The Noise Structure of Gear Transmission Units and the Role of Gearbox Walls
Snežana Ćirić Kostić
Faculty of Mechanical Engineering – Kraljevo
University of Kragujevac
Faculty of Mechanical Engineering
University of Belgrade
The Noise Structure of Gear
Transmission Units and the Role of
The noise emission of gear units (gearboxes) depends both on the
disturbances (gear meshing, bearing operation, etc) and on the insulating
capabilities and modal behavior of the housing. Natural vibrations of the
housing walls can be prevented or intensified depending on design
parameters. The mechanism of exciting and emission of transmission noise
is defined by carrying out the process of propagation of excitation energy
through the structure of power transmitters and by modal testing of the
housing. The results of vibration and noise testing in comparison to the
results of modal testing give the possibility of identification of noise
structure for the chosen gearbox. Comparison and analysis of the results
obtained lead to precise determination of the causes of creation of the total
spectrum of gear transmission units.
Keywords: gearbox housing, gears, vibration, noise, modal testing
The methodology of identification of the power
transmitter noise structure has been developed.
The initial hypothesis has been confirmed that the
modal structure of natural oscillation of the power
transmitter housing and the spectrum of the noise
emitted are in full correlation.
Disturbance energy in teeth meshes excites
vibrations of the transmission system (gears, shafts, bearings) as well as natural vibrations of the housing.
The housing walls act as an insulator of primary sound
waves, as transmission of secondary sound waves and
as a generator of tertiary (structural) sound waves.
Detailed separation of these sound waves can be
performed by a deeper analysis of the structure of the
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