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4176 results about "Vibration amplitude" patented technology
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Vibration is analogous to this . The amplitude depends on the amount of vibration, i.e, if the amplitude is small , when you touch the vibrating object you may feel a tickle. If it is large, it is possible to feel your whole hand is shaking.
Ultrasonic orthopedic surgical device with compound ultrasound vibration
InactiveUS20060030797A1Improve cutting efficiencyAvoid local accumulationChiropractic devicesEye exercisersVibration amplitudeDrive motor
An orthopedic surgical device with compound ultrasound vibration that comprises a handpiece, a surgical cutter fixed on the anterior top of the handpiece, and an ultrasound signal generator. Inside the outer casing of said handpiece, there are provided: an ultrasound transducer for transforming the ultrasound signals from said ultrasound signal generator into ultrasound mechanical waves; a horn (or amplitude transformer) for amplifying vibration amplitude of ultrasound mechanical waves generated from said transducer and then transmitting the amplified ultrasound mechanical waves to said surgical cutter to lead to longitudinal vibration of the surgical cutter; a driving motor fixed in the back end of said handpiece for driving said ultrasound transducer and horn to accomplish the movement of swing and rotation; an adapter provided between said driving motor and said transducer for supplying ultrasonic electrical signals generated by said ultrasound signal generator to said ultrasound transducer.
Owner:ZHOU ZHAOYING +3
Method and system for analysing tachometer and vibration data from an apparatus having one or more rotary components
ActiveUS7640802B2Avoid problemsEasy to getVibration measurement in solidsVehicle testingForce frequencyVibration amplitude
A method of analysing tachometer and vibration response data from an apparatus having one or more rotary components is provided. The method comprises the steps of: providing vibration response data and corresponding tachometer data from the apparatus for a period over which a rotary component of the apparatus varies in rotational speed, the tachometer data being for that component; repeatedly performing at intervals throughout the period the sub-steps of: determining a forcing frequency of the component from the tachometer data and a corresponding vibration response frequency of the apparatus from the vibration response data, comparing the forcing and vibration response frequencies to determine the relative phase difference between the frequencies, and determining the corresponding amplitude of the vibration response from the vibration response data; and plotting the relative phase differences and vibration amplitudes on a polar diagram. The plot trajectory is characteristic of the behavior of the apparatus over the period.
Owner:ROLLS ROYCE PLC +1
Method and system for analysing tachometer and vibration data from an apparatus having one or more rotary components
ActiveUS20070006636A1Avoid problemsEasy to getVehicle testingVibration measurement in solidsForce frequencyVibration amplitude
A method of analysing tachometer and vibration response data from an apparatus having one or more rotary components is provided. The method comprises the steps of: providing vibration response data and corresponding tachometer data from the apparatus for a period over which a rotary component of the apparatus varies in rotational speed, the tachometer data being for that component; repeatedly performing at intervals throughout the period the sub-steps of: determining a forcing frequency of the component from the tachometer data and a corresponding vibration response frequency of the apparatus from the vibration response data, comparing the forcing and vibration response frequencies to determine the relative phase difference between the frequencies, and determining the corresponding amplitude of the vibration response from the vibration response data; and plotting the relative phase differences and vibration amplitudes on a polar diagram. The plot trajectory is characteristic of the behaviour of the apparatus over the period.
Owner:ROLLS ROYCE PLC +1
Apparatus and method for the automated measurement of sural nerve conduction velocity and amplitude
ActiveUS20120101358A1Simplify the test procedureThe result is accurateSensorsSpecial data processing applicationsVibration amplitudeElectricity
Apparatus comprising a housing; stimulation means mounted to the housing; a biosensor releasably mounted to the housing, the biosensor comprising a plurality of electrodes for detecting a sural nerve response evoked by the stimulation means; acquisition means mounted to the housing and electrically connected to the biosensor for acquiring the sural nerve response; processing means mounted to the housing and electrically connected to the acquisition means for digitizing, processing and storing the acquired sural nerve response; calculation means mounted to the housing and electrically connected to the processing means for calculating the conduction velocity and amplitude of the processed sural nerve response; and display means mounted to the housing for displaying the sural nerve conduction velocity and amplitude; wherein the stimulation means and the biosensor are designed to be placed on a patient's anatomy, in the vicinity of a sural nerve, by manipulating the housing.
