Aiming at the problem of high AC control difficulty, an AC coupled vector controllable suspension force scheme is proposed, the two-phase coupling is solved, analyzed and calculated, and the T-type decoupling equivalent is carried out, and the physical resonance complete decoupling method is proposed. The calculation and simulation results show that the AC maglev can meet the amplitude and phase conditions at the same time, and the DC equivalent controllable suspension force can be generated and realized. The DC control method can be used to reduce the difficulty of AC control, which provides a new structure reference for AC maglev.
According to the requirement of electric upsetting process design for 30MnSi prestressed concrete steel rod (PC steel rod), a set of electric field-temperature field-structure field simulation system was established on deform platform combined with practical production experience. Using this system, the upsetting process of PC steel rod under different technological parameters was simulated, and the forming rule and surface shape of the upsetting head under different technological schemes were analyzed. The forming shape of the upsetting head was taken as the response parameter. Box-Behnken design-response surface method was used to optimize and verify the three main parameters of upsetting temperature, upsetting speed and clamping distance, which can affect the forming quality of the header. The simulation results met the requirements of enterprises on the performance of the prefabricated parts.
KEYWORDS: Deformation, Finite element methods, Engineering, Data modeling, Analytical research, Plastics, Mechanical engineering, Standards development
Taking the ejector rod of a series of long bolts on cold heading process as the research object, the force of ejector rod is simulated and analyzed by DEFORM-3D software in order to solve the problem of ejector rod fracture encountered with actual production. The buckling of ejector rod is analyzed by Workbench software, and the relationship between the stress of M6 outer hexagon longs bolt ejector rod with different length-diameter ratios of cold heading and the critical stress of destabilization is analyzed. The critical length-diameter ratio of the ejector rod to break with unprotected condition is obtained, which agrees with the production experience of an enterprise. The finite element analysis technology provides theoretical basis of the production of long bolts and provides standard for the design of cold heading ejection mechanism.
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