Abstract
In order to realize the hardware-in-the-loop (HIL) experiments of a certain type of electric linear actuator in the laboratory, an electric linear load simulator (ELLS) based on LabVIEW+PXI platform was developed to simulate the external force of the actuator under actual working conditions. In structural design, the ball screw is used to convert the PMSM torque into linear force. In hardware design, the system is built using the upper-lower computer system architecture based on PXI bus. In software design, the program is written in LabVIEW, which mainly includes the data processing and display program in the upper computer and the data acquisition program, the loading motor control program and the actuator control program in the lower computer (PXI), in order to ensure the loading accuracy of ELLS, control methods such as force closed-loop PID controller, position feedforward compensation and input feedforward compensation are also introduced in the loading motor program. Finally, the ELLS was built and the signal tracking tests were carried out. The experimental results shows that the loading accuracy can reach 93.5% and 90.3% when ELLS tracks 1000N-2 Hz and 1000N-5 Hz respectively, which proved that the accuracy of ELLS satisfies the “Double Ten Index”.
Highlights
The electric linear actuator is mainly used for the adjustment of the position of missile launcher, the adjustment of the opening of solenoid valve, and the precise control of spacecraft rendezvous and docking [1]
Wang et al [2] designed a displacement detection system for industrial controller based on PXI platform; Li et al [3] designed a four channel measurement and control system based on LabVIEW and PXI platform, which can achieve loading test on four-channel actuators at the same time; Wang et al [4] developed an electric torque loading system based on virtual instrument technology, which can realize the loading test of four-channel actuators
4.2.2 Input feedforward compensation In order to realize the adaptive adjustment of the force command signal according to the error signal, The force command feedforward compensation is introduced to improve the loading accuracy of the system
Summary
The electric linear actuator is mainly used for the adjustment of the position of missile launcher, the adjustment of the opening of solenoid valve, and the precise control of spacecraft rendezvous and docking [1]. Electric Linear Load Simulator (ELLS) is a complex electromechanical system with linear force as the output object It is an important equipment in lots of hardwarein-the-loop (HIL) experiments. In order to realize the hardware-in-the-loop (HIL) experiments of a certain type of electric linear actuator in the laboratory, an ELLS based on LabVIEW and PXI chassis was developed. The computer with LabVIEW is used as the upper computer, and the PXI chassis is used as the lower computer, which is mainly used for realtime data acquisition and processing Control methods such as the position feedforward compensation, the input feedforward compensation and the force closed-loop PID control are adopted, thereby improved the loading precision and dynamic performance of ELLS
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