Development of an Indoor Noise Test Procedure for Trucks

An alternate, indoor, noise test procedure for truck exterior noise is being developed in order to overcome the weather problems associated with the presently employed outdoor test method. The feasibility of a reverberation room measurement of sound power level has been demonstrated through a series of comparative indoor and outdoor measurements for several vehicles. An indoor test procedure has been broadly defined and an experimental effort is continuing to complete its development and to demonstrate its equivalence to the outdoor passby test.