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太阳跟踪器推杆产生的冲击载荷会引起结构振动,由振动变形导致的跟踪偏差对系统的发电效率影响十分显著。作者采用ANSYS软件对20 k W级双轴太阳跟踪器进行结构动力学分析,讨论了太阳跟踪器前6阶的模态参数,并计算了太阳跟踪器在冲击载荷作用下的振动响应特性。研究结果表明:太阳跟踪器的固有频率随高度角的变化不明显,第2阶、第5阶振型对结构的振动变形影响较大;在冲击载荷作用下,结构的最大振动位移为26 mm,对应的偏差角为0.33°,小于控制要求的0.5°,结构振动对跟踪器的发电效率影响较小。
The impact load generated by the sun tracker putter can cause structural vibration. The tracking deviation caused by vibration deformation has a significant impact on the power generation efficiency of the system. The authors used ANSYS software to analyze the structural dynamics of a 20 kw class biaxial solar tracker. The modal parameters of the first six stages of the solar tracker were discussed and the vibration response characteristics of the solar tracker under the impact load were calculated. The results show that the natural frequency of the solar tracker does not change obviously with the height angle, and the vibration modes of the second order and the fifth order have a great influence on the vibration and deformation of the structure. Under the impact loading, the maximum vibration displacement of the structure is 26 mm , The corresponding deviation angle is 0.33 °, which is less than the control requirement of 0.5 °. The structural vibration has little effect on the power generation efficiency of the tracker.