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Master Thesis Project

Title: Developing an Equivalent Static Load (ESL) for CAE Solidity

Subject: CAE Solidity

Background

Going from a traditional static load case looking at one value to assess the vehicle body, to a novel time domain approach evaluating multiple values.

By looking at the distortions of a complete vehicle body, a better understanding of the body characteristics can be reached compared to traditional static load cases such as static torsional stiffness of the vehicle body. This is especially relevant to non-traditional vehicle layouts and electric vehicle architectures. The paved road (cobblestone) is an important test track for Solidity when assessing Perceived Quality. 

When driving a vehicle on a paved road the body response can be measured with the so-called Multi Stethoscope (MSS). The MSS is measuring the distortion in each opening in two diagonals. The distortion is described by the relative displacement in a diagonal direction in the time domain. By applying the Principal Component Analysis (PCA) on the time history of the distortion, a Dominant Motion Pattern (DMP) can be identified. The DMP means that more than 50 % of the deformation states of a given pave time history are similarly based on the MSS results.

Scope

The aim of the master thesis work is to analyze the force vectors belonging to the DMP. Based on this analysis the following question should be answered:

• What do the force vectors have in common, which belong to the same DMP?

• Is it possible to identify a Dominant Force Pattern (DFP) without including the MSS results?
• What is the relation between Dominant Motion Pattern DMP and Dominant Force Pattern DFP?
• The time history of the distortion is condensed into one value by using the Statistical Evaluation Parameter SEP. What is the impact of the SEP on the DMP and DFP?

The results of this work shall enable an ESL definition based on all states belonging to the DMP.

Thesis overview

• Understanding the existing complete vehicle simulation process
• Understanding the existing Python and Matlab scripts
• Developing a new Python script for analyzing the time history of the forces
• Comparing forces vs displacement (DFP vs DMP) after applying the Principal Component Analysis PCA
• Report and presentation

Prerequisites

• Master student in automotive/mechanical/mechatronics engineering
• Interested in structural dynamics and programming
• Knowledge of FEM and programming (Python/Matlab)
• Interested in further work in the automotive industry

Number of students: 1, please apply with CV and cover letter.

Starting date: August 2022. The duration of the thesis work is 20 weeks

For more information please contact:

Jens Weber, Principal Expert Solidity, 0729-888106, jens.weber@cevt.se

 Last application date: 2022-05-31

Apply today. We will perform ongoing selection during the application period. We look forward to hearing from you!

Please note that due to GDPR regulations we can only accept applications sent through the recruitment system, not via email or other channels.