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61 results about "Natural mode" patented technology
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The concept of natural modes is conventional. The word “natural” signifies “existing in or produced by nature.” However, if diatonicism is natural in European music and constitutes the European modal system, then modes that incorporate nondiatonic intervals—for example, an augmented second—are no less natural in Oriental music.
Electromagnetic coupling
InactiveUS6850128B2Improve power performanceLow profileMultiple-port networksOne-port networksElectricityElectromagnetic coupling
An orthogonal electrical coupling relies on electromagnetic coupling for the inner connection, as opposed to direct contact between conductors. A conductor on one of the lines is connected to a ground plane which is adjacent to a resonant slot. Microwave energy is coupled to the slot, thereby exciting the slot. A second conductor is on the opposite side of the ground plane from the first conductor. Microwave energy from the excited resonant slot passes to the second conductor, thereby allowing contactless interconnection between the first conductor and the second conductor. The coupling may emphasize certain modes of propagation relative to other possible modes of propagation. Specifically, the ground plane and slot may be enclosed in a cavity of a size such that the cavity does not support any natural mode propagation inside the cavity. Instead, the coupling may have a cavity in which a transverse electromagnetic (TEM) mode is propagated.
Owner:RAYTHEON CO
Simulated spacecraft wallboard structure fluttering/vibrating control device and method
InactiveCN103399570AExcellent chatter characteristicsElectric testing/monitoringVibration testingElectricityVibration control
The invention discloses a simulated spacecraft wallboard structure fluttering / vibrating control device and method. The device comprises a flexible board body, a mechanical clamping device, a signal generator, a computer, an A / D (analog / digital) conversion data collecting card, a D / A conversion card, a piezoelectric ceramic drive power source, an acceleration sensor, piezoelectric ceramic piece sensors and piezoelectric ceramic piece drive devices. The flexible board is fixed through two ends of the mechanical clamping device, a plurality of piezoelectric ceramic piece sensors and piezoelectric ceramic piece drive devices are adhered on the flexible board structure and provided with the acceleration sensor. The signal generator stimulates a natural mode of the flexible board through a piezoelectric ceramic piece stimulation drive device and the piezoelectric ceramic drive power source, when the sensors detect a vibrating signal of the flexible board, an active control algorithm is operated, the controlled quantity is applied onto the piezoelectric ceramic piece control drive device through the piezoelectric ceramic drive power source, so that the vibration of the flexible two-end fixed supporting plate can be actively controlled.
Owner:SOUTH CHINA UNIV OF TECH
Non-contact control method of bionic manipulator based on learning of hand motion gestures
ActiveCN106346485ARealize touchless controlEasy to controlProgramme-controlled manipulatorImage analysisHigh dimensionalModelling methods
The invention provides a non-contact control method for controlling a five-finger bionic manipulator through learning hand motion gestures and belongs to the field of intelligent control. According to the method, a three-dimensional hand modeling method with adaptivity is proposed, motion gestures of all joint points of a hand of a control worker are tracked according to a three-dimensional hand model, and a corresponding relationship between the motion gestures of the hand and action commands of the manipulator is established with a mapping algorithm, so that the control worker controls the five-finger manipulator in a natural mode. Under the condition of utilization of RGB-D images, the three-dimensional hand model is established to describe pose parameters of the joints of the hand, an improved APSO (adaptive particle swarm optimization) algorithm is proposed to solve the pose parameters, the rate of convergence of solution of high-dimensional parameters is effectively increased, limitation of wearable devices such as data gloves and the like is avoided, and the defects that a conventional control method based on a sensor can only acquires poses of part of joints of the hand and cannot be applicable to a bionic multi-fingered hand with high degree of freedom are overcome.
