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Modal Analysis of a Steel Radial Gate Exposed to Different Water Levels

Brusewicz K., Sterpejkowicz-Wersocki W., Jankowski R.

Archives of Hydro-Engineering and Environmental Mechanics

2017

Vol. 64, nr 1

37--47

With the increase in water retention needs and planned river regulation, it might be important to investigate the dynamic resistance of vulnerable elements of hydroelectric power plants, including steelwater locks. The most frequent dynamic loads affecting hydroengineering structures in Poland include vibrations caused by heavy road and railway traffic, piling works and mining tremors. More destructive dynamic loads, including earthquakes, may also occur in our country, although their incidence is relatively low. However, given the unpredictable nature of such events, as well as serious consequences they might cause, the study of the seismic resistance of the steel water gate, as one of the most vulnerable elements of a hydroelectric power plant, seems to be important. In this study, a steel radial gate has been analyzed. As far as water gates are concerned, it is among the most popular solutions because of its relatively small weight, compared to plain gates. A modal analysis of the steel radial gate was conducted with the use of the FEM in the ABAQUS software. All structural members were modelled using shell elements with detailed geometry representing a real structure.Water was modelled as an added mass affecting the structure. Different water levels were used to determine the most vulnerable state of the working steel water gate. The results of the modal analysis allowed us to compare the frequencies and their eigenmodes in response to different loads, which is one of the first steps in researching the dynamic properties of steel water gates and their behaviour during extreme dynamic loads, including earthquakes.

System sterowania zamknięcia segmentowego z przeciwwagą na stopniu wodnym Łapino na rzece Raduni

Mackiewicz S., Szudek W., Skierka A.

Gospodarka Wodna

2002

Nr 12

516-520

Kaskada rzeki Raduni jest cennym zabytkiem budownictwa wodnego. Mamy tu przegląd rozmaitych konstrukcji jazowych z ich zamknięciami, zapór ziemnych, kanałów, sztolni i rurociągów. Zobaczyć można rzadko stosowaną w Polsce turbinę Peltona w elektrowni Bielkowo. W artykule przedstawiono oryginalną konstrukcję i zasadę sterowania zamknięciem segmentowym z przeciwwagą w zależności od poziomu górnej wody. Często spotykanym rozwiązaniem przy modernizacji i remontach wysłużonych konstrukcji jest wymiana napędów na nowe o konstrukcji współczesnej. W tym wypadku podjęto decyzję odbudowy według pierwotnego projektu. Celem artykułu jest zwrócenie uwagi na zabytkowy charakter obiektów hydrotechnicznych na rzece Raduni, wartych zachowania w istniejącej postaci dla następnych pokoleń jako przykładu rozwoju myśli technicznej.

The cascade of the river Radunia is a valuable monument of hy-drotechnics. We have here a review of various weir constructions with their locks, earth dams, channels, drifts and pipelines. In the hydropower plant Bietkowo one can see the rarely used in Poland Pelton's turbine. The paper presents an original construction and principles of operation of the radial gate with counterweight according to the level of the headwater. In the majority of cases the solutions of modernization and repairs of the worn out constructions are based on replacement of driving gears by new and modern once. In this case the decision has been undertaken to carry out the reconstruction according to the original plans. The aim of the paper is to draw attention to the monumental character of hydrotechnical objects on the river Radunia which are worthy of preservation in the present form for future generations as an example od development of technical ideas.