Design Of Force Sensor Based On GMM Magnetic Theory And Research On Its Accuracy Guarantee Strategy

Intelligent systems are widely used in automatic control systems and high-precision detection systems because of their internal integrated sensors,drivers and other intelligent devices,which can sense environmental changes or play an active role.With the continuous development of modern manufacturing industry and precision science and technology,force sensing technology has been closely connected with human engineering production and industrial automation,and put forward higher requirements for the detection methods and means of traditional measuring devices.Giant magnetostrictive material(GMM)is a kind of functional material.It not only has excellent properties such as large output strain(or stress),high magnetic mechanical conversion coefficient,high energy density,fast response speed(microsecond level),high compressive strength and not easy to crack,but also has excellent mechanical properties.It can receive and respond quickly to static,quasi-static,periodic and impact load signals.Therefore,this paper studies the design of force sensor based on GMM magnetic theory and its accuracy guarantee strategy,develops a giant magnetostrictive force sensor with high linearity,fast response speed,and can detect periodic excitation and impact excitation.The static force measurement range of the sensor is 0～1400N,the sensitivity is 0.425 m V/N,the accuracy is ±1.43%,the response time is about 180 ms,the minimum resolution is 8.67 N,and the dynamic accuracy is ±2.02%.The research results are helpful to expand the further application of giant magnetostrictive devices in the field of force sensing,and lay a theoretical and technical foundation for providing high-performance force sensors in the field of industrial detection.The main contents of this paper are as follows:(1)Based on the theory of ferromagnetism,the positive and inverse magnetostriction effects of GMM are expounded,and the mathematical model of the micro energy change of GMM is established.Based on the principle of minimum energy,the extremum problem of GMM magnetization-related energy is solved,and the deflection and transition law of magnetic domain crystal direction under external factors such as magnetic field and mechanical compressive stress are studied.The positive and inverse effect mechanism of GMM magnetostrictive is revealed,which provides a theoretical basis for the design and characteristic analysis of force sensor.(2)Based on the magnetic theory of GMM,the structure optimization design was carried out from the aspects of bias coil,temperature compensation system and closed magnetic circuit,and a new structure of giant magnetostrictive force sensor was proposed.Based on the basic theory of finite element,the magnetic circuit simulation analysis of the designed force sensor model is carried out by COMSOL.The influence of different magnetic circuit structure and magnetic-mechanical coupling on the distribution of magnetic parameters in the force sensor is studied.The transfer coefficient between GMM and Hall element is determined,which provides a basis for the modeling and analysis of the output characteristics of the continuous force sensor.(3)The magnetic mechanical thermal multi field coupling dynamic model suitable for the force sensor is established,and an improved whale optimization algorithm with the idea of competitive particle swarm optimization is proposed.Through the numerical analysis method,the influence of the change of different parameters and external factors on the energy conversion of the sensor is studied,and the optimal working parameters of the sensor are obtained,which provides a theoretical basis for the accurate description of the output performance of the sensor and the subsequent improvement of accuracy.(4)A magnetic-mechanical-thermal multi-field coupling dynamic model is established for the force sensor,and an improved whale optimization algorithm is proposed by introducing the idea of competitive particle swarm particle update.Through numerical simulation analysis,the influence of different parameters and external factors on the energy conversion of the force sensor is studied,and the optimal working parameters of the force sensor are obtained,which provides a theoretical basis for the accurate description of the output performance of the sensor and the improvement of the subsequent accuracy.(5)The experimental test platform of force sensor is built,and the special linear programmable constant current source based on FPGA and the upper computer system of synchronous real-time data acquisition based on Lab VIEW graphical programming language are designed.The performance of the force sensor was verified,and the optimal working parameters of the sensor were determined and the static calibration was completed.On this basis,the comprehensive working performance of the sensor under dynamic excitation is tested,and the effectiveness of the proposed compensation strategy is verified.Figure [93] Table [12] 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