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| The Close Proximity Method (CPX) is a
method based on test tyre rolling on the road or the test track surface
with measuring microphones located close to the tyre surface. In the CPX
method, the average A-weighted sound pressure levels emitted by two or
four specified reference tyres are measured over an arbitrary or a
specified road distance, together with the vehicle testing speed. These
data are collected by at least two microphones, located close to the
tyres. For this purpose, a special test vehicle as shown in figure is
constructed. Two uniquely different reference tyres have been selected
in order to represent the tyre/road characteristics which are to be
studied. This project is collaborated
with Community of Tomorrow, Saskatchewan Highway and Transportation
and Saskatchewan Scrap Tire Corporation. |
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