Environmental Engineering Reference
In-Depth Information
X
Monitor oscilloscope
Transient recorder
Z
Y
Z´
10°
Z
Schematic diagram showing the position of acoustic heads installed on surface
of wind turbine blades. Ultrasonic wave test method application.
FIGURE 6.1
Ultrasonic. wave. test. method:. Acoustic. heads. were. installed. at. surface. of. the. wind. turbine.
blade.
The.equation.to.calculate.the.in-plane.modulus.of.elasticity.in.any.direc-
tion.for.an.ininitely.long.plate.is.obtained.for.angle.f..We.solve.the.different.
equations.of.motion.and.strain.are.correlation.in.an.orthotropic.body.
.
Eϕ=C
ϕ
ρ*.(1-μ
1ϕ
μ
2ϕ
).
(6.3)
where:
ϕ.is.the.angle.in.the.direction.of.the.zy.plane;
C
ϕ
.is.the.velocity.in.the.direction.of.the.angle.ϕ;
μ
1ϕ.
μ
2ϕ
.is.the.Poisson's.ratio.in.the.direction.of.the.angle.ϕ.
The.iber.composite.has.high.strength,.stiffness,.and.low.weight.that.can.
be. tailored. to. be. applicable,. and. the. reinforcing. ibers. can. be. oriented. in.
the. matrix. to. provide. strength. in. any. direction.. From. Equation. (6.2). and.
Equation. (6.3),. the. material. properties. of. an. ininitely. long. plate. are. com-
puted.as.follows:
=
C
C
z
y
.
µ
µ
.
(6.4)
ZY
YZ
2
10
ρ
C
g
2
-
C
C
y
.
(6.5)
z
E
=
1
*
µ
.
y
yz
2
2
y
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