Owner:DALIAN UNIV OF TECH
Method for improving respiratory rate detection accuracy
InactiveCN101991418AImprove anti-interference abilityReliable calculationRespiratory organ evaluationFrequency spectrumInterference resistance
The invention discloses a method for improving respiratory rate detection accuracy, comprising the following steps of: preprocessing respiratory data by utilizing high pass and low pass filtering; then carrying out empirical mode decomposition on the preprocessed respiratory data; subsequently, selecting a natural mode function obtained by the decomposition according to the physiological feature of a respiratory signal; then carrying out choking judgment on the obtained natural mode function by utilizing a method of getting the absolute value and solving the average; and if the choking judgment condition is not satisfied, figuring out the respiratory rate at the time by utilizing a wave form method or a frequency spectrum method. By adopting the technical scheme, the respiratory signal can be effectively extracted from respiratory waves of dysphoria interference and heartbeat interference. The method of the empirical mode decomposition effectively overcomes the defect that the respiratory signal containing the interference is directly processed by the wave form method and the frequency spectrum method, and finally, the weighted average of the historical respiratory rate is introduced, and thereby, the interference resistance of respiratory detection can be improved to make the respiratory rate calculation stable and reliable.
Owner:EDAN INSTR
In-plane-control-based active vibration control method for wrinkled film
ActiveCN108897213AReduce vibrationImprove anti-disturbance abilityAdaptive controlControl orientedIn plane
The invention relates to an in-plane-control-based active vibration control method for a wrinkled film. On the basis of the analysis on the influence on dynamic characteristics of a film structure bya wrinkle form, a dynamic model of a wrinkled film is established; according to a modal superposition method, a space vector based on a natural mode of vibration is obtained and dynamic models of thewrinkled film under different loads are established; condensation polymerization is carried out on the dynamic models according to contributions to system vibration deformation by all orders of modes,so that a control-oriented film structural dynamic model is established; and with a model reference adaptive controller, a PID-MRAC control method based on in-plane-control multi-model switching is proposed. According to the method provided by the invention, no actuator needs to be pasted on the surface of the film; the out-of-plane vibration of the film is suppressed effectively; the characteristics of the film are not affected; the high stability of the film structure is ensured; and compared with the conventional PID control method, the in-plane-control-based active vibration control method enables the vibration time to be shortened by about 39.7%.
Owner:BAOJI UNIV OF ARTS & SCI +1
Determination method and system for unbalance mass of cylindrical shell gyroscope harmonic oscillator
ActiveCN108844555AImprove discriminationLow costSpeed measurement using gyroscopic effectsGyroscopes/turn-sensitive devicesGyroscopeVibratory signal
The invention discloses a determination method and system for the unbalance mass of a cylindrical shell gyroscope harmonic oscillator. The method comprises the following steps: A, applying a driving signal to an electromagnet to excite the natural mode of vibration of oscillator, wherein the frequency of the driving signal is equal to the inherent frequency of the oscillator; B, measuring a vibrating signal of an oscillator supporting rod by means of an piezoelectric electrode to obtain an output amplitude of the piezoelectric electrode; and C, rotating the vibrator at different angles, and fitting the output amplitude of the corresponding piezoelectric electrode to obtain an azimuth angle of the unbalance mass and the amplitude of the unbalance mass. By exciting the natural mode of vibration of oscillator, the vibrating amplitude of the supporting rod at different angles is measured, and fitting analysis is performed on the measured data, so that the azimuth of the unbalance mass andthe amplitude of the unbalance mass can be judged conveniently and rapidly, and the cost is extremely low.
Owner:NAT UNIV OF DEFENSE TECH
Seismic fluid prediction method based on VMD and TK energy operators
InactiveCN109164489AEfficient extractionAccurate predictionSeismic signal processingVariational mode decompositionEnergy spectrum
The invention discloses a seismic fluid prediction method based on VMD and TK energy operators. The method comprises the following steps: S1, performing variational mode decomposition on a seismic signal to obtain a set of modal components that reflect a natural mode of vibration inside the seismic signal and have an instantaneous frequency with real physical meaning; S2, getting TK energy spectrums of each modal component by using the TK energy operators to obtain more accurate energy distribution on a signal time frequency; and S3, performing effective and accurate seismic fluid prediction by searching fluid characteristics of ''enhanced low frequency energy and attenuated high frequency energy'' of oil and gas contained in the reservoir. The seismic fluid prediction method based on VMDand TK energy operators combines the variational mode decomposition with the TK energy operators, which has stronger identification for the fluid-containing characteristics of the reservoir, and can effectively improve the accuracy of seismic fluid prediction.