Owner:NEUROMETRIX INC
Device for monitoring state of power transmission line tower-line system
InactiveCN102042885AWide operating temperature rangeLong measuring distanceForce measurement by measuring optical property variationIndication of weather conditions using multiple variablesVibration amplitudeDistributed structure
The invention discloses a device for monitoring the state of a power transmission line tower-line system, which fully utilizes the advantages of corrosion resistance, wide operation temperature range, anti-electromagnetic interference, passivity, long measuring distance, reliable operation and long service life and the like of optical fiber sensors to configure the optical fiber sensors on a transmission conductor and a tower in a quasi-distributed structure for detecting the temperature, the strain and the acceleration of the transmission conductor and the multipoint stress variation on the tower which are transmitted to an optical modulator demodulator for demodulating and are sent to a computer analyzing and processing system for calculating to obtain the icing quality, the waving amplitude, the breeze vibration amplitude and frequency and the sag of the transmission conductor, and the inclination angle of the tower, thus realizing the simultaneous monitoring on the icing, the waving, the breeze vibration and the sag of the transmission conductor, and the inclination angle state of the tower, and being capable of finishing long-time reliable operation under the on-site severe environment conditions.
Owner:SICHUAN HUIYUAN OPTICAL COMM CO LTD
Pumping system, vibration limiting device, and method
ActiveUS20170335842A1Positive displacement pump componentsPiston pumpsVibration amplitudeEngineering
A mechanism for limiting vibration amplitudes in a pumping system includes a plurality of pendulum absorbers coupled with a carrier and each having a pivoting range. The pendulum absorbers each further include a first and a second contact surface that contacts an outer peripheral surface of the carrier at limit stop positions, and each having a shape that is conforming with a shape of the outer peripheral surface. The pumping system may be used for pumping liquid nitrogen.
Owner:CATERPILLAR INC
Marine acoustic vibrator having enhanced low-frequency amplitude
InactiveUS20110317515A1Seismic energy generationSound producing devicesVibration amplitudeSeismic survey
A seismic source includes a flextensional shell defining a longer axis and a shorter axis and at least one driver coupled to the flextensional shell proximate an end of the shorter axis. The seismic source may be a component of a marine seismic survey system. The marine seismic survey system may be utilized in a method of marine seismic surveying.
Owner:PGS GEOPHYSICAL AS
Concrete pump truck, damping device and method for concrete pump truck arm support
ActiveCN102071809ASimple structureGood vibration reduction effectPump controlPumpsVibration amplitudeControl signal
The invention provides a concrete pump truck, a damping device and a damping method for a concrete pump trunk arm support. The damping device of the concrete pump trunk arm support comprises a damping control unit, an arm support tail end vibration monitoring unit and an arm support posture monitoring unit, wherein the damping control unit is connected with an electromagnetic proportional value connected with an arm support cylinder; the arm support tail end vibration monitoring unit monitors amplitude parameters of a tail arm of the arm support and transmits amplitude parameter signals to the damping control unit; and the arm support posture monitoring unit monitors angle parameters of the arm support and transmits angle parameter signals to the damping control unit. The concrete pump truck also comprises the damping device of the concrete pump truck arm support. The damping method for the concrete pump truck arm support comprises the following steps of: monitoring operation parameters of a concrete pump and the arm support; generating control signals according to monitoring parameters; and outputting an electromagnetic proportional valve control current according to the control signals to control a piston position of the arm support cylinder, wherein the monitoring parameters of the arm support comprise the vibration amplitude parameters of the tail arm of the arm support and the angle parameters of the arm support.
