Search Results

A new experimental method, that enables to estimate the body and driveline sensitivity to unit transmitting error of a hypoid gear for automotive rear axle gear noise, has been developed. Measurements were made by exciting the tooth of the drive-pinion gear and that of the ring gear separately using the special devices designed with regard to simulation of acceleration and deceleration. The characteristic of this method is to estimate the forces at the contact point of the gears. Estimation of these forces is carried out under the condition that the higher stiffness is provided by the tooth of the drive-pinion gear and that of the ring gear, compared with the stiffness of the driveshafts and that of the propeller shaft etc., and relative angular displacement of the torsional vibration between the teeth of the drive-pinion gear and those of the ring gear is constant.

An experimental method for the reduction of the steering wheel vibration, occurring at high speed cruising and/or at engine idling, is described. The reduction of the vibration can be achieved by increasing the resonant frequency of the steering system, which is constructed of a steering wheel, steering column, its support member and so on. Mechanical impedance methods were applied to predict the resonant frequency by means of converting the diametrical moment of inertia of the steering wheel into an equivalent mass. This method provides an insight into how design should be changed to obtain further reduction of the steering wheel vibration. Practical applications are also discussed.

In order to reduce the interior noise of a vehicle with a four-cylinder engine, investigations were made using finite element and vector methods, acoustic intensity testing and holography technique. The investigation resulted in inclination of the engine mounting, design changes to the front suspension member, a shock absorber engine mounting, structural modifications to reduce body panel vibration and a new engine mounting to insulate high frequency engine vibration.