Material Property Identification of Damper Constrained by Thin Foil and Its Application to an Automotive Vehicle

Damper is frequently used to suppress panel vibration and related vehicle interior noise. Unlike an unconstrained damper, a method to find material properties of a constrained damper is more complicated. This study presents a verified method for obtaining material properties of a constrained asymmetrical damper. The most important material parameters of this constrained damper are shear modulus, shear factor, and of course damping loss factor. The paper provides newly corrected equations to give proper numerical values of these parameters. The difference of natural frequencies between the test and the simulation using the estimated values is about 2 %, which shows that the estimation method is correctly presented. Important characteristics such as shear motion and wavelength of a composite beam constrained by a damper are also investigated. Finally, vibration response of a vehicle roof with a constrained damper is measured and is compared to the simulation. It is noticed that the correlation is much improved, comparing with the simulation based on old material properties.

Automated summary

This study presents a verified method for obtaining material properties of a constrained asymmetrical damper, including shear modulus, shear factor, and damping loss factor. The difference of natural frequencies between the test and the simulation using the estimated values is about 2%, showing the accuracy of the estimation method.