Aerodynamic Structural Noise - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 211

•. Sea.level.standard.temperature. T 0 .=.288.15.K
•. Earth.surface.gravitational.acceleration. g .=.9.80665.m/s 2
•. Temperature.lapse.rate. L .=.0.0065.K/m
•. Universal.gas.constant. R .=.8.31447.J/(mol·K)
•. Molar.mass.of.dry.air. M .=.0.0289644.kg/mol

Temperature.at.altitude. h .meters.above.sea.level.is.given.by.the.following.
formula.(only.valid.inside.the.troposphere):

. T.=.T 0.. -.L·h. (7.16)

The.pressure.at.altitude. h .is.given.by:

g M
R L

−
−

L h
T

i

p = p 1 -

. i . (7.17) 0

0

Density.can.then.be.calculated.according.to.a.molar.form.of.the.original.
formula:

p M
R T

i
i

. ρ = . (7.18)

7.6 OffshoreSupportStructuresfor

PowerWindTurbineBlades

7.6.1 Introduction

Support.structures.for.offshore.wind.turbine.blades.have.a.highly.dynamic.
behavior.. Complex. wind. and. hydrodynamic. loading. and. permanently.
changing. severe. conditions. are. complicating. these. tasks.. The. integrated.
effect.of.the.wind.and.wave.loads.requires.lexibility.from.the.wind.turbine.
control.systems.
In.a.severe.situation,.the.total.loading.is.likely.to.be.signiicant.compared.
to.the.sum.of.the.constituent.loads.

7.6.1.1 Support Structure Design

Support.structure.design.has.some.requirements: