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The Hydrostatic transmission (HST) converts the reciprocal power into continuous power as the device involved the ocean waver energy converter (OWEC). This paper suggests a simulation model for the hydrostatic transmission (HST). Simulation and experimental results are compared with each other. And the validity of the simulation model is verified. Though the suggested simulation model, basic study is performed for the circuit design of HST.
Extrusion process can minimize the loss of the material, fast and low cost. However, extrusion of aluminum alloys is a complex and difficult process because tearing tends to occur at the surface. Therefore, Finite Element Analysis is necessary to minimize trial and error. The purpose of this study is that finding of optimal extrusion die for fabricating of Automotive Oil Control Valve by Finite Element Method. In summary, the considering geometric die design is selected to reduce the stress concentration by DEFORM 3D simulation tool.
A magnetic levitation control system is built as a classroom demonstration device for systems and control courses. System linearization and PID controllers are used to control the unstable nolinear system.
Since the discovery of carbon nanotubes (CNTs), many interesting studies on composites with CNTs have been performed. However, it is extremely difficult to disperse CNTs in metal melts due to their poor wettability and large surface-to-volume ratio. The array of short fibers in a preform could be used to disperse the CNTs in the matrix. The use of hybrid reinforcement is required to solve the dispersion problems. Multi-wall carbon nanotube (MWCNTs)/Al2O3sf preform-based aluminum hybrid composites were studied. A high temperature compression test was performed to evaluate mechanical properties and workability. In addition, dispersion of the carbon fiber was investigated using a hardness test. The compressive strengths of hybrid metal matrix composites (MMCs) increased with increasing Al2O3 fraction. However, the compressive strengths were not necessarily proportional to the CNT fraction. Excessive CNTs adversely affected the material due to agglomeration or poor wettability with the matrix.
Many researchers have studied for improving the control performance of electric hydrostatic actuator(EHA), but studies are limited to improve the characteristics of transient response such as a step response. In this study, ISF-FF-PI-D controller is proposed for the position control of EHA in the high frequency range. First, FF-PI-D control system is designed for compensation of disturbance input and improvement of target tracking performance. In addition, input shaping filter(ISF) is applied to prevent saturation of electric motor using FF-PI-D control system in the high frequency field. As the result, it is confirmed experimentally that target tracking performance of ISF-FF-PI-D control system is better than FF-PI-D control system in the high frequency range.
Carbon Fiber Reinforcement Plastics (CFRP) has been used as aerospace parts by vacuum forming or compression Recently, CFRP products have been increased the competitiveness with mass production of CFRP system. Also, hybrid composite is needed to improve the CFRP weakness such as low elongation. In this study, CFRP and SUS304 material is combined by hot press mold with temperature variable or loading time. As a result, optimal loading pressure and loading time is 0.4㎫, 5 minutes respectively. Especially, CFRP-SUS304 hybrid composites, which made by hot press molding, have a good interface states with each other.