ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A Captive Trajectory System Using Double Closed-loop Velocity Control
Received date: 2013-07-22
Revised date: 2013-10-12
Online published: 2013-11-11
Supported by
National Natural Science Foundation of China (51075385)
The captive trajectory simulation (CTS) system can be operated in two modes, the position control mode and the velocity control mode. Position control mode with closed-loop is employed in existing CTS systems of high-speed wind tunnels. Its disadvantages are low efficiency and possible off-trajectory collisions caused by positioning the store model using a "move and pause" technique. Therefore, a velocity control strategy with a double closed-loop is investigated in this paper by establishing an error control loop for the forces and moments caused by the airflow on the store model. The velocity control strategy allows the store model to move continuously along the trajectory, dynamically generating the proper velocity scaling and always positioning the store using velocity control commands while a trajectory is being generated thus finally realizing the velocity control of the CTS. Simulation experiments and wind tunnel tests show that the principle is correct, its trajectories compare favorably with those obtained by the position control mode, while the productivity is increased by about 50%. A greater number of points on the trajectory can be obtained, and the off-trajectory collisions are eliminated. Therefore the double closed-loop strategy is satisfactory and has broad application prospects.
ZHOU Run , HUANG Xuhui , ZHANG Zhengyu , LI Ping . A Captive Trajectory System Using Double Closed-loop Velocity Control[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1522 -1529 . DOI: 10.7527/S1000-6893.2013.0432
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