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Computational acoustical models allow automated optimization of tractor design with respect to acoustic properties, which could speed up significantly the design process of tractor cabin prototypes. This article gives insightful prospec-tives to the tractor design process by considering modern computational acoustics technology. Mathematical formul...
Context in source publication
Context 1
... 3: Cross-section of the cabin shows the pressure field inside the cabin and the positions of the sound source and the driver’s head. In this model a simple speaker, modelled as a cavity inside the acoustic domain, excites vibrations. The sound source is due to a forced displacement with amplitude 28 mm on the speaker membrane having area 70686 mm 2 (see Fig. 3). The angle between the membrane surface and the horizontal plane is 45 . The other parts of the speaker are assumed to be rigid surfaces. An acoustically rigid sphere, presented in Fig. 3, acts as a driver’s head. The values of the acoustic pressure field can be observed around the head. The head may cause scattering but it was considered negligible at the interesting frequencies. Penalty method provided by ANSYS is used for transferring the data between the structure and the air-filled domain. The built-in sparce matrix direct solver is used for solving the lin- ear system arising from the discretization of the equations. The simulation results are illustrated in Figs. 4–5. The defor- mations are described as displacement amplitudes in Fig. 4. The pressure field in the air-filled interior of the tractor cabin is presented in Fig. 5.
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