In this paper, an interval Type-2 fuzzy logic based pitch angle controller is proposed for fixed speed wind energy system (WES) to maintain the aerodynamic power at its rated value. The pitch angle reference is generated by the proposed controller which can compensate the non-linear characteristics of the pitch angle to the wind speed. The presence of third dimension in the Type-2 fuzzy logic c...

This paper investigates potential improvements that can be accomplished by integral twist-actuated rotor blades regarding helicopter performance and its vibration. The twist deformation is obtained using anisotropic piezocomposite actuators embedded in the composite blade construction. A four-bladed fullyarticulated Active Twist Rotor (ATR) system was built and tested at Langley Transonic Dynam...

Horizontal-axis tidal current turbines have considerable potential to harvest renewable energy from ocean tides. The pitch control system is a critical part of variable-pitch turbines. Existing strategies for mainly rely on flow measurement devices obtain velocities, which are costly and subject many limitations in practical applications, making them unsuitable small off-grid In this paper, we ...

This present study investigates the effect of blade tip configurations, such as sweepback angle and anhedral angle, on performance hub vibratory loads for lift-offset coaxial rotor a 30,000-pound-class high-speed long-range utility helicopter. The rotorcraft comprehensive analysis code, CAMRAD II, is utilized to conduct load analyses rotor. total thrust, torque, individual rotor’s pitch moment ...

A new control strategy based on adaptive second order sliding mode approach is applied to a floating wind turbine system in the above rated region. This controller well adapted highly nonlinear as turbine, and can be easily implemented with very reduced knowledge of modeling. The proposed partially multi-blade coordinates transformation combines collective individual blade pitch control, for po...

This paper shows a few novel calculations for wind speed estimation, which is focused around soft computing. The inputs of to the estimators are picked as the wind turbine power coefficient, rotational rate and blade pitch angle. Polynomial and radial basis function (RBF) are applied as the kernel function of Support Vector Regression (SVR) technique to estimate the wind speed in this study. In...

Abstract. An empirical data set of laser-optical pitch angle misalignment measurements on wind turbines was analyzed, and showed that 38 % the have been operating outside accepted aerodynamic imbalance range. This results from deviations between working design point. Several studies focused consequences this for annual energy production (AEP) loss mention a possible decrease in fatigue budget, ...

Currently the majority of dozing operations are conducted using tracked vehicles with a fixed blade cutting angle. There is interest from industry in exploring alternatives to tracked vehicles for small scale dozing operations because of the limitations of the platform. One alternative is a six-wheeled vehicle with independent drives and an active suspension. This alternative has higher mobilit...