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一、引言 閘門水下振动时,由于周围流体的影响,自振頻率較真空中会有某些降低。这一現象,从力学效果来看,相当于閘門增加了一部分貭量,即由于流体而引起的附加貭量。增加后的閘門貭量,称之为虛貭量。1959年,阿勒尔斯瑪(E. Allersma)对潛沒水下的平面閘門的虛貭量进行了試驗研究,并給出了一些研究成果。笔者在研究某大型电站圓筒閘門的振动問題时,摸索到一套簡单而有效的測定虚貭量的方法,并用此方法得到了部分試驗成果。本文涉及的虛貭量的定义与古典流体动力学稍有不同。根据前人定义,虚貭量仅包含流体的慣
First, the introduction of underwater vibration gate, due to the impact of the surrounding fluid, the natural frequency of vacuum will be some decrease. This phenomenon, from the mechanical effect point of view, equivalent to the gate added a part of the amount of measurement, that is due to the fluid caused by additional measurement. Increase the amount of the gate after the gate, called the amount of virtual Qi. In 1959, E. Allersma conducted an experimental study of the imaginary quantities of a submarine-free planar gate and gave some research results. When studying the vibration problem of cylinder gate of a large power station, the author explored a simple and effective method to determine the amount of virtual vibration and got some experimental results by this method. The definition of virtual quantity involved in this paper is slightly different from classical fluid dynamics. According to the previous definition, the amount of virtual fluid contains only fluid habit