102 results about "Natural resonance" patented technology

An electric device which removes supragingival and sub-gingival plaque and undesirable debris from the interproximal surfaces between teeth is described. This device utilizes a combination of sonic energy and dental floss which is secured between two tines, the tines being part of a flexible fork which is removable from a powered handle which contains batteries and an electric motor. The electric motor, which is coupled to an eccentrically mounted disc on an output shaft, revolves at sonic frequencies which in turn generates sonic energy that is transmitted to the flexible fork which holds the floss. The sonic energy is synchronized and in tune with the natural resonance frequencies of the fork thereby stimulating the resonance action of oscillating vertical and / or elliptical movement of the fork which in turn imparts cleaning energy to and enhances the cleaning properties of the floss. The flexible fork may be removed from the handle and replaced with other dental cleaning tools such as a brush, a pick, and / or a tray attachment.

A toothbrush provides a head with bristles, a neck and a handle. An eccentrically rotational weight is engaged for rotation with a motor, the weight disposed within the head. The motor is disposed within the handle. The head and neck are integrally formed with a natural resonance frequency of vibration approximately equal to the rotational speed of the motor and synchronized therewith.

The disclosed device includes core control module, excitation module and data acquisition and control module. The data acquisition and control module includes vibration sensor, charge amplifier and data acquisition unit connected to each other through circuits. The excitation module includes constant current source in frequency conversion and excitation transformer. Through analyzing change of natural resonance frequency curve of transformer winding, the disclosed device detects loosening status of winding, providing very high detection sensitivity.

The invention relates to a blade (10) of a rotor of a second phase of a compressor, which can be defined by coordinates of a discreet combination of points, in a Cartesian reference system (X, Y, Z), wherein the axis (Z) is a radial axis intersecting the central axis of the compressor, said blade (10) having a profile which can be identified by means of a series of closed intersection curves between the profile itself and planes (X, Y) lying at distances (Z) from the central axis, said blade (10) also comprising a thickening (30), substantially parallel to a base portion (12) of the blade (10) itself, fixable to said rotor, said thickening (30) being substantially situated midway up the blade (10) and being suitable for shifting the natural resonance frequencies of the blade (10) itself outside a functioning velocity range of said rotor.

The invention discloses a layered MXene loaded cobalt ferrite composite wave-absorbing material. The cobalt ferrite of the composite wave-absorbing material is loaded between layers of layered MXene, and the mass ratio of the cobalt ferrite to the layered MXene is 1: (1-3), wherein the MXene has a unique lamellar microstructure, and the surface of the MXene is rich in functional groups, so that the cobalt ferrite can be loaded between layers or on the surface of the MXene to form a dielectric-magnetic two-phase heterojunction microstructure, and the MXene has a remarkable dielectric polarization loss characteristic; the nano magnetic cobalt ferrite loaded on the MXene has a high-frequency natural resonance effect and a strong magnetic loss mechanism, and the high resistivity of the nano magnetic cobalt ferrite can weaken the strong reflection effect of the MXene on incident electromagnetic waves, so that the composite material is more beneficial to impedance matching with space; therefore, the composite material shows a broadband strong electromagnetic wave absorption characteristic, and a reflectivity result shows that the bandwidth of the composite material is superior to -10dB (90% absorption rate) and reaches 7.2 GHz, and a corresponding absorption peak reaches -21.75 dB.

Disclosed is a resonant device applied in vibration test. The device comprises an additive working table fixed on the surface of a vibration table or a bounce table. The main body of the additive working table is a rigid table, which top surface is the additive table for setting testing component; around the bottom of the table are equipped with mounting pads, the middle part of the table is hung in the air relative to the mounting pad plane; the natural first resonance frequency or multiple resonance frequency of the rigid table is greater than the natural resonance frequency of the vibration table or the bounce table. The invention has the advantages that it can improve the range of testing frequency by installing resonance device.

An electromechanical resonator produced on a substrate, and a method of producing thereof, including: a suspended structure produced at least partly from the substrate, configured to have a vibration imparted to it such that it resonates at least one natural resonance frequency of the suspended structure; an anchor structure to anchor the suspended structure, by at least one area of its periphery, to the remainder of the substrate, and dimensioned to resonate at the resonance frequency; a mechanism to excite the suspended structure, to cause it to vibrate at the resonance frequency; and a mechanism to detect the vibration frequency of the suspended structure.

A microphone package wherein an MEMS microphone chip (MIC) is mounted on a substrate (SUB) and is sealed with a cover (ABD) with respect to the substrate. The membrane (MMB) of the microphone chip is connected to a sound entry opening (SEO) in the substrate via an acoustic channel. As a result of defined dimensioning of, in particular, the cross section and length of sound entry opening and channel, an acoustic low-pass filter is formed, the −3 dB attenuation point of which is significantly below the natural resonance of microphone membrane and package.

A small footprint dipole antenna of the invention for WLAN applications is designed for full natural resonance in a single band, e.g., the 2.4 GHz band, and uses a matching network to for artificial resonance at a second band, e.g., the 5 GHz band. The natural impedance of the dipole in second band is set in a range that produces an efficient antenna with substantial range in both of the first and second bands.

