Analysis Noise Vibration of the Gearboxes using Mathematical Models

The paper will review practical techniques and procedures employed to quiet gearboxes units. The gearbox noise problem solution is focused on improvement of gear design, on verification of its mathematical models on the radiated noise and determination of the gears contribution to the vehicle overall noise levels and on analytical and/or numerical computer-based tools needed to perform signal processing and diagnostics of geared axis systems. This paper prefers solving the gear noise problem that enclosure as a means to reduce radiated noise, which using math model to estimate effect on the sound pressure level. All the analytical methods are based on the way to build up modal parameter of gear box. The paper will review the progress in technique of the gear angular vibration analysis and its effect on gear noise due to the self excited vibration. The presentation will include some sample of model in 3D and the real one.