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44results about How to "Applicable frequency range is wide" patented technology
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Miniature piezoelectric and capacitance composite vibration energy harvester
InactiveCN104506086AApplicable frequency range is wideNovel structurePiezoelectric/electrostriction/magnetostriction machinesInfluence generatorsCapacitanceEnergy technology
The invention relates to a miniature piezoelectric and capacitance composite vibration energy harvester, belonging to the technical field of MEMS (micro electro mechanical system) and micro energy. A piezoelectric energy harvesting unit is connected with the upper part of a support body, the lower part of the support body is bonded on a base body, and the interior of the support body is provided with a capacitance energy harvesting unit in which electrolyte is provided. The harvester has the advantages that a same mechanism is adopted to realize the energy harvesting of two different mechanisms, so as to achieve the effect of superimposing and magnifying the output energy, the energy conversion efficiency of a device is improved further by the structures of piezoelectric and capacitance energy harvesting units, broadband vibration energy harvesting can be realized efficiently, and the harvester is especially suitable for the vibration energy harvesting in a low-frequency small-amplitude environment.
Owner:JILIN UNIV
Vibration amplitude iterative control method based on transfer function
InactiveCN108827457AAchieve high precision controlSimple structureSubsonic/sonic/ultrasonic wave measurementVibration amplitudeControl system
The invention provides a vibration amplitude iterative control method based on a transfer function. The amplitude of an output vibration signal of a vibration exciter is adjusted to a value close to the amplitude of a target vibration signal via a primary input calculation and vibration driving process, the residual amplitude deviation is corrected rapidly via an iterative control process, and finally, the amplitude of the output vibration signal of the vibration exciter can be controlled in high efficiency and precision. According to the control method, a needed control system is simple in structure, operation flows are simple and the frequency range is wide, and the amplitude of the output vibration signal of the vibration exciter can be controlled in higher precision and efficiency.
Owner:TAIYUAN UNIV OF TECH
Self temperature compensation circular waveguide resonant cavity
The invention discloses a self temperature compensation circular waveguide resonant cavity, which relates to a waveguide resonant cavity and can remarkably reduce the influence of temperature on the resonant frequency of the resonant cavity. In the resonant cavity, a short-circuit cylinder (2) consists of a circular bottom surface (5) and a columnar cylinder wall (6), the bottom surface (5) of the short-circuit cylinder (2) is connected with one bottom surface cavity wall (7) of a metal cavity (1) through a support body (3), the thermal expansion coefficient of the support body (3) is greater than that of the metal cavity (1), and the outside diameter of the short-circuit cylinder (2) is slightly smaller than the inside diameter of a side wall (8) of the metal cavity (1); the bottom surface (5) of the short-circuit cylinder (2), the other bottom surface cavity wall (9) of the metal cavity (1) and the side wall (8) of the metal cavity form a resonant space (10) of electromagnetic wave; and an input / output coupling device (4) is positioned on the side wall (8) or the bottom surface cavity wall (9) of the metal cavity (1) in the resonant space (10).
Owner:NANJING UNIV OF POSTS & TELECOMM
Composite sound absorption plastic preparation method
InactiveCN103408859AWide range of sound absorption noiseAbsorbs a wide range of noisePorosityPolyvinyl chloride
Owner:WUJIANG CITY LI DA LUSTRE FINISHED PROD
Lightweight noise reduction composite foam material and method for preparing same
The invention discloses a lightweight noise reduction composite foam material and a method for preparing the same. The lightweight noise reduction composite foam material comprises, by weight, 42-62 parts of polyvinyl chloride, 14-23 parts of rock wool, 7-15 parts of styrene butadiene rubber, 10-20 parts of glass micro-spheres, 2-8 parts of glass fibers, 0.5-1.5 parts of foaming agents, 0.3-0.8 part of lubricants, 0.2-0.6 part of antioxidants and 0.5-0.9 part of coupling agents. The lightweight noise reduction composite foam material and the method have the advantages that the lightweight noise reduction composite foam material which is a foamable polyvinyl chloride and inorganic matter mixed sound absorption material prepared by the aid of the method is lightweight and is high in strength, and good sound absorption effects can be realized by the lightweight noise reduction composite foam material; low-frequency sound absorption of foamable polymers can be improved by the aid of the excellent low-frequency sound absorption performance of inorganic materials, and the low and medium-frequency sound absorption performance of the lightweight noise reduction composite foam material canbe greatly improved by the added rock wool; the polyvinyl chloride can be reinforced by the glass fibers and is filled with the glass micro-spheres, and effects of integrally reducing the density of polyvinyl chloride composite materials can be realized by hollow structures of the glass micro-spheres.
