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Invitation to the Doctoral Degree Presentation of Stephanie Kahms

on november 12, 2020 at 10:00 am

We would like to invite you to the doctorate degree presentation of

Stephanie Kahms

on november 12, 2020 at 10:00am

titled:

 „Thermo-Mechanical Modelling of Aircraft Tyres for Transient Manoeuvres“

The presentation will take place on the Mechanical Engineering Campus in Garbsen. Due to the hygiene regulations there will be a limited number of seats, therefore we would like to ask all interested persons to participate via live broadcast by using the following link.

Link to the presentation:

https://flash-server.luis.uni-hannover.de/JW_player/livestream_maschbau2.html

Abstract:

The aircraft tyre links the aircraft and the runway and transmits forces and moments within the contact zone. These forces include propelling and braking forces as well as lateral cornering forces. During the landing process, enormous forces are exerted on the aircraft tyres. Visible tyre abrasion occurs particularly during touchdown, but the following braking process and taxiing affect temperature development and tyre wear as well.

The scope of this work is the modelling of transient processes at the aircraft tyre with the help of simple physical models. Compared to complex FE-models, these have advantages in computation time. A special focus lies on the calculation of the contact forces in longitudinal and lateral direction as well as on the temperature and abrasion calculation under transient conditions such as those occurring during landing or taxiing. For the simulation of the contact forces an extended brush model is used, which is a well-known model for the description of a rolling deformable wheel. Tyre temperatures are calculated using a transient heat transfer equation and include both external and internal frictional temperature increases. To calculate tyre wear, an abrasion equation is derived from experimental results. The free parameters are identified experimentally and the overall model is validated by overall tyre measurements. Subsequent simulations are used to analyse different landing and driving conditions with the aim of gaining a better understanding of temperature development and tyre wear in particular.