Research On Comprehensive Stiffness Measurement Technology Of Armature Component

The armature assembly is a key component in electro-hydraulic servo valves,and its stiffness characteristics are key indicators affecting the control performance of electro-hydraulic servo valves.In the existing electro-hydraulic servo valve manufacturing process,the stiffness characteristics of the armature assembly are indirectly ensured by ensuring the rigidity of the precision elastic components of the armature assembly,such as the spring tube and the feedback rod,however,due to the introduction of the assembly process,the stiffness characteristics of the armature assembly are still affected by many factors.This paper aims to develop a system for measuring the stiffness of the armature assembly and verify the stiffness characteristics of the press-fitted armature assembly.Firstly,based on the working principle of the electro-hydraulic servo valve,the equation of motion of the armature assembly is established,and the comprehensive stiffness of the torque motor and the stiffness of the armature assembly in the torque motor are solved.By analyzing the relationship between the stiffness of the armature assembly and the stiffness of the spring tube and the feedback rod under the analysis and measurement environment,and comparing with the comprehensive stiffness of the armature assembly in the torque motor,the measurement scheme of the overall stiffness of the armature assembly is determined.Through the finite element simulation analysis software,the influence of interference,friction coefficient and shape error on the overall stiffness of the armature assembly in the press-fit process is analyzed,and the theoretical calculations are compared with the simulation results.Secondly,according to the comprehensive stiffness measurement scheme of the armature assembly,the corresponding fixture,large angle force applying structure and pure force coupling mechanism are designed to simulate the actual working state and ensure the accuracy of the measurement results.In this paper,GB-STS static torque sensor is selected to collect force signals,and RGH24 Y grating system is used to collect displacement signals.By amplifying the collected signals and sending them to industrial computer for subsequent processing,the comprehensive stiffness value and measurement curve of armature components are obtained,and the measurement system is completed.Finally,the measurement accuracy of the measurement system is verified,and the authenticity of the system data collection is ensured through the sensor calibration test,and the effect of armature deformation on the measurement results is eliminated through the armature loading test.The measurement experiment of armature assembly is designed.The comprehensive stiffness of armature assembly is calculated by fitting the measurement curve with the measured data.The repeatability error of repeated measurement is within the allowable range.