US8378512B2 – Wave Energy Harvester With Improved Performance – Google Patents

Each WEH device includes a buoy 102 or other water flotation device attached to a tether 104 that is connected to an anchor on the sea floor as shown in FIG. The hydrodynamic energy acting on the buoy or other water flotation device results in changes in force within the tether, which in turn changes the stress within the magnetostrictive core and consequently changes a magnetic property. The method includes: tethering a water flotation device to an anchor by a tether, wherein the tether comprises a magnetostrictive component, the magnetostrictive component comprising a pre-stressed magnetostrictive core, wherein a magnetic property of the magnetostrictive core is configured to change with changes in stress within the magnetostrictive core along at least one direction within the magnetostrictive component. In one embodiment, an initial bias magnetic field 704 is applied 820 to the magnetostrictive component 108, such that the initial bias 704 results in some magnetic flux density within the magnetostrictive component 108. The bias 704 may be a magnetic bias created by permanent magnets proximate the core 110. A physical pre-stress force may be applied to the component 108 before connecting the tether to each of the buoy 102 or the anchor 106. In one embodiment, the bias magnetic field is directed through the magnetostrictive core through the use of one or more flux paths comprising magnetically permeable material.

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vectors - Virtual rolling contact joint - Mathematics.. Essentially, in the as-processed state, the magnetic domains 702 in the poly-crystalline alloy may be randomly oriented and have a net zero magnetic moment. Specifically, the application of a compressive pre-stress impacts the magnetic permeability, and therefore the magnetic flux density (B) within the alloy for a given applied magnetic field (h). Another embodiment of the wave energy harvester (“WEH”) may have a significant benefit on the ocean energy landscape due to its unique combination of low capital/maintenance costs, ruggedness and reliability relative to competing technologies and ability to function well in low to moderate wave-height locations.

In one embodiment, methods and devices are included to incorporate magnetostrictive components 108 with the appropriate combination of bias magnetic field and pre-stress that will provide the maximum change in the B-Field in specific magnetostrictive alloys into systems that are designed to generate electric power by harvesting energy from the ocean. For the purposes of this description, a magnetostrictive material may be considered to be any material that can be designed or configured such that a change in applied stress can result in a change in the magnetic flux and/or magnetic field (the B-field) within the material. In some embodiments, a process to assemble magnetostrictive cores 110 and/or components 108 into mechanical fixtures can be used to pre-stress the cores 110 or components 108. In these compression fixtures, strain sensors attached to the magnetostrictive components can be used to determine the stress/strain state of the component that is being loaded.

Dolor Espalda Cáncer Pulmón

While detailed power and cost modeling indicates that a device using magnetostrictive alloys such as iron-aluminum can be competitive with coal based power generation, significant improvement may be achieved by identifying and implementing specific design improvements that can increase the magnetic field change achieved within the material. For example, consider the curve 505 for the bias magnetic field of 22.3 Oe in FIG. FIG. 4 depicts a graph diagram of one embodiment of magnetic and magnetostrictive properties of Alfenol. A schematic of one embodiment of the magnetostrictive components 108 that make up the tether 104 is shown in FIG. This effect has been studied in great detail for new magnetostrictive materials such as iron-gallium (Fe-Ga) alloys, and the data is shown in FIG. Mo-Mo additions up to 4% in Fe-Al alloys have shown to reduce corrosion weight losses by an order of magnitude. For a specific alloy, magnetic measurements similar to that shown in FIG.

Las reacciones fisiológicas desencadenan nuevas percepciones de miedo que incrementan las reacciones del cuerpo de una manera cíclica y creciente. Como curar dolor de rodilla . Una vez concebida la idea que desencadena el pánico, la crisis fisiológica y psicológica se activa como consecuencia del círculo creciente de percepciones mentales y reacciones corporales de miedo. La cadena de percepciones de la mente y reacciones del cuerpo se produce rápida y secuencialmente en una escalada incontrolada que conlleva a la crisis. Intento de control. El control sobre el comportamiento fisiológico y sus reacciones redunda en un ciclo perceptivo-reactivo para obligar a entrar al sujeto en acción a fin de afrontar el miedo.

A menudo el individuo siente que está en peligro de muerte inminente y tiene una necesidad imperativa de escapar de un lugar o de una situación temida (aspecto congruente con la emoción que el sujeto está sintiendo). La mente evoca imágenes en las que el sujeto no ha podido controlar el episodio anteriormente y se envía un mensaje de protección al cuerpo. Afrontar el pánico requiere tiempo y paciencia para redefinir las actitudes frente al miedo extremo para enfrentarse al miedo y no evitarlo. Controlar el pánico requiere tiempo y paciencia para redefinir las actitudes frente al miedo extremo para enfrentarse al suceso que lo provoca y no evitarlo.