57 results about "Induced oscillations" patented technology

An electrical generator including a magnetic field generator and at least one energy converter for converting energy present in fluid flows into vibrations or oscillations. The converter includes a flexible membrane having at least two fixed ends. The membrane vibrates when subject to a fluid flow. One of the electrical conductor and the magnetic field generator is attached to the membrane and configured to move with the membrane. The vibration of the membrane caused by the fluid flow causes a relative movement between the electrical conductor and the applied magnetic field. The relative movement causes a change in the strength of the magnetic field applied to the electrical conductor, and the change in the strength of the magnetic field applied to the electrical conductor induces a current flowing in the conductor.

An imaging system includes an image detector for producing a continuous image signal from an image received thereat; oscillation means coupled to the image detector for inducing a spatial oscillation in the image relative to the image detector; and a spatio-temporally matching filter in communication with the image detector and the oscillation means. The matching filter is configured to filter out aspects of the image signal not associated with the induced oscillation, to thereby provide enhanced image processing of the image.

Methods, systems, and related computer program products for are described for non-invasive detection of intracranial pressure (ICP) variations in an intracranial compartment of a patient. Optical radiation is propagated transcranially into the intracranial compartment, and optical radiation that has migrated through at least a portion of the intracranial compartment and back out of the cranium is detected. At least one signal representative of the detected optical radiation is processed to extract therefrom at least one component signal that varies in time according to at least one of an intrinsic physiological oscillation and an externally driven oscillation in the patient. Examples of suitable intrinsic physiological oscillations include intrinsic respiratory and cardiac oscillations. Examples of suitable externally driven oscillations include ventilated respiratory oscillations and externally mechanically induced oscillations. The extracted component signal is then processed to generate an output signal representative of the ICP variations in the intracranial compartment.

An electrical generator including a magnetic field generator and at least one energy converter for converting energy present in fluid flows into vibrations or oscillations. The converter includes a flexible membrane having at least two fixed ends. The membrane vibrates when subject to a fluid flow. One of the electrical conductor and the magnetic field generator is attached to the membrane and configured to move with the membrane. The vibration of the membrane caused by the fluid flow causes a relative movement between the electrical conductor and the applied magnetic field. The relative movement causes a change in the strength of the magnetic field applied to the electrical conductor, and the change in the strength of the magnetic field applied to the electrical conductor induces a current flowing in the conductor.

An ellipsometer includes a light source for generating a probe beam of polychromatic light for interacting with a sample. The probe beam is passed through a first polarizer that imparts a known polarization state to the probe beam. The polarized probe beam is then directed to reflect from the sample. A second illumination source is switched on and off at a predetermined frequency to create an intensity modulated pump beam (the beam may also be chopped). The pump beam is directed normally against the subject producing a small illumination spot within the area illuminated by the probe beam. The pump induces localized changes in the dielectric properties of the subject. The pump-beam induced oscillations are picked up by the portion of the probe beam that is reflected from within the illumination spot of the pump beam. By analyzing only the portion of the reflected probe beam that includes the pump beam induced oscillation, the size of the measurement spot is effectively limited to the illumination spot size of the normally directed pump beam.

A plant eradication device, the driving shaft (12) of which comprises a slender shaft main part (21) made of titanium alloy, and a shaft end made of steel and integrally connected with the opposite end of the shaft main part (21) part (22,26). Titanium alloys have substantially the same mechanical strength as steel. Therefore, the shaft main part (21) made of titanium alloy can ensure the rigidity required by the general plant removal machine, and can reduce the weight of the drive shaft, thereby reducing the undesired droop-induced vibration caused by the self-weight of the shaft .

A system for controlling manual input device damping, and a related method and computer program product are disclosed. The system may comprise a manual input device mounted on a machine, a sensor that transmits to a controller an input signal indicative of the motion, acceleration, and / or deceleration of the machine, a variable damper that selectively alters the resistance of the input device to displacement based on a command signal transmitted by the controller, and a controller configured to adjust the resistance of the input device by adjusting the damping provided by the variable damper based on filtering of a historical trend of oscillation amplitudes at a frequency of concern.

An imaging system includes an image detector for producing a continuous image signal from an image received thereat; oscillation means coupled to the image detector for inducing a spatial oscillation in the image relative to the image detector; and a spatio-temporally matching filter in communication with the image detector and the oscillation means. The matching filter is configured to filter out aspects of the image signal not associated with the induced oscillation, to thereby provide enhanced image processing of the image.

Certain embodiments are directed to devices, systems and methods for determining a penetration depth of an induced oscillation in a porous medium. In certain examples, the devices, systems and methods are designed to detect a magnetic resonance signal in the presence of an induced oscillatory fluid flow in a porous medium to determine penetration depth of the induced oscillation in the porous medium. In some examples, the mobility of a fluid in the porous medium may be determined from the determined penetration depth.