Owner:ZOOMLION HEAVY IND CO LTD
Gas turbine combustor, and gas turbine with the combustor
ActiveUS20050223707A1Reduce vibrationReduce NOxContinuous combustion chamberEngine fuctionsVibration amplitudeCombustor
In order to realize a stable decrease in NOx, a gas turbine combustor is supplied which can reduce combustion vibration. A combustor (3) is provided with a first box body (30), which is installed outside an object body (20) such as a combustor basket (6), a transition piece (7) or a bypass duct (11) so as to form a first internal space (31) having a predetermined capacity; and a first throat (32) having a predetermined length which has one end (32a) open to a side wall (20a) of the object body (20) and has the other end (32b) open to a first internal space (31); wherein, a first resistive element (33) having a multiple number of through-holes is inserted and engaged to one end (32a). Fluid particles serving as vibration elements of combustion vibration caused in a combustion region are effectively trapped by the first resistive element (33) and at the same time resonate with the air of the first internal space (31) being connected through the first throat (32) and vibrate in the neighborhood of the first resistive element (33), thereby damping vibration amplitude thereof.
Owner:MITSUBISHI POWER LTD
Method and apparatus for true relative amplitude correction of seismic data for normal moveout stretch effects
InactiveUS7230879B2Seismic signal processingSpecial data processing applicationsRelative magnitudeVibration amplitude
The present invention provides a method and apparatus for arriving at true relative amplitude destretched seismic traces from stretched seismic traces. The method compensates for offset varying reflection interference effects due to normal moveout. Stretch factors β and also input spectra are determined for NMOR stretched seismic traces. Estimates are then made of stretched wavelet spectra from the input spectra. A destretched wavelet spectra is then obtained. Shaping correction factors are determined by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra and are applied to the input spectra of the stretched traces to arrive at a destretched trace spectra. True relative amplitude scaling factors are computed by taking the ratio of a true relative amplitude property of the destretched wavelet spectra to a corresponding true relative amplitude property of the stretched wavelet spectra. Finally, the true relative amplitude scaling factors are applied to the destretched trace spectra to arrive at true relative amplitude destretched seismic traces.
Owner:CHEVROU USA INC
Vibrating screen
InactiveCN104646281AImplement location changesThe role of control screeningSievingScreeningVibration attenuationVibration amplitude
The invention relates to a vibrating screen. The vibrating screen comprises a foundation support, a horizontal vibration attenuation mechanism, a vertical supporting mechanism, a horizontal guide rail, a bracket and a motor, wherein the foundation support is provided with a horizontal supporting part and vertical supporting parts, and the vertical supporting parts are arranged on two ends of the horizontal supporting part; the horizontal vibration attenuation mechanism is connected with the vertical supporting parts of the foundation support; the vertical supporting mechanism is connected with the horizontal supporting part of the foundation support; the horizontal guide rail is respectively connected with the vertical supporting parts and the horizontal supporting part of the foundation support through the horizontal vibration attenuation mechanism and the vertical supporting mechanism; the bracket is used for fixing a screen assembly, and the bracket can be movably fixed on the horizontal guide rail through a slide block; the motor is installed on the foundation support, and a rotating shaft of the motor is connected with the slide block through a crank linkage mechanism. According to the vibrating screen of the invention, a spring is uniformly stressed, the service life is prolonged, and the vibration amplitude of the screen assembly can be conveniently adjusted.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Digital signal processing method and device for micro-mechanical gyroscope
InactiveCN102109345ASpectrum pureHigh frequency resolutionSpeed measurement using gyroscopic effectsTurn-sensitive devicesDigital signal processingVibration amplitude
The invention relates to a digital signal processing method and a device for a micro-mechanical gyroscope. The device mainly comprises a digital signal processor, a direct digital frequency synthesizer, a digital phase-locked loop and an analog-to-digital converter. The frequency synthesizer is used for outputting a sine drive signal with controllable frequency and amplitude. A drive feedback signal and an angular velocity readout signal are synchronously converted by the analog-to-digital converter; the converted frequency is an integral multiple of the frequency of the drive signal, and thesampling time length is an integral multiple of the period of the drive signal. With the adoption of the digital signal processor, the sampling data is multiplied by the fixed sine and cosine coefficients, and the input angular velocity and the orthotropic error as well as the phase and the amplitude of the drive feedback signal are resolved in an accumulative manner, and the phase parameters areutilized for adjusting the frequency of the drive signal, so that the frequency of the drive signal follows up the resonance frequency of the gyroscope. The amplitude parameters are utilized for adjusting the amplitude of the drive signal, so that the vibration amplitude is constant. The device realizes the drive of the micro-mechanical gyroscope and the digitization of the angular velocity demodulation, has simple structure and high computation precision, and is easy to produce and transplant in batch.
