摘要
汽车运行过程中,排气系统的振动能量会经由吊挂传递到车体上,引起驾驶室的振动和噪声。根据多自由度系统的模态分析理论,通过合理设计悬挂点位置,可以有效控制排气系统对车体的振动能量传递。模态分析和有限元技术是结构动力学中的两大基石,结合这两大技术对排气系统的悬挂点位置进行设计。首先建立排气系统的有限元仿真模型,并进行模态实验,用LMS test.lab的PolyMax法识别相应的模态参数,通过计算自由模态和实验自由模态之间的MAC(模态判定准则)值来验证仿真模型的可行性;然后采用模态分析法对排气系统的悬挂点位置进行设计,并进行相应的模态、静力和动力仿真分析,验证悬挂点位置的合理性。采用排气系统的有限元仿真模型来设计其悬挂点的位置,大大减少了试验次数和研发成本,缩短了开发周期,提高了汽车的NVH性能。
During the running process of the automobile, exhaust system’s energy of vibration will be delivered to the body through the hangers, which will induce the vibration and noise to the cab. By the modal analysis theory of multi degree of freedom system, the exhaust system’s vibration energy transmitted to the body could be effectively controlled by the reasonable design of hangers location. Modal analysis and Finite Element Technology, two cornerstones to the structural dynamics analysis, were combined to design the hangers location of exhaust system. First, the exhaust system’s finite element simulation modal was built, and a modal experiment was performed and the modal parameters were distinguished by LMS test lab’s PolyMax. The modal’s feasibility was tested by the value of MAC（Modal Assurance Criterion） between the computational free modal and experimental free modal; Next, the modal analysis method was employed to design hangers location of the exhaust system, and the rationality of the hangers location was verified through modal, static and dynamic simulation analysis. The finite element simulation model of the exhaust system was used to design the hangers location, which greatly reduced the number of tests and research costs, shortened the development cycle, and improved the NVH performance of vehicle.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2014年第4期796-801,共6页
Journal of System Simulation
基金
吉林省科技发展计划项目(201205021)
关键词
排气系统
仿真模型
实验验证
悬挂位置
计算验证
exhaust system
simulation modal
experimental verification
hangers location
computational verification
