Numerical Simulation Of Force-to-electricity Conversion Performance Of Flexible Magnetoelectric Materials Based On ANSYS Maxwell

Flexible sensors and flexible electronics theories are widely applied to information interaction,physical sign monitoring,soft robot,weak signal control and other fields.In these fields,piezoelectric sensor is a very typical flexible sensor,which has widely application and complete technology.However,with the development of science and technology in the modern society,the demands for complex scenarios are increasing,and the requirements for flexible sensors are also higher and higher.The traditional flexible sensors are difficult to operate in passive conditions or complex condition on account of the need for external power supply,which also makes it an urgent problem to find a new type of self-powered flexible sensor.Based on the electromagnetic field theory,a new type of self-powered flexible sensor is developed,and its electromagnetic performance is analyzed by means of numerical simulation.Through the combination of theory and practice,the new type of self-powered flexible sensor is applied to the real scenarios to analyze electromagnetic performance.The main work of this thesis is listed as follows(1)Starting from a simple ideal model,based mainly on the electromagnetic system(permanent magnet / polymer)and conductive system(copper coils),designing and realizing a self-powered flexible sensor model through ANSYS Maxwell software.Then,the electromagnetic performance is analyzed to verify its working mechanism under compression/ tension state.It was found that the magnetic flux of copper coils changes significantly due to the stress in the model,and the induced electromotive force is generated in the coil.At the same time,the factors that may affect the electromagnetic performance of the self-powered flexible sensor are analyzed theoretically.Secondly,replacing copper coils with liquid metal to improve the expansibility of self-powered flexible sensor,and the performance of the self-powered flexible sensor is improved by means of increasing the amounts of permanent magnets.Finally,from the perspective of natural bionics,the self-powered flexible sensor is well integrated into the complex scenarios to improve its adaptability in complex conditions.(2)In order to improve the sensitivity and expansibility of the self-powered flexible sensor system,the way of breaking the permanent magnet into magnetic powder is introduced to reduce the Young's modulus,which makes it show better electromagnetic performance in different scenarios.Considering the complexity of magnetic particle system,which is a great challenge for simulation.Firstly,based on ANSYS Maxwwell software and the basic theory of electromagnetic field,the equivalent model equation of binary composite system is derived,and the accuracy and applicability of the equivalent equation are verified from multiple dimensions.Secondly,based on the derived equivalent equation,a series of flexible sensors based on electromagnetic system(magnetic particle / polymer)and conductive system(copper coil)are analyzed,which can be applied to fiber fabrics,human vital signs monitoring,soft robot signal detection and other fields.Finally,the electromagnetic performance of different self-powered flexible sensors is deeply analyzed by adjusting multiple variables,such as turns of coil,radius of coil and mass ratio of magnetic powder to polymer,and corresponding optimization schemes is carried out.