A facility, comprising systems and methods, for providing enhanced situational awareness to captured image data is disclosed. The disclosed techniques are used in conjunction with image data, such as a real-time or near real-time image stream captured by a camera attached to an unmanned system, previously captured image data, rendered image data, etc. The facility enhances situational awareness by projecting overlays onto captured video data or "wrapping" captured image data with previously-captured and / or "synthetic world" information, such as satellite images, computer-generated images, wire models, textured surfaces, and so on. The facility also provides enhanced zoom techniques that allow a user to quickly zoom in on an object or area of interest using a combined optical and digital zoom technique. Additionally, the facility provides a digital lead indicator designed to reduce operator-induced oscillations in commanding an image capturing device.

A dampener mount for an axle to absorb / dampen / inhibit power-hop induced oscillations in a rear axle assembly. A housing for the axle assembly incorporates a mount for attaching a shock absorber / dampener which is in turn connected to the unsparing mass of a vehicle. Preferably the shock absorber / dampener is secured to a bracket connected or otherwise formed with the housing cover.

The invention belongs to the technical field of control over vibration noise and particularly relates to a device for controlling underwater noise. The technical scheme of a device for suppressing flow-induced oscillation line-spectrum noise of an underwater cavity is that when a solenoid is electrified, a driving film does cyclical movement in a hydraulic cylinder under the action of an electromagnetic force, and converts inputted electric energy into kinetic energy for film movement; when the driving film expands, the pressure in the hydraulic cylinder is reduced, and external fluid is sucked into the cavity through a slit; and when the driving film shrinks, the pressure in the hydraulic cylinder is increased, and the fluid in the hydraulic cylinder is drained out of the cavity, thereby generating unsteady jet flow at the slit of a top cover. By utilization of mutual action of vortex generated by pulsating jet and a shear layer, jet flow and an open pore enter the shear layer for generating a strong effect and damaging self-sustained oscillation of the shear layer, thereby realizing the suppression on the flow-induced oscillation line-spectrum noise.

The present invention discloses a device for administering intermittent pneumatic compression (IPC) and Protocols of Artificially Induced Oscillations (PAIO) useful in alleviating peripheral circulatory disorders of a treated organ, comprising a wearable body portion enclosure (BPE) adapted to contact said treated organ, said BPE comprising: one or more balloons adapted to be inflated and deflated for creating said IPC; one or more pressure sources in fluid communication with said balloons by way of one or more valves; one or more vibrating elements adapted to produce PAIO; a controlling unit adapted to operate said pressure sources, and to operate said vibrating elements. The IPC and PAIO may be individually administered to said treated organ according to predetermined protocols.

This invention relates to methods and devices for the detection and characterization of psychoactive compounds by analyzing alterations of network level physiological characteristics before and after the introduction of a candidate sample onto an in vitro neuronal tissue sample. The invention further provides a software package that enables an operator to deliver a timed electrical pulse to neuronal samples at a specific point in their spontaneous or induced oscillations. Such temporal stimulations trigger unexpected and useful network level physiological responses.

An arrangement to control vibrations in a gas turbine exhaust diffuser is provided. The arrangement includes a protrusion coupled to a turbine exhaust cylinder strut for controlling shock induced oscillations in a gas turbine diffuser. The controlled shock induced oscillations minimize pressure fluctuations in the gas turbine exhaust diffuser such that an unsteadiness of the fluid flow surrounding the turbine exhaust cylinder strut is reduced. A method to fluid flow induced vibrations in a gas turbine diffuser is also provided.

A device and method utilizing a quasi-stationary oscillating process to generate electricity by using an interaction between a turbulent flow and an elastic oscillating structure comprising a conductor in the presence of a magnetic field, followed by rectification of thus generated electromotive force, and a combination of similar independent multiple oscillating structures into a connected grid. An arbitrary number of adjustable generating cells can be connected into a single circuit, either in-series or in-parallel, to increase an overall power output. The disclosure is capable to operate under wide range of flow characteristics and can serve as a source of renewable power.

The invention discloses a testing device for simulating bidirectional self-induced vibration of deep-sea stand columns under inclined uniform flow. The testing device obtains velocity and stress of a cylinder body through measuring, obtains actual motion response signals under the effect of water flow by solving a motion equation of the cylinder body and exerts the actual motion signals onto models through a servo motor to enable the models to move, so that self-oscillation motion is simulated. During test, a horizontally sliding module is used for simulating flow and vortex-induced oscillation in the horizontal direction, and a vertically sliding module is used for simulating vortex-induced vibration in the vertical direction. The device sets parameters to simulate model structure performance, avoids messy testing operations in a traditional self-oscillation device, accelerates testing progress, provides large freedom degree for selection of parameters of a vibration system, simulates vortex-induced vibration bidirectionally and synchronously, simulates special working conditions of inclined flow, adopts large-scale stand column subsection to reduce scale effect, and adopts an end prosthesis device to solve the problem of model boundary effect.

