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54 results about "Resonance damping" patented technology
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A resonance damping coupling, or resonant coupling, is a rotational power transmission device that is specially engineered to combat vibration and resonance between two joined shafts. Their design and construction combine to effectively suppress the resonance phenomenon that can plague these motors, particularly at higher operating speeds.
Active damping method of LCL grid-connected inverter system and circuit for realizing active damping method
InactiveCN102522879AInhibition effectAc-dc conversionHarmonic reduction arrangementGrid connected inverterState variable
The invention relates to an active damping method of an LCL grid-connected inverter system. The active damping method is realized through the following steps of: setting conjugated zero points or independent zero points to set off conjugated resonance limit points generated by an LCL filter in the grid-connected inverter system or to draw the conjugated resonance limit points to a stable area, and adopting grid-side inductive current to feed back and introduce a state variable in the LCL filter to conduct feedback compensation. By conducting feedback compensation on grid-side inductive voltage, the resonance damping of the LCL filter is controlled, the waveform and the amplitude of grid current of the grid-connected inverter system are controlled and the influence of grid voltage harmonic wave on the grid current can be effectively suppressed. The active damping method is a simple and effective realization method. A realization circuit comprises parallel and series active damping circuits.
Owner:SOUTHEAST UNIV
Abating low-frequency noise using encapsulated gas bubbles
InactiveUS20130001010A1Optimize allocationThe relative position is appropriateExhaust apparatusSilencing apparatusUltrasound attenuationSound sources
Air bubbles may be used to reduce radiated underwater noise. Two modalities of sound attenuation by air bubbles were shown to provide a reduction in radiated sound: bubble acoustic resonance damping and acoustic impedance mismatching. The bubbles used for acoustic resonance damping were manifested using gas-filled containers coupled to a support, and the acoustic impedance mismatching bubbles were created using a cloud of freely-rising bubbles, which were both used to surround an underwater sound source.
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST
Method for damping vibrations and a method for mounting the device
InactiveUS7246797B2Easy to assembleEasy to producePortable framesNon-rotating vibration suppressionEngineeringResonance damping
Device for damping vibrations of a vibration surface (21) of the frequency tuned resonance damping kind consisting of one or several elastic damping elements (1–4) and a vibration body (5) supported by the damping elements which together are tuned to damp the vibrations of said surface within a selected frequency range. First mutually co-operating form grip organs give a form grip between said damping elements (1–4) and the vibration surface (21) and second mutually co-operating form grip organs give a form grip between the damping elements and the vibration body. The form grip organs in addition have a recess with gripping surfaces (25–30, 33–35) for transferring vibrations.
Owner:TRELLEBORG AUTOMOTIVE FORSHEDA
Resonance damping material produced by using waste rubber
InactiveCN102924832AImprove high temperature resistanceImprove water resistanceIron powderWaste rubber
The invention provides a resonance damping material produced by using waste rubber, which comprises the following raw materials in percentage by weight: 5 to 20% of butyl rubber, 2 to 15% of reclaimed butyl rubber, 5 to 20% of rubber oil, 2 to 15% of isobutene, 1 to 10% of white carbon black, 0.1 to 5% of carbon black, and 50 to 80% of powdered iron. The resonance damping material produced by using waste rubber can well resist high temperature because of reasonable selection and ratio of raw materials. Tests prove that the damping material can run for a regular time at a high temperature of 150 DEG. In addition, the damping material obtained by the invention has high waterproof performance and high adhesive strength as well as strong shock and noise absorbing performance.
Owner:GUANGDE TIANYUN NEW TECH
Vehicle exhaust system with resonance damping
Owner:FAURECIA EMISSIONS CONTROL TECH GERMANY
LCL type grid-connected inverter without resonance damping and integrated design method thereof
InactiveCN102761138ASimplify the design processLow costAc-dc conversionSingle network parallel feeding arrangementsUltrasound attenuationGrid connected inverter
Owner:CIXI YUSHI COMM ELECTRIC POWER EQUIPCO
Method and system for resonance dampening in wind turbines
A resonance damping system for a wind turbine having a generator connected to a power grid, the resonance damping system comprising an adaptive resonance damper, operable to provide a control signal for the generator, wherein the variable torque signal of the adaptive resonance damper is automatically adjusted according to a parameter which represents a grid condition.