Owner:合肥卓创新材料有限公司
High frequency antenna cover
ActiveCN106602250ALittle change in electrical propertiesApplicable frequency range is wideRadiating element housingsWide beamEngineering
The invention provides a high frequency antenna cover which comprises a side wall and first and second end covers which are respectively arranged at two end parts of the side wall and are connected to the side wall. Both the first and second end covers are semicircular planes. The planes where the first and second end covers are located are parallel to the radiation direction of an antenna. An arch-shaped semi-cylindrical cover body is arranged between the first end cover and the second end cover. The edge of the cover body is smoothly connected to the side wall, the first end cover and the second end cover. The high frequency antenna cover is suitable for a wide beam antenna.
Owner:TONGYU COMM INC
Gysel-type power divider based on substrate integrated waveguide
The invention discloses a Gysel-type power divider based on a substrate integrated waveguide, and the power divider comprises a first port, a second port, a third port, a fourth port, and a fifth port. The first port is disposed on a central line of the power divider, and the power divider is symmetric relative to the central line. The first port is a common port, and the second and third ports are branch ports. The fourth and fifth ports are load ports. The power divider employs a substrate integrated waveguide structure, and comprises an upper metal surface, a central dielectric plate, and a lower metal surface. Two rows of second metal post line columns are disposed between the upper metal surface and the lower metal surface. Each row of second metal post line columns comprises a plurality of metal columns, and each metal column contacts with the upper metal surface and the lower metal surface. The power divider meets the actual demands of high power and high isolation, is small in size, is light in weight, and is suitable for the power combination and distribution of various types of SIW systems.
Owner:NANJING UNIV OF SCI & TECH
Detection method for common mode disturbance of ground loop
ActiveCN109188152AApplicable frequency range is wideMethod securityMeasuring interference from external sourcesTime domainElectromagnetic interference
The invention discloses a detection method for common mode disturbance of a ground loop. The method adopts time-domain analysis in combination with frequency-domain analysis, and detects the common mode disturbance between any two ground points which covers 0 Hz to 150 KHz, so as to clearly judge the disturbance condition of an equipment or a system in the ground loop, and finally used for supporting the selection and the confirmation of the electromagnetic compatibility ground point. The method comprises the following steps of an investigating stage, a detecting stage, and an analyzing stage:in the investigating stage, acquiring parameter characteristics of a system to-be-detected or an equipment to-be-detected, wherein the parameter characteristics comprise a normal working electric parameter range, a sensitive frequency range, a transmission frequency range, and an alternative equipotential ground point of a sensing element; the detecting stage comprises a time-domain detecting anda frequency-domain detecting, and acquiring a disturbance signal of a required frequency range through the time-domain detecting and the frequency-domain detecting; and in the analyzing stage, analyzing and judging the risk of the electromagnetic interference, and selecting the ground point supporting electromagnetic compatibility by judging whether the ground loop has conducted disturbances andjudging the disturbance strength corresponding to different disturbance frequencies.