The invention relates to a research method of an ocean deep-water floating buoy platform, and particularly relates to a flow-induced oscillation analysis method of a deep-water floating buoy platform. In the vortex-excited oscillation and self-excited oscillation generated by vortex discharge are simultaneously considered, the different properties of pulse towing forces in vortex discharge locking region and non-locking region are also considered, specific calculation steps for flow-induced oscillation analysis of the floating buoy platform based on a mathematical model are provided, and the theory and numerical analysis method for the research of the flow-induced oscillation of the floating buoy platform are perfected.

The disclosure relates to monitoring of MEMS mirror properties. Systems and methods are provided for monitoring properties of a microelectromechanical systems (MEMS) oscillating structure. A system includes a MEMS oscillating structure configured as a non-linear resonator to oscillate about a rotation axis; a driver configured to generate a driving force for driving the MEMS oscillating structureabout the rotation axis according to an operating response curve during which the MEMS oscillating structure is in resonance, the driver further configured to decrease the driving force when the MEMSoscillating structure is at a predefined tilt angle to induce an oscillation decay of the MEMS oscillating structure; a measurement circuit configured to measure an oscillation frequency and a tilt angle amplitude of the MEMS oscillating structure during a decay period; and processing circuitry configured to determine at least one characteristic of the MEMS oscillating structure based on at leastone of the measured oscillation frequency and the measured tilt angle amplitude.

The invention discloses an analysis method for translation-torsion coupling wind induced oscillation response of a non-coaxial rigidity eccentric structure. The method is operated through the following steps of: 1, representing rigidity eccentricity of each layer of the structure in the form of polar coordinate; 2, constructing a power equation of the non-coaxial rigidity eccentric structure; 3, selecting a structural model and determining a model parameter; 4, performing wind induced translation-torsion coupling response analysis on the non-coaxial quality eccentric structure in a frequency domain; and 5, calculating an arithmetic root mean square matrix of displacement and acceleration of the structure, and analyzing data to obtain main influence of mono-axial rigidity eccentricity and non-coaxial rigidity eccentricity on the translation-torsion wind induced oscillation of a rectangular building structure. By using the analysis method, the translation-torsion coupling wind induced oscillation response of the rigidity eccentric structure is analyzed in the frequency domain to obtain the arithmetic root mean square data of the central displacement and acceleration of the plane of each layer of the structure; the method has the innovation point that: the non-coaxial eccentricity of the structure is represented by using the polar coordinate; and the method has the advantages that: the eccentric position of the structure can be flexibly set; and the influence rule of the non-coaxial (any) eccentricity on the wind induced oscillation response of the structure can be given.

An imaging system includes an image detector for producing a continuous image signal from an image received thereat; oscillation means coupled to the image detector for inducing a spatial oscillation in the image relative to the image detector; and a spatio-temporally matching filter in communication with the image detector and the oscillation means. The matching filter is configured to filter out aspects of the image signal not associated with the induced oscillation, to thereby provide enhanced image processing of the image.

A wearing hook for hearing devices has at least one device disposed in a sound channel of the wearing hook. The device is able to influence interfering sound-induced oscillations of the wearing hook. The device is for instance a tube made of metal. An associated method is likewise described for influencing the oscillations.

The invention provides a flat dual self-supporting lightning surge-preventing mini coaxial compound cable for satellite television. The mini coaxial compound cable comprises a cable core and a cable core sheath; dual self-supporting ground wires and a coaxial cable are mounted in the cable wire; the two ground wires are symmetrically arranged on the two sides of the coaxial cable; the coaxial cable comprises an inner conductor, an insulating layer, an aluminum foil shielding layer and a braided shielding layer, all of which are orderly arranged in the radial direction from inside to outside; the cable core sheath is of a flat structure. According to the flat dual self-supporting lightning surge-preventing mini coaxial compound cable for satellite television, the self-supporting ground wires are made of high-performance copper-clad steel having the tensile strength of greater than 800Mpa and the ductility of greater than 5%, and therefore, the cable is enabled to have excellent resistance to bending and wind induced oscillation resistance. The properties of the cable can be protected against damage caused by swaying under wind force as the cable is placed outdoors for a long time; the dual self-supporting ground wires are adopted and symmetrically distributed on both sides of the coaxial cable, and consequently, the whole cable has excellent balanced capacitance to the ground; the influence of strong electromagnetic interference such as lightning surge can be effectively prevented, and therefore, the mini coaxial compound cable has an excellent electromagnetic shielding property.

Systems and methods for operating a turbine engine having a plurality of fuel injectors arranged circumferentially in a combustor, with each fuel injector having a main fuel supply and a pilot fuel supply, includes supplying fuel to the plurality of fuel injectors through the main fuel supply to create a circumferential thermal gradient in the combustor.

The invention relates to a research method of a marine deep-water buoy platform and specifically, in particular to a self-excited oscillation analysis method of a deep-water buoy platform. According to the self-excited oscillation analysis method, a self-excited oscillation concept of the deep-water buoy platform is provided and an analysis model of the self-excited oscillation of the deep-water buoy platform is established, therefore the problems of self-excited oscillation theoretical analysis and a numerical simulation research method of the deep-water buoy platform are further solved, and a theory and a research method of flow-induced oscillation of the deep-water buoy platform are further perfected.