Dynamic Modal Correlation of an Automotive Rear Subframe, with Particular Reference to the Modelling of Welded Joints

Q2 Physics and Astronomy Advances in Acoustics and Vibration Pub Date : 2017-04-03 DOI:10.1155/2017/8572674

Vincenzo Rotondella, A. Merulla, A. Baldini, S. Mantovani

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引用次数: 14

Abstract

This paper presents a comparison between the experimental investigation and the Finite Element (FE) modal analysis of an automotive rear subframe. A modal correlation between the experimental data and the forecasts is performed. The present numerical model constitutes a predictive methodology able to forecast the experimental dynamic behaviour of the structure. The actual structure is excited with impact hammers and the modal response of the subframe is collected and evaluated by the PolyMAX algorithm. Both the FE model and the structural performance of the subframe are defined according to the Ferrari S.p.A. internal regulations. In addition, a novel modelling technique for welded joints is proposed that represents an extension of ACM2 approach, formulated for spot weld joints in dynamic analysis. Therefore, the Modal Assurance Criterion (MAC) is considered the optimal comparison index for the numerical-experimental correlation. In conclusion, a good numerical-experimental agreement from 50 Hz up to 500 Hz has been achieved by monitoring various dynamic parameters such as the natural frequencies, the mode shapes, and frequency response functions (FRFs) of the structure that represent a validation of this FE model for structural dynamic applications.

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汽车后副车架的动态模态关联，特别是焊接接头的建模

本文对汽车后副车架的试验研究和有限元模态分析进行了比较。在实验数据和预测之间进行了模态关联。本数值模型构成了一种预测方法，能够预测结构的实验动态行为。用冲击锤对实际结构进行激励，并通过PolyMAX算法收集和评估副车架的模态响应。副车架的有限元模型和结构性能均根据法拉利公司的内部规定进行定义。此外，还提出了一种新的焊接接头建模技术，该技术是ACM2方法的扩展，该方法适用于动态分析中的点焊接头。因此，模态保证准则（MAC）被认为是数值实验相关性的最佳比较指标。总之，从50 Hz高达500 Hz是通过监测各种动态参数实现的，如结构的固有频率、振型和频率响应函数（FRF），这些参数代表了该有限元模型在结构动力学应用中的验证。

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Advances in Acoustics and Vibration ACOUSTICS-

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期刊介绍： The aim of Advances in Acoustics and Vibration is to act as a platform for dissemination of innovative and original research and development work in the area of acoustics and vibration. The target audience of the journal comprises both researchers and practitioners. Articles with innovative works of theoretical and/or experimental nature with research and/or application focus can be considered for publication in the journal. Articles submitted for publication in Advances in Acoustics and Vibration must neither have been published previously nor be under consideration elsewhere. Subject areas include (but are not limited to): Active, semi-active, passive and combined active-passive noise and vibration control Acoustic signal processing Aero-acoustics and aviation noise Architectural acoustics Audio acoustics, mechanisms of human hearing, musical acoustics Community and environmental acoustics and vibration Computational acoustics, numerical techniques Condition monitoring, health diagnostics, vibration testing, non-destructive testing Human response to sound and vibration, Occupational noise exposure and control Industrial, machinery, transportation noise and vibration Low, mid, and high frequency noise and vibration Materials for noise and vibration control Measurement and actuation techniques, sensors, actuators Modal analysis, statistical energy analysis, wavelet analysis, inverse methods Non-linear acoustics and vibration Sound and vibration sources, source localisation, sound propagation Underwater and ship acoustics Vibro-acoustics and shock.