Owner:BOMBARDIER SIFANG QINGDAO TRANSPORTATION
Magnetorheological elastomer intelligent vibration absorber used for ships
InactiveCN101513924BSimple structureGood vibration absorptionNon-rotating vibration suppressionVessel stability improvementElastomerWhole body
Owner:HARBIN ENG UNIV
Method for preparing organic polymer/inorganic mineral composite foamed sound-absorbing material
InactiveCN1288203CApplicable frequency range is wideImprove the sound absorption coefficientSound proofingFoaming agentPolymer science
Owner:XI AN JIAOTONG UNIV
A Controllable Hybrid Electromagnetic Coupling Substrate Integrated Waveguide Filter
ActiveCN105762448BImprove featuresFlexible designWaveguide type devicesElectromagnetic couplingResonance
The invention discloses a substrate integrated waveguide filter with the characteristic of controllable hybrid electromagnetic coupling. The substrate integrated waveguide filter comprises a substrate integrated waveguide resonance cavity. The substrate integrated waveguide resonance cavity consists of a dielectric substrate, two metal layers arranged at the front side and the back side of the dielectric substrate, and peripheral metallic through holes that are formed along the edges of the dielectric substrate and penetrate the two metal layers. An input port and an output port are arranged at the two ends of the substrate integrated waveguide. A plurality of internal metallic through hole groups are formed in the area encircled by the peripheral metallic through holes and include internal metallic through holes that are arranged at two columns in a collinear mode; a sensitive window is formed between the two columns of the internal metallic through holes. A non-resonant node structure arranged above the sensitive window is arranged on the upper metal layer. According to the invention, the electric coupling strength is controlled by adjusting the non-resonant node structure and the magnetic coupling strength is controlled by adjusting the width of the sensitive window, so that whether the transmission zero point is arranged on an upper stop band or a lower stop band can be controlled.
Owner:XINYANG NORMAL UNIVERSITY
Time delay measuring system and method for analog mixer and low-pass filter
InactiveCN109612570AEasy to measureApplicable frequency range is wideSubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansBand-pass filterEngineering
The invention discloses a time delay measuring system and method for an analog mixer and a low-pass filter. The time delay measuring method comprises the steps that the analog mixer and the low-pass filter are used for high carrier frequency narrow bandwidth signals, based on a phase unwrapping method and three parameter sinusoidal approximation method and with a high-resolution oscilloscope, downconversion time delay of the analog mixer and the low-pass filter is measured; frequency reducing is carried out on high carrier frequency narrow bandwidth FM signals through the analog mixer and thelow-pass filters , the high carrier frequency is reduced to a lower level, so that the FM signals can be collected by using a lower sampling rate; and by changing the frequency of the modulated signals or the carrier frequency, FM signals of different narrow bandwidths or different carrier frequencies are obtained, through demodulation and calculation, the time delay of the analog mixer and the low-pass filter at different frequency points or different carrier frequencies are obtained and compensated, and thus the measurement accuracy is improved. The time delay measuring system and method have the advantages of simple measuring process and wide frequency range.
Owner:NAT INST OF METROLOGY CHINA +1
Ultrasonic power supply and power supply method thereof
ActiveCN113014115ASolve technical problems with poor job stabilityApplicable frequency range is wideConversion without intermediate conversion to dcEngineeringAcoustics
The invention discloses an ultrasonic power supply and a power supply method thereof. The ultrasonic power supply comprises a main control unit, a first modulator, a power amplifier and a coupler, the main control unit is used for generating a preset signal; the first modulator is used for performing pulse width modulation on the preset signal to obtain an electric pulse; the power amplifier is used for amplifying the electric pulse and outputting the amplified electric pulse to the coupler; the output end of the coupler is used for being connected with an ultrasonic component. According to the present invention, the technical problem that the working stability of an existing ultrasonic power supply is worse due to the fact that the output power linearity of the existing ultrasonic power supply is poor, is solved.
Owner:KEYIZHAN INTELLIGENT EQUIP CO LTD +1
Broadband high-precision phase-locked loop circuit
InactiveCN107979370AGuaranteed stabilityQuick rough lockPulse automatic controlPhase locked loop circuitLoop bandwidth
The invention discloses a broadband high-precision phase-locked loop circuit which comprises a phase-looked loop 1, a phase-looked loop 2 and a loop selection module. The phase-looked loop 1 is high in loop gain and wide in frequency range and is used for rough locking of frequency points. The phase-looked loop 2 is narrow in loop bandwidth and used for reducing frequency and phase errors and guaranteeing low jitter. The loop selection module realizes operation switching of the phase-looked loop 1 and the phase-looked loop 2 according to digital signals outputted by a digital filter in the phase-looked loop 1. The broadband high-precision phase-locked loop circuit is characterized in that in initial operation, the phase-looked loop 1 high in loop gain is adopted for rough locking of a target frequency point, then the loop selection module controls to switch operation of the phase-looked loop 2, and accurate frequency and phase adjustment is realized. The broadband high-precision phase-locked loop circuit has advantages of wide frequency locking range, quickness in capturing, high precision, high stability and the like.
