请教number of alteration嘛意思? 根据" on the other hand, an excitation force due to that the blade is excited at a frequency equal to one of the natural frequencies of the blade during the steady-state, shut-down, or start-up stage of the fan. " 还有相关法规中提到“start-up and shut-down tests above rated wind speed” 觉得是指风机转速吧查看更多
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