Application of POD in calculation of heliostat's dynamic response to wind induction

There are usually several vibration modes participating in heliostat's response to wind induction. The complete quadratic combination (CQC) method can take the modes' coupling effect into account. The result is precise, however the computation work is heavy. Therefore, the proper orthogonal decomposing (POD) stochastic wind field was proposed to be applied in computation of heliostat's response to wind induction. The principle of POD was introduced, and the frequency range analysis on fluctuating response combining POD and CQC was discussed. Then POD was applied to decompose the time history of heliostat's surface wind pressure, synchronously collected by multi-channel electronic pressure scanning valve system in wind tunnel test, and the eigenvectors' distribution characteristics as well as each step's and mode's contribution were analysed. The root-mean-square of heliostat's displacement response was calculated. The response errors due to adopting mode reduction with different number of orders were compared. The result indicates that introducing POD to wind-induced response analysis can cut down much computation work while assuring adequate precision.