Owner:GENERAL ELECTRIC CO
Vibration-shock absorbing mechanism and content reproducing apparatus
A vibration-shock absorbing mechanism that protects an object disposed in a housing includes a shock-absorbing member that is disposed in the housing and absorbs a shock, and a resonance-damping member that is disposed between the object and the shock-absorbing member and dampens a vibration and shock in a predetermined frequency range including a resonant frequency of the object.
Owner:SONY CORP
Matrix converter comprising source damping filtering unit, and control method thereof
ActiveCN104113218AReduce harmonic contentReduce THDConversion without intermediate conversion to dcMatrix convertersWave shape
The invention discloses a matrix converter comprising a source damping filtering unit. The matrix converter comprises an input power source, an LC input filtering unit, a switch matrix and a microprocessing unit. Currents provided by the input power source are input to a load successively through the LC input filtering unit and the switch matrix, the microprocessing unit, through control over the resonance damping of an LC filter, controls input current waveforms of the LC filter so as to obtain expected output voltages, and according to the expected output voltages, distributes pulses to each switch tube in the switch matrix to control the work state of each switch tube in the switch matrix. The invention also provides a control method of the matrix converter comprising the source damping filtering unit. The dynamic characteristic is improved, the power supply current harmonic wave content can be reduced, a power supply side is enabled to be always close to a unit power factor, and the efficiency of the matrix converter is improved. At the same time, resonance appearing in the LC filter is effectively inhibited, the total harmonic wave distortion rate of power supply currents is reduced, and the influence exerted by the matrix converter on a power network is decreased.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Resonance-peak-free hydraulic vibration isolator and vibration reducing module thereof
The invention provides a resonance-peak-free hydraulic vibration isolator and a vibration reducing module of the resonance-peak-free hydraulic vibration isolator. The resonance-peak-free hydraulic vibration isolator comprises the vibration reducing module, a damping module and a connecting module. The vibration reducing module comprises a hydraulic limiting vibration reducing device and a main spring. The damping module comprises a waist-drum-shaped damping sleeve, a first damper and a second damper. The connecting module comprises an upper end cover, an upper limiting end cover, a middle cylinder, a lower end cover with a cylindrical protrusion, and a base. According to the resonance-peak-free hydraulic vibration isolator, the implementation structure of the damping module is simple, the structure of the combination between the bi-directional hydraulic vibration reducing device and the double dampers in the damping module can be matched with the waist-drum-shaped damping sleeve to provide stable damping force in the perpendicular direction and the horizontal direction, perpendicular bi-direction limiting can be achieved, a good centering reset effect on transverse vibration is achieved, and the resonance damping effect is good.
Owner:GUANGDONG POLYTECHNIC NORMAL UNIV +1
Virtual impedance comprehensive control method for power inductive filtering system
ActiveCN105932678AStrong resonance damping capabilityReduce dependenceFlexible AC transmissionActive power filteringTransformerSpecial design
The invention discloses a power inductive filtering system and a virtual impedance comprehensive control method therefor. The power inductive filtering system mainly comprises a novel inductive filtering transformer subjected to special design and a filtering branch connected with the novel inductive filtering transformer, wherein the filtering branch comprises a single tuned filter set and harmonic current controlled voltage source inverters connected in series. According to the power inductive filtering system and the virtual impedance comprehensive control method, power grid resonance damping control of the voltage source inverters is organically combined with zero impedance control of filters according to unsolved technical problems in an existing filtering method and existing device manufacturing process difficulties, so that the problem of performance reduction of a passive filtering device caused by impedance parameter change of a power grid system is solved on one hand and the optimization control of a quality factor of the passive filtering device can be realized for reducing the dependence on the level of a device production process on the other hand; and quality factors of the single tuned filters are enabled to meet design requirements, so that the overall filtering characteristics are further improved.
