The increasing size of modern wind turbines also increases the structural loads caused by effects such as turbulence or asymmetries in the inflowing wind field. Consequently, the use of advanced control algorithms for active load reduction has become a relevant part of current wind turbine control systems. In this article, an individual blade-pitch control law is designed using multivariable li...

The increasing size of modern wind turbines also increases the structural loads on the turbine caused by effects like turbulence or asymmetries in the inflowing wind field. Consequently, the use of advanced control algorithms for active load reduction has become a relevant part of current wind turbine control systems. In this paper, an H∞-norm optimal multivariable control design approach for a...

This paper examines the dynamics and control of a variable blade pitch wind turbine during extreme gust subject to actuators saturation. The mathematical model is derived using Lagrange dynamics. controller formulated Takagi–Sugeno fuzzy utilizes parallel distributor compensator obtain feedback gain. controller’s objective generator electromagnetic torque angle attenuate external disturbances. ...

This paper addresses the feasibility of using trailing edge flaps to reconfigure a helicopter rotor blade following a failure of the pitch link, which makes the blade freefloating in pitch and otherwise uncontrollable. A coupled rotor-fuselage model is developed which allowed for rotor anisotropy. A new, optimization-based, trim procedure is developed to determine the dynamics of the failed bla...

Stability and control of rotors at high advance ratio are considered. Stability of teetering, articulated, and gimbaled hub types is considered with a simple flapping blade analysis. Rotor control in autorotation for teetering and articulated hub types is examined in more detail for a compound helicopter (rotor and fixed wing) using the comprehensive analysis CAMRAD II. Autorotation is found to...

In the title compound, C(12)H(10)BrN, the dihedral angle between the benzene rings is 52.5 (1)°, whereas the pitch angles, or the angles between the mean plane of each aryl group 'propeller blade' and the plane defined by the aryl bridging C-N-C angle, are 19.6 (2) and 36.2 (3)°. While the N-H group is not involved in hydrogen-bonding inter-actions, the structure exhibits a network of inter-mol...

In this manuscript, a new method is proposed to provide a perfect tracking of the supercavitation system based on a new two-state model. The tracking of the pitch rate and angle of attack for fin and cavitator input is of the aim. The pitch rate of the supercavitation with respect to fin angle is found as a non-minimum phase behavior. This effect reduces the speed of command pitch rate. Control...

The present work is to design a passive pitch-control mechanism for small horizontal axis wind turbine (HAWT) to generate stable power at high wind speeds. The mechanism uses a disk pulley as an actuator to passively adjust the pitch angle of blades by centrifugal force. For this design, aerodynamic braking is caused by the adjustment of pitch angles at high wind speeds. As a marked advantage, ...

We present, for the first time, mean deflection evolution of a flexible rotor blade using coupled model based on Navier–Stokes equations, fluid flow, and linear elasticity equations deformation. Three turbulence models are tested to reach Reynolds numbers as high 8 104. The absolute tip speed ratios in range [0,25]. numerical results validated by comparisons with available displacements from ex...

In this paper we present an instrumentation system which integrates inertial motion sensing and mobile computing technologies to acquire sensory information during on-water rowing. The use of miniaturized piezoelectric gyros is proposed and tested to sense the oar rotation. By time-integrating the gyro output signal, the pitch angle, namely the angle the blade is away from perpendicular to the ...