先，基于空气悬架的弹簧特性曲线，建立空气悬架，再通过Hyperworks软件生成模态中性文件的流程，建立弹簧支架的柔性体模型，再对其进行模态分析和截取，得到准确的弹簧支架的中性文件。
其次，建立好扭杆弹簧的前悬架和空气弹簧的后悬架，并对其前、后悬架进行K.C分析，验证车轮定位参数以及悬架刚度参数满足汽车设计的总体要求，并为后面的汽车的操纵稳定性和平顺性分析打好基础。
接着，建立起整车模型并进行装配及参数的调整，所建模型包括：前后悬架模型，齿轮齿条转向系统模型，横向稳定杆模型，轮胎模型，车身模型，动力装置系统模型等。
最后，按照国家汽车试验的标准，对整车进行操纵稳定性进行仿真试验，并进行了关于随机路面的平顺性仿真试验。仿真结果显示：此款商用车不足转向性能良好，操纵轻便，操纵性强，平顺性能良好，人体舒适度高。
毕业论文关键词： 商用车，K.C分析，操纵稳定性，平顺性，刚柔耦合
毕业设计说明书（论文）外文摘要
Title Research on commercial vehicle air suspension technology
Abstract
Applying virtual prototype technique in the study of vehicle multi-body dynamics is getting more and more important, which can effectively reduce the research of the vehicle by time, greatly reduce the experiment cost, but also greatly improved the quality of the products. The article use the ADAMS/Car software to simulate and analyze the commercial vehicle.
Firstly，using the spring’s characteristic curve to build the air spring and using Hyperworks software suspension to generate the modal neutral file process and the flexible body model of spring support .Then spring bracket’s accurate modal neutral files are generated.
Secondly, analyze the K.C of the torsion bar spring front suspension and air spring rear suspension to verify that the wheel alignment parameters and suspension stiffness parameters meet the general requirements of automobile design, which lay a good foundation of the car's handling stability and ride comfort analysis.
Thirdly, the entire vehicle model is created and modified .it consists of eight subsystems: front/rear suspension system, steering system, stabilizer bar system ,front/rear tire system ,body system, braking system and powertrain system . before simulation ,some overall parameters need to adjust.
At last, according to the national standards, six handling stability simulations and the ride comfort simulations are carried out ,they are steady static circular test, pylon course slalom test，steering step test, steering impulse test, cornering with steer release test，steering portability test，and the ride comfort test of random road test and then processing these results, evaluating these parameters according to national standard. The results show that the kind of commercial vehicle has better off-road characteristics ,good maneuverability good ride performance and convenient operation, at the same time transient test is sensitive and rapid reacted, which can make people feel comfortable.
Key words: Commercial vehicle , K.C analysis, handling stability, ride comfort, rigid flexible coupling
目录
1. 绪论 1
1.1 研究背景 1
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