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158 Doru Calarasu et al.
Fig. 9 – Inclination angle of the turbine Fig. 10 – Rotor tilting strength.
rotor axis.
If the system constructive-operational parameters are changed (the damping
coefficient and the return strength decrease), figure 9 shows the evolution of the
inclination angle of the wind turbine rotor axis, while figure 10 depicts the
evolution of the tilting strength.
4. Conclusions
1. The simulation diagram allows both constructive and operational system
parameters and operation testing signals to be altered.
2. Digital simulation may be used to optimize constructive parameters
(balancing components weight, rotor axis section lengths, balancing weight,
damping system characteristics).
3. The analysis of the system responses revealed a good dynamic
performance when using the vertical tilting solution chosen to protect low
power horizontal axis wind turbines.
Acknowledgements. This work has been supported by the Romanian National Fund
for Science and Research through National Centre for Programme Management under
contract No. 21-047/2007.
Received: April 16, 2010 “Gheorghe Asachi” Technical University,
Department of Fluid Mechanics
Iasi, Romania
e-mail: dorucalarasu@yahoo.com