Vibration reduction design method for constrained damping layer of hydraulic curved steel gate

Abstract

Provided is a hydraulic radial steel gate constrained damping layer vibration reduction design method. The method comprises the following steps that 1, finite element simulation unit selection is conducted on components of all parts of a radial steel gate, a curved panel adopts a shell unit to simulate the stress state, support arms, beams and longitudinal beams adopt a beam unit to simulate the stress state, hanger rods adopt a rod unit to simulate the stress state, and dynamical property analysis is conducted on the radial steel gate; 2, the equivalent mass of water is calculated by adopting a Westergaard method, and the dynamic property influence of water pressure on the radial steel gate is simulated; 3, structural mode strain energy analysis is conducted on the radial steel gate, it is obtained through analysis that the value of radial steel gate support arm mode strain energy is the maximum value, and by means of a constrained damping layer arranged on the support arm structure of the radial steel gate, a flow-induced load effect of the radial steel gate can be reduced. According to the hydraulic steel radial gate constrained damping layer vibration reduction design method, structural damping of the radial steel gate is increased, and a flow-induced load vibration effect is reduced.

Description

technical field [0001] The invention relates to a vibration reduction design method for a constrained damping layer of a hydraulic arc steel gate. Background technique [0002] The dynamic response of the gate flow-induced load is the product of the coupling between the flow-induced load and the dynamic characteristics of the gate. When the water flow form has been determined and the flow-induced load cannot be changed, adjusting the dynamic characteristics of the gate can effectively reduce the structural dynamic response, and increasing the structural damping is very important. One of the effective, simple and convenient means. [0003] Arc-shaped steel gates are widely used in hydraulic structures due to their light structure, reasonable mechanical performance and small opening and closing force. However, the problem of flow-induced vibration of arc-shaped steel gates is more prominent. Cause damage happens from time to time in hydraulic structures at home and abroad. T...

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Problems solved by technology

[0004] Looking at the destructive behavior of arc-shaped steel gates, most of them are due to the excessive vibration of the support arm, which causes the dynamic instability of the support arm or the load effect exceeds the material strength, and then the damage occurs

Tuned mass damping (TMD) vibration reduction is only effective for a certain order of resonance frequency. Because steel gates generally work underwater, the frequency is affected by water head and water depth, and the vibration reduction effect of solid tuned mass damping (TMD) is poor.

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