| Key technology of intelligent tire is one of research hotspots for tires and its research fields involve in cord-rubber composite, tire mechanics, sensing technology, experiment technology and so on. This dissertation is devoted to the theory model and test technology of cords for tires. A mathematic model is derived based on the theory of composite mechanics to calculate the cord tension; cord tension sensors are designed and embedded into tire, which is produced and used in experiment research. This dissertation opens up a new way for research of intelligent tire.The research firstly begins with bring forward a physical stiffness-circle-spring model of tires base on the characteristics of tire structure. A mathematic model of cord tension of any lamina in circular beam is built up based on the theory of composite plates and shells. A mathematic model of cord tension of any lamina is built up by calculating the stiffness model under inflation and static loading case of tire also. Two mathematic models indicate that cord tension is relating with loading and shape size of tire, specification of cord, lay angel, space, belt shape size and all coupling action. For checking out the result of theory analysis, FEA calculations are carried out in the cases of inflation, static loading of the tire and the results of FEA are evaluated. The results of cord tension calculated under different loads are discussed.Cord tension sensors are designed and they can be embedded in tire at manufacture procedure without damage. Systematic experimental study on the tension properties of the steel cord and the tension properties of the steel cord in composite is carried out. Then testing mechanic of cord tension in tire is brought forward. PVDF-rubber sensors are designed also which be used in measure the surface stress of tire. The cord tension sensors embedded in tire and checked out after vulcanization is the sign as the success of sensor design.Rationality and feasibility of the theoretical model is proved by the results of experiment and calculation, and achieved the relation formula of cord tension with structure of tire and case. According the dynamics experiment of tire, it has great advantage for monitoring tire by cord tension and strain of tire surface.When structure and material of tire are certain, changes of cord tension and internal-surface strain for tires are associated with the cases of tire. It can be analyzed the cases of tires by monitoring the changes of cord tension and strain. This result has great meaning for design testing system of cord tension or strain for tire and monitoring system for intelligent tires. |
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