Owner:谢元平
Lithium ion battery lead ultrasonic welding method and lead welding protection method
ActiveCN107671414AMetal working apparatusNon-electric welding apparatusVibration amplitudeUltrasonic welding
The invention relates to a lithium ion battery lead ultrasonic welding method and a lead welding protection method. A protection piece is arranged on an overlaid lead foil piece ultrasonic welding area, and a welding head of an ultrasonic welding device is pressed on the protection piece for ultrasonic welding. The protection piece is arranged on overlaid lead foil pieces, and the protection piecemakes direct contact with the welding head so as to bear ultrasonic vibration of the welding head and transmit vibration to the lead foil pieces; through arrangement of the protection piece, the leadfoil pieces can be prevented from being broken under vibration; through arrangement of the protection piece, the ultrasonic welding parameters such as energy, pressure and vibration amplitude can beadjusted to be slightly high correspondingly, so that the welding effect is improved and welding is firmer, and the effect on batteries with few lead foil piece layers is particularly obvious; and through arrangement of the protection piece, the surfaces of leads are free of damage, and the consistency of the welding effect is high.
Owner:CHINA AVIATION LITHIUM BATTERY LUOYANG
Method and apparatus for operating a gas turbine engine
InactiveUS20070250245A1Easy to identifyVibration measurement in solidsAnalogue computers for vehiclesVibration amplitudeTurbine
A method for operating a gas turbine engine includes coupling at least one sensor within the gas turbine engine to transmit a signal indicative of a vibration level of a rotor assembly within the gas turbine engine, detecting the vibration level of the rotor assembly based on the signal transmitted from the at least one sensor, comparing the detected vibration level to a predetermined vibration threshold, and generating an output if the detected vibration amplitude exceeds the threshold amplitude for a predetermined duration to facilitate identifying a gas turbine engine impulse event.
Owner:GENERAL ELECTRIC CO
On-line monitoring method for vibration and noise of AC power transformer influenced by DC magnetic biasing
ActiveCN101246043ASafe and stable operationVibration measurement in solidsElectrical testingVibration amplitudeTransformer
The present invention relates to a method for on-line monitoring the vibration and noise of the alternating-current power transformer which is affected by the direct-current magnetic biasing, and the method belongs to the electric power safety monitoring technique in the electric field, and the method comprises the following steps: when the direct-current magnetic biasing does not exist collecting the noise acoustic pressure signal of the noise sound pressure meter at the transformer position to confirm the vibration signal monitoring point, and recording the principal character data of vibration of transformer body when no direct-current magnetic biasing exists at the monitoring point; when the direct-current magnetic biasing state appears executing on-line monitoring according to the sampling interval, sampling frequency and monitoring period, and setting the monitoring threshold value of the maximum vibration amplitude; after each monitoring period analyzing the preserved raw data, when the early warning state appears steadily for more than one day continuously, the transformer body is needed to be further detected, otherwise, the operation state of the transformer is taken for excellent; the invention can realize the judgment to the vibration state of the transformer at the state of direct-current magnetic biasing and guarantee the safe and stable operation of the power transformer through long-period on-line monitoring.
Owner:TSINGHUA UNIV
Active control system and method for reducing disk fluttering induced track misregistrations
InactiveUS6888694B2Easy to mergeNot affect stability of systemTrack finding/aligningRecord information storageVibration amplitudeVertical vibration
The present invention relates to controlling an actuator for positioning a read / write head in storage devices such as disk drives. More specifically, the invention relates to using a sensor to detect the disk vibration amplitude perpendicular to the disk surface, and using feed forward control to cancel or counteract the tendency of the read / write head to deviate off-track due to disk vibration. Various approaches are proposed to detect the disk vertical vibration.
