In this embodiment, the force transducer panels are formed of an electroactive polymer material. In the embodiment shown, control or adjustment of the mechanical properties of the tube 24 is achieved by active control of the electroactive material of the panels 26. That is, the panels 26 are adapted to receive an electrical current from a control system 32 to effect mechanical changes within the electroactive material. The coiled conduit 50 is constructed to be resiliently elastic, for example by constructing the conduit 50 from a suitable elastic material and/or by appropriately shaping the conduit 50. In the embodiment shown, the conduit 50 is provided with cross braided nylon reinforcement to control the elasticity and increase the burst strength of the conduit 50. The helical relatively inelastic reinforcement confers anisotropic material properties, such that axial strain of the conduit reduces its internal volume. This arrangement may permit local changes in the area or volume of the fluid cavity to thus achieve effective deformation of the electroactive material and/or at least one conduit.
Reference is first made to FIGS.
The device of the present invention may be an order of magnitude less expensive than existing wave energy devices which rely on steel, concrete or similar construction materials due to the low density of the material. 7, reference to which is now made. Reference is first made to FIGS. FIGS. 10 a and 10 b are diagrammatic representations of a panel of the conduit of FIG. FIG. 6 is an enlarged view of a front end region of the electrical generator of FIG. DETAILED DESCRIPTION OF THE DRAWINGS An example of the present invention is described below in the form of an electrical generator for use in converting wave motion to electrical energy. Los gases producen dolor de espalda . For example the control system 32 is operable to promote reflections of a controlled frequency from at least one portion of the tube 24. The frequency and wavelength of these reflected waves can be matched to the bulge wave in such a way as to produce constructive interference and enhance the energy of the bulge wave.
At least a portion of the waveguide may be arranged to present an impedance to the bulge wave that matches the impedance of a driven apparatus, in order to minimise reflections from the driven apparatus, for example the waveguide may be terminated in an over damped section of waveguide with a closed end, of lumped impedance matched to the main waveguide to terminate the bulge wave without reflection. Additionally, features of the device, such as the power take off apparatus, may not be matched to the dynamic response of the tube, and as such reflections may occur. The power generator described above provides a wide range of control options, including both active and passive control, and control of reflections generated within the generator body, which allow a wide range of control options to be achieved and greatly increase the flexibility of the apparatus. For example, the fluid motion may produce pressure or pressure variations, such as static and dynamic pressures and pressure variations, which may act against the deformable body to establish forces sufficient to deform said deformable body.
For example, where the force transducer comprises an electroactive material, the electroactive material may be adapted to receive an electrical current to effect a desired mechanical output of the electroactive material and thus of the deformable body. According to a third aspect of the present invention there is provided a fluid motion electrical generator comprising a deformable body, at least part of the deformable body being adapted to be deformed by fluid motion within a fluid body, wherein at least a portion of the deformable body comprises an electroactive material adapted to generate an electrical current upon deformation thereof and at least part of the electroactive material is controllable in order to control at least one dynamic response of the deformable body. The deformable body may be arranged to drive at least one energy medium within the apparatus. Each panel 52 comprises one or more conduits 50 arranged side by side.
The wall of the flotation chamber 36 may be arranged to have anisotropic properties, such that when the flotation chamber 36 is stretched, the volume of the flotation chamber 36 at the stretched portion is reduced. 2 b, the outer wall portion of the floatation chamber is flexible but relatively inelastic. The deformable body may comprise a flexible portion, wherein flexure of said flexible portion drives the energy medium, for example, by effecting a deformation of the force transducer.
The conduit may be adjacent to at least one wall of the deformable body. The tube 24 is provided with a spatially distributed sensor arrangement (not shown) coupled with the control circuit, for monitoring a dynamic response of the tube 24. For example, the sensors may be separate strain sensors, pressure sensors, flow sensors and/or sensors used to determine derivatives of strain such as speed and acceleration of the tube walls. In embodiments where the present invention is used or driven by wave motion, the tubular structure may be adapted to be aligned with the principal or predominant wave direction. However these materials have heretofore conventionally been used in transducer applications that require electroactive polymer materials to be secured relative to a fixed frame.
The deformable body and/or force transducer distribution may be configured such that energy is continuously delivered to the energy output whilst said body is being deformed. The dynamic response of the deformable body may be controlled by closed or open loop control of the force transducers. Parches dolor de espalda . In embodiments where the force transducer comprises one or more conduits, the dynamic response of the deformable body may be variable by active control of the fluid in at least one conduit. At least part of the deformable body may be adapted to be deformed by the effect of fluid motion. By having a power take-off apparatus indirectly driven via a secondary fluid located within the conduits, rather than using the fluid flowing in the cavity of the distensible tube 24, more freedom in the location of the power take-off apparatus may be obtained.
- Reacción alérgica a las plantas de la familia de las ranunculáceas
- Genumedi® Vendaje de rodilla
- Fiebre Tifoidea
- Cansancio e irritabilidad
- No utilices la maquinilla ni la depiladora eléctrica en la ducha
The fluid cavity may be open to ambient fluid, and thus ambient fluid may communicated to and from the fluid cavity. The conduit may be at least partially formed from a resiliently elastic material. This panel construction could be fabricated using existing techniques developed for the thin film coatings, and details such as the through connections between alternate electrodes achieved using photolithographic application of masks followed by subsequent etching of dielectric and back filling with the required dielectric or electrode material. The body may comprise an electroactive material adapted to generate an electrical current upon deformation thereof. The two embodiments operate in analogous fashion, with the first embodiment using deformation of an electroactive polymer by fluid motion induced by waves to drive a electrical charge whilst the second embodiment uses deformation of conduits by fluid motion induced by waves to drive a fluid in the conduits.