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A novel low-cost 2-D wind velocity (speed and direction) sensor was designed based on the principles of statics and optics. A vertically suspended optical fiber was employed in the designed sensor as the sensitive element, which could be deflected by the applied force of airflow in 2-D horizontal planes. An optical signal emitted from the end of the fiber was projected onto a charge coupled device...
Wind estimation is quite important for the control and applications of quadrotors. On the basis of the freestream-velocity estimation method using inclination-angle measurement, this paper proposes a correction method considering the acceleration's influence on the quadrotor. Both the original and correction methods use the data that totally come from the inertial measurement units (IMUs) of the quadrotor...
This paper presents a multiple-fan wind tunnel based on active control technology. The wind tunnel has 6 swivel plates which can rotate in −90°∼+90° at the entrance. Each swivel plate consists of 8 fans. The wind field in the wind tunnel can be changed by controlling the fan speeds and the angles of swivel plates. We use a master-slave control structure, instead of the previously used lumped structure,...
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