Study On The Dynamic Characteristics Of Supporting Composite Construction For Power Station At Dam Toe

With the rapid increase of the reduced head and unit capacity of hydro turbine in recent years, more and more attention is paid to the vibration of units and mill construction. Abnormal vibrations of units and mill construction may cause the equipments in hydroplant inefficient, create fatigue in components of units, consequently, affect safe and stable operation of units, and the benefit of the hydroplant is also influenced. Meanwhile, the abnormal vibration and the huge noise may make the workers discomfort, long-term exposing to the vibration and noise can bring bad effect on body and mind of the workers. Therefore, careful study on the vibration that may appear should be made, and the measures to control and prevent vibrations need to be adopted. In this paper, aiming at Wanjiazhai hydropower station at dam toe, study on the dynamic characteristics of supporting composite construction and other relevant problems with three dimensional finite element method. The main results are as follows:Comparative study shows that the superstructure has obvious influence on the inherent vibration characteristics of supporting composite construction, and the frequency and the mode of vibration are both changed. Therefore, in accurate study, the superstructure should be considered. Point out the effects of considering hydraucone and auxiliary plant of tail water on the inherent vibration characteristics of supporting composite construction, and study the problem of choosing the range of the mechanical modal.Analyze the inherent vibration characteristics of the composite structure of floor and wind tunnel, which is the bottle neck of the supporting composite construction.Study the vibration source in hydroplant, and resonance checking is given to the supporting composite construction and the composite structure of floor and wind tunnel, then give the corresponding antivibration measures.Calculate dynamic response of the supporting composite construction in normal condition. The results show that the vertical displacement and the sum of horizontal and torsional displacement both meet the criterion.In this paper, first evaluate the effects of vibration in hydroplant on people using Meister curve. When evaluating, we should combine dynamic response value and frequency together. The results are consistent with the sense of workers in hydroplant. Valuating the noise in hydroplant with hygienic noise standard of industrial organization is just a reference. Appeal to establishing the standard about controlling noise in hydroplant soon, meanwhile, enhance controlling the noise in hydroplant in order to make the workers healthy.