Research On Static And Dynamic Analysis And Structural Optimization Of Radial Gate In Jiudianxia Project

Eccentric-hinge radial gate is a new type gate mainly using for high water head. Due to the high technical difficulties and lacking of available analytical data, designers had encountered many difficulties when doing structural design and analytical calculation for this kind of gate. The principal method for gate design is to simplify all the components into plane members, and then apply structural mechanics method to calculate them. However, this method can not reflect the operating performance in integral space of gate. Based on the great common software ANSYS and the key problems of eccentric-hinge radial gate involved in the Jiudianxia Project, this paper analyzed the characteristics under stress and operation mode of eccentric-hinge radial gate, then established simulation model of three-dimensional thin walled structure, and carried out static analysis and dynamic analysis as well as optimum design. The main contents are as following:1.The unit mode of ANSYS had been researched and selected which can show the true operating performance of every component of the gate . In accordance with the characteristics under stress and operation mode of eccentric-hinge radial gate, a 3D finite element model of thin walled structure of the gate was put forward.2.The basic theoretical equation of dynamic finite elements was introduced. According to the interaction principle of structure and water dynamic force, the calculating equation of coupling effect between the water body and gate was established, and secondary development technique was also researched. The calculating equation of added mass program by hydrodynamic pressure had been developed based on APDL of ANSYS.3.In accordance with the work characteristics of eccentric-hinge radial gate in Jiudianxia Project and utilizing the modeling method of radial gate introduced in this paper, the fine finite element model of radial gate in Jiudianxia Project had been established, and simulating calculation of the static and dynamic analysis had also been carried out. The stress and strain evolution ruler of structure in different operating conditions with different loads as well as the vibration characteristics at different opening and water level had been analyzed. The strength and rigidity of radial gate had been calibrated and some helpful suggestions had been put forward.4.Due to the present study status of flow-induced vibration control in radial gate and utilizing the random vibration theory in ANSYS, the flow fluctuation pressureacting on radial gate had been simulated, and the reaction analysis of flow-induced vibration had been carried out.5.On the basis of ANSYS, the calculating methods using the genetic algorithm into the structural optimization of the gate bodily form was put forward and corresponding procedures as well as example verification was also carried out. Finally, this optimization method was applying into the radial gate in Jiudianxia Project to optimize the geometrical dimensions of main components. The computing results showed that the strength and rigidity after optimization conform to the requirements of specification and the general rules, and the research findings had some reference value to further research.