For steam power control of steam turbine, electro-hydraulic servo valve is a necessary component. However, the electro-hydraulic servo valve of steam turbine has a high requirement for the driving ability of the drive circuit, and the ordinary drive circuit cannot meet its requirements. Therefore, this paper designs a driving circuit with greater driving capacity for electro-hydraulic servo valve. The problem of insufficient carrying capacity of OP07 is solved by combining OP07 operational amplifier and push-pull circuit to improve its driving capacity. Taking 0-2.5V input voltage as an example, the optimized driving circuit is designed and simulated. The simulation results show that in the voltage mode, the drive circuit can drive the load with smaller resistance value and output larger current than the common electro-hydraulic servo valve drive circuit, which further improves the drive ability of the electro-hydraulic servo valve drive circuit.
KEYWORDS: Plastics, Deformation, Aluminum, Alloys, Finite element methods, Design and modelling, Analytical research, Failure analysis, Elasticity, Chemical elements
Finite element simulation model for cable brackets commonly used in commercial aircraft was developed to investigate the effect of the stamping depth and stiffeners distribution on the load-bearing capacity of 2A12 aluminum alloy brackets, as well as their failure locations. The results showed that: the stiffener can increase the bearing capacity of the bracket, the greater the stamping depth of the stiffeners, the greater the bearing capacity of the bracket; the stiffeners at both ends of the bending axis of the bracket increased the bearing capacity of the bracket the least, 9%. The stiffeners dividing the bracket bending axis into equal lengths increased the bearing capacity of the bracket the most, 30%. The junction of the horizontal plane of the bracket and the curved surface had the greatest equivalent plastic strain and was most vulnerable to plastic deformation.
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