Effects of different poses and wind speeds on wind-induced vibration characteristics of a dish solar concentrator system

摘要

In order to investigate the anti-vibration characteristics of a dish solar concentrator (DSC) system with wind-induced vibration, based on fluid-solid interaction method, a simulation model of a DSC system is developed and verified by experimental modal analysis method, and the anti-vibration characteristics (including natural frequency, mode shape and maximum deformation, moment and force) of the DSC system with wind-induced vibration are investigated and the useful results are concluded and obtained. Actually, the wind loads will cause a decrease in its lower-order natural frequencies of the DSC system, but the moment and force of the DSC system will be increased due to the wind loads increase under the same azimuth and pitching angle. When natural frequency at different wind speeds mainly concentrated in the range of 0.8396-4.135 Hz, no resonance can be caused by wind-induced vibration, but the maximum deformation of the mode shape for the DSC system is 2.5055 mm so that the local stiffness should be checked in the design process. Moreover, the percentage that the maximum stress of DSC system is less than the yield limit of carbon steel (Q345) is 4.03%, and the DSC system is of good safety during its normal working condition. The obtained results is useful for enhancing the anti-vibration performance of the DSC system. (c) 2020 Elsevier Ltd. All rights reserved.