某微客左前门模态分析
魏翠芳
(上海理工大学)
【摘要】汽车在行驶过程中,车门会在发动机运转、路面不平以及高速行驶时风力等的振源激励下产生
振动,
如果这些振源的激励频率接近车门的固有频率,便会发生共振现象,产生剧烈的振动和噪声,造成振动破坏
。利用HyperMesh软件对左前车门进行有限元建模,和用NX
Nastran软件在车门不受任何约束的边界条件下进行模态分析,将计算结果导入HyperView中得到了车门的
固有频率和振型云图,分析计算结果并描述云图。由车门的计算结果分析,所建立的有限元模型较好的反映
了原结构的振动特性,不会发生共振现象等振动破坏。
【关键词】 车门 有限元 模态分析 振型云图
Modal Analysis of the Left Front Door
of Miniature Passenger Car
Wei Cuifang
University of Shanghai for Science and Technology
【Abstract】During the running of a car, the doors will vibrate under the excitation of the engine when the
engine is running, the road surface is uneven, and wind power is running at a high speed. If the excitation
frequency of these vibration sources is close to the natural frequency of the door, resonance will occur, causing
severe Vibration and noise, causing vibration damage.Using HyperMesh software to perform finite element
modeling of front left door, and using the NX Nastran software to perform modal analysis on the door model under
unconstrained boundary conditions, Import the calculation result into HyperView, get the natural frequency and
vibration mode cloud of the door, analyze the calculation result and describe the cloud image. The analysis of the
calculation results of the vehicle doors shows that the established finite element model better reflects the vibration
characteristics of the original structure, will not have vibration damage such as resonance.
Key words: Car door Finite element Modal analysis Vibration cloud
1 引言
前门结构作为独立、综合的转动部件,是白车身结构重要构成部件之一,前
门与车厢共同组成了乘坐密闭空间,应具有良好的振动特性。汽车在行驶过程中,
车门会在发动机运转、路面不平以及高速行驶时风力等的振源激励下产生振动,
如果这些振源的激励频率接近车门的固有频率,便会发生共振现象,产生剧烈的
振动和噪声,造成振动破坏
[1]
。为提高汽车的NVH性能,
必须对车门的固有频率进行分析,通过结构设计与优化避开各种振源的激励频
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