Owner:HARBIN UNIV OF SCI & TECH
Short circuit tube temperature compensation rectangular waveguide resonant cavity
InactiveCN101764278AReduce the change of resonant frequency with temperatureSimple structureResonatorsResonant cavityCoupling
The invention relates to a short circuit tube temperature compensation rectangular waveguide resonant cavity, belonging to waveguide resonant cavity and aiming to obviously decreasing influence of temperature on resonant frequency of resonant cavity. The resonant cavity is composed of a metal cavity (1), a short circuit tube (2), a supporting body (3), and one or a plurality of input-output coupling devices (4); the short circuit tube (2) is arranged in the metal cavity (1) and of a cuboid shape; the supporting body (3) is arranged between the first top cavity wall (6) of the metal cavity (1)and the bottom (5) of the short circuit tube (2); the short circuit tube (2), the second top cavity wall (9) of the metal cavity (1), and the wide side cavity wall (8) and the narrow side cavity wall(10) of the metal cavity form a resonant space (11) of electromagnetic wave; and the input-output coupling devices (4) are arranged on part of top cavity wall (9), or wide side cavity wall (8), or narrow side cavity wall (10) of the metal cavity (1), the part in the resonant space (11).
Owner:SOUTHEAST UNIV
Phase locked loop circuit based on spin oscillator
ActiveCN106899292AHighly integratedApplicable frequency range is widePulse automatic controlPhase detectorPower flow
The invention discloses a phase locked loop circuit based on a spin oscillator. The phase locked loop circuit comprises a phase detector, a lowpass filter and the spin oscillator. When a control signal is applied to the spin oscillator, an oscillation signal is generated. The oscillation signal is output through the output end of the phase locked loop circuit and is fed back to the phase detector through a feedback loop which is connected with the output end of the phase locked loop circuit and the phase detector. The spin oscillator may comprise a spin injection layer and a magnetic precession layer arranged on the spin injection layer. When the spin injection layer receives non-spin polarized current input, spin polarized current output is generated. The magnetic precession layer is formed by a magnetic conductive material and receives a spin polarized current from the spin injection layer. In response to the spin polarized current, a magnetic torque of the magnetic precession layer generates precession, thereby generating the oscillation signal.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
A multi-frequency anti-vibration hammer
ActiveCN106655051BMeet applicable requirementsStable structureDevices for damping mechanical oscillationsEngineeringHigh pressure
The invention discloses a multi-frequency damper comprising a wire clamp, a connecting component and hammer head components, wherein the hammer head component comprises a steel strand and hammer heads fixed to two ends of the steel strand separately, the steel strand is fixedly connected with a connection component, the connection component is a triangular connecting plate, two groups of hammer head components are arranged, the wire clamp is fixedly connected with one angular end of the triangular connecting plate, and a group of hammer head components is fixedly connected to the other two angular ends of the triangular connecting plate. The multi-frequency damper disclosed by the invention has the advantages of novel structure design, good overall stability, easy installation and control of applicable frequency range, dense product organization and good comprehensive properties of products, and the overall design is suitable for high pressure casting.
Owner:JIANGDONG FITTINGS EQUIP
Nickel-zinc ferrite material and preparation method thereof
ActiveCN112194481AApplicable frequency range is wideHigh permeability peak frequencyInorganic material magnetismInductances/transformers/magnets manufactureNickel-zinc ferritePhysical chemistry
The invention discloses a nickel-zinc ferrite material and a preparation method thereof. The nickel-zinc ferrite material comprises main components and auxiliary components, wherein the main components consist of the following components in percentage by mole: 48%-51% of Fe oxide, 12%-18% of Ni oxide, 15%-23% of Zn oxide and 4%-7% of Co oxide, with the balance being Cu oxide; and the auxiliary components comprise a Mn compound and a Ca compound. The nickel-zinc ferrite provided by the invention has the characteristics of wide applicable frequency range, high magnetic conductivity peak frequency, small specific loss coefficient, high saturation magnetization, low coercive force and high Curie temperature, and presents wide application prospects.
