Olschewski, Jens
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Publication Access status: Metadata only , Elastokinematic design and optimization of the multi-link torsion axle – a novel rear axle concept for BEVs(2024); This work describes the elastokinematic design and optimization for a new, package space saving rear suspension especially intended for small battery electric vehicles. Mainly for reasons of cost and weight efficiency, the twist-beam axle is widely used, especially in the A and B segments. One of the main disadvantages of twist-beam axles is that they limit the rear package space because of the torsion profile. The basic idea of this work was to reverse the installation direction of the twist-beam axle to create an additional package space for the battery. To obtain an optimized elastokinematic design, a new algorithm was introduced that allows modeling of the elastokinematic behavior of the new mechanism. A Pareto optimization of the body connecting bushing was performed, revealing that a specific spatial orientation enables effective compensation for camber compliance deficits. Finally, the Pareto-optimized elastokinematic design was compared to compliance measurement results of a prototype vehicle equipped with the new suspension concept.Source Type:Article5 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Evaluation of Vehicle Lateral and Longitudinal Dynamic Behavior of the New Package-Saving Multi-Link Torsion Axle (MLTA) for BEVs(2024); To increase the package space for the battery pack in the rear of battery electric vehicles (BEVs), and thus extend their driving range, a novel rear axle concept called the multi-link torsion axle (MLTA) has been developed. In this work, the kinematic design was extended with an elastokinematic concept, and the MLTA was designed in CAD and realized as a prototype. It was then integrated into a B-class series-production vehicle by ADDing masses in different locations of the vehicle to replicate the mass distribution of a BEV. Both objective and subjective vehicle dynamic evaluations were conducted, which included kinematic and compliance tests, constant-radius cornering, straight-line braking, and a frequency response test, as well as subjective evaluations by both expert and normal drivers. These test results were analyzed and compared to a production vehicle. It can be concluded that the vehicle dynamic performance of the MLTA-equipped vehicle is, overall, 0.67 grades lower than that of the comparable production vehicle on a 10-grade scale. According to OEM experts, this deficit can be eliminated by tuning the different components of the MLTA and meeting the tolerance requirements of series production vehicles.Source Type:Article1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Open Access , Mehrlenker-Torsionsachse – Modellierung, Entwicklung und Erprobung einer bauraumsparenden Verbundhinterachse für eine verbesserte Batterieintegration in BEVs der Kleinwagenklasse(2025)The integration of large battery packs into battery electric vehicles poses a particular challenge in the compact vehicle class, as available packagespace is limited by conventional axle designs such as the twist beam axle. To address this issue, the Multi-Link Torsion Axle (MLTA) was developed at the Institute of Automotive Lightweight Design. Its novel kinematic behavior enables optimized vehicle integration and creates additional space for the battery package. This work deals with the modeling, development, and experimental evaluation of the MLTA, with a focus on its elastokinematic behavior. For this purpose, an MBS solver was developed that is capable of modeling and analyzing both the kinematics and elastokinematics of suspension systems. Based on this solver, an MBS model of the MLTA was created. In the next step, a prototype axle was designed, built, and integrated into a test vehicle. The experimental evaluation included KnC-measurements, objective driving tests, and subjective evaluation by experienced test drivers and untrained everyday drivers. For comparison, a production vehicle equipped with additional masses was used to emulate the characteristic mass and center-of-gravity properties of a BEV. The KnC results confirm the potential of the MLTA. Kinematic advantages were observed particularly in wheel-center recession and anti-lift behavior. Weaknesses were found in camber compliance due to deviations of the prototype bushings from the target specifications. However, simulation results show that the desired compliance behavior can be achieved if the specified bushing characteristics are met. Objective driving tests show high agility and a significantly reduced longitudinal acceleration during obstacle crossing compared to the reference suspension. Compared to the reference axle, the MLTA received lower ratings in the subjective evaluation, clearly indicating the need for series-level tuning in future development.Source Type:Doctoral ThesisSeries:Siegener Schriftenreihe AutomobiltechnikVolume number:119 8
