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A new type of piezoelectric transformer which is based on the stress distribution of the piezoelectric transformer to change the output voltage is presented. In this paper, we verified the feasibility of the principle of the new piezoelectric transformer from the simulation and experiment. The experiment results show a good consistent with the theoretical analysis. The designed piezoelectric transformer...
The applications of finite element method (FEM) to the analysis of bridge structures are introduced, and an analysis procedure for complex-shaped bridges based on FEM is proposed. The example bridge is a steel arch bridge with a total span of 201.96 m, which is going to be built in China. In order to study the spatial stress distribution of this bridge, a series of FEM analyses are conducted according...
Thermal load is a main load just inferior to water pressure. Thermal creep stress is an important stress reference data of hydropower engineering design, and it is the important design criterion of preventing cracking. Crack will appear if thermal creep stress is beyond the allowable thermal creep stress of corresponding age of concrete, which will affect the safety of dam. Xiaowan concrete arch dam??s...
Variety of board-fins are widely used in the industrial field, however, many problems such as technical complexity, fins falling, high rate of rejection, high cost and so on exist in the manufacturing methods available. In this paper, aiming at the problems existed in present methods, a new rolling technology used to shape board-fins was developed based on the traditional rolling principle. The forming...
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