The selection of the mass or spring coefficient or both to adjust the natural frequency of the device is referred to herein as “tuning”. That is, the natural frequency of the device may be tuned by selection of the mass or the spring coefficient or both. According to the present invention, an acoustic jet directed at a low angle of incidence into the boundary layer of a turbulent gaseous flow provides pulses of high momentum flux particles, which are essentially the previously ingested low momentum flux particles that have been accelerated, injected substantially tangentially into the boundary layer to cause, in the region downstream of the tangential acoustic jet, an essentially steady streamline flow with the boundary layer absolutely attached to the surface. In addition, the most effective frequency for the tangential acoustic jet of the present invention corresponds to a frequency where particle displacement in the nozzle is the largest, relating to acoustic streaming parameters, and occurs at low frequencies where the actuator output is designed to be maximal; this is in contrast to the dynamic separation control of the prior art (hereinbefore) in which the frequency directly depends on flow speed, length of separation, and approaching boundary layer characteristics.
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2C, making the boundary layer resistant to separation during both strokes, thereby completely preventing separation. The wave energy captures the kinetic energy of the motion of waves, converts the wave energy into usable electrical energy to power the signaling mechanism to enable the person attached to the floatation device to be located in a body of water during an emergency. In Fig. 2E, the dotted line illustrates the streamwise velocity of particles as a function of distance from the wall during the negative pressure or instroke portion of the cycle (as in Fig. FIG. 4B is a perspective view of another illustrative embodiment of the wave energy generator. According to certain illustrative embodiments, the damping of the energy from the mass comprises less than critical damping.
The electrical energy generator generally comprises a housing, an induction coil, an electromagnetically active mass movable in a reciprocating manner relative to the housing, and at least one spring engaging the electromagnetically active mass to the housing. According to other illustrative embodiments, the electrical energy generator comprises a housing, an induction coil, an electromagnetically active mass movable in a reciprocating manner relative to the housing, a first spring engaged with the mass and the housing, and a second spring engaged with the mass and the housing, and means of mitigating motion retardation of the electromagnetically active mass within the housing. One illustrative method of moving the point of engagement between the spring and the threaded member with respect to the housing is by advancement or retraction of the threaded member by rotating the threaded member with respect to the threaded receiver. Dolor lumbar que se extiende al abdomen . According to the illustrative embodiments shown in FIGS 3-5, the housing of the linear electrical energy generator is fixed within the float of the wave energy generator.
The time average streamwise velocity as a distance from the wall is shown in Fig. Fig. 1B is a stylized, side section view of an airfoil, with forcing of the prior art, illustrating vortical structures and unsteady flow adjacent to the suction surface thereof. 2, the device (210) comprises a housing (220) which comprises an elongated circular cross-section tube having a first and second ends. Electromagnetically active masses capable of bending the flux lines of a magnetic field may also comprise materials having magnetic permeability. An electromagnetically active mass is capable of producing a magnetic field or bending the flux lines of a magnetic field.
The electrical energy generator may comprise one or more electromagnetically active components to affect a desired magnetic field. The sealing of the generator within the housing protects it from the environmental elements. Sealing the generator also permits a vacuum to be pulled inside the sealed housing, or permits the containment of a gas within the housing to mitigate motion retardation of the electromagentically active mass. In certain embodiments, the electrical energy generator comprises an electromagnetically active shroud that is engaged with the housing which at least partially covers said housing.
In embodiments in which the electromagnetically active mass comprises an unmagnetized material having magnetic permeability, the device will further comprise an electromagnetically active shroud which comprises a permanent magnet. In certain embodiments in which the electromagnetically active mass comprises a permanent magnet, the device comprises an electromagnetically active shroud comprising an unmagnetized material having magnetic permeability. Electromagnetically active masses capable of producing a magnetic field comprise permanent magnets, electromagnets and the like. The amount of movement will be equal to the product of the thread pitch and the number of rotations made.
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There will exist a coefficient of friction determined by the material of the guidance surface and the material of the electromagnetically active mass which contacts the material of the guidance surface. The product of the coefficient of friction and the normal forces defines the magnitude of friction forces between the mass and the means which retard the motion of the mass. Resfriado y dolor de espalda . One means of mitigating motion retardation by pressure differentials is by the inclusion of apertures, flow-paths, flutes, or ducts to permit flow from the region into which the mass is moving and to the region from which the mass is moving. One type of retardation of the motion of the electromagnetically active mass is by viscous effects.