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首页> 外文会议>SAE Noise and Vibration Conference and Exhibition >Extensive Correlation Study of Acoustic Trim Packages in Trimmed Body Modeling of an Automotive Vehicle
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Extensive Correlation Study of Acoustic Trim Packages in Trimmed Body Modeling of an Automotive Vehicle

机译：汽车车辆修剪车身建模中声饰封装的广泛相关性研究

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摘要

In the automotive sector, the structure borne noise generated by the engine and road-tire interactions is a major source of noise inside the passenger cavity. In order to increase the global acoustic comfort, predictive simulation models must be available in the design phase. The acoustic trims have a major impact on the noise level inside the car cavity. Although several publications for this kind of simulations can be found, an extensive correlation study with measurement is needed, in order to validate the modeling approaches. In this article, a detailed correlation study for a complete car is performed. The acoustic trim package of the measured car includes all acoustic trims, such as carpet, headliner, seats and firewall covers. The simulation methodology relies on the influence of the acoustic trim package on the car structure and acoustic cavities. The challenge lies in the definition of an efficient and accurate framework for acoustic trimmed bodies. Two different approaches to achieve this objective are reviewed. In the first approach, the acoustic trim package is modeled as a set of porous and solid layers represented by finite elements in physical coordinate system. The acoustic trim models update the modal fluid / structure model of the car body and car cavity. The second approach uses impedance surfaces to apply the acoustic absorption of the trim on the car cavity side. It uses a Virtual Kundt’s tube. Both approaches are solved as state of the art modal analysis. The result of the correlation study with measurements provides acceleration and Sound Pressure Level (SPL) results for different configurations and excitations, introducing the Root Mean Squared Deviation (RMSD). The expected difference between the two approaches is obtained. The first approach results in higher correlation accuracy than the second approach, while the second approach has advantages in computational time.
机译：在汽车领域，发动机和道路轮胎相互作用产生的结构噪音是乘客腔内的主要噪音来源。为了提高全球声学舒适性，设计阶段必须提供预测模拟模型。声学装饰对车腔内的噪声水平具有重大影响。虽然可以找到这种模拟的几个出版物，但是需要对测量进行广泛的相关性研究，以便验证建模方法。在本文中，执行完整车的详细相关研究。测量的汽车的声学装饰包包括所有声学饰边，例如地毯，车辆，座椅和防火墙盖。仿真方法依赖于车辆结构和声腔上的声学饰边包装的影响。挑战在于定义声学修剪体的高效和准确框架。综述了两种不同的方法来实现这一目标。在第一种方法中，声学饰边封装被建模为由物理坐标系中的有限元表示的一组多孔和实层。声学修剪模型更新车身和车腔的模态流体/结构模型。第二种方法使用阻抗表面在车腔侧施加装饰的声学吸收。它使用虚拟kundt的管。这两种方法都被解开为艺术模态分析的状态。与测量的相关性研究的结果为不同的配置和激励提供了加速和声压水平（SPL），引入了根均匀平方偏差（RMSD）。获得两种方法之间的预期差异。第一方法导致比第二种方法更高的相关精度，而第二种方法在计算时间方面具有优势。

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