Research On LVDT Displacement Sensor For Aeroengine

With the rapid development of the aerospace industry,sensors have been widely used in the aerospace field.Among them,the LVDT(Linear Variable Differential Transformer)displacement sensor,which is a commonly used sensor for positioning the throttle lever and the needle in the aircraft engine,plays an important role in measuring displacement.However,so few are the researches on the application of LVDT in measuring internal displacement of aero-engines.This paper mainly conducts in-depth research on the LVDT used in a certain type of aero engine,using the electromagnetic simulation technology as the main method and introducing the orthogonal test analysis and gray correlation optimization decision to optimize the design of a certain type of LVDT sensor.And based on the platform built,it verifies that the optimized sensor meets the requirements of relevant technical indicators.First of all,this article elaborates the current research status,design methods and existing problems of LVDT research at home and abroad.After a detailed analysis of the basic principles,related performance indicators and measurement errors of LVDT,this paper designs a two-stage dual-redundant structure in compliance with the aeroengine application scenario and its specific technical index requirements for LVDT sensors.The waveform,amplitude and frequency range of the excitation signal are chosen,and a stepwise winding method is adopted.Secondly,in order to study the output characteristics of LVDT,this paper uses Ansoft Maxwell electromagnetic simulation software to perform electromagnetic analysis.It analyzes the output characteristics of single-and double-redundant LVDT and the cross-interference between two channels.A quantitative analysis is performed to examine the impact of various structural parameters on the linearity and sensitivity of LVDT output curve,mainly including the size of the core,the gap between the core and the skeleton,the thickness and position of the magnetically conductive ring,and the coil winding method.According to the actual working environment temperature requirements,this paper analyzes the temperature merits of LVDT.On the basis of the simulation analysis,this paper mainly optimizes simulation design technology and LVDT structure design in order to achieve the optimal design of dual-redundant LVDT.In regard to the repeated inefficiency in simulation modeling when the size is modified,the parameterized design is performed to optimize the simulation design technology.LVDT structure optimization design is employed to optimize the structural parameters combination,using Orthogonal test method.In order to find the optimal structural design,this paper furthers the efforts to conduct a gray correlation multi-objective decision-making optimization analysis for the structural parameter combination,realizing the optimal structural design of dual-redundant LVDT.Finally,this paper makes the physical design of the optimized dual-redundant LVDT,and designs a test system and verification platform for experimental verification.The results show that the dualredundant LVDT designed and manufactured in this paper meets the design index requirements of the application scenario and that the effectiveness of the grey correlation multi-objective decision-making optimization design method.