Owner:SOUTHWEST PETROLEUM UNIV
Method for removing noises of wind profile radar based on Hilbert-Huang transform
InactiveCN102736070ASuppression of non-stationary noise interfering signalsAdaptableICT adaptationRadio wave reradiation/reflectionWind profilerDecomposition
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Method and sensor arrangement for measurement on rolling element bearing
Method and sensor arrangement for determining a contact force vector acting on a rolling element bearing (1) in operation. Sensor signals are received from a plurality of sensors (8) measuring performance characteristics of the rolling element bearing (1). The received sensor signals are processed to determine the contact force vector. The plurality of sensors (8) are arranged to measure a bearing component deformation, and the step of processing comprises the step of determining the contact force vector using an inverse transformation of a finite element analysis model which describes the rolling element bearing (1). The finite element analysis model is simplified using at least one generalised mode shape, the at least one generalised mode shape being a mathematical description of a natural mode deformation of a component of the rolling element bearing (1), such as the inner or outer ring (5, 6).
Owner:AB SKF
Apparatus and method for suspending a stator core of an electric generator
InactiveUS20040000819A1Magnetic circuit stationary partsMechanical energy handlingElectric generatorStator
An apparatus and method for suspending a stator core (100) in an electric generator upon a foundation (206), where two natural modes of vibration, including known second and third modes, are excited in the core, each mode having four loops and four nodes displaced 45 degrees between the second and third modes. A non-rigid connection (212) connects a yoke to the foundation, and two connection members connect the yoke to the stator core at opposite sides of the non-rigid connection. The two connection points (210a,b) are located at adjacent loops of one of the second and third vibration modes. By this arrangement, radial deflections of the stator core at the respective connection points are transferred into a rocking movement of the yoke around the non-rigid connection. Thereby, vibrations transferred to the foundation are considerably reduced during operation.
Owner:ALSTOM TECH LTD
Aircraft multi-axis modal suppression system
InactiveUS20060237594A1Accurate inductionActuated automaticallyActive noise reduction systemControl signalEngineering
Owner:THE BOEING CO
Micro-motion test method and system for structural damage detection of civil engineering wallboard
InactiveCN103076397ASimple methodGood precisionAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalElement modelFinite difference model
The invention discloses a micro-motion test method and system for structural damage detection of a civil engineering wallboard. The micro-motion test method comprises the following steps: a plurality of detectors are arranged on the surface of the wallboard according to the masonry, damage and other characteristics of a structure, and micro-motion signals are acquired through the detectors and recording equipment; the natural frequency and the natural mode of vibration of the structure are acquired through mathematical analysis; a finite element model (finite difference model) of the structure is built and perfected for eigenvalue computation so as to acquire the natural frequency, the natural mode of vibration and other dynamic response parameters; and the natural frequencies and the natural modes of vibration of a computation module and an actual measurement structure are compared to evaluate the break position and the break value (rigidity loss) of the response and position and quantify the damage. The invention further provides a corresponding system. The method and system have the advantages of simple equipment, high efficiency, no structural damage, strict transactional analysis, high precision of the analytic method, and no influence from the structural damage degree and complexity. Therefore, the invention provides a brand-new method for structural damage detection of the civil engineering.
Owner:SHANGHAI JIAO TONG UNIV
Aircraft multi-axis modal suppression system
InactiveUS6915989B2Accurate inductionActuated automaticallyActive noise reduction systemFlight vehicleControl signal
Vibrations due to excitation of the natural modes of an aircraft's body are suppressed by an active multi-axis modal suppression system. Dedicated sensors are positioned in the aircraft at optimal locations for sensing modal induced vibrations. The sensor produced signals are processed through control logic which, in response thereto, and in response to aircraft inertial, velocity and altitude related signals produces output control signals. The control signals effect control surface deployment creating forces to suppress the natural mode induced vibrations on multiple geometric axis's. More particularly, symmetric and anti-symmetric control surface deployments are used on one or more geometric axis's to damp lateral, longitudinal, vertical and most importantly torsional vibrational modes.
