Electric servo system stiffness modeling method

Abstract

The invention belongs to the field of electric servo systems, and particularly relates to an electric steering system stiffness modeling method. The electric servo system stiffness modeling method comprises the following steps that firstly, a modeling base is set, wherein a control system of an electric steering system is established through Matlab / Simulink; secondly, a model connecting relation is built, wherein the model connecting relation is built according to the conditions of an object needing to be modeled, and modules called in the Matlab / Simulink are adopted by model prototypes. The electric servo system stiffness modeling method has the advantages that the method can be used for optimizing the parameters of the control system and improving the robustness of the system; the method can be used for guiding in optimization of the structural size of a transmission mechanism of an electric steering engine, so that the mass distribution of the electric steering engine is more reasonable; in the method, the principal factors influencing the electric servo system stiffness are demonstrated clearly, and the servo stiffness of the whole system is improved by optimizing the factors. The modeling method is high in precision and low in difficulty, and can be widely used in stiffness modeling of screw type electric steering engine systems.

Description

technical field [0001] The invention belongs to the field of electric servo systems, and in particular relates to a stiffness modeling method of an electric rudder system. Background technique [0002] The electric rudder system is composed of two parts, the steering gear amplifier and the electric steering gear. It is the main subsystem of the guidance control system, and its dynamic characteristics are directly related to the flight control quality of the missile. In the actual use of the electric rudder system, when the performance indicators such as rudder deflection angle, maximum rudder deflection angular velocity, frequency band, linearity and overshoot meet the requirements, some new problems will still appear. The main reasons for the existence of these problems are One is that the servo stiffness characteristics of the rudder system cannot meet the requirements. If the servo stiffness is low, it is easy to cause flutter on the rudder surface. When flutter occurs,...

AI Technical Summary

Problems solved by technology

In the actual use of the electric rudder system, when the performance indicators such as rudder deflection angle, maximum rudder deflection angular velocity, frequency band, linearity and overshoot meet the requirements, some new problems will still appear. The main reasons for the existence of these problems are One is that the servo stiffness characteristics of the rudder system cannot meet the requirements

If the servo stiffness is low, it is easy to cause flutter on the rudder surface

When flutter occurs, the aileron or rudder vibrates at a higher frequency with varying amplitude, which is extremely dangerous

[0003] If the servo system has low stiffness and large inertia, it will be difficult to obtain a high rotational speed, and at the same time, a large amount of loss of motion will be generated, which will increase the transmission error and affect the positioning accuracy of the system; Deformation, as well as the loss of motion caused by factors such as the dead zone of the control system and the operating error of the motor, cause the servo mechanism to lag or cause oscillation

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