The acoustic ride comfort and the dynamic driving handling of passenger cars have always constituted with a target conflict. Current developments are driving the awareness of quality in the multicultural perception of international customers. The change of individual mobility from conventional vehicles to autonomously driving, electric vehicles creates a strong focus on the perception of tire-road noise. With the target of the predictive consideration and reduction of the rolling noise perceived by the occupant, a development accompanying and methodical approach is formulated. The objectification of the phenomenon is followed by the definition of sectional areas, regarding functional separation and hierarchical responsibilities in the automotive industry. The goal is to forecast and assess tire-road noise for the independently considered subsystem of the front axle, in the context of vehicle dynamics. In this context physical quantities are evaluated with regard to their suitability for the assessment of interior noise, boundary conditions are defined and fused in a test bench. Applications for determining the required forces in the simulation and the overall vehicle are investigated and developed with respect to a holistic, development-accompanying approach. The vehicle, often unknown in the early phase of the development of an axle, is simplified and converted into a generic model. Based on statistical knowledge of previous developed bodies, vehicles are clustered and examined according to the product lines. Resulting vibroacoustic transfer functions are based on statistical analysis. They allow both, forecasts as well as the derivation of force targets for the front axle in the early phase of development. The investigations and validations of the method are based on one-joint and two-joint strut type front axles. Both, the possibility of using it as a development-accompanying quality gate and the benefit of deriving constructive measures through the clear identification of influencing factors are shown. The holistic method enables a significant increase in quality as well as cost savings due to the avoidance of secondary measures and the associated, shorter development time.
Zielformulierung und entwicklungsbegleitende Bewertung von Vorderachsen hinsichtlich des Abrollgeräuschs
Formulation of objectives and development-accompanying evaluation of front axles with regard to the driving noise
2021-01-01
1 Online-Ressource pages
Dissertation, RWTH Aachen University, 2020; Aachen : IKA, Institut für Kraftfahrwesen, RWTH Aachen, Schriftenreihe Automobiltechnik 237/21, 1 Online-Ressource (2021). doi:10.18154/RWTH-2021-02148 = Dissertation, RWTH Aachen University, 2020
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