| Precision positioning technology is the important symbol of the national manufacturing level,which is one of the key technology in precision drive,precision measurement and precision machining.Precision positioning technology has be widely using in integrated circuit manufacturing,ultra-precision processing,data storage technology,biological engineering,and other fields.Along with the rapid development of science and technology of our country,sophisticated equipment puts forward higher challenge on the precision of the positioning,especially in aerospace,precision machining,biomedical,and micro manipulating robot etc,the positioning precision of traditional have been unable to meet the requirements of these technical areas,therefore,using the theory of modern precision drive designed a large travel and high performance,high reliability,fast positioning positioning platform becomes the key to the technology breakthrough.Bsed on the virtues of GMM,such as large magnetostrictive strain,high energy density,fast response speed,big output power,large magnetic machine coupling coefficient,high Curie temperature and the ability to realize the reversible conversion between electromagnetic energy and mechanical energy.This paper design a micro positioning precision drive,and drive source,design of precision positioning platform.The main work and conclusions are as follows:1.According to the principle of minimum value of free energy,the magnetostrictive mechanism of supermagnetostrictive material is described.Based on the characteristics of GMM,the respectively magnetic field structure,prestressed mechanism and temperature control system of GMA were designed,and on this basis,combining with the practical processing technology,design the overall structure of GMA,on the basis of the existing of GMM rod geometry size to determine the GMA geometric size of each part.2.With the help of the elastic deformation of flexible hinge unit material stress produced with high motion resolution,no friction,no lubrication,simple manufacturing process and the unique advantages,based on the theory of mechanics and material mechanics theory to establish the statics model of straight circular flexure hinge mechanism,The flexible hinge geometrical parameters and flexible hinge platform theoretical mathematical model of the relationship between the output displacement are acquired.the optimal design parameters of the flexible hinge positioning platform are obtained by using Matlab numerical simulation software.They are minimum thickness t = 0.8 mm,cutting round radius R = 2.5 mm,height h =10 mm and work platform width of 60 mm.the design of flexible hinge positioning simulation platform structure are verified by finite element method,the results show that the theoretical analysis and simulation results of the maximum error is only 3.06%,which verifies the correctness of the theory of statics analysis,and provides a theoretical basis for the structure optimization design of flexure hinge positioning platform.By finite element method for the design of flexible hinge positioning platform for modal analysis,the results show that the theoretical analysis and simulation results of the maximum error is only 0.8%,which verifies the correctness of the theory of dynamics analysis.3.Introduces five kinds of nonlinear hysteresis model that the domestic and foreign scholars have been establishing on GMM hysteresis nonlinearity.They are preisach model,neural network model,created Duhem model,J-A model and model of free energy.Based on this,select the Preisach Preisach model,through to the Preisach model discretization,created the GMA numerical model hysteresis characteristics.According to the design of GMA size,solving the magnetic field model(Id?H),the hysteresis expansion model(??M),and determine the displacement output model of GMA.The performance test shows:The maximum error of the experimental results and theoretical calculation of the magnetic field intensity H is 2.43kA/m;The maximum error of the experimental result and theoretical calculation of the bias coil is 1.74kA/m,which verifies the correctness of the proposed magnetic field strength formula.With the gradual increase of the offset current,the maximum travel size of the GMA in the same current is smaller,which is consistent with the hysteresis loop of the GMM.As the bias current increases,the offset magnetic field increases,and the return error of the GMA decreases.The design of the GMA is the best when the bigoted current is 0.6A,which verifies the correctness of the design theory of the GMA.Displacement test platform coincided basically with the results of the experiment results and the model calculation,prove that the model can better reflect the actual situation of GMA output displacement,the correctness of the Preisach model are validated. |
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