Against the background of the progressively shortened development cycles in the automotive market sector and the simultaneously increasing customer demands on the vehicle noise behavior, the need for CAE- based methods regarding the analysis and optimization of noise transfer at early stages is growing. Moreover, due to the proceeding electrification of the powertrain, the masking effect of internal combustion engine noises decreases, whereby tire road noise becomes more and more prominent in the vehicle interior. For the design of tire road noise, focusing the structure borne noise transfer of the chassis turns out to be sensible amongst others. Therefore, CAE- based methods for the optimization of tire road noise transfer within the chassis gain more and more importance. Based on this motivation, a simulation methodology is developed in this thesis, which enables at all stages of the development process an improvement as well as an evaluation of the chassis concerning tire road noise transfer. In doing so, the evaluation can be performed on different vehicle system levels. The simulation methodology fundamentally consists of a CAE- based model, that represents the relevant transfer paths of the chassis and builds up the basis for evaluations on the subsystem level by means of suitable physical interface quantities. In order to conduct evaluations on the total vehicle level, the model can be coupled with the vibroacoustic transfer functions of the vehicle body. Regarding the improvement of tire road noise transfer, the methodology includes an optimization process, which is aimed at modifying the chassis with regard to the component stiffnesses. Due to the characterization and the corresponding requirements, the development of the methodology results in a need for research containing the physical design of the subsystem interfaces on the one hand and the design of the optimization process on the other hand. Regarding the design of the subsystem interfaces, suitable sub- methods are developed for the vibration excitation of the CAE- based model as well as for the coupling with the transfer functions. Based on this and with the help of additional investigations, an entire simulation procedure is developed. In terms of the optimization process design, suitable optimization tools and sub- methods are identified and combined to enable an efficient elaboration of improvement measures considering conflicts of aims with vehicle dynamics. The thesis is closed with an exemplary use case in order to evaluate both, the prediction quality of the entire simulation procedure and the efficiency of the optimization process.
Modulare Simulationsmethodik zur Analyse und Optimierung der Reifen-Fahrbahngeräuschübertragung; Ausgabe mit korrigierter ISBN
Modular simulation methodology for the investigation and optimization of tire road noise transfer
2022-01-01
1 Online-Ressource : Illustrationen, Diagramme pages
Dissertation, RWTH Aachen University, 2022; Aachen : Ika, Schriftenreihe Automobiltechnik 1 Online-Ressource : Illustrationen, Diagramme (2022). = Dissertation, RWTH Aachen University, 2022
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