Owner:LANZHOU UNIVERSITY
Self temperature compensation round waveguide TE011 mode resonant cavity
InactiveCN101771186BReduce the change of resonant frequency with temperatureSimple structureResonatorsResonant cavityThermal expansion
The invention discloses a self temperature compensation round waveguide TE011 mode resonant cavity which can obviously decrease the influence of the temperature on the resonant frequency of the resonant cavity. In the resonant cavity, a metal cavity (1) is a hollow cylinder; a short-circuit board (2) is arranged in the metal cavity (1); the short-circuit board (2) is connected with an upper bottom cavity wall (5) of the metal cavity (1) by a support (3); the coefficient of thermal expansion of the support (3) is more than the coefficient of thermal expansion of the metal cavity (1); one end of the support (3) is fixed on the upper bottom cavity wall (5) of the metal cavity (1) while the other end is fixed on the short-circuit board (2); the short-circuit board (2) is of a round disc shapeand is slightly smaller than the upper bottom cavity wall (5); the short-circuit board (2), an upper bottom cavity wall (6) of the metal cavity (1) and a side wall (7) of the metal cavity (1) form anelectromagnetic wave resonance space (8); and an input output coupling device (4) is arranged on the side wall (7) or the upper bottom cavity wall (6) of the metal cavity (1) of the electromagnetic wave resonance space (8).
Owner:NANJING UNIV OF POSTS & TELECOMM
Self-temperature compensating rectangular waveguide resonant cavity
InactiveCN101710638BReduce the change of resonant frequency with temperatureSimple structureResonatorsResonant cavityResonance
The invention discloses a self-temperature compensating rectangular waveguide resonant cavity, which relates to the waveguide resonant cavity and can remarkably decrease the influence of temperature on the resonance frequency of the resonant cavity. A short circuit board (2) is positioned in a metal cavity (1). The thermal expansion coefficient of a support body (3) is greater than that of the metal cavity (1). The short circuit board (2) is connected with the top cavity wall (5) of the metal cavity (1) through the support body (3) and is of a shape similar to that of the top cavity wall (5) and in a size slightly smaller than that of the top cavity wall (5). The short circuit board (2), and another top cavity wall (8), the narrow cavity wall (6) and the wide cavity wall (7) of the metal cavity (1) form a resonant space (9) of electromagnetic waves. An input and output coupling device (4) is positioned on the top cavity wall (8) or the narrow cavity wall (6) or the wide cavity wall (7) of the metal cavity (1) in the resonant space (9).
Owner:SOUTHEAST UNIV
On-line monitoring and diagnosis method for common faults of combustion chamber components of marine medium-speed diesel engine
ActiveCN110108494BTake advantage ofRealize monitoring and diagnosisInternal-combustion engine testingCombustion chamberDieseling
Owner:WUHAN UNIV OF TECH
Electromagnetic vibration table harmonic control system and method based on neural network inverse model
ActiveCN114779650AHigh precisionAchieving Harmonic ControlAdaptive controlHarmonic reduction arrangementAlgorithmHarmonic control
The invention relates to the technical field of vibration harmonic control, in particular to an electromagnetic vibration table harmonic control system and method based on a neural network inverse model, and the system comprises a program control signal source, the neural network inverse model, an electromagnetic vibration table system, a vibration detection unit, a data collection unit, data processing software and harmonic analysis software. The system is based on a neural network inverse model, an electromagnetic vibration table is excited by setting an input quantity, an input voltage signal and an output vibration signal are processed to obtain a neural network inverse system training sample, and the output of the trained neural network inverse model is connected with the input of the electromagnetic vibration table in series. Accurate tracking of vibration signals output by the electromagnetic vibration table on expected signals input into the neural network inverse model is achieved. The control system disclosed by the invention is simple in composition structure, simple and convenient in operation process and wide in applicable frequency range, and has relatively high control precision on harmonic waves of vibration signals output by the electromagnetic vibration table.
