METHOD TO MEASURE NOISE PRODUCED BY VEHICLE TYRES WHEN IN MOTION Russian patent published in 2014 - IPC G01M17/07 

FIELD: measurement equipment.

SUBSTANCE: invention relates to vehicle testing. A series of measurements of noise level produced by a vehicle moving in the test section in the acceleration mode is performed, obtained values are recorded, a diagram of recorded values of the vehicle noise level is developed and the vehicle velocity at crossing the microphone line is defined. A series of measurements are performed in respect to the noise level produced by a vehicle moving in the test section in the free running mode with the velocity equal to a prescribed value so that the velocities obtained at vehicle's crossing the microphone line were the same in both measurement series. The diagram of recorded noise level values of the free running vehicle is developed. The noise produced by the tyres is identified in the total noise level of the moving vehicle by comparing the total noise level values of the accelerating vehicle to the noise level values of the free running vehicle adjusted for the distance specifying the dependence of the noise level change on the distance between a noise source and a noise metre.

EFFECT: identification of noise produced by tyres in the total noise produced by a moving vehicle.

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