Owner:AGENCY FOR SCI TECH & RES
Piezoelectric actuator
InactiveUS20060159295A1Easy to controlReduce the impactPiezoelectric/electrostriction/magnetostriction machinesPiezoelectric/electrostrictive transducersVibration amplitudeResonance
A piezo-electric actuator is provided which is capable of providing large vibration amplitude, is adjustable for resonance frequency, and has high reliability while avoiding an increase in outer dimensions. A piezo-electric actuator comprising: piezo-electric element la having piezo-electric body 3a which is provided with at least two opposing surfaces, wherein the surfaces perform an expanding and contracting motion in accordance with the state of an electric field; a constraint member 21a for constraining piezo-electric element 1a on at least one of the two surfaces, a supporting member disposed around constraint member 21a, and a plurality of beam members 22a each having both ends fixed to constraint member 21a and supporting member 4a, respectively, wherein each beam member has a neutral axis for bending in a direction substantially parallel with the constrained surface, wherein the constraint member vibrates by vibration which is generated by the constraining effect between the constraint member and the piezo-electric element, and is amplified by the beam members.
Owner:NEC CORP
High-frequency vibration motor for electric toothbrush
ActiveCN102111032AReduce in quantityReasonable structureMechanical energy handlingTooth cleaningVibration amplitudeReciprocating motion
The invention relates to the technical field of electric toothbrushes, in particular to a high-frequency vibration motor for an electric toothbrush. The high-frequency vibration motor for the electric toothbrush comprises a shell and a rear cover, wherein a stator, a rotating shaft and an adjusting pad are arranged in the shell; the output end of the rotating shaft is connected with the rear cover through a spring piece; the spring piece comprises a spring piece main body and an elastic arm; the motor generates power to drive the rotating shaft to rotate reciprocally so as to drive the springpiece connected with the rotating shaft to twist to generate torsional deformation; when the frequency of the motor generating reciprocating movement is close to or reaches the torsional resonant frequency of the spring piece, the torsional vibration amplitude of the spring piece reaches the maximum so that the swinging amplitude of the motor reaches the maximum; because of the influence of the reluctance force of the motor per se, the vibration amplitude of an overall system reaches a balanced state, and the spring piece and the motor generate movement under the balanced condition. The high-frequency vibration motor for the electric toothbrush is easy to manufacture and position, along with reasonable structure, less elements, simple machining process, low cost and long service life.
Owner:DONGGUAN LEBOND ELECTRONICS TECH CO LTD
Flexible tube
InactiveUS6848478B2Limitation of vibration amplitudeLarge inner diameterExhaust apparatusSilencing apparatusVibration amplitudeEngineering
A small-diameter part in the vicinity of a center of a bellows portion in an axial direction has a smaller diameter. A tip end of the small-diameter part contacts at a point A with an outer peripheral face of an interlock pipe. The interlock pipe vibrates with using the point A and points B in both ends as fulcrums. The addition of the point A reduces distance between the fulcrums. In accordance with this reduction, deflection amount of the interlock pipe is reduced and vibration amplitude of the interlock pipe is decreased. Therefore, the interlock pipe does not contact with the bellows portion so that troubles such as noises can be prevented from occurring.
Owner:CALSONIC KANSEI CORP
Sonoelastography using power Doppler
InactiveUS20050054930A1Wave based measurement systemsOrgan movement/changes detectionVibration amplitudePerformed Imaging
A technique for imaging relative elastic properties combines B-scan and power Doppler signals to produce images of relative vibration amplitude. A method for imaging relative elastic properties of tissue includes vibrating an area of tissue of interest and capturing a power Doppler image of at least part of the vibrating tissue.
Owner:UNIV COURT OF THE UNIV OF DUNDEE
Great structure horizontal two-dimensional displacement automatic measuring equipment and method
InactiveCN101339003AReduce transmittanceEasy to observeSurveying instrumentsUsing optical meansVibration amplitudeMeasurement device
The invention provides a large structure horizontal planar displacement automatic measuring device and a method thereof. The automatic measuring device consists of a laser alignment emitter, a natural light filtration drone, a light spot position collection device, and a computer in which measuring software and database are installed. The natural light filtration drone is connected with the computer by the light spot position collection device. The laser alignment emitter consists of a flexible connection device and a shield, thus constituting a self-erect structure. The light spot position collection device transmits the collected variations in light spot colors, shapes and gradients to the computer which processes the variations and outputs measurement results. The large structure horizontal planar displacement automatic measuring device is applicable for detection and monitoring of distortion and movement of such large structures as bridges, cable support towers or buildings and so on. Vibration frequency, vibration amplitude of a point at any time can be detected and monitored. The automatic measuring device can be used for measuring and computing static and dynamic displacement and distortion, as well as computing and evaluating long-term displacement, distortion, and change trend thereof. The automatic measuring device has the characteristics of quick measurement, great interference rejection, high stability and so on.