An improved sensor apparatus for developing a signal related to an inductive sensor in a resonant circuit are disclosed. This improvement is realized by adding a known capacitance to the resonant circuit and comparing the resulting natural resonance frequency to the frequency without the known capacitance. In this way a measure of the resonant capacitance is developed to correct the sensor signal for the effect of any changes in that capacitance. One disclosed embodiment adds an electronically variable capacitance which is adjusted to yield a constant capacitance that produces a sensor signal insensitive to variations in the resonant circuit capacitance. The resonant capacitance measurement may also provide an indication of another sensor state, such as temperature or pressure, which may be used to further correct for temperature or pressure sensitivities in the sensor signal. The invention is extended by juxtaposing the inductance for capacitance in the sensor resonant circuit.

A system for measurement of environmental parameters, using an optomechanical cavity in the end of an optical fiber. A single unmodulated CW laser excites the cavity, which has one reflective element fixed within the end of the fiber and the facing reflector being the surface of a mechanical element, supported over the cavity at the end of the fiber so that it can vibrate at its natural resonance frequency. The length of the cavity “vibrates” at the same frequency as the mechanical element, so that the light reflected from the cavity is modulated at that same frequency, and can be readily measured. The resonant frequency of the mechanical element is responsive to the environmental parameter to be measured, either by direct influence on the vibration of the mechanical element, or by means of the element's temperature change as a result of exposure to the environmental parameter.

Combination of machinery and processes in the field of compound, segmented floating platform apparatus for oceanic wave power conversion consisting of a buoyant semi-submersible segment pivotally joined to an Interlinking Segment with their relative movement restricted to oscillate in one or more planes, wherein the buoyant semi-submersible segment provides means for controlled, graduated altered pitch of its main axis' facing direction between horizontal and vertical orientations. The addition, subtraction, redistribution or linear acceleration along the primary axis of components of varying relative specific gravity cause the submersible end to rise, reorienting the facing angle. Preferred embodiments include reorienting segments joined serially or radially and interlinked to second elements, and extensible lengthwise for adjusting natural resonance. Methods are disclosed for reorienting, trimming and harmonic tuning both of single apparatus and in arrays, so as essentially to compose a multitier distributed information system controlled in automatic, command, and neural network modes.

The invention relates to a method for designing resonance parameters of a resonant converter for an electrodeless lamp. The high-frequency LCCL resonant converter is composed of a half-bridge inverter circuit, a series-parallel resonant loop and a coupling coil, wherein the half-bridge inverter circuit is composed of a switch tube Q1 and a switch tube Q2, the series-parallel resonant loop is composed of a resonant inductor Lr, a resonant capacitor Cr, a blocking capacitor Cb and an excitation inductor Lc, and the coupling coil is composed of the excitation inductor Lc and an electrodeless lamp tube plasma discharging ring. After values of the Cb and the Lc are determined, the resonant parameters Lr and Cr are determined through a formula. In the formula, Leq and Req express an equivalent inductor and an equivalent resistor of the coupling ring auxiliary edge lamp tube plasma discharging ring mapped to the original edge, f expresses the work frequency of the resonant converter, and fo expresses the natural resonance frequency of the resonant loop. According to the method, it can be guaranteed that when the natural resonance frequency of the circuit is changed, ZVS soft switching of the electrodeless lamp can be still achieved, and the maximum power is output.

An apparatus and method for noninvasively monitoring steam quality and flow and in pipes or conduits bearing flowing steam, are described. By measuring the acoustic vibrations generated in steam-carrying conduits by the flowing steam either by direct contact with the pipe or remotely thereto, converting the measured acoustic vibrations into a frequency spectrum characteristic of the natural resonance vibrations of the pipe, and monitoring the amplitude and / or the frequency of one or more chosen resonance frequencies, changes in the steam quality in the pipe are determined. The steam flow rate and the steam quality are inversely related, and changes in the steam flow rate are calculated from changes in the steam quality once suitable calibration curves are obtained.

An antenna includes a radiating ring element formed as a spherical sector or about a one-half wavelength circumference in natural resonance for obtaining uniform current distribution and enhancing the gain relative to the size of the antenna. A capacitive element, such as a gap, can be formed therein for forcing the radiating ring element to resonance. A variometer feeds the radiating ring element and is operative for varying feed impedance.

A drive for oscillating a reflector in a beam scanner, and for other similar oscillating devices, forms a feedback loop synchronized to the natural resonance of a resiliently movable flipper strip carrying the reflector. A magnet on the free end of the flipper generates a current in a sensing coil coupled to an amplifier upon passage of the magnet. The triggering signal is phase delayed by one or more integrators or timers, whereupon a driving current is generated, for example in a different winding on the same spool as the sensing coil. The driving current is applied at a phase delay that maintains oscillation up to a high operational frequency in a range. Synchronizing the drive to the natural frequency and phase of the flipper substantially reduces power consumption compared to forcing oscillation to a different reference.

