Acoustic and Vibration Response
Analysis of Heavy-Duty Gearbox
Kamil Rehak , Aleš Prokop , Roman Zajac , and Václav Otipka
Abstract The presented paper deals with determination of acoustic and vibration
response of heavy-duty gearbox housing on the defined force excitation. The analysis is performed by both, numerical and experimental approach. The results from
both approaches are compared to validate numerical approach for the purpose to use
numerical model for design optimization and further for multibody simulations. The
excitation is applied to the area of bearing to simulate the real character of the excitation, which is transmitted from the gear mesh contact stiffness, which is changing due
to actual geometry of teeth in contact, via gears and shafts to bearings and further to
the housing. The same boundary conditions are applied for both approaches. Because
the vibrations and the acoustic emissions are directly related to each other, the surface
normal acceleration in critical locations is compared first. When the surface normal
acceleration is compared, the sound pressure level in defined locations is evaluated.
This article systematically describes the prediction of vibro-acoustics behavior of
heavy-duty gearbox housing by using two different levels of approach, which can
be used for design optimization afterward. The technical experiment with optimized
housing has not been performed yet.
1 Introduction
The rail transport is very often used for the reason of independence from traffic jams,
easy traveling for long distance, safety, but the increasing of passenger comfort
in public rail transport is one of the key points to increase the frequency of their
usage even, e.g., for short distance. The manufacturers of public transport vehicles
intensively deal with the increasing demands of customers and passengers on driving
comfort, ergonomics, thermal comfort and finally on vibration and noise comfort.
The reduction of noise and vibration is very complex task, because of increasing
K. Rehak (B) · A. Prokop · R. Zajac · V. Otipka
Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 616 69
Brno, Czech Republic
e-mail: rehak@fme.vutbr.cz
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_45
443
Analysis of Heavy-Duty Gearbox
Kamil Rehak , Aleš Prokop , Roman Zajac , and Václav Otipka
Abstract The presented paper deals with determination of acoustic and vibration
response of heavy-duty gearbox housing on the defined force excitation. The analysis is performed by both, numerical and experimental approach. The results from
both approaches are compared to validate numerical approach for the purpose to use
numerical model for design optimization and further for multibody simulations. The
excitation is applied to the area of bearing to simulate the real character of the excitation, which is transmitted from the gear mesh contact stiffness, which is changing due
to actual geometry of teeth in contact, via gears and shafts to bearings and further to
the housing. The same boundary conditions are applied for both approaches. Because
the vibrations and the acoustic emissions are directly related to each other, the surface
normal acceleration in critical locations is compared first. When the surface normal
acceleration is compared, the sound pressure level in defined locations is evaluated.
This article systematically describes the prediction of vibro-acoustics behavior of
heavy-duty gearbox housing by using two different levels of approach, which can
be used for design optimization afterward. The technical experiment with optimized
housing has not been performed yet.
1 Introduction
The rail transport is very often used for the reason of independence from traffic jams,
easy traveling for long distance, safety, but the increasing of passenger comfort
in public rail transport is one of the key points to increase the frequency of their
usage even, e.g., for short distance. The manufacturers of public transport vehicles
intensively deal with the increasing demands of customers and passengers on driving
comfort, ergonomics, thermal comfort and finally on vibration and noise comfort.
The reduction of noise and vibration is very complex task, because of increasing
K. Rehak (B) · A. Prokop · R. Zajac · V. Otipka
Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 616 69
Brno, Czech Republic
e-mail: rehak@fme.vutbr.cz
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_45
443