Structural analysis and optimal design of steel lattice wind turbine towers

Stavridou, Nafsika; Koltsakis, Efthymios; Baniotopoulos, Charalampos

doi:10.1680/jstbu.18.00074

Cited by 18 publications

(7 citation statements)

References 22 publications

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“…The gravity loads due to the mass of the tower itself and the mass of RNA (rotor and nacelle assembly) on the tower top can considerably contribute to the compressive loads on the tower structures. The gravity loads can be expressed as: (4) where is the gravitational constant with a typical value of 9.81 m/s 2 .…”

Section: Gravity Loadsmentioning

confidence: 99%

“…Optimising the WT tower provides a pertinent condition to further reduce the cost of onshore wind energy. Methods have been proposed to optimise onshore WT towers based on deterministic approaches [3][4][5], but these may still result in over-engineered structures, because large PSFs are generally used and uncertainties are not accurately accounted for.…”

Section: Introductionmentioning

confidence: 99%

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Reliability-based design optimisation framework for wind turbine towers

et al. 2021

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Section: Gravity Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability-based design optimisation framework for wind turbine towers

et al. 2021

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“…It is also the most critical component according to structural safety under aerodynamic loadings. Taking into consideration all this, optimal design of the tower structures (structural behavior) is of great importance related to the final cost of energy [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical modal analysis of a 850 KW wind turbine steel tower

Ferroudji

2021

IRASE

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The study deals with the numerical analysis aspects that are necessary for identifying of modal parameters of the tower structure as the most important part of the horizontal axis wind turbine, which are basic for the dynamic response analysis. In the present study, the modal behavior of an actual 55-m-high steel tower of 850 KW wind turbine (GAMESA G52/850 model) is investigated by using three-dimensional (3D) Finite Element (FE) method. The model was used to identify natural frequencies, their corresponding mode shapes and mass participation ratios, and the suggestions to avoid resonance for tower structure under the action wind. The results indicate that there is a very good agreement with the fundamental vibration theory of Euler-Bernoulli beam with lamped masse in bending vibration modes. When the rotor of the wind turbine runs at the speed of less than or equal to 25.9 rpm it will not have resonant problems (stiff–stiff tower design). Furthermore, in case the rotor runs at the speed of between 25.9 and 30.8 rpm, the adequate controller is necessary in order to avoid the corresponding resonant susceptible area of the tower structure (soft–stiff tower design).

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“…Several researchers have investigated lattice towers for wind turbine applications [52][53][54][55][56], proposing concepts that may be used to achieve larger widths at the base of the tower, thus providing a larger lever arm to resist the developing moments but at the expense of requiring a more complex erection process, involving a much larger number of on-site bolting. Another line of research investigated friction connections with bolts in shear instead of ring flange connection with bolts in tension [57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

A Novel Tripod Concept for Onshore Wind Turbine Towers

Gantes

Billi

Güldogan³

et al. 2021

Energies

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A wind turbine tower assembly is presented, consisting of a lower “tripod section” and an upper tubular steel section, aiming at enabling very tall hub heights for optimum exploitation of the wind potential. The foundation consists of sets of piles connected at their top by a common pile cap below each tripod leg. The concept can be applied for the realization of new or the upgrade of existing wind turbine towers. It is adjustable to both onshore and offshore towers, but emphasis is directed towards overcoming the stricter onshore transportability constraints. For that purpose, pre-welded individual tripod parts are transported and are then bolted together during erection, contrary to fully pre-welded tripods that have been used in offshore towers. Alternative constructional details of the tripod joints are therefore proposed that address the fabrication, transportability, on-site erection and maintenance requirements and can meet structural performance criteria. The main structural features are demonstrated by means of a typical case study comprising a 180-m-tall tower, consisting of a 120-m-tall tubular superstructure on top of a 60-m-tall tripod substructure. Realistic cross-sections are calculated, leading to weight and cost estimations, thus demonstrating the feasibility and competitiveness of the concept.

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Structural analysis and optimal design of steel lattice wind turbine towers

Cited by 18 publications

References 22 publications

Reliability-based design optimisation framework for wind turbine towers

Reliability-based design optimisation framework for wind turbine towers

Numerical modal analysis of a 850 KW wind turbine steel tower

A Novel Tripod Concept for Onshore Wind Turbine Towers

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