University of Twente Student Theses


Calculating the overpressure in a tyre cavity due to tyre movement and compression.

Reijmer, J.G.J. (2016) Calculating the overpressure in a tyre cavity due to tyre movement and compression.

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Abstract:When a tyre rolls over a cavity (tread patron of the tyre) an overpressure is created inside this cavity. When the tyre continues rolling, the cavity and the high pressure will be released. This will generate acoustic disturbance at the road/tyre interface. This disturbance passes into the air domain and creates noise. The objective of the assignment was to calculate the overpressure in the cavity due to tyre movement and compression. As well as accounting the amount of air pumping and noise generation due to the cavity release at the trailing edge of the tyre. Comparing this for different cavity dimensions and velocities, for a 2D and 3D situation. A 2D Ansys Fluent model was build matching a model found in literature. This model described a cavity being pressurized as in figure 1. After verifying this model, the model was expanded towards more realistic conditions. Boundary conditions and dimensions were adjust to our case. By varying the input parameters (cavity volume, cavity shape, opening length of the cavity and multiple cavities) the influence on the output parameters (amount of pressure build up inside the cavity, frequency of pressure wave and sound pressure level) was studied. With these results an overview was created which liked the effect of the input parameters to the output parameters. Also the case when the dimensions of the cavity was not fixed, but compressed, was studied. These results showed nonrealistic behavior. Thereafter the 2D model was converted towards a 3D model, but due to a lack of time, this model was not working properly.
Item Type:Internship Report (Master)
Apollo Tyres Global R&D B.V., India
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:Tyre, cavity, ansys fluent, compression, road
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