Owner:HUNAN UNIV
Resonance peak free vibration isolator and damping module thereof
ActiveCN106545610AImprove rigidityFacilitate centering resetElastic dampersShock absorbersSnubberEngineering
The invention discloses a resonance peak free vibration isolator and a damping module thereof. The resonance peak free vibration isolator comprises a vibration reduction module, the damping module and a connecting module. The vibration reduction module comprises a hollow hexagon bolt with an internal thread, an adjusting gasket, an internal thread sleeve and a main spring. The damping module comprises a drum type damping sleeve, first dampers and second dampers. The connecting module comprises an upper end cover, a lower end cover, a base and a middle cylinder. The lower end cover is provided with a cylinder type bulge. The drum type damping sleeve is fastened in the inner cavity of the vibration isolator through the hollow hexagon bolt and the adjusting gasket. The two ends of the main spring are respectively propped against the internal thread sleeve and the lower end cover with the cylinder type bulge. The damping module is simple in structure, the two dampers of the damping module are matched with the drum type damping sleeve to provide stable vertical and horizontal damping force, a good centering and resetting effect on horizontal vibration is achieved, and the resonance damping effect is strong.
Owner:GUANGDONG POLYTECHNIC NORMAL UNIV +1
Method and system for resonance dampening in wind turbines
Owner:GENERAL ELECTRIC RENOVABLES ESPANA SL
Layered speaker assembly
InactiveUS20190058954A1Improve audio qualityImprove efficiencyMicrophonesLoudspeaker screensLoudspeakerAcoustic cavity
Devices and methods described herein relate to novel and improved speaker assembly designs that optimize audio quality. Embodiments herein can also facilitate the tuning of audio range by linearizing frequency and amplitude. Some speaker assembly embodiments herein can improve the audio output by alternating layers of rigid and porous material, which can facilitate aperiodic resonance damping. Embodiments herein can also provide a constant audio output and improve the audio directional pattern. Moreover, speaker assemblies herein can improve the overall audio output at all frequencies by eliminating internal acoustic cavity resonance. Embodiments herein can also customize the audio output through tunable or adjustable components, such as modifying the flow resistance, density, thickness, or shape of cabinet layers. This can also shape the directional frequency response and adjust the damping or resonance frequency. Additionally, this adjustability allows assembly designs to be tailored to all different types of speakers.
Owner:BELLAS KIMON
Subsynchronous resonance characteristic value analysis model of multi-machine system
InactiveCN102064557AStability can be judgedJudgment stabilityPower oscillations reduction/preventionElectric generator controlCapacitanceOperating point
The invention discloses characteristic value analysis model and step for the subsynchronous resonance analysis of a multi-machine power system, relating to the field of characteristic value analysis models of the subsynchronous resonance analysis of the power system. The deducing and calculating process of a method comprises the following step of: respectively writing a rotor motion equation of amultimass block model of a shaft system of a steam turbine generator, an electromagnetic transient state equation of a magnetic chain and the voltage of a generator, an electromagnetic transient state equation of a power transmission line, an electromagnetic transient state equation of a series-connected compensation capacitor and a control system equation of an excitation controller and the like. The invention obtains a differential equation set related to a state quantity by linearizing the equations on a stable-state operating point and can solve the characteristic value and the characteristic vector of a state equation coefficient matrix on the basis, obtain much information related to resonance damping characteristics by judging the stability of the subsynchronous resonance of the multi-machine power system and can be used for designing a controller to inhibit the subsynchronous resonance of the multi-machine power system by combining with a control theory.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Method and components for implementing EMC shielded resonance damping
InactiveUS7310243B2Magnetic/electric field screeningCurrent interference reductionReturn currentPrinted circuit board
A method and components are provided for implementing EMC shielded resonance damping of a printed circuit board. The EMC shielded resonance damping component includes a capacitor and resistor formed in series combination and contained within a shielded enclosure. A pair of coaxial pads is provided for connection to the printed circuit board. The series combination of the capacitor and resistor is connected between a first pad of a pair of coaxial pads and an interior wall of the shielded enclosure. The shielded enclosure provides a return current path to a second pad of the pair of coaxial pads through the series components.
