Abstract
The contact stiffness of on the rough surface of tread interaction (tire-track) ,a significant parameter for the tire-track contact surface, gives rise to direct influences on stiffness and noises of tyres. There is no sufficient theoretical support for the wheel face design due to lack of research on this parameter. To solve this problem, an innovative method based on the fractal theory and the Hertz contact theory is proposed to estimate tread interaction contact stiffness. The fractal theory model is established to research the influencing factors on normal contact stiffness on the tread surface. Finite element analysis and physical tests have been conducted to make comparisons about the model. According to research results, there is a non-linear relationship between the contact stiffness and the fractal dimension. The research provides theoretical basis for tyre dynamics of straddle-type monorail vehicles and design of the track contact dynamics.
Highlights
With the development of big cities, traffic congestion caused by vehicles has become a negative factor that impacts people's quality of life [1].To reduce traffic congestion, urban monorail vehicles especially straddle monorail vehicles have gained the attention of many researchers
This article is organized as follows: In the first part, the rubber tread interaction normal stiffness model is established based on the fractal theory and the Hertz contact theory; In the second part, the influences on the normal contact stiffness of various factors of the system are comprehensively analyzed, including the shape of tire surface, the material of tyres and loads; Last but not least, experimental analysis is conducted with numerical simulation and physical experiments
In the finite software ABAQUS, the re-bar reinforcing bar units are adopted to simulate the wire cord fabric, and MooneyRivlin is adopted as the dynamic constitutive model of rubber materials [18]
Summary
With the development of big cities, traffic congestion caused by vehicles has become a negative factor that impacts people's quality of life [1].To reduce traffic congestion, urban monorail vehicles especially straddle monorail vehicles have gained the attention of many researchers. The research on the contact stiffness of the tread interaction roughness surface of straddle-type monorail vehicles plays theoretical and practical roles. There are two main research methods for contact stiffness of junction surfaces: the first one is the three-dimensional analogue simulation software and the second one is the parameter estimation based on the fractal theory. This article is organized as follows: In the first part, the rubber tread interaction normal stiffness model is established based on the fractal theory and the Hertz contact theory; In the second part, the influences on the normal contact stiffness of various factors of the system are comprehensively analyzed, including the shape of tire surface, the material of tyres and loads; Last but not least, experimental analysis is conducted with numerical simulation and physical experiments
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