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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...
Characterizing nonlinear dynamic behaviors in the 3D near-surface wind field is a challenging problem of significant importance. The study of pollutant transport, wind power evaluation, forest damage assessment, among others, would benefit from this research. In this paper, we first use a high-resolution 3D ultrasonic anemometer to simultaneously measure three wind components. Then the multiscale...
Uncovering dynamics characteristics of 3D wind field is of great importance to understand the mechanisms of gas dispersal and provides useful clues for the optimization of gas source localization algorithms. In this paper, we first use a high precision 3D ultrasonic anemometer to collect the three orthogonal wind speed components and calculate corresponding instantaneous wind speed. Then we employ...
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,...
An improved single odor/gas source searching approach using a mobile robot by combining image recognition in complex environments is presented. First, color image segmentation of prospective visual candidates is achieved using support vector machines (SVM). Second, the features of those candidates, such as color, shape and orientation (the posture of the object) are extracted. Third, the robot finds...
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