The Design And Research Of Flow Valve Based On GMA

With the development of genetic engineering, new medicines, aerospace and other technology, studying on precise control of the amount of micro components were improved. While the traditional flow control technology can not meet the needs gradually, research on micro-fluid control technology was promoted and a lot of research results were obtained therefore. Using smart materials, a variety of fluid control devices have been developed. Since the characteristics of large strain, high precision and quick response, Giant Magnetostrictive Material (GMM) has certain advantages in the application. Based on giant magnetostrictive actuator (GMA) experimental platform in the laboratory, research on valve's structure design, performance analysis, modelling and controlling, etc, were carried out in the dissertation, which provides a basis for the valve's further development and research.Against the background of the emergence and development of flow valve, this paper summarized various smart materials'application status in the field of flow regulation, including smart gel, MR fluids, piezoelectric material and GMM. The application base, research status and issues source of ultra-magnetic flow control valve were emphatically elaborated, in order to provide the necessary foundation for following valve design, simulation and experiment.Micro-Flow valve's development and design include drive design, seal design and the overall structure design. However, current researches are focused on servo valve and on-off valve. According to actual needs, reverse-driven flow control method was proposed by combining the GMA and the spool.Based on this, sealing scheme, ball valve structure and overall connection scheme were designed, the sample was also processed. The experiments indicate that the valve has good sealing and regulation performance, quick response, meeting the experimental requirements.Micro-displacement amplification mechanism is the key component on connecting GMA and flow valve.In the paper, the characteristics of flexible hinge was studied. Stiffness calculation formula was derived, and a micro-displacement amplification mechanism with larger displacement output was designed.By means of finite element method, the static properties of mechanism were discussed. Both analysis and experiments show a certain effect of the reverse amplification, and can be used for flow control. Based on the understanding of flexible hinge, various forms of micro-gripper were designed and worked, which broadens the application field of GMA.Through theoretical analysis, a valve flow model with numerical simulation was established. By comparing the theoretical curves and simulation curves, related conclusions were get. Aimed at current problem, GMA output experiment, micro-displacement amplification mechanism experiment and flow test experiment were conducted. The BP neural network predictive control was considered, and the micro-adjustment effect of flow was verified.