Mechanical Impedance Based Vibration Damping Test

2017-01-1879

06/05/2017

Features
Event
Noise and Vibration Conference and Exhibition
Authors Abstract
Content
Traditionally, the damping performance of a visco-elastic material is measured using the Oberst bar damping test, where a steel bar is excited using a non-contacting transducer. However, in an effort to reduce the weight of the vehicles, serious effort is put in to change the body panels from steel to aluminum and composite panels in many cases. These panels cannot be excited using a non-contacting transducer, although, in some cases, a very thin steel panel (shim) is glued to the vibrating bar to introduce ferrous properties to the bar so it can be excited. In the off highway vehicles, although the panels are made of steel, they are very thick and are difficult to excite using the Oberst bar test method. This paper discusses a measurement methodology based on mechanical impedance measurements and has the potential to be a viable/alternate test method to the Oberst bar testing. In the impedance method, the test bar is mounted to a shaker at the center (Center Point method). The damping performance is measured from the frequency response function obtained from the excitation force and the corresponding velocity level, both measured at the same point.
Meta TagsDetails
DOI
https://doi.org/10.4271/2017-01-1879
Pages
5
Citation
Saha, P., "Mechanical Impedance Based Vibration Damping Test," SAE Technical Paper 2017-01-1879, 2017, https://doi.org/10.4271/2017-01-1879.
Additional Details
Publisher
Published
Jun 5, 2017
Product Code
2017-01-1879
Content Type
Technical Paper
Language
English