Owner:IBM CORP
LCL filterer passive resonance damping circuit and method
InactiveCN105915033AFacilitates Resonance Suppression RetrofitsSuppress resonancePower conversion systemsCapacitancePower grid
The invention discloses an LCL filterer passive resonance damping circuit and method, and the circuit comprises an LCL filter and an LCR branch circuit. The LCL filter comprises a filter capacitor Cf, and the LCR branch circuit is in parallel connection with the filter capacitor Cf. The LCR branch circuit comprises a damping inductor Lz, a damping capacitor Cz, and a damping resistor Rz, wherein the damping inductor Lz, the damping capacitor Cz and the damping resistor Rz are in series connection. The LCR branch circuit presents pure resistor characteristics at a resonant frequency, provides damping for a system, and inhibits the resonance. A damping unit presents large capacitive reactance characteristics at a power grid fundamental frequency, and a passing current is smaller. The fundamental wave loss of a damping resistor is greatly reduced. The circuit achieves the inhibition of filter resonance under lower power loss, and a parallel installation mode does not change an original filter electrical node, thereby facilitating resonance inhibition change of an existing LCL filter.
Owner:NARI TECH CO LTD +3
Method and components for implementing EMC shielded resonance damping
InactiveUS20060011369A1Overcome disadvantagesMagnetic/electric field screeningCurrent interference reductionReturn currentPrinted circuit board
A method and components are provided for implementing EMC shielded resonance damping of a printed circuit board. The EMC shielded resonance damping component includes a capacitor and resistor formed in series combination and contained within a shielded enclosure. A pair of coaxial pads is provided for connection to the printed circuit board. The series combination of the capacitor and resistor is connected between a first pad of a pair of coaxial pads and an interior wall of the shielded enclosure. The shielded enclosure provides a return current path to a second pad of the pair of coaxial pads through the series components.
Owner:IBM CORP
Resonance damping method of parallel inverter system under islanding mode
ActiveCN106451497APerformance will not affectAchieving Resonance SuppressionPower oscillations reduction/preventionPower inverterIslanding
The invention discloses a resonance damping method of a parallel inverter system under an islanding mode. The resonance damping method includes that 1), parallel inverter units acquire respective output current, and the output current is subjected to first-order RC digital filtering to obtain respective feedback output current; 2), the inverter units multiply the respective feedback output current by introduced virtual impedance Zv and first-order RC series feedback digital filtering is conducted, so that respective additional voltage is obtained; 3), the inverter units superpose respective additional voltage to initial given voltage to obtain final voltage given instructions, the final voltage given instructions and feedback voltage subtract from each other, and differences are fed into a controller for regulation to obtain respective control voltage acting on the inverter units, so that resonance control of the parallel inverter system under the islanding mode is achieved. The resonance damping method of the parallel inverter system under the islanding mode has the advantages that virtual inductor L parameters are selected reasonably and a first-order RC series feedback digital filter is introduced to remold system network impedance, so that resonance damping is achieved and system stability is improved effectively.
Owner:CHONGQING UNIV
Resonance damping for audio transducer systems
ActiveCN104956693AMicrophone structural associationElectrostatic transducer microphonesTransducerAcoustic cavity
An apparatus (10) comprising: an audio transducer (201) configured to at least one of: generate sound upon receiving an audio signal provided by the apparatus (10); and convert sound into an audio signal to be processed by the apparatus (10); a housing component (301) comprising one or more sound apertures (303) configured to allow the transmission of sound through the one or more sound apertures (303); and an acoustic cavity (203) inside the apparatus (10) being acoustically coupled to the audio transducer (201) using the one or more sound apertures (303) wherein the one or more sound apertures (303) are configured to provide an acoustic damping.
Owner:NOKIA TECHNOLOGLES OY
Acid/alkaline hybrid resonance battery device with damping function
InactiveUS20160351972A1Fast chargingEasy dischargeCell electrodesParallel/serial switchingDamping functionBiochemical engineering
An acid / alkaline hybrid resonance battery device with damping function is formed of a plurality of similar battery cells connected in either series or parallel. Every battery cell includes an acid rechargeable cell unit and an alkaline rechargeable cell unit, which are electrically connected in parallel. The acid rechargeable cell unit includes at least one acid rechargeable cell, and the alkaline rechargeable cell unit includes at least two serially connected alkaline rechargeable cells. The acid rechargeable cell unit has an electric potential and a capacity close to or equal to those of the alkaline rechargeable cell unit, so that a resonance damping effect is produced between the acid rechargeable cell unit and the alkaline rechargeable cell unit.
