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2543 results about "Vibration exciter" patented technology

Vibration-type measuring transducer

For conveying a fluid, the measuring transducer is equipped with a measuring tube, which is held oscillatably in a support element and vibrates during operation. The measuring tube executes, during operation, at least over part of its length, driven by an exciter arrangement, bending oscillations about an oscillation axis. These bending oscillations predominantly assume an oscillation form having at least three bending oscillation antinodes. Inlet-end and outlet-end oscillations are registered by means of a sensor arrangement. Additionally provided in the measuring transducer is a coupler arrangement connected with measuring tube and with support element and having at least one coupling element interacting mechanically, especially resiliently, with the vibrating measuring tube and the support element. By suitable choice of the effective spring constant, c60, of the coupler arrangement, this can cancel transverse forces produced, during operation, on the part of the vibrating measuring tube, for example due to fluctuating fluid density.
Owner:ENDRESS HAUSER FLOWTEC AG

Coriolis flowmeter

When outputs from two vibration detection sensors are measured by a Coriolis flowmeter in a form of phase difference time, a tube must be thinned to increase a sensitivity of the flowmeter to enable measurement and accordingly flow velocity and pressure loss increase, and a thickness of the flowmeter must be reduced and therefore a pressure resistance cannot be readily enhanced. In particular, the sensitivity of signals to flow rate is difficult to increase and, accordingly, a flow rate of a low-density gas cannot be accurately measured. In the present invention, a Coriolis vibration frame 16 carrying a U-shaped tube is swingably fixed to a forced vibration frame 19 fixed to a support base 22 to form a highly rigid frame structure limiting a vibrating direction to one degree of freedom in a Coriolis vibration direction. The forced vibration frame 19 is vibrated by a vibration exciter 20 so that a ratio of a forced vibration frequency to the Coriolis frequency of a pipeline is at least 1 to 10. The ratio of the amplitude of the forced vibration to the amplitude of the Coriolis vibration is calculated based on signals from two vibration sensors such as acceleration sensors 17 and 18 to measure the mass flow rate of a fluid flowing in the pipeline.
Owner:NAT INST OF ADVANCED IND SCI & TECH

Method for testing assembly performance of rotor of aircraft engine

The invention discloses a method for testing the assembly performance of a rotor of an aircraft engine, which comprises the following steps of: firstly exciting and vibrating a rotor of an aircraft engine with a vibration exciter; obtaining a multiple carrier-coupled impulse response signal of the rotor of the aircraft engine with a vibrating sensor and signal-acquiring system software; analyzing the obtained multiple carrier-coupled impulse response signal of the rotor of the aircraft engine by means of dual-tree complex wavelet transform to obtain eight signal carrier-coupled impulse response signals of the rotor of the aircraft engine; and distilling the average assembly performance index of the obtained eight signal carrier-coupled impulse response signals of the rotor of the aircraft engine, wherein the assembly performance of the rotor of the aircraft engine is judged to be qualified if the obtained average assembly performance index is larger than or equal to 10, and the assembly performance of the rotor of the aircraft engine is judged not to be qualified if the obtained average assembly performance index is less than 10, so that the rotor needs to be repaired.
Owner:XI AN JIAOTONG UNIV

Trim panel comprising an integral acoustic system

A trim panel, e.g., a roof lining for a vehicle passenger compartment, characterized in that the trim panel comprises an integral acoustic radiator and a vibration exciter mounted on the radiator to launch bending waves into the radiator to cause it to resonate to produce an acoustic output. The acoustic radiator has a periphery which is integral with the radiator and the trim panel.
Owner:GOOGLE LLC

Dynamic characteristic parameter test device and method of sliding guide rail junction surface

The invention relates to a dynamic characteristic parameter test device of a sliding guide rail junction surface, which can be simplified into a single degree of freedom system. The device comprises a base, an installation platform, a fixed guide rail, a wedge-shaped block, an inlaid strip, a sliding block, a plurality of piezoelectric type acceleration sensors, a vibration exciter, an elastic rope, an impedance head, a stand, a normal force applying bolt, a rubber ring, a charge amplifier, a data acquisition unit, a power amplifier and an electronic computer. Compared with the prior art, thedynamic characteristic parameter test device has the advantages that: the structure is compact, the test principle is distinct, dynamic characteristic parameters of the junction surface under different load states can be measured by adjusting the pretightening force of a normal force applying bolt, the vibration exciting force direction passes through the gravity of the sliding block during measurement so that vibration signals of the sliding block and the base can be measured simultaneously, the influence of the vibration signals of the base is eliminated when a frequency response function of a system is calculated, and the characteristics of high efficiency, high stability and high precision are achieved.
Owner:NANJING UNIV OF SCI & TECH

Touch sensitive device

A touch sensitive device comprising a panel capable of supporting bending waves, a user-accessible touch sensitive screen on or forming part of a face of the panel, the touch sensitive screen having a plurality of different sensing areas, a plurality of vibration exciters coupled to the panel to apply bending waves to the panel to provide tactile feedback at the plurality of sensing areas in response to the user touching a sensing area, and signal processing means arranged to apply signals to the vibration exciters so as to steer bending waves applied to the panel by the plurality of vibration exciters whereby the amplitude of the applied bending waves is maximized at the sensing area touched by the user and reduced or minimized at each other sensing area.
Owner:GOOGLE LLC

Thin-walled structure part vibration test device and method based on piezoelectric ceramic vibration exciter

The invention belongs to the technical field of vibration test, in particular to a thin-walled structure part vibration test device and a method based on a piezoelectric ceramic vibration exciter. The device comprises a signal generator, a piezoelectric ceramic drive power supply, a piezoelectric ceramic vibration exciter, a feedback attenuator, a laser vibration meