in this paper the interior noise level of a vehicle due to structural vibration, named structure borne noise, as a part of nvh analysis has been investigated. first structural analysis is performed and vibrational behavior of structure carried out due to power plant excitations. then interior acoustic cavity response for such excitation and resultant noise is determined. vibrational analysis is...

In this paper an experimental-numerical approach is presented to tackle the vibro-acoustic characterization of composite sandwich structures. A novel experimental setup allows for fast and comprehensive understanding of the NVH behaviour of composite sandwich panels. This information can then be further exploited in numerical model updating and design tools for optimized solutions. Experimental...

In this study, noise and vibration measurements were carried out on a multi-phase 12/8 switched reluctance (SR) motor and analyzed with vibro-acoustic techniques. When evaluating the behavior of electric powertrains for automotive applications, it is necessary to perform a vibro-acoustic analysis, particularly in view of the acoustic comfort perceived by the driver and passengers. High frequenc...

The output data from a structure is the building block for output-only modal analysis. The structure response in the output data, however, is usually contaminated with noise. Naturally, the success of output-only methods in determining the modal parameters of a structure depends on noise level. In this paper, the possibility and accuracy of identifying the modal parameters of a simply supported...

This study investigates the low-frequency vibro-acoustic characteristics of a finite locally resonant (LR) plate. A dynamic model LR plate consisting periodic arrays beam-like resonators attached to thin aluminum with simply supported boundary conditions is established, and average vibration response radiated efficiency are theoretically determined by using modal-superposition harmonic-balance ...

Brake Analysis and NVH (Noise, Vibration and Harshness) Optimization have become critically important areas of application in the Automotive Industry. Brake Noise and Vibration costs approximately $1Billion/year in warranty work in Detroit alone. NVH optimization is now increasingly being used to predict the vehicle tactile and acoustic responses in relation to the established targets for desig...

System identification plays a crucial role in structural dynamics and vibro-acoustic system optimization. The followed approach is based on the “Modal Analysis” concept. The Eigenmodes of the system model can be visualized and allow a direct physical interpretation. Using the modal models, design improvements can be predicted and the structure optimized. The present paper not only reviews the t...

One of main NVH (Noise, Vibration and Harshness) deliverables for Chrysler Development System (CDS) is a fully correlated finite element model to be used for the referencing and the target setting process for the future program. To satisfy CDS requirements, a comprehensive feasibility study using the finite element modeling techniques along with the experimental methods to validate the CAE (Com...

This article discusses the use of simulation for analyzing vibro-acoustic behavior radial flux electrical machines under magnetic forces. Numerical enables a systematic investigation electromagnetic Noise, Vibration and Harshness (e-NVH) issues, but requires accurate modeling this despite manufacturing uncertainties. Experimental validation is necessary step to setup multiphysic virtual prototy...