Owner:THE BOEING CO
Method and device for detecting fundamental natural modes of vibration of an eye, by laser interferometry, and their use for measuring intraocular pressure
InactiveUS20040046937A1Less eye positioningReduce the required powerRadiation pyrometryInterferometric spectrometryIntraocular pressureOptical axis
The eye is positioned relative to a detection device in such a manner as to co-operate with the device to form a Fabry-Perot cavity having a main optical axis and comprising two opposite reflecting faces on the main optical axis, one of these two faces being constituted by a stationary reflecting element and the other being formed by the cornea of the eye. An incident laser beam is injected into said cavity so as to be centered on the main optical axis of the Fabry-Perot cavity, the cornea is aligned laterally and longitudinally relative to the main optical axis in such a manner as to obtain longitudinal interference between the go and the return laser beams reflected between the two reflecting faces of the cavity, and an optoelectronic detector is used to detect the intensity I of said interference as a function of time. The invention is applicable to measuring intraocular pressure.
Owner:CENT HOSPITALER & UNIV DE LILLE +3
Detection method and detection system of generator sub-synchronous resonance generator terminal damping controller
ActiveCN103105844AComprehensive testing of dynamic performanceSimulator controlElectric testing/monitoringSub synchronous resonancePower flow
The invention discloses a detection method and a detection system of a generator sub-synchronous resonance generator terminal damping controller. The detection method includes that electrical power system simulation environment, a 12-chain cascade H-bridge voltage source converter model and a boosting transformer of the 12-chain cascade H-bridge voltage source converter model are established, the electrical power system simulation environment provides electric signals for a control cabinet of the generator sub-synchronous resonance generator terminal damping controller, the control cabinet of the generator sub-synchronous resonance generator terminal damping controller generates window signals according to the electric signals, the window signals controls an insulated gate bipolar translator (IGBT) of each bridge of the 12-chain cascade H-bridge voltage source converter model to be powered on or powered off, a restraining sub-synchronous resonance damping current is generated and injected into a generator terminal of a generator model through the boosting transformer model, disturbance is arranged so as to stimulate the electrical power system simulation environment to generate sub-synchronous resonance of self natural mode of vibration, and the restraining effect of the sub-synchronous resonance of the restraining sub-synchronous resonance damping current to the self natural mode of vibration of the electrical power system simulation environment is detected.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +1
Structural damage early warning method based on empirical mode decomposition
ActiveCN103528844AThe result is intuitive and accurateEasy to operateStructural/machines measurementDecompositionEngineering
The invention relates to the field of structural damage recognition, in particular to a structural damage early warning method based on empirical mode decomposition. The method comprises the steps that a vibration transmissibility function is constructed by utilizing structural response; an amplitude value of the vibration transmissibility function serves as an analysis signal; a natural mode function is obtained by an empirical mode decomposition technology; a waveform index of the natural mode function is calculated by reference to a definition of a waveform index in a signal waveform processing technology; waveform indexes before and after structural damage are compared to judge whether a structure is damaged; and structural damage early warning is performed. The method is high in operability; the processing precision is improved; and the early warning accuracy is improved.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY
Safety evaluation method and system of blasting vibration based on energy input
InactiveCN102080945AEasy to calculateAccurate evaluationBlastingDiagnostic Radiology ModalityDecomposition
The invention relates to the field of safety of blasting vibration and aims to provide a safety evaluation method and system of blasting vibration based on energy input. The system comprises a blasting vibration safety evaluation module built-in a computer system. The method comprises the steps of: performing empirical mode decomposition for a signal of blasting vibration, extracting a function component of natural mode of vibration of a blasting vibration signal, performing Hilbert conversion for the function of natural mode of vibration of the blasting vibration signal and calculating the Hilbert instantaneous energy value of the signal; integrating the Hilbert instantaneous energy value and obtaining a total input energy TIE value; comparing the total input energy TIE value as a safety evaluation index of blasting vibration with a critical TIE index of a protected object in a safety evaluation index library module of blasting vibration to obtain the safety indication information. By using the TIE as the safety evaluation index of blasting vibration, the invention can perform more explicit and concise quantificational description for factors such as basic frequency, duration and the like and evaluate the influence of the blasting vibration more accurately, thereby avoiding the erroneous judgment of blasting vibration damage.
