Study on shadow compensation method for three-dimensional ultrasonic anemometer
Three-dimensional anemometer plays important roles in many fields,but the structure of three-dimensional ultrasonic anemometers itself affects the wind field to be measured,which leads to shadow effect,resulting in measurement errors.Most of existing shadow compensation methods are optimized from array structure of the anemometers or limited to two-dimensional wind speed and direction,and the effect is poor when the methods are applied to three-dimensional wind measurement.Aiming at this problem,a shadow compensation method for three-dimensional ultrasonic anemometers is established by using random forest regression algorithm.The wind speed and wind direction data affected by shadow effect are obtained by finite element simulation.The model are trained and tested by taking the data as sample.Results show that the proposed shadow compensation method reduces the relative error of wind speed and theoretical value within±0.1%,reduces the average relative error of vertical wind angle from-4.1%to 0.08%,and reduces the average relative error of horizontal wind angle from 1.9%to-0.8%.It verifies the feasibility of the proposed method in solving the shadow effect problem.
three-dimensional anemometershadow compensation methodrandom forest regression algorithmfinite element analysis
万方数据
维普
