ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 1 August 2012
Page Count: 6

Mechanical Impedance Measurement on Thin Layer Surface With Impedance Hammer Device

Li, Mingliang
Section of Road and Railway Engineering, Faculty of Civil Engineering and Geosciences, Delft Univ. of Technology, GA Delft,

Molenaar, A. A. A.
Section of Road and Railway Engineering, Faculty of Civil Engineering and Geosciences, Delft Univ. of Technology, GA Delft,

van de Ven, M. F. C.
Section of Road and Railway Engineering, Faculty of Civil Engineering and Geosciences, Delft Univ. of Technology, GA Delft,

van Keulen, Wim
Vankeulen Advies B.V, Multatulistraat 5, 5251 WV Vlijmen,

(Received 27 March 2012; accepted 30 April 2012)

Abstract

The mechanical impedance describes the ability of a structure to resist motion when subjected to a given force. It has received increasing attention as a parameter that could influence the tire/road noise in the medium frequency range (630–1600 Hz). In this study, the impedance hammer device is used for measuring the mechanical impedance on thin layer surface mixture samples in the lab. In the test, the excitation is induced by hitting the sample surface with the hammer. Values of the driving force and acceleration of the vibrating slab are recorded. The mechanical impedance can then be calculated from the ratio of the force to the velocity that is obtained by integration of the acceleration. The influence of the material properties were investigated by comparing the results on different samples. A further measurement of dynamic stiffness on the same material is also discussed and related to the hammer measurement.

Keywords:
mechanical impedance, tire/road noise, thin layer surface

Paper ID: JTE20120089
DOI: 10.1520/JTE20120089
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