NVH comfort is a key quality feature of vehicles that directly influences a potential customer’s purchase decision. Society's growing environmental awareness and legal requirements to reduce CO2 emissions are leading to increasing electrification of the powertrain. As a result, electric axle systems are increasingly being used, presenting new challenges for NVH development. In particular, the superimposed load cases from the tire-road noise excitation that is present anyway and the additional high-frequency excitation of the electric drive are worth mentioning. Chassis mounts have a significant influence on NVH comfort and driving dynamics and form therefore an integral part of chassis optimization. The mechanical properties of elastomer mounts, which are the focus of the investigations in this work, are determined by the elastomer materials used and the mount geometry. To describe the required material properties of hyperelasticity and viscoelasticity, the use of phenomenological models is expedient. On the one hand, the models can be derived according to the classical approach, on the other hand, the models of fractional derivatives can be used. This creates the need to investigate these models in terms of their accuracy for approximating the dynamic behavior in the high-frequency range. In addition, a holistic approach to numerical investigations is required to evaluate different mount designs in early development phases based on simulation. In order to quantify the influence of the electric drive and to validate the simulation models, suitable approaches to experimental investigations must be developed. Against this background, this work describes a holistic methodology to consider electric axle drives in the design of chassis mounts. This methodology is based on the guideline VDI 2206 and is designed as a V-model with component, system and full vehicle levels. In addition, the methodology derives approaches for simulation-based design of chassis mounts and subsequent test-based integration into the overall system. Following the development of the methodology, it was verified on the component and system level using the example of an electric axle of a fully electric commercial vehicle. By applying the methodology, the usability of the developed models and the manufactured drum shells for tire-road noise excitation was demonstrated. In summary, the work provides an improved starting point for the development of new mount concepts with respect to superimposed noise excitation.
Einfluss von elektrischen Achsantrieben auf die Auslegung von Fahrwerkslagern
Influence of electric axle drives on the design of chassis mounts
2024-01-01
1 Online-Ressource : Illustrationen pages
Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2024; Aachen : ika, Schriftenreihe Automobiltechnik 1 Online-Ressource : Illustrationen (2024). = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2024
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