Owner:ZHEJIANG UNIV
Electroencephalogram characteristic extracting method based on DWT and EMD integrating CSP
InactiveCN108042132ASupport classificationResolve multiple inputsDiagnostic recording/measuringSensorsSupport vector machineFeature vector
The invention discloses an electroencephalogram characteristic extracting method based on DWT and EMD integrating CSP. The method comprises the steps of using obtained electroencephalograms as a training set and a testing set and preprocessing the electroencephalograms in channels selected in the training set and the testing set respectively; conducting wavelet decomposition on the electroencephalograms after being preprocessed to obtain sub-band signals after wavelet decomposition and selecting sub-band signals within a set frequency range; conducting empirical mode decomposition on the selected sub-band signals to obtain a natural mode function to obtain reconstructed signals; merging IMF components in the sub-band signals into a matrix, conducting public space mode decomposition on thematrix to obtain a space filter and obtaining characteristic vectors through the space filter; utilizing a support vector machine to conduct characteristic classification training on the characteristic vectors and inputting the preprocessed testing set into the trained support vector machine to classify characteristics to obtain a characteristic classification result. The problem of CSP is input many times and frequency domain information is lacked can be effectively solved.
Owner:NANJING UNIV OF POSTS & TELECOMM +1
Space Dampers for Four-Conductors Bundles
ActiveUS20180006443A1Reduce oscillationMaintaining distance between parallel conductorsDevices for damping mechanical oscillationsElectric power transmissionEngineering
A space damper for 4-cable bundles of overhead power transmission lines is disclosed, comprising a framework (10) where—from four support arms (20a-20b) depart, at the distal ends of which there are provided clamps for fastening electric cables, said arms (20a-20c) being constrained to the framework (10) through respective dampening hinges (30a-30c), wherein the spacer damper is configured so that the vertical, natural-mode frequencies thereof are higher than the corresponding horizontal, natural-mode frequencies thereof.
Owner:A SALVI & C SPA
Apparatus and method for suspending a stator core of an electric generator
InactiveUS7045918B2Easy constructionReliable to withstandMagnetic circuit stationary partsSupports/enclosures/casingsElectric generatorStator
Owner:ALSTOM TECH LTD
Double-ring reducer radiation noise numerical value simulation and study method
InactiveCN106777426AVerify accuracySpecial data processing applicationsVibration accelerationElement analysis
The invention discloses a double-ring reducer radiation noise numerical value simulation and study method. The method comprises the steps of firstly, establishing a power finite element analysis model of a reducer transmission system and structural system; secondly, applying ANSYS software to conduct natural mode of vibration and dynamic response numerical value simulation on a double-ring reducer; thirdly, with vibration displacement being a boundary condition, establishing an acoustic boundary element analysis model of a reducer case body; fourthly, using a direct boundary element method to calculate radiation noise of a case body surface sound pressure and field point in SYSNOISE software; fifthly, utilizing a transmission system test stand to conduct a vibration accelerated speed and radiation noise test on the double-ring reducer. According to the double-ring reducer radiation noise numerical value simulation and study method, gear internal dynamic incentive and an inertial incentive of an annular plate generated by a gear rigidity incentive, an error incentive and a meshing impact incentive are taken into comprehensive consideration, and a method with the combination of a finite element and a boundary element is adopted to conduct reducer dynamic response and numerical value simulation of radiation noise.