The invention discloses an FeCo@MXene core-shell structure composite wave-absorbing material and a preparation method thereof. The material is a core-shell structure formed by coating flake-like MXene with a magnetic FeCo nano-particle, and the mass ratio of the FeCo nano-particle to the MXene is 1 to (2-4); wherein the MXene has a flake-like microstructure, the surface is rich in functional groups, and is capable of enabling the FeCo to be coated on the surface of the MXene to form a microcosmic core-shell structure of a dielectric-magnetic two-phase heterojunction which has remarkable dielectric polarization loss characteristics; meanwhile, the FeCo coated on the surface of the MXene not only has high frequency natural resonance effect and strong magnetic loss mechanism, but also balances a difference between a complex dielectric frequency spectrum and a complex permeability frequency spectrum of the composite material, which is beneficial to the matching with space impedance; therefore, the material exhibits wideband and strong electromagnetic wave absorption characteristics, and a reflectivity result indicates that the material is superior to the bandwidth -10dB by 8.8 GHz.

A position-error-signal calculation circuit (105) calculates a relative position error between a laser-focused-beam spot (103) and an information recording layer (102), and generates a focus error signal (106). A filter (108) amplifies and passes therethrough a signal component in the vicinity of the natural resonance frequency of at least one mode among the natural vibration modes of the optical disc medium (101). A drive amplifier receives through a stabilizing compensator (109) and a D / A converter (110) the focus error signal (106) passed by the filter (108), to drive an objective lens (113), thereby allowing the laser-focused-beam spot (103) to track the information recording layer (102).

A method which allows especially the extrapolation of the measured value at the upper and lower end of a measuring range where normally no direct measurement range where normally no direct measurement is possible by superposition of interfering signals, for example by reflection on a radar antenna. In the presence of strong interference signals, for example by reflection of a radar antenna. In the presence of strong interference signals, which are for example caused by the natural resonance of the container or neck in which the measuring device is mounted, the direct level indicator signal can be regularly used if it has a high amplitude caused by a superposition with the interfering signal lies between two interfering signals and does not extend beyond these, the level indicator value can be interpolated by the shift of the signals from the point of reflection. The inventive method automatically adapts itself to a prevailing measuring situation while according to known methods for the user has to decide between a measurement via a shift of EOL signal or a measurement via the direct level indicator echo.

A sound insulation structure having one or more sound insulation cells, wherein: each of the one or more sound insulation cells is provided with a frame having through holes, a film affixed to the frame, and an opening part formed from one or more holes penetrating the film; both end parts of the through holes in the frame are not closed; and the sound insulation structure has, on the low-frequency side of a first natural resonance frequency for the film of the one or more sound insulation cells, a masking peak frequency that is determined due to the opening parts of the one or more sound insulation cells and for which transmission loss is maximum, and selectively insulates sound of a fixed frequency band centered on the peak masking frequency. Thus, it is possible to provide a sound insulating structure that is lightweight and thin, is not dependent on the position and shape of holes, has high robustness as an acoustic insulator, has stability, has air permeability, does not retain heat, and has excellent manufacturing suitability, and a manufacturing method for the sound insulating structure.

A cover or housing member for an electronic device comprises a central region and a perimeter region surrounding the central region. The central region comprises an elevated pattern of radial ribs and elliptical elevations elevated above a generally planar lower surface, such that the cover has multiple vibrational modes of natural resonance in which a maximum deflection of the cover occurs in a first mode at a central point of the cover.

The invention discloses a chipless radio frequency identification (RFID) electronic tag based on pole identification. The chipless RFID electronic tag based on the pole identification is composed of a plurality of folded dipole basic resonance units with different physical sizes, and each basic resonance unit is capable of generating unique resonance characteristics in a specific frequency range. Tag structures with different data codes can be acquired through combination of all the resonance units with different lengths, widths and folded position-center distances. When detecting is carried out, ultra wide band (UWB) impulse pulsed electromagnetic wave is used for a drive signal, and a singularity expansion method (SEM) based on stag scattered signals is adopted to acquire pole parameters which correspond with stag structure parameters. Identity data with the stags are distributed on complex frequency (poles) related to natural resonance, and then identification of the chipless RFID electronic tag can be achieved through a specific coding and decoding method.

The invention discloses a magnetic coupling resonant radio energy transmission structure based on a passive LC resonance coil. Multiple stages of resonance coils are introduced between a sending coiland a load coil, that is, a capacitor series compensating resonance structure, wherein the first stage of sending coil is connected to a high-frequency power supply; the introduced second stage of resonance coil serves as a source coil to receive and store the energy transmitted from the sending coil, and transmits the energy to the next stage; and the introduced (n-1)th stage of resonance coil serves as a driving coil to receive the energy transmitted from the previous stage, and meanwhile, is connected to the load for load consumption, and transmits the last stage of load coil. The same resonance coils are introduced to connect with the capacitor to form an LC resonance structure, the natural resonance frequency of which is same with the driving end excitation frequency. Through coupling units for radio energy transmission, radio energy transmission distance and angle are greatly improved while good transmission efficiency is ensured.