On model of gearbox noise and dynamic transmission error

• Gearbox is an important noise source in automotive industry. Dynamic Transmission Error(DTE) describes the dynamic behaviour of the complete gear system and is closely related tothe vibrations of, and hence the noise radiated from, a gearbox. The coherence between DTEand noise radiated has been investigated previously and promising results have been obtained.The paper focuses on the models of DTE and the gearbox noise and the relation betweenthem. In order to understand the behaviour of the signals, a simple model is drawn whereDTE is modelled as the excitation source of a gear system. When the speed of rotation is notextremely high, DTE is expected to be independent of the speed of rotation when theobservation points are located on the wheel. On the other hand, the radiated sound isexpected to increase at the rate of 6 dB per double of the rotation speed, although a bigfluctuation is also expected due to the influence of the shifted frequency and hence thedifferent transfer function. Experimental data is analysed. The dynamic transmission errormeasured on a truck gearbox is separated into deterministic parts and a stochastic part. Theapplied torque has little influence on the averaged DTE of the whole gear because of the highstiffness. However, when the averaged DTE of a single tooth is concerned, the influence ofthe applied torque is rather obvious. The predicted trend of the radiated sound pressure isalso seen in the measured data.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

Nyckelord

Vehicle engineering

Farkostteknik

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