Dynamics Modeling And Performance Characterization Of Giant Magnetostrictive Pump

With the development of microfluidic devices and MEMS technology,the research on micropumps which is drived by the intelligent materials,especially giant magnetostrictive materials(GMM),has become a hot research topic in domestic and overseas.With its small size,light weight,precise control of the flow and superior performance,giant magnetostrictive pumps(GMP)can be fully able to meet the high demand for intelligent micro-pump in modern industry.Based on the excellent characteristics of the giant magnetostrictive material,the overall structure design and simulation analysis of the giant magnetostrictive pump are systematically studied in this thesis.And here are provide a kind of design theory supporting for designing a new intelligent micro-pump which is smaller,precise and controllable,from the aspects of dynamic modeling,flow resistance characteristic analysis and bubble influence mechanism.Based on the research background of Giant Magnetostrictive Materials and the research status of Giant Magnetostrictive Pumps,the main contents of this thesis is described as follows:(1)According to the working principle of the giant magnetostrictive pump,here we put forward the design requirements of the giant magnetostrictive pump,and carry out the general structure design of the giant magnetostrictive pump,including the selection and size calculation of the GMM rod,the driving coil structure parameter design,pre-pressure system and cooling system design,pump height design,cantilever check valve design,seal and other key parts of the structural design;(2)According to the structure and working principle of the giant magnetostrictive pump,the dynamic model is established and the step response analysis is carried out by MATLAB software,and the influence rule between the output flow and equivalent mass,equivalent stiffness,equivalent damping,drive frequency and are also obtained.Then we established the dynamic model of the cantilever check valve,and analyzed the fluid-solid coupling characteristics of the cantilever check valve by COMSOL software.The influence of the material and thickness of the valve plate on the characteristics of the valve are also studied.(3)Based on the three basic equations of hydrodynamics,the flow resistance characteristics of the giant magnetostrictive pump are analyzed,and the hydraulic loss of the giant magnetostrictive pump are calculated.And the key factors influencing the flow resistance are obtained under the action of viscous medium.Then,the COMSOL software was used to analyze the influence of pump cavity height,inlet and outlet pipe position and its size and chamfer shape on the fluid velocity and pressure in the pump cavity.(4)Based on the mechanism of the bubble generation and the influence of the bubble on the equivalent volume modulus of the fluid,the affection process of the bubble in the pump chamber on the pump output flow rate,the output pressure,the working frequency and the motion of the cantilever valve are analyzed.Here we proposed a method to reduce the bubble from inhibiting the bubbles’ generation and increasing the bubbles’ circulation,we provides a way of designing a giant magnetostrictive pump with anti-bubble ability.