Owner:HEILONGJIANG HENGNENG SELF CONTROL TECH CO LTD
Bright line plot processing method and computer program product for bright line plot processing
InactiveUS20050063604A1Image enhancementCharacter and pattern recognitionUltrasound attenuationFilter effect
A bright line plot processing method of plotting a blight line which starts from the pixel at a bright point in an image to be processed is provided where a more natural mode of the cross filter effect can be applied to any digital photographic image. The bright line plot processing method comprises: a first bright line plotting step for generating an image of the bright line using a predetermined bright line definition format; a second bright line plotting step for generating data of the pixel at the bright point; a third bright line plotting step of generating data of each pixel for the bright line from the pixel data produced by attenuating the data of the pixel at the bright point at a predetermined attenuation rate along the lengthwise and / or widthwise direction of the bright line and the pixel data of the image to be processed; and a fourth bright line plotting step of plotting the data of the pixels for the bright line on the image to be processed.
Owner:NORITZ CORP
Longitudinal double-mode saw filter utilizing electrode finger phase weighting
InactiveUS6937116B2Improve performanceLength of device can be decreasedPiezoelectric/electrostriction/magnetostriction machinesImpedence networksElectrical conductorElectrical polarity
The invention provides a longitudinal double-mode SAW filter that has a large reflection coefficient by the electrode conductors and having flat pass band characteristics. In the longitudinal double-mode SAW filter, nearly all of higher-order natural mode oscillation displacements A0, S1 and A1 are made present in the first and second interdigital transducer regions. An electrode finger phase weighting is formed to correspond to a BPSK sign where a phase sign changes into 0 or π at a polarity-changing point on an electrode charge distribution function Q(x) that generates on the electrode due to natural modes of oscillation. A single pair of natural modes, which exist stationary in the direction X of propagation of the surface acoustic waves that are utilized, is selected. A symmetrical mode charge distribution (Q(x), −Q(x)) and an obliquely symmetrical mode charge distribution (Q(x), Q(x)) are generated in order to correspond to the regions of IDT1 and IDT2. The PTNG in the control IDT3 region is set to be in the range of 1.02 to 1.04 so as to couple the two together.
Owner:SEIKO EPSON CORP
Tibetan phrase input method based on jianpin
InactiveCN101788852AFunction increaseImprove input efficiencyInput/output processes for data processingPattern recognitionWord group
The invention relates to a Tibetan phrase input method, which mainly utilizes valid combination of Tibetan etymons and vowel characters to form codes, is suitable for various currently popular Tibetan input codes or keyboard layout, has the characteristics of few repeated codes, easy implementation, easy establishment and expansion of word stocks and the like, meets the natural mode of thinking of Tibetan writing, and can be understood and used easily.
Owner:JINAN UNIVERSITY
Method for operating a coriolis mass flowmeter
A method for operating a Coriolis mass flowmeter in which the interferences when calculating the medium parameters is considered by the eigenfrequency (f01) of the oscillation of the measuring tube being determined in the first and second natural modes during operation of the Coriolis mass flowmeter, and at least one medium parameter ({dot over (m)}) is calculated with the aid of the oscillation measuring variable (Δt) by means of a calculation rule representing a mathematic relation between the oscillation measuring variable (Δt), the medium parameter ({dot over (m)}) and the eigenfrequencies (f01, f02) of the oscillations of the measuring tube in the first natural mode and the second natural mode, and the medium parameter ({dot over (m)}) being determined taking into consideration the current determined eigenfrequencies (f01, f02) of the oscillations of the measuring tub in the first natural mode and the second natural mode as well as the oscillation measuring variable (Δt).
