Avila sapienza-may2015
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Transcript of Avila sapienza-may2015
Research Seminar
SUZANA MOREIRA AVILAAssociate Professor
University of Brasilia – BrazilRome, May 29th 2015
Resumé
• 1993 - Civil Engineer – University of Brasilia
• 1997 – Master in Structural Engineering – University of Brasilia
• 2002 – Doctor in Structural Engineering - Pontifical Catholic Universityof Rio de Janeiro
• 2002-2008 – Associate researcher – University of Brasilia
• 2008 – now – Associate professor – University of Brasilia
Expertise
• Structural Dynamics
• Structural Control
• Structural Optimization
• Numerical Analysis and Computational Methods
Research Partner’s
Prof. Marcus Morais
Structural Dynamics
Computational Mechanics
Fluid structure Iteraction
Prof. Maura Shzu
Computational Mechanics
Structural Optimization
University of Brasilia
Darcy Ribeiro Campus
University of Brasilia
Gama Campus
Structural Control
• It is a technology to reduce excessive vibration in structures caused by dynamic loadings such as wind and earthquakes.
• Although it was developed first in aerospace engineering, this technology has fastly spread to Civil Engineering
Structural Control
• Structural control provide changes on stiffness and dampingproperties of the system, installing external devices or applyingexternal forces, aiming to reduce original structure vibrations.
• It can be classified as passive, active, semi-active and hybrid.
Footbridge in Brasilia
A gym floor, that presented real excessive vibrations, located in a commercial building situated in the city of Brasilia, Brazil
Tuned Mass Damper TMD
m
g(t)
k
cK
C
M
f(t)
Dynamic testing platform
• Situated at the Structure Laboratory there is a testing platform with a very low fundamental frequency and presenting excessive vibrations.
Dynamic testing platform
• Tuned mass damper.
Tuned mass damper to reduce floor vibration
Structural control of adjacent buildings
Numerical model of National Brasilia Stadium
Wind Turbines: model, control and optimize
Wind turbine tower
The tower is about 20% of the total cost!
Wind turbine tower dynamic analysis
Numerical modelling of the wind turbine tower
Numerical modelling of the wind turbine tower
Vibration control of the wind turbine tower
Kp,CpFs(t)
Ks
Cs
Ms
Mp
(t)
L
y(t)
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1,60
1,80
0,8 0,9 1,0 1,1 1,2 1,3 1,4 1,5
a = wP / wS
RMS m=0, 06
m=0, 08
m=0, 10
Vibration control wind turbine
Floating Offshore Wind Turbine
Hywind, Norway
Offshore wind turbine model
Structural ControlTunned Mass Damper Inverted Pendulum
0 50 100 150 200 250 300-0.06
-0.04
-0.02
0
0.02
0.04
0.06Comparacao - Com AMS vs Sem AMS
Tempo [s]
Am
plitu
de d
e T
heta
[ra
d]
Sem AMS
Com AMS
Offshore wind turbine vibration control
Developing, Next steps, ideas, etc
• Optimization of tmd parameters
• Tower Optimization
• Blade effects
• Semi-active control
• Seismic analysis
• Vibration control of blades
Thanks for your attention!!