Owner:CHONGQING JIAOTONG UNIVERSITY
Gimbal device of rolling drum-type washing machine
ActiveCN101962901AReduce noiseLow costOther washing machinesTextiles and paperVibration amplitudeLow noise
The invention discloses a gimbal device of a rolling drum-type washing machine. The gimbal device comprises at least two annular chambers which are in coaxial with a rolling drum and are arranged at the edge of the rolling drum, wherein at least one chamber is a sphere gimbal provided with a grounder; and at least one chamber is a liquid gimbal provided with flowing liquid. The two different counterweights of the grounder and the liquid are utilized for respectively generating at least two counterbalances with different reaction speeds, thereby improving equilibrium state of rotation when the rolling drum of the washing machine dehydrates. When the rotation speed is less than the point of resonance of the rolling drum and an outer drum, the liquid gimbal absorbs vibration. When the rotation speed exceeds the point of resonance and is stabilized, the sphere gimbal generates high degree of vibration to absorb the vibration of the outer drum. For offset exceeding sphere volume, the liquid gimbal absorbs the vibration. The gimbal device can restrain vibration amplitude of the outer drum when starting and stably rotating, and realizes the purposes of low vibration, low noise and low cost.
Owner:QINGDAO HAIER WASHING MASCH CO LTD
Vibrator
InactiveUS20070194635A1Repeater circuitsMechanical vibrations separationVibration amplitudeAlternating current
A vibrator includes a voice coil and a vibrating member that vibrates along the axial direction of the voice coil when it is excited by application of an alternating current thereto. A suspension supports the vibrating member vibratably in the axial direction. A casing houses the voice coil, the vibrating member, and the suspension. A buffering member is provided so that the vibrating member strikes the buffering member when the vibration amplitude of the vibrating member has exceeded a predetermined value in a resonance region around the resonance point of the vibrating member.
Owner:CITIZEN ELECTRONICS CO LTD
Combined accelerometer and gyroscope system
InactiveUS7765869B2Acceleration measurement using interia forcesSpeed measurement using gyroscopic effectsVibration amplitudeAccelerometer
Owner:KONKUK UNIV IND COOP CORP
Spherical contact type friction characteristic testing device under ultrasonic vibration
InactiveCN103278411APrecise control of test parametersHigh degree of automationUsing mechanical meansInvestigating abrasion/wear resistanceRotary stageVibration amplitude
The invention discloses a spherical contact type friction characteristic testing device under ultrasonic vibration. The device consists of a main movement unit, a loading unit and a dynamometer unit, wherein the torque output by a step motor is converted into axial pressure of a sliding table through a lead screw nut pair of a trapezoidal screw, and an upper sample and a lower sample which are arranged at the bottom of a piezoelectric micromachined ultrasonic transducer are contacted with each other, and certain pressure is applied to the lower sample; when the piezoelectric micromachined ultrasonic transducer is connected with an ultrasonic power supply, the upper sample produces ultrasonic frequency vibration with micron-grade amplitude in the horizontal direction or the vertical direction, the lower sample rotates together with a rotating platform and forms a friction pair with the upper sample, so that the friction characteristic of the spherical contact under ultrasonic vibration can be tested. The device can be used for accurately controlling the testing parameters, is high in degree of automation, and can be used for performing spherical contact friction experiments of various types of friction materials under different ultrasonic vibration frequencies and vibration amplitudes.