Owner:KROHNE MESSTECHNICK GMBH & CO KG
Vibration sensor-based vehicle recognition method
InactiveCN108197651AEasy to detectImplement classificationCharacter and pattern recognitionNeural learning methodsFeature vectorDecomposition
The invention discloses a vibration sensor-based vehicle recognition method, and aims at automatically recognizing vehicle types. The method comprises the following steps of: receiving a road surfacevibration signal caused by a vehicle by utilizing a vibration sensor; carrying out empirical mode decomposition on the acquired vibration signal to obtain a group of natural mode functions; multiplying the natural mode functions by different weights; summing the fixed mode functions to form a new signal; carrying out power spectrum analysis on the newly generated signal so as to obtain an MFCC feature vector; and training a BP neural network to obtain a new classifier for recognizing vehicle categories. The vehicle recognition method disclosed by the invention is strong in robustness and highin recognition rate, can be used for military vehicle classification and civil intelligent traffic systems, and has a broad prospect.
Owner:ZHEJIANG UNIV
Somatosensory control two-wheeled balance vehicle teaching aid system
The invention discloses a somatosensory control two-wheeled balance vehicle teaching aid system, relates to the technical field of two-wheeled balance vehicles, and a somatosensory control two-wheeled balance vehicle teaching aid combines somatosensory control with a two-wheeled balance vehicle form modern teaching aid equipment. A kinect somatosensory sensor of Microsoft enables information interaction between a man and a machine to completely get rid of traditional mouse and keyboard, game handle, remote controller and the like, and the most natural mode is utilized to have a conversation with the machine. At present no somatosensory control two-wheeled balance vehicle teaching aid exists. The somatosensory control two-wheeled balance vehicle teaching aid system provided by the invention provides a technology learning communication platform for learners, and is of great significance to education.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY
Liquid accumulator for compressor
InactiveCN110375465AReduce vibrationChange natural modeRefrigeration componentsVibration attenuationEngineering
The invention relates to the technical field of compressors, in particular to a liquid accumulator for a compressor. The liquid accumulator is provided with a cylinder body, one or multiple vibrationattenuation parts are arranged in the cylinder, through holes allowing fluid to pass through are formed in the vibration attenuation parts, the vibration attenuation parts are arranged in the liquid accumulator, vibration of the liquid accumulator can be restrained, meanwhile, the natural mode of the liquid accumulator can be changed, and the phenomenon that vibration of the compressor is transmitted to the liquid accumulator, the natural mode of the liquid accumulator is motivated, and abnormal noise is caused can be avoided.
Owner:SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
Fusion penetration control method of active shock excitation molten pool of multiple array lasers
ActiveCN104625414ANo problems with oscillation difficultiesImprove stabilityLaser beam welding apparatusImpulse frequencyLaser beams
The invention relates to a fusion penetration control method of an active shock excitation molten pool of multiple array lasers. An electric arc heats a molten pool, the dimension of the molten pool is gradually increased; meanwhile, a laser beam splitter emits multiple array lasers which are irradiated on the molten pool and provided with impact force with a certain frequency for the molten pool; the impact force leads to the amplitude change of the molten pool and causes the change of arc length and arc voltage, and changing curve of the arc voltage is collected by an oscilloscope; when the natural mode shape of the motel pool is consistent with the acting frequency of the array laser, the molten pool generates resonance oscillation, and its amplitude is the biggest, the voltage change amplitude is also the biggest, and the molten pool is grown up to the predetermined dimension; a computer control system controls the fusion penetration of a welding line in real time according to the voltage changing amplitude. The array laser impulse frequency is 1-1000 Hz. Through the array laser frequency, dimension of the resonated molten pool is determined, namely, the dimension of the molten pool is controlled through selecting the array laser frequency, and thus the fusion penetration of the welding line is controlled. Compared with the existing molten pool shock excitation method, the fusion penetration control method is high in precision, and good in stability and repeatability.
Owner:BEIJING UNIV OF TECH
Method and apparatus for detecting natural modes of vibration of an eye by laser interferometry, and an application thereof to measuring intraocular pressure
InactiveUS7441898B2Reduce the required powerLess eye positioningRadiation pyrometryInterferometric spectrometryOptical axisIntraocular pressure
Owner:CENT HOSPITALER & UNIV DE LILLE +3
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