Level and Hydraulic Resonance

To analyze this resonance, let us take the case of the vessel with a measuring chamber shown in Fig. 3.5, neglecting resistance to flow. If 

The period of hydraulic resonance varies with the distance between the bounded surfaces. 

Level in the measuring chamber, hi, is related to average level h by h - hi = hi  

Including this in Eq. (3.8) yields the response of measured level hi to 

But velocity ui is the rate of change of level, dhi/dt. Therefore a differential equation can be written eliminating m  

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