Owner:TAIYUAN UNIV OF TECH
Cylindrical Dielectric Properties Measuring Box for Isolated Biological Tissue
InactiveCN102928670BControl volumeEasy to measureResistance/reactance/impedenceFrequency spectrumSilver electrode
The invention discloses a dielectric property measuring box for cylindrical in vitro biological tissues. The dielectric property measuring box consists of a measuring box and a measuring box cover, wherein two silver ring electrodes are inlaid in an inner wall of the measuring box at intervals; an inner surface of each silver ring electrode has the same height as the inner wall of the measuring box; a silver disc electrode is inlaid on the measuring box cover; and when the measuring box cover is fastened to the measuring box, the silver disc electrode is tightly contacted with the measuring box. Four silver electrodes on the measuring box can be led out and are correspondingly connected with an impedance analyzer, the corresponding parameters of the impedance analyzer are set, the electrical impedance frequency spectrum of the biological tissue to be tested is obtained, and the conductivity and dielectric coefficient of the biological tissue to be tested can be calculated according to a corresponding formula. The appearance of the tested tissues can be accurately controlled, the measuring box is particularly suitable for dielectric property measurement of small-sized in vitro soft tissues, and accurate measurement is convenient.
Owner:FOURTH MILITARY MEDICAL UNIVERSITY
Organic polymeter as electromagnetic shielding material and its prepn process
InactiveCN100427546COvercome the shortcoming of low overall shielding effectivenessLow densityMagnetic/electric field screeningPolymer scienceAniline
The organic polymer as electromagnetic shielding material and its preparation process belongs to the field of material science and technology. The organic polymer as electromagnetic shielding material has organic polymer of polymerization degree n of 20-400 in the shown structure as the main component. It is prepared with the monomer with aniline and ferrocene as main material, and through slowly dropping oxidant solution into the monomer solution to polymerize and adding proper amount of dopant. The polymer has in its molecular structure polyaniline as the conducting mother substance and ferrocene as the magnetic radical, so that it has both electric conductivity and magnetism. It has high comprehensive shielding effect, low density, wide applicable frequency range, low temperature coefficient, low magnetic loss and other excellent characteristics, and may find wide application in electromagnetic shielding, wave absorption, etc.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method and device for calculating true RMS
PendingCN113866488AImprove stabilityHigh precisionEffective value measurementsAC - Alternating currentA d converter
The invention provides a method and device for calculating a true RMS; the method comprises the steps: setting an analog-to-digital converter to be in an automatic continuous conversion mode, and setting a corresponding conversion frequency; according to the Nyquist sampling theorem, carrying out high-speed sampling on the measured signal and the internal signal through an analog-to-digital converter, and obtaining an external alternating current signal and an internal voltage signal; calculating an AC signal value according to the external AC signal and the internal voltage signal; and carrying out integral calculation according to the alternating current signal value by combining a thermal equivalence principle to obtain a voltage true RMS. A low-cost scheme can be adopted, the true RMS is calculated according to an integral method, the stability is good, and the precision is high.
