Double TMD vibration damping method for reducing the hydraulic gate accompanying vibration induced by high dam flood discharge

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 1-8.

LIANG Chao1,2,LIAN Jijian3，ZHANG Jinliang1

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Abstract

The gate vibration induced by high dam flood discharge is a classical problem in the field of engineering hydraulics.Recently, it is reported the gate accompanying vibration that is characterized by concentrated energy and stable dominant frequency has been observed in prototype tests.It is noted that the aforementioned characteristics of gate accompanying vibrations are significantly beneficial for the application of passive dynamic vibration absorber (DVA).As the fluid-solid interaction mechanism is extremely complex, not only the vibration with dominant frequency but also the vibration in a relatively wide frequency band should be attenuated to avoid the generation of strong vibrations induced by other mechanisms while reducing the accompanying vibration.Therefore, considering the special mechanism of gate accompanying vibration, the double tuned mass damper (TMD) was applied and the vibration equation was established.According to the H∞ robust control design target, the objective function and constraint conditions for the gate-double TMD system were deduced.Moreover, the parameter optimization design was conducted based on a simplified model with similar dynamic characteristics as the actual model.The dynamic responses of the actual gate model with and without the double TMD were analyzed and the results show that the proposed approach can effectively reduce the gate accompanying vibration and ensure the safety and normal operation of the hydraulic gate.

Key words

high dam flood discharge / accompanying vibration of gate / vibration reduction method / H&infin / performance objective / double TMD / parameter optimization design

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LIANG Chao1,2,LIAN Jijian3，ZHANG Jinliang1. Double TMD vibration damping method for reducing the hydraulic gate accompanying vibration induced by high dam flood discharge[J]. Journal of Vibration and Shock, 2019, 38(18): 1-8

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