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The offshore wind power industry is gaining popularity for generating large
amount of electricity around the globe. In recent years, it has developed wind turbine and
floater technologies, where abundant wind resources and open sea areas are ideal for
developing wind farms. A wind turbine needs a reliable structural design to harvest
energy from surrounding environmental loads. However, it is common for offshore wind
turbines to be exposed to high dynamic loads, eventually causing fatigue in their
substructure.
To overcome the above limitation, a composite material for the wind turbine is a practical
alternative. It reduces the maintenance and upkeep costs associated with the steel
offshore. It also reduces the tower mass and, the support mass. In this master thesis,
methodology for the fatigue assessment of a composite wind turbine tower that can be
used on a floating offshore platform has been discussed and finite element models are
developed. Additionally, different dynamic analyses and finite element routines are
incorporated into the design process of the turbine tower model.
The thesis report has presented the fatigue methodology for the Floating Offshore Wind
Power Platform and Turbine Tower in Composite Materials. First, it explains why fatigue
life modelling methods for metals and alloys, already developed and validated, cannot be
directly applied to composites. Hence, to develop an efficient fatigue model for composite
materials, it is imperative to understand the specific mechanisms that cause the damage
to a composite material under fatigue and static loading. Next, a particular emphasis has
been placed on designing and developing turbine towers using composite materials. The
model developed has been run under different load conditions. The repetitive
environment load is analysed using BV's in-house software OPERA to evaluate global
structural response. At last, the SN curves and CFL diagrams have been used to figure
out fatigue life damage using the python script.

Composite material, SN curve, CFL Diagram, Turbine Tower, Wind Turbine, --- Ingénierie, informatique & technologie > Ingénierie mécanique

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This volume, through highly selective and rigorous review processes, has collected eight empirical studies showcasing research advances in multiple domains including child first language, adult additional language, and heritage language acquisition. The studies are theoretically motivated and have adopted a spectrum of innovative methodological strategies to achieve a broader understanding of the nature of learning and the learning process. The volume encompasses a wide range of contents: 1) The L1 and L2 acquisition of syntax, semantics, phonetics, and the syntax-discourse interface; 2) Data comparisons across different learner groups: L1 Chinese children, L2 Chinese learners, and Chinese heritage speakers; 3) Acquisition of language skills: speaking, listening, and writing; and last but not least, 4) Instructional interventions including consciousness-raising and metacognitive strategy training. The volume is intended to bridge the gap between research and instruction by helping teachers understand their students and their learning. Informed by research, teachers can opt for appropriate pedagogical approaches and instructional conditions for their students. The volume is guest-edited by Xiaohong Wen, Professor in Applied Linguistics and Chinese language Acquisition at the University of Houston.

Language --- lexical access --- second language speech --- fluency --- accuracy --- complexity --- information structure --- child language acquisition --- Mandarin Chinese --- word order --- Chinese as a foreign language --- consciousness-raising --- obligatory and forbidden contexts --- perfective aspect marker --- rule induction --- Mandarin consonants --- English CFL learners --- L2 perception and production --- Chinese --- listening --- metacognition --- metacognitive strategy --- strategy training --- Mandarin --- polysemy --- verb semantics --- L2 Chinese --- descriptive writing --- metadiscourse --- cohesion --- local --- global --- text --- interactive --- interactional --- sentence-final particle --- Chinese heritage speakers --- features --- lexical access --- second language speech --- fluency --- accuracy --- complexity --- information structure --- child language acquisition --- Mandarin Chinese --- word order --- Chinese as a foreign language --- consciousness-raising --- obligatory and forbidden contexts --- perfective aspect marker --- rule induction --- Mandarin consonants --- English CFL learners --- L2 perception and production --- Chinese --- listening --- metacognition --- metacognitive strategy --- strategy training --- Mandarin --- polysemy --- verb semantics --- L2 Chinese --- descriptive writing --- metadiscourse --- cohesion --- local --- global --- text --- interactive --- interactional --- sentence-final particle --- Chinese heritage speakers --- features