Owner:CHONGQING HUAHONG INSTR
Phase Locked Loop Circuit Based on Spin Oscillator
ActiveCN106899292BHighly integratedApplicable frequency range is widePulse automatic controlPhase detectorPhase locked loop circuit
The invention discloses a phase locked loop circuit based on a spin oscillator. The phase locked loop circuit comprises a phase detector, a lowpass filter and the spin oscillator. When a control signal is applied to the spin oscillator, an oscillation signal is generated. The oscillation signal is output through the output end of the phase locked loop circuit and is fed back to the phase detector through a feedback loop which is connected with the output end of the phase locked loop circuit and the phase detector. The spin oscillator may comprise a spin injection layer and a magnetic precession layer arranged on the spin injection layer. When the spin injection layer receives non-spin polarized current input, spin polarized current output is generated. The magnetic precession layer is formed by a magnetic conductive material and receives a spin polarized current from the spin injection layer. In response to the spin polarized current, a magnetic torque of the magnetic precession layer generates precession, thereby generating the oscillation signal.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
Gysel Power Divider Based on Substrate Integrated Waveguide
The invention discloses a Gysel-type power divider based on a substrate integrated waveguide, and the power divider comprises a first port, a second port, a third port, a fourth port, and a fifth port. The first port is disposed on a central line of the power divider, and the power divider is symmetric relative to the central line. The first port is a common port, and the second and third ports are branch ports. The fourth and fifth ports are load ports. The power divider employs a substrate integrated waveguide structure, and comprises an upper metal surface, a central dielectric plate, and a lower metal surface. Two rows of second metal post line columns are disposed between the upper metal surface and the lower metal surface. Each row of second metal post line columns comprises a plurality of metal columns, and each metal column contacts with the upper metal surface and the lower metal surface. The power divider meets the actual demands of high power and high isolation, is small in size, is light in weight, and is suitable for the power combination and distribution of various types of SIW systems.
Owner:NANJING UNIV OF SCI & TECH
Pulley type tuned mass eddy current damper
ActiveCN113789879AApplicable frequency range is wideDecreased static elongationBridge structural detailsProtective buildings/sheltersElectrical conductorClassical mechanics
The invention relates to an eddy current damper, in particular to a pulley type tuned mass eddy current damper. The pulley type tuned mass eddy current damper is characterized by comprising a mass block, the mass block is connected with a spring assembly through a pull rope and a pulley block, the pulley block comprises a movable pulley, the spring assembly is fixedly connected with the lower part of the movable pulley, the mass block is fixedly connected with a magnetic steel back plate and magnetic steel, and the mass block can drive the magnetic steel and a conductor plate to move relative to each other and generate eddy current. According to the pulley type tuned mass eddy current damper, the pulley block is additionally arranged, and the corresponding relation between static elongation and frequency is changed through the pulley block, so that the static elongation of the spring is reduced. Therefore, the tuned mass eddy current damper can break through the limitation of installation space, and the applicable frequency range of the tuned mass eddy current damper is expanded.
Owner:湖南省潇振工程科技有限公司
Vibration equipment for cell culture fluid
ActiveCN105176796BHigh sensitivityApplicable frequency range is wideBioreactor/fermenter combinationsBiological substance pretreatmentsVibrating membraneCulture fluid
The invention discloses vibrating equipment of cell culture fluid. The vibrating equipment of the cell culture fluid comprises a signal generator and a loudspeaker which is electrically connected with the signal generator, the loudspeaker comprises a magnet, a basin frame and a vibrating membrane, and the vibrating membrane promotes the cell culture fluid to vibrate. According to the vibrating equipment of the cell culture fluid, vibration of the vibrating membrane of the loudspeaker is utilized to promote the cell culture fluid to vibrate, the sensitivity is higher, and the applicable frequency range is wider.
Owner:SUZHOU UNIV
A Miniature Piezoelectric and Capacitive Composite Vibration Energy Harvester
InactiveCN104506086BApplicable frequency range is wideNovel structurePiezoelectric/electrostriction/magnetostriction machinesInfluence generatorsSmall amplitudeCapacitance
The invention relates to a miniature piezoelectric and capacitance composite vibration energy harvester, belonging to the technical field of MEMS (micro electro mechanical system) and micro energy. A piezoelectric energy harvesting unit is connected with the upper part of a support body, the lower part of the support body is bonded on a base body, and the interior of the support body is provided with a capacitance energy harvesting unit in which electrolyte is provided. The harvester has the advantages that a same mechanism is adopted to realize the energy harvesting of two different mechanisms, so as to achieve the effect of superimposing and magnifying the output energy, the energy conversion efficiency of a device is improved further by the structures of piezoelectric and capacitance energy harvesting units, broadband vibration energy harvesting can be realized efficiently, and the harvester is especially suitable for the vibration energy harvesting in a low-frequency small-amplitude environment.
Owner:JILIN UNIV
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