Aircraft steering engine load simulator based on electro-hydraulic digital valve

Abstract

The invention discloses an aircraft steering engine load simulator based on an electro-hydraulic digital valve. The aircraft steering engine load simulator comprises a controller, an electro-hydraulicdigital valve, a hydraulic cylinder, a force sensor, a rubber metal buffer spring and a position sensor, the aircraft steering engine load simulator has the advantages that direct digital signal control can be achieved, an electro-hydraulic digital control mode is adopted, an electro-hydraulic digital valve is arranged to serve as a control element of the load simulator, and the digital-to-analogconversion link is eliminated in principle; hysteresis, zero offset and quantization error are not generated; the permanent magnet synchronous motor is used as a core element of a driver in the electro-hydraulic digital valve, and an electric signal is converted into a motor rotation angle to be output, so that the hydraulic valve can receive a continuous input signal, namely, the error of the traditional stepping motor caused by on-off state conversion is eliminated; the loading precision and the tracking performance are good; and the control performance of the aircraft steering engine loadsimulator can be improved due to the accurate control of the electro-hydraulic digital valve serving as a control element on an execution element.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control system design and simulation, in particular to an aircraft steering gear load simulator based on an electro-hydraulic digital valve. Background technique [0002] The aircraft steering gear load simulator is not only a special equipment for laboratory steering gear testing, but also an important part of the new generation of flight control ground simulation system. With the continuous development of civil aviation in my country, higher standards and requirements are put forward for the working performance of the aircraft rudder load simulator. [0003] The traditional aircraft steering gear load simulator is mainly composed of electro-hydraulic servo valves, hydraulic cylinders, sensors, buffer springs and steering gears. Therefore, the key to improving control performance is to improve the performance of the electro-hydraulic control valve as a control element. At present, the control ...

AI Technical Summary

Problems solved by technology

At present, the control valves used in aircraft rudder load simulators are mostly servo valves, proportional valves, etc. On the one hand, they can only accept analog signal control, and multiple times / analog conversions in the process of signal reception and transmission will cause errors in the system and keep zooming in

On the other hand, there are hysteresis and zero bias phenomena in the electromechanical system, resulting in serious nonlinearity between the spool and the control signal

Although the existing high-speed switching valves and 2D digital servo valves use the direct drive technology of the spool, the spool will switch between on and off states after receiving the pulse signal from the driver, and the input is a discrete signal, which will lead to certain quantization. Error, thereby reducing the control accuracy of the control valve, which seriously affects the control performance and tracking accuracy of the aircraft steering gear load simulator

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