Owner:JILIN UNIV
Mitigation of RF Oscillator Pulling through Adjustable Phase Shifting
InactiveUS20100283665A1Wave based measurement systemsSubstation equipmentVibration amplitudeSelf interference
A digitally controlled mechanism for the minimization of the self-interference caused by an amplitude modulated signal generated within a polar transmitter to the oscillator circuit, where the carrier of that transmitter is created. A digitally controlled delay between the circuit where the signal is generated and the circuit where it is amplitude-modulated allows adjustment of the delay or phase-shift between the aggressing and victim signals. The optimal delay that is to be introduced in the path is determined, and a corresponding control word is generated to arrive at the selected delay / phase-shift.
Owner:TEXAS INSTR INC
Use of an accelerometer to control vibrator performance
InactiveUS8084968B2Motor/generator/converter stoppersDC motor speed/torque controlVibration amplitudeAccelerometer
Owner:SONY ERICSSON MOBILE COMM AB
Method to mitigate bit induced vibrations by intentionally modifying mode shapes of drill strings by mass or stiffness changes
A method for reducing drill tubular vibrations includes: constructing a mathematical model the drill tubular having mass distribution, material stiffness and material damping; constructing an equation of motion of the drill tubular in one of a time domain and frequency domain; transforming the equation of motion into a modal domain equation of motion to provide a mode shape of the drill tubular at an eigenfrequency, the mode shape providing an amplitude at a position along the drill tubular; comparing the amplitude at the position along the drill tubular to a threshold amplitude value; modifying at least one of the mass distribution, material stiffness and material damping if the amplitude exceeds the threshold value; and iterating the above step until at least one of the amplitude of the latest mode shape at the position is less than or equal to the threshold amplitude value and a predetermined constraint limits the modifying.
Owner:BAKER HUGHES INC
Steam-electric generating set rotor thermal bending unbalance fault real time diagnostic method
InactiveCN101451898AMethod scienceConclusion scienceStatic/dynamic balance measurementVibration amplitudeAxial vibration
The invention discloses a real time diagnosing method for turbo unit rotor thermal bending malfunctions. The method processes the calculation, analysis and judgments for the vibrating data via collecting the rotor vibrating signals of the turbo unit; and the method processes the real-time calculation of storage on both sides of the rotor shaft relative vibration frequency of vibration amplitude and phase values, and real-time axis vibration frequency of vibration amplitude in real-time authentication, determine any side of the rotor shaft vibration amplitude of the vibration frequency is greater than the vibration amplitude threshold. Then the method is combined with least square method, based on the axial vibration frequency of vibration data axis vibration frequency of the vibration amplitude of the trend of flat-based authentication and shaft vibration frequency vibration phase of verification, such as the trend of moderate real-time quantitative calculation and analysis. Calculated in real-time quantitative analysis based on the combined results of the verification, automatic real-time diagnosis of whether units imbalance rotor thermal bending failure. The invention has the advantages of scientific method; reliable conclusions can automatically real-time online monitoring, fault diagnosis and so on.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Adaptive threshold waveform peak valley identification method and device
ActiveCN101361652AHigh waveform recognition rateImprove anti-interference abilityCatheterAngiographyVibration amplitudeSmall amplitude
The invention discloses a waveform peak and trough identifying method with self-adapting threshold and a device thereof. The identifying method comprises following steps: A1. multilevel amplitude thresholds are set up, including a smallest amplitude threshold Ymin, a largest amplitude threshold Ymax, a threshold step length S and a threshold level N, N equals to the result of Ymax subtracted by Ymin then divided by S, and finally added by 1, and the nth level amplitude threshold Yn equals to Ymin added by the result of n subtracted by 1 and then multiplied by S; B1. information of local wave peaks and local wave troughs in the waveform is searched; C1. a threshold of vibration amplitude of the local wave peaks or the local wave troughs is determined, and if the vibration amplitude of the local wave peaks or the local wave troughs is more than a certain amplitude threshold, the vibration amplitude is taken as a threshold wave peak or a threshold wave trough of the amplitude threshold in the level; D1. vibration amplitude threshold and time threshold of the threshold wave peaks and the threshold wave troughs are determined, and effective wave peaks and effective wave troughs are determined. The waveform peak and trough identifying method with self-adapting threshold and the device thereof have high wave form identifying rate, improved disturbance resisting capacity and increased clinical limitation of wave trough identification, and is fit for real clinical situations.
Owner:SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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