A stand for studying the structural transmission of noise through the suspension elements of a power unit of a vehicle

摘要

The stand for studying and separating the contributions of noise sources to the sound field of wheeled vehicles contains a semi-anechoic chamber with a sound-reflecting floor, as well as a dynamometer stand with running drums and a support connection elimination device. The support communication exception device is made in the form of a tripod formed by a base, a stand and bracket. The base is formed by hollow legs parallel to the floor of the anechoic chamber, connected to form a tripod at an angle of 120 ± 10 °. The stand is mounted on one of the legs of the base orthogonally to the floor of the anechoic chamber. Each of the legs of the base is made equipped with a rubberized wheel, while the base legs, from the number of the legs spaced from the equipped stand, are made with mounting rings. The bracket is mounted at the end of the stand remote from the base and is formed with the possibility of attaching the power unit suspension bracket previously disconnected from the body. the rings are made located with an offset to the periphery of the base, formed with the possibility of fixing the device for excluding the support connection during the test. ND provides high reliability estimates of the degree of influence of connecting solid support vibrational bonds on the transmission of vibrational vibrations. At the same time, the support connection exclusion device included in the inventive stand provides reduced laboriousness of the preparatory work preliminary tests.