However, depending upon which portion of the helix is immersed in water, the center of buoyancy B will shift axially. A spacing of one-half the pitch might be more desirable for horizontal stability of the system in high waves. The corresponding adjacent ends of the helices are axially spaced from one another by a distance equal to one-quarter the pitch. As previously discussed, for one pair of helices to exhibit equilibrium in still water, one helical strip must be rotated half a revolution with respect to the other of the pair. Its positions of hydrostatic equilibrium are found with the axis tilted with respect to the surface of the water. The above-named patents disclose a generally suitable approach to conversion and use of the energy found in waves within a body of water. 3, the respective centers of buoyancy for each helix will be found at symmetrically opposite positions with respect to the center of gravity of the device and the composite center of buoyancy will be on the same vertical line as the center of gravity.
Dolor En El Hombro
13 comprises dual rotational buoyant masses 60 and 60′, also rotating in opposite directions, and laterally spaced from one another by means of strut 76. Each of the rotational masses is coupled to conversion means 64 through appropriate universal joints 66. The opposite torques applied to energy conversion means 64 maintain the latter in a stable angular position.
Dolor De Estomago
10. More importantly, due to the unique stability of the apparatus of the present invention, the rotational masses 60 associated with each embodiment can be freely floated on the surface of the body of water, eliminating the need for bearings and associated means for securing the apparatus in a horizontal position by means of rigid structures or taut cables affixed to the sea floor. The present invention is concerned with an improved variety of wave energy conversion apparatus which comprises a rotational buoyant mass, the operation of which is not limited by the above-described drawbacks. The descriptions above have been given as illustrating examples, and therefore should not be interpreted as limiting the shape of the invention. Smaller waves will not be effective to provide sufficient torque to set the helix into rotary motion.
- Chaquetas impermeables para nieve
- Frutos secos
- Cuela y sírvelo
- Trabajar o estar en entornos demasiado ruidosos o contaminados
- Alcohol polivinílico, un material plástico que parece arena gruesa
It will be noted that the center of gravity of the helix, designated by G, remains axially fixed throughout the rotary cycle. 10, the freely floating rotational buoyant mass of the present invention, designated by reference numeral 60, is operatively coupled through universal joints 66 and reduction gear 68 to conversion means 64. This means may comprise an electrical generator, or some similar device. Also, since the self-induced torques resisting rotary motion are eliminated, the buoyant rotor of the present invention may be set into rotary motion by waves of relatively low amplitude. Low amplitude waves are unable to create torques large enough to rotate the helix from one angle of equilibrium to another. Additionally, the buoyant mass is in rotational equilibrium at all angles of rotation about its axis when freely floating on the water surface.
The center of buoyancy of the rotational buoyant mass remains in a fixed axial and radial location for all angles of rotation of the mass. In a helical volume, two cross-sections are identical but rotated with respect to one another by an angle proportional to the axial distance separating them.
6-7, two helical lines from one pair, such as H1 and H’1, or H2 or H’2, must be displaced from each other by a rotation of half a revolution, and an axial translation. The dashed lines show these strips once unrolled in the plane of the figure. 7D. Dolor lateral interno de rodilla . This means that the vertical width of the unrolled combination of helices must be πR at its maximum vertical width, along line D of FIG. 4, in that the respective helices 40 and 42 form a unitary buoyant mass.
Dolor Espalda Media
Helices 40 and 42 are rotated with respect to one another by one-half revolution. Therefore, in FIG. 6, the two helices of one pair are displaced one from the other by a rotation of a half revolution plus a translation λ/4. Phantom lines 26 serve to illustrate the fact that helix 20 could be continued an additional length equal to one half its pitch in order to meet the adjacent end of helix 22. In addition to being axially spaced by a distance equal to one-half the pitch, the helices are angularly displaced with respect to one another by one-half a revolution, or 180°, about axis 12. As embodied herein, each helix has a length equal to its pitch.
7, taken along lines A-D thereof, respectively. The FIGS. 6-7 embodiment comprises various flats, or shoulder portions, 44, 46, 48 and 50. Remedios para dolor de rodilla . These shoulders exhibit resistance, or drag, to wave motion along the axis of the rotational mass, diffusing some of the incoming wave energy and reducing the overall efficiency of the apparatus. The apparatus is positioned in a body of water so that surface waves within the body will pass generally along the axis 12 of the device. The only way to alleviate these problems associated with the prior art apparatus would be to maintain the axis of the helix in a horizontal position at the water level. As a result, the axis of the mass remains in a stable position when freely floating in still water at any angle of rotation about the axis. As a result of the existence of the four preferential angular positions, in order to set the helix in rotation from one preferential position to another, one must create a non-zero torque during a quarter revolution until the first unstable equilibrium position is reached.
Tipos De Dolor Dental
Furthermore, the horizontal position of the axis is stable only at 180° and 360°, with the result that only two rotational positions of the mass are positions of stable equilibrium. The result is a fluctuating couple varying cyclically with the rotation of the helical mass 11. The fixed bearings supporting the helix will therefore be subject to cyclical stresses and require frequent replacement in order to maintain the apparatus in proper operating condition. 3 will always maintain a horizontal axis. A helically shaped buoyant mass is curved around an imaginary or real axis of rotation. Then around the imaginary cylinder containing the outer face of this layer, one can roll another combination of strips, similar to the previous one, but dimensioned to accommodate the new radius, and so on, until the desired final radius is obtained. What has been described thus far is a combination of flat strips rolled around an imaginary cylinder.
Tipos De Dolor Crónico
One can consider that the strips have a certain radial thickness, so that rolling several strips one above the other will finally yield a desired radial thickness of the resulting volume. As the inventive apparatus is embodied herein, each helix must have a length equal to its pitch or a multiple of its pitch. As embodied herein, the length of each volume is preferably an integer multiple of its pitch. FIGS. 2A-2H illustrate the forces acting upon a prior art device similar to that of FIG.
Dolor Espalda Lado Derecho
FIGS. 9A-9D show the cross-section of the volume of FIG. FIG. Dolor de cadera derecha y pierna . 3 illustrates a first embodiment of a rotor constructed in accordance with the principles of the present invention. FIG. 4 illustrates an embodiment of the present invention comprising helical volumes 30 and 32 positioned about a common axis of rotation. FIG. 3 illustrates a first embodiment of the buoyant mass of the present invention, comprising two helical volumes, axially separated from one another. As embodied herein, the rotational buoyant mass associated with the apparatus of the present invention comprises at least a pair of helically configured volumes jointly rotatable about a common axis. FIGS. 4 and 5 illustrate additional embodiments of the buoyant mass of the present invention, comprising helical volumes which are contiguous with one another, forming essentially a unitary buoyant mass. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
At all other rotational positions, the eccentrically located buoyant force will generate a non-zero torque about the axis. FIG. 7 illustrates the overall configuration of the buoyant mass formed in accordance with the illustration of FIG. FIG. 1 illustrates the wave energy converter disclosed in U.S. Since mechanical energy is more easily used and transferred if in the form of a continuous rotation, sophisticated mechanisms, such as hydraulic pumps and hydraulic motors, have to be used to transform the alternating motions of the various parts into a rotary motion.