Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: structural dynamic response

Sortuj według:

Ogranicz wyniki do:

Study on dynamic response of offshore wind turbine structure under typhoon

Li Junlai, Wu Weiguo, Wei Yu, Shu Yu, Lu Zhiqiang, Lai Wenbin, Jia Panpan, Zhao Cheng, Xie Yonghe

Polish Maritime Research

2022

nr 1

34--42

Floating offshore wind turbines are easily affected by typhoons in the deep sea, which may cause serious damage to their structure. Therefore, it is necessary to study further the dynamic response of wind turbine structures under typhoons. This paper took the 5MW floating offshore wind turbine developed by the National Renewable Energy Laboratory (NREL) as the research object. Based on the motion theory of platforms in waves, a physical model with a scale ratio of 1:120 was established, and a hydraulic cradle was used to simulate the effect of waves on the turbines. The dynamic response characteristics of offshore wind turbines under typhoons are systematically studied. The research results clarified that the turbine structure is mainly affected by wave loads under typhoons, and its motion response reaches its maximum value under the action of extreme wave loads. The research results of this paper can provide reference value for the design of offshore wind turbine structures under typhoons.

Advanced dynamic methods for structural evaluation of TV towers

Osterrieder P., Beirow B.

Zeszyty Naukowe. Budownictwo / Politechnika Opolska

2003

z. 47

103-115

On the background of the demand for an extended transmission capacity, the principles of static and dynamie behaviour of reinforced TV and telecommunication towers were investigated exemplarily at the Cottbus tower. The experimental part of the investigations is based on wind tunnel tests and permanent long-time measurements by a monitoring system acquiring data of wind situation and vibration velocity. The numerical part of the investigations was covered by conventional stochastic and deterministic methods for the calculation of the structural response due to along-wind and vortex shedding as well as by a new, hybrid and more close to reality numerical method based on neural networks. It could be shown that the serviceability of the Cottbus tower is actually not subjected to danger. The largest inclinations concerning permanent operation of transmission facilities result from along-wind and nonuniform temperature loadings over the shafts cross-section. As the most critical loading, with regard to questions of comfort and long-time behaviour, vortex shedding at the aerial antenna could be identified. Moreover, considerable reserves with a view to an extension of transmission facilities could be proved. Nevertheless, it was shown that these extensions cause a considerable increase in along-wind loadings, which could effect a critical structural response in case of towers having a lower stiffness. In order to avoid any risk from the outset, a strategy for planning operational changes was proposed on principle.