Study of Cavity Modal Damping: A Numerical Methodology for Acoustic Evaluation Using the Finite Element Method in Vehicle Bodies Based on Experimental Tests
Keywords:Finite Element Methods, Acoustic Control, Trimmed body, Numerical Experimental Correlation, Modal Damping,
AbstractThis work focuses on finding a numerical solution for vehicle acoustic studies and improving the usefulness of the “Numerical experimental” parameters for the development stage of a new automotive project. Specifically, this research addresses the importance of cavity modal damping for vehicle exerts during numerical studies. This research then seeks to suggest standardized parameter values of modal cavity damping in vehicular acoustic studies.
This standardized value of modal damping cavity is of great importance for the study of vehicular acoustics in the automotive industry because it would allow the industry to begin studies of the acoustic performance of a new vehicle early in the conception phase with a reliable estimation that would be close to the final value measured in the design phase. It is common for the automotive industry to achieve good levels of numerical-experimental correlation in acoustic studies after the prototyping phase because this phase can be studied with feedback from the simulation and experimental modal parameters.
Thus, this research suggests values for cavity modal damping, which are divided into two parts due to their behavior:
?(x) =-0.0126(x-100)+6.15 as a variable function to analyze up to 100 Hz and 6.15% of cavity modal damping constant for studies between 30 Hz and 100 Hz.
The sequence of this study shows how we arrived at these values.
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