Owner:HUMBOLDT STATE UNIVERSITY +1
Grid-connected converter resonance suppression method considering distributed capacitance of power transmission line
ActiveCN108258702ASuppression of deterioration of resonance characteristicsDiscretization is simpleSingle network parallel feeding arrangementsPower oscillations reduction/preventionCapacitanceLow-pass filter
The invention discloses a grid-connected converter resonance suppression method considering distributed capacitance of a power transmission line, relates to the field of grid-connected converter operation and control in large-scale new energy power generation, and is a grid-connected converter resonance damping technique for suppressing system resonance characteristic deterioration caused by the ground distributed capacitance of the line. The grid-connected converter resonance suppression method is a control method for a grid-connected converter based on forward path additional digital filterdamping, namely a digital filter is added in a conventional control circuit. The digital filter damping link involves a low-pass filter, preferably a third-order low-pass filter; when the cutoff frequency is set low, a high-frequency signal can be attenuated to a large extent, so that the cutoff frequency is 400 Hz to 610 Hz; when the system resonant peak amplitude is offset, the system resonanceis suppressed. The grid-connected converter resonance suppression method is simple in discretization in actual digital control, and greatly reduces the amount of system calculation, additional sensorsare not needed, and additional power loss is not generated; the robustness is strong, and the dynamic response is good.
Owner:TAIYUAN UNIV OF TECH
A resonance-free hydraulic vibration isolator and its vibration-damping module
The invention provides a resonance-peak-free hydraulic vibration isolator and a vibration reducing module of the resonance-peak-free hydraulic vibration isolator. The resonance-peak-free hydraulic vibration isolator comprises the vibration reducing module, a damping module and a connecting module. The vibration reducing module comprises a hydraulic limiting vibration reducing device and a main spring. The damping module comprises a waist-drum-shaped damping sleeve, a first damper and a second damper. The connecting module comprises an upper end cover, an upper limiting end cover, a middle cylinder, a lower end cover with a cylindrical protrusion, and a base. According to the resonance-peak-free hydraulic vibration isolator, the implementation structure of the damping module is simple, the structure of the combination between the bi-directional hydraulic vibration reducing device and the double dampers in the damping module can be matched with the waist-drum-shaped damping sleeve to provide stable damping force in the perpendicular direction and the horizontal direction, perpendicular bi-direction limiting can be achieved, a good centering reset effect on transverse vibration is achieved, and the resonance damping effect is good.
Owner:GUANGDONG POLYTECHNIC NORMAL UNIV +1
Multi-degree-of-freedom local resonance type super-damping composite structure
PendingCN113606274AAmplified damping effectSuppress vibration responseMultiple spring combinationsVibration attenuationLow frequency band
The invention relates to the technical field of damping vibration attenuation and noise reduction, and particularly discloses a multi-degree-of-freedom local resonance type super-damping composite structure. The structure comprises a base body and a damping piece installed on the surface of the base body, the damping piece comprises a plurality of multi-degree-of-freedom local resonance damping unit groups periodically distributed on the surface of the base body, and each multi-degree-of-freedom local resonance damping unit group comprises a plurality of multi-degree-of-freedom local resonance damping units. The structure is suitable for plate-shaped structures, shell-shaped structures and the like, and more efficient damping vibration attenuation can be achieved at a lower frequency band and a wider frequency band.
Owner:LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
Resonant type lithium battery device with damping function
InactiveCN106816908AStable chargingSmooth dischargeBatteries circuit arrangementsCells structural combinationDamping functionEngineering
The present invention discloses a resonant type lithium battery device with a damping function. At least one identical battery stack is connected in series and in parallel so as to form the resonant type lithium battery device; each battery stack includes a lithium-ion battery and a lithium-polymer battery; the lithium-ion battery and the lithium-polymer battery are connected in parallel; the lithium-ion battery is a current type batter, so that discharging can be benefitted; the lithium-polymer battery is a voltage type battery, so that charging can be facilitated; the voltage of the lithium-ion battery is the same as or close to the voltage of the lithium-polymer battery; and the lithium-ion battery and the lithium-polymer battery will generate a resonance damping effect due to a voltage automatic balance relation, and therefore, rapid charging and rapid discharging can be performed, temperature rise can be avoided, and the service life of the lithium battery device can be prolonged.
Owner:徐夫子 +1
ANC earphone acoustic test system
ActiveCN112312296AEasy to installEasy to replaceEarpiece/earphone noise reductionEngineeringHeadphones
The invention relates to the technical field of earphone acoustic structures, in particular to an ANC earphone acoustic test system. The system comprises an audio system, a test sound card, a test microphone, a converter and a console; the audio system comprises a test loudspeaker, and the test loudspeaker comprises a simulation front shell and a simulation rear shell; the simulation front shell is provided with a front cavity, the simulation front shell is also provided with a middle cavity, a duct and a leakage hole, the middle cavity is internally provided with a test space for accommodating a tested resonance damping horn box, the inner wall of the middle cavity is provided with an installation hole site, one end of the leakage hole is communicated with the front cavity, and the installation hole site is provided with an elastic flat pressing pipe body which is used for supporting and is communicated with the interior of the resonance damping horn box; and one end of the flat pressing pipe body is inserted into the mounting hole site. The ANC earphone acoustic test system can be used for testing a resonance damping loudspeaker box with a special structure, the tested resonancedamping loudspeaker box is easy to install and replace, and the actual earphone assembly environment of a loudspeaker is simulated.
Owner:深圳市逸音科技有限公司
An acoustic test system for anc earphones
ActiveCN112312296BEasy to installEasy to replaceEarpiece/earphone noise reductionConvertersHeadphones
Owner:深圳市逸音科技有限公司
A magnetoresistance element suitable for working at high temperature
ActiveCN107342359BImprove magnetic propertiesHigh reluctanceMagnetic-field-controlled resistorsGalvano-magnetic device detailsPerpendicular anisotropyResonance damping
The invention provides a magnetoresistance element suitable for working at high temperature, including a reference layer, a memory layer and a tunnel barrier layer, the magnetization direction of the reference layer is constant and the magnetic anisotropy is perpendicular to the layer surface; the The magnetization direction of the memory layer is variable and the magnetic anisotropy is perpendicular to the layer surface; the tunnel barrier layer is located between the reference layer and the memory layer and is respectively adjacent to the reference layer and the memory layer; The memory layer includes a first magnetic material layer, a second magnetic material layer and a non-magnetic coupling layer, and the non-magnetic coupling layer is located between the first magnetic material layer and the second magnetic material layer for The magnetization direction coupling of the first magnetic material layer and the second magnetic material layer are consistent. The design of the magnetoresistance element provided by the present invention can improve the magnetic performance of the memory layer magnetic material under high temperature conditions under the premise of taking into account high magnetoresistance ratio, high perpendicular anisotropy and low magnetic resonance damping.
Owner:SHANGHAI CIYU INFORMATION TECH
A matrix converter with source damping filter unit and its control method
ActiveCN104113218BReduce harmonic contentReduce THDConversion without intermediate conversion to dcMatrix convertersVoltage pulse
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Acoustic test system of active noise reduction earphone
The invention relates to the technical field of earphone acoustic structures, in particular to an acoustic test system of an active noise reduction earphone. The system comprises an audio system, a test sound card, a test microphone, a converter and a console; the audio system comprises a test loudspeaker, the test loudspeaker comprises a simulation front shell and a simulation rear shell, the simulation front shell is provided with a front cavity, the simulation front shell is further provided with a middle cavity, a hole channel and a leakage hole, the middle cavity is internally provided with a testing space used for containing the resonance damping loudspeaker box to be tested, the inner wall of the middle cavity is provided with an installation hole site, one end of the leakage hole is communicated with the front cavity, the installation hole site is provided with an elastic flat pressing pipe body which is used for supporting and is communicated with the interior of the resonance damping loudspeaker box, and the elastic flat pressing pipe body is provided with a through hole; and one end of the flat pressing pipe body is inserted into the mounting hole site. The acoustic testing system of the active noise reduction earphone can be used for testing a resonance damping loudspeaker box with a special structure, the tested resonance damping loudspeaker box is easy to install and replace, and the actual earphone assembling environment of a loudspeaker is simulated.
Owner:东莞市声强电子有限公司
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