Thesis topic proposal
László Lovas
Study of the loosening of wheel bolts


Institute: Budapest University of Technology and Economics
transportation and vehicle engineering
Kálmán Kandó Doctoral School of Transportation and Vehicle Engineering

Thesis supervisor: László Lovas
Location of studies (in Hungarian): Department of Vehicle Elements and Vehicle-Structure Analysis
Abbreviation of location of studies: JSZT

Description of the research topic:

In Hungary, upon statistics two bus or truck wheels roll away from the moving vehicle each month. Both the freely rolling wheels and the uncontrollable heavy vehicles are very dangerous in the traffic. Usually, the wheels roll away because of the automatic self-loosening of the wheel bolts.

Goal of the research:
Studying the friction process on the thread and under the nut, with load varying in time and orientation. Understanding the deformation on the thread and under the nut. Understanding the unscrewing process of a loose nut.

Work to be done:
Survey of the scientific literature: 1 year
Numerical model building: 1 year
Design of experimental setup: 0,5 year
Measurements, study and discussion of the results 1 year
Writing the thesis: 0,5 year

Expected scientific results:
Improved model for bolt unlocking. Method for estimating the risk of wheel nut self loosening.

Required language skills: English
Recommended language skills (in Hungarian): German or French
Further requirements: 
- good knowledge of 3D CAD systems
- good knowledge of Finite Elements Analysis theory
- good practice of Finite Elements Analysis softwares
- fluent German or French is an advantage

Number of students who can be accepted: 1

Deadline for application: 2018-07-05

All rights reserved © 2007, Hungarian Doctoral Council. Doctoral Council registration number at commissioner for data protection: 02003/0001. Program version: 2.2358 ( 2017. X. 31. )