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In both the horizontal and vertical axis embodiments 10, 70, the AoA of the wings 20, 22 is actively adjusted to generate rotational motion of the frame 12, including the central axis member 14. A sensor 64 measures the rotational rate and angular position of the frame 12, and this information, along with the wind speed determined by the wind sensor 60, is used by a controller 62 to actively adjust the AoA of the wings 20, 22 when the frame 12 reaches a pre-determined orientation. The first and second wings are pivotally mounted to the frame to allow the angle of attack to be adjusted. Another embodiment of the invention includes a method of generating electricity, including the steps of providing a fluid flow-powered generator having a rotatable frame with a central axis member, a first wing and a second wing attached to the frame, and a controller, wherein the first wing and second wing each have an adjustable angle of attack.

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Fisioterapia infantil: cómo funciona y sus ventajas para.. 1, the rotating frame 12 with mounted first and second wings 20, 22 is elevated on supports 26 to allow rotation of the frame 12 about the central axis member 14. The supports 26 and frame 12 are mounted on a rotating table 24. The rotating table 24 rotates so that the leading edges 40 of the first wing 20 and second wing 22 face the incoming wind. Each wing 20, 22 has a leading edge 40, a trailing edge 42, a first end 44 and a second end 46. Each wing 20, 22 also has an angle of attack (“AoA”) which is defined by the orientation of a chord line extending through the leading and trailing edges 40, 42 thereof. 15, 2010, entitled WIND OSCILLATOR FOR POWER GENERATION, which claims the benefit of U.S. 17, 2009, entitled WIND OSCILLATOR FOR POWER GENERATION, the entire disclosures of which are incorporated herein by reference.

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The aerodynamic forces on the entire wing surfaces can be almost uniformly utilized, and the effective wing areas can be easily enlarged while the wing weight is not a critical concern in the design of the present invention. FIG. Dolor lumbar cancer . 3 shows a simplified mechanical model for a wind oscillator 10 driven by the aerodynamic forces on the first and second wings 20, 22. The gravitational forces on the first and second wing are not shown, as they do not play a significant dynamical role when the weights of the wings 20, 22 and the lengths of the transverse arms 16, 18 are balanced. D1 sin δ1| is the torque, f is the frequency of oscillation, and ηtrans is the efficiency of the mechanical system in power transfer. FIG. 5 includes a simplified mechanical model showing the geometric AoA at the corresponding angular position (β) of a wing in a rotational cycle of a wind rotor 10. Alternatively, the effective AoA of the first wing 20 and second wing 22 can be set negatively during the first and fourth quarters of the rotary cycle to generate a counterclockwise torque and motion, and positively during the second and third quarters of the rotary cycle to sustain the counterclockwise torque and motion.

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The controller 62 uses a feedback control loop to continue adjusting the orientation of the first wing 20 and the second wing 22, generating a rotary motion. 1, when used in the rotary mode, the central axis member 14 and wings 20, 22 can also be arranged along a vertical axis to form a vertical-axis wind rotor 70, as shown in FIG. Due to the shape and structure of the rectangular first and second wings 20, 22, as opposed to long, slender blades used for HAWT and VAWT, the requirements for selection of materials are also more relaxed. Therefore wings 20, 22 can be made from light composite materials to reduce the power and energy required to adjust the wings 20, 22 and their size is less limited by the structural requirements of frame 12 to support them.

This arrangement not only adds a weight penalty on a slender blade, but also increases the structural complexity and weakens the structural integrity of the blade. The mean power increases faster when the frequency is larger than 0.45 Hz. These results indicate that the output shaft power is 40-80 kW for the frequency of 0.75 Hz in a wind range of 4-8 m/s that covers the major portion of the distribution of wind speeds V∞. FIG. 13 illustrates the rotational angle (β) and rate dβ/dt as a function of time in a wind rotor 10, for a wind speed of 6 m/s. The performances of the wind oscillator 10 or wind rotor 10, 70 are determined by solving the equation of motion provided above, and the analysis provided herein indicates that the capability of power generation of the wind oscillator 10 and wind rotor 10, 70 is at least comparable to that of a medium-scale wind turbine.

FIG. 2 depicts velocity and force vectors acting on a wing 20, 22 as described herein. FIG. 7 illustrates the induced change in the AoA and the effective AoA after compensating the induced AoA change for the first wing 20. The induced change in the AoA is large in this embodiment, and would alter a prescribed waveform of the geometric AoA if it was not compensated by feedback control. The controller 62 directs the adjustment of the geometric AoA (αg1) to maintain the desired effective AoA (α1) of the wing 20, 22 during operation of the wind-powered generator 10. The actual pivoting of the wing 20, 22 to achieve the desired effective AoA is carried out by a motor 66 controlled by the controller 62. One type of motor 66 that can be used to pivot the wings 20, 22 is a servo motor operably attached to the wings 20, 22 to adjust the AoA.

SUMMARY OF THE INVENTION One embodiment of the present invention includes a fluid flow-powered generator with a rotatable frame, a first wing and a second wing, with each wing having a leading edge, a trailing edge, a first end and a second end. The rate increases with time, and approaches an asymptotic value from the initial condition.