Three Dimensional Finite Element Analysis Of Radial Steel Gate

The content studied in this thesis is an important part of an engineering-the safety appraisal of the strobe in La Lang Power Plant The strobe was designed, installed and place in operation in the beginning of the 70s last century. Limited by the calculating instrument and theory, the design was based on the 2-D system method. The main fault in this design is the ignorance of the entity integration and the dimensional property of the radial gate itself, which influence the accuracy of design and calculation. In order to ensure the safety and dependability of the strobe's operating, a 3-D finite element model is built after on-the-spot measurement of the flood gate. The model has more approximation to the actual structure. Based on the technique, the stress and deformation calculation, modal analysis and dynamic responds calculation are developed in this thesis.The structure of the gate has serious welding fault and rust accumulated day by day. That is why the FEA calculated value is smaller than the measured value. Yet the distributing regularity are fundamentally same as each other, which validated the rationality of the model.Having compared the calculated value with which the strobe's gravity is concerned to that with gravity unconcerned, the influence regularity of gravity to the strength and stiffness of each component is found outFollowing the modal analysis and dynamic responds calculation on the strobe model, the natural property and dynamic respond regularity of the strobe are provided. This thesis can provide reference in theory for reducing vibration and running safety of the strobe.Based on the integration calculation results, a new method named shell-to-solid submodel is put to use in this thesis, which means a submodel (child solid) is extracted from entire model (parent solid) to analyse the influence of welding fault to the component intensity. The analysis outcome indicates that the shell-to-solid submodeling is basically feasible for this task. So, a new way is brought forward for the analysis of the welding influence on constructions.