C6: Fold sizes at trailing edge, in inches: 0.2; 0.25; 0.2. Fold sizes midway between leading and trailing edge: 0.1; 0.125; 0.1. Results: The trailing edge exhibited coherent strong oscillations in a fundamental mode. That is, the total curvature between the front edge and the back edge, and the total curvature between to top side and the bottom side, of the sheet, required to provide the desired oscillation mode, should be independent of scale of the sheet. Increasing the length of extension of the sheet between the two fixed points increases the wavelength of the preferred fundamental mode and reduces the frequency of that mode, and increases the number of allowed modes of oscillation in any frequency or wavelength range, for standing wave oscillations along the direction between the two fixed points. Magnitude of curvature of a curve is 1/R. Direction of a curvature vector points from the sheet towards the origin of the circle defined by the curvature.
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Most preferably, the curved sheet extends more than 90 percent, and preferably over the entire length between the two fixed or substantially fixed points. The leading edge oscillates in a sideways direction, which sideways direction is (1) perpendicular to the fluid flow and (2) perpendicular to a line connecting the two fixed points. Oscillations in tension along tensioner 10 caused by a fluid oscillator device (not shown) oscillating in respond to fluid flow generates a periodic variation in tension in tensioner 10. The periodic variation in tension drives magnet M periodically up and down.
Dolor De Hombro
These periodic motions and tensions may be coupled to energy conversion device 30 to extract energy from the oscillator. David Labrecque has disclosed a rotating wing system for energy conversion, which uses oscillations in the length of a tensioning line for energy conversion. The curved sheet 20 and related fluid flow conversion devices described herein may have their tensioner line at any angle relative to the vertical, from zero to 90 degrees. Shortening the extent of the curved sheet in the dimension parallel to the direction of fluid flow eliminates longer wavelength and lower frequency modes of oscillation in the sheet along the direction of fluid flow. Substantial non preferred oscillations towards the trailing edge, and at a higher frequency than the preferred oscillations. The frequency of oscillation in the X-Z plane is 2 times fo, 2fo. The magnitude of oscillation in the X-Z plane (along the fluid flow direction) is smaller than in the Y-Z plane (perpendicular to the fluid flow direction).
Both the length of the sheet along the fluid flow direction and the length of the sheet perpendicular to the fluid flow direction may be increased to provide for an increased oscillating tension in the tensioner, and the strength of the tensioner may be increased. Dolor de espalda baja y estomago . If the leading edge of the sheet is convex (when under no stress) and the leading edge is mechanically coupled to the tensioner, then tension in the tensioner induces stress along the direction of tension, in the curved sheet near the tensioner, changing the curvature of the curved sheet. Preferably, the curved sheet extends at least 60 percent of the length between the two fixed or substantially fixed points. The hub structure 14 consists of a vertical axle 26 with top 26a and bottom 26b flanges that provide center attachment points for cross tubes 14b and struts 14a. The upper cross 14b and lower struts 14a merge outward from the axle 26 and join to form a truss to support the cable guides 18 and upper spokes 22. The ends of these parts 14a, 14b are swaged to facilitate attachment.
Fig. 2B, is an illustration showing oscillation in the X-Z plane of the preferred fundamental mode of the device shown in Fig. Fig. 6C shows an X-Z plan view of the curved sheet at different phase of oscillation in the preferred fundamental mode than for Fig. Observation shows that tension in the tensioner in such structures tends to reduce curvature near the leading edge or the curved sheet. 18B shows tension applied to tensioner 10 expanding slack regions 185, 186, 187, 188. This causes expansive stress to leading edge 50 lengthening leading edge 50 relative to trailing edge 60. This causes strain in the remainder of sheet 20 resulting in curvature in both X and Z directions. It should be clear that similar strain will be effective in inducing oscillations in the preferred fundamental mode in other fluids, such as water. Anemia y dolor de espalda . This condition severely limits the size of the rotor and adds to its cumbersome construction.
The top two antifriction devices of the power shaft are tapered roller bearings and are situated near opposite ends of the solid upper portion of the power shaft 32. These bearings are faced in opposite directions in wooden, cylindrical blocks that carry the weight and lift exerted by the rotor. This mechanism includes a plurality of the saw toothed rack 90 and pinion 93 mechanisms of Fig. The slip linkage may for example use a saw tooth rack for each linear oscillation. The curvature in the curved sheet damps all modes of oscillation in the curved sheet structure except for the mode indicated by positions of the tensioner 10 a different times, shown in Figs. The shape factor depends upon the angle between the wind velocity direction and normal to the opposing region of the curved sheet and is of order 1. Sheet volume decreases with decreasing sheet width and accordingly selecting a thin enough sheet enables curvature to switch at a given fluid and fluid velocity.
No uniform period oscillation along the leading edge was detectable under the following two conditions. This included during the twirling tests in which wind speed at the top of the pole was greater than wind speed at the bottom of the pole, which means that the damping of other modes of oscillation was effective over a large differential in wind velocity along the length of the sheet. Initially, without any tension in the leading edge, device did not oscillate.
C5: Fold sizes at trailing edge, in inches: 0.8; 01.0; 0.8. Fold sizes midway between leading and trailing edge: 0.4; 0.5; 0.4. Results: Leading edge was initially concave. Even when tension on the leading edge was relaxed before application of wind flow, application of wind flow resulted in oscillation. In this type of structure, the line of tension be set back from the leading edge because the leading edge is rigid and therefore will not deform and folder over in response to fluid flow, or become convex due to stress resulting from curvature in sheet material behind the leading edge. Alternatively, plural sheets of similar design may all be coupled using linearly oscillating linkages to rotationally drive a single shaft in which the frequency, phase, and magnitudes of linear oscillations of each of the plural sheets can be different from one another.
The earlier smaller devices indicated the existence of oscillations in the preferred fundamental mode for sheets of any length (from a few centimeters to a couple feet long in the fluid flow direction and for the airs speeds of about 3-10 miles per hour (generated by a set of 4 vertically stacked box fans).
Dolor Espalda Media
Duct tape secured the hemp rope in extended form at each end of the passageway, to prevent the sheet from slipping toward the middle of the hemp rope and crunching up during fluid flow. FIGS. Dolor muscular por diabetes . 7, 8 show the preferred embodiment of the wind turbine with its mast 30, transmission components and arrangements. The inflated sail 10a pulls on the cables 16 until its partner sail 10b is drawn tightly over the frame. Results: It did not oscillate substantially in the preferred mode. Symmetry and energy arguments noted above indicate that the sign of curvature in both direction switch sign substantially concurrently.