منابع مشابه
Wind Turbine Tower Resonance
Wind turbine towers are large structures designed to withstand the unique loading conditions imposed on them by the turbine’s nacelle and dynamic forces from the rotating blades. Observations and noise measurements of a particular wind turbine showed high noise levels at approximately 48 Hz, which could not be explained from the usual known potential noise sources. Correlated far field noise me...
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Leaf shape, including leaf size, leaf dissection index (LDI), and venation distribution, strongly impacts leaf physiology and the forces of momentum exerted on leaves or the canopy under windy conditions. Yet, little has been known about how leaf shape affects the morphological response of trees to wind load. We studied eight Quercus species, with different leaf shapes, to determine the morphol...
متن کاملOffshore Wind Turbine Tower Fore-Aft Fatigue Load Reduction by Coupling Control and Vibrational Analysis
The present study proposes a novel tower-control technique that couples linear control feedback theory with an online time-frequency analysis of the tower vibrations, with the aim to widen the research area of situational control of wind turbines. Numerical simulations were conducted for two 5MW-class offshore wind turbines, and the performance of the proposed control method has been tested in ...
متن کاملStudy of Degradation of Dry Cooling Tower Performance under Wind Conditions and Method for Tower Efficiency Enhancement (RESEARCH NOTE)
Wind affects adversely the cooling tower thermal performance. A field investigation was carried out to study the thermal performance of Heller cooling towers under wind conditions, involving measurement of wind velocity and its direction around the cooling tower, and obtaining water flow rates and temperatures at the cooling tower inlet and outlet. Results show that air suction at the tower top...
متن کاملInfluence of modeling in the response of steel lattice mobile tower under wind loading
These days there is an unprecedented rise in the number of lattice towers due to an ever increasing demand in communication. Lattice towers are 3D space frames that for design are conventionally analyzed as 2D trusses. For safety and economy, these designs need to be more rigorously analyzed considering them as 3D frames. In this study, two lattice towers of heights 18m and 40 have been analyze...
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ژورنال
عنوان ژورنال: MATEC Web of Conferences
سال: 2017
ISSN: 2261-236X
DOI: 10.1051/matecconf/201710700084