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Res.dual s.res. Cons.deration in Fatigue Damage of Offs.ore Wind Turbine Monopiles. To Be or Not to Be?

World Journal of Mechanics 2020年第4期10卷 39-52页

作者： Adelani A. Oyeniran duabari s. aziaka Department of Advanced Mechanical Engineering Cranfield University Bedfordshire UK Centre for Propuls.on Engineering Cranfield University Bedfordshire UK

The purpos. of this.paper was.to inves.igate the impact of res.dual s.res.es.on fatigue damage of offs.ore wind turbine monopiles.by numerical analys.s.approach us.ng ABAQUs.s.ftware, a finite element analys.s.(FEA) tool. Three monopile models.with the s.me dimens.on (within s.andard range) have been developed in ABAQUs.and partitioned circumferentially into equal rings. Longitudinal partitions.have been rotated through 180°as.obtainable in practice. Characteris.ic loads.typical of a real life offs.ore wind turbine environment have been applied to all three models. with tens.le and compres.ive res.dual s.res.es.applied as.additional loads.at the critical weld region to the firs. and s.cond models.while the third model had no additional load. With zero boundary conditions.applied in all s.x degrees.of freedom, the s.mulation has.been run for 107 cycles.of wind and wave loads.as.recommended in s.andards.in each cas.. s.res. res.lts.obtained from the critical weld region in the three models.s.owed that the pres.nce of tens.le res.dual s.res.es.equal to the material yield s.res. contributed a maximum 0.05% to fatigue damage of the monopile when compared with res.lts.from the model with no res.dual s.res. while the pres.nce of compres.ive res.dual s.res.es.with the magnitude of the yield s.res. of the material caus.d a gain of 0.06% in fatigue life by s.milar comparis.n, indicating negligible contribution of res.dual s.res.es.to the s.res. build up in the critical weld region, thus.s.gges.ing that the magnitude of the res.dual s.res. as.high as.the yield s.res. of the material of the monopile is.not large enough to caus. the monopile to open up in the axial direction.

关键词： Concentrated Force Characteris.ic Loads Pos.-Weld Heat Treatment s.N Curve s.perpos.tion

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s.ructural and Conceptual Des.gn Analys.s.of an Axial Compres.or for a 100 MW Indus.rial Gas.Turbine (IND100)

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World Journal of Mechanics 2014年第11期4卷 332-347页

作者： D. s. aziaka E. O. Os.gwe B. T. Lebele-Alawa Department of Power and Propuls.on Cranfield University Cranfield UK Department of Mechanical Engineering Rivers State University of Science and Technology Port Harcourt Nigeria

The s.ructural des.gn of the IND100 axial compres.or requires.a multis.age interrelations.ip between the thermodynamic, aerodynamic, mechanical des.gn and s.ructural integrity analys.s.of the component. Thes. des.gn criteria, s.metimes.act in oppos.tion, hence engineering balance is.employed within the s.ecified des.gn performance limits. This.paper pres.nts.the s.ructural and conceptual des.gn of a s.xteen s.age s.ngle s.aft high pres.ure compres.or of IND100 with an overall pres.ure ratio of 12 and mas. flow of 310 kg/s.at Is.s.s.conditions. Furthermore, in order to evaluate the conceptual des.gn analys.s. bas.c parameters.like compres.or s.zing, load and blade mas., dis. s.res. analys.s. bearings.and material s.lections. conceptual dis. des.gn and rotor dynamics.are cons.dered us.ng exis.ing tools.and analytical technique. Thes. techniques.employed the bas.c thermodynamic and aerodynamic theory of axial flow compres.ors.to determine the temperature and pres.ure for all s.ages. geometrical parameters. velocity triangle, and weight and s.res. calculations.of the compres.or dis. us.ng s.gers.r Empirical Weight Es.imation. The res.lt analys.s.s.ows.a cons.ant hub diameter annulus.configuration with compres.or overall axial length of 3.75 m, tip blade s.eed of 301 m/s. maximum blade centrifugal force s.res. of 170 MPa, with major emphas.s.on indus.rial application for the s.ructural component des.gn s.lections.

关键词： Gas.Turbine s.ructural Des.gn Conceptual Des.gn Analys.s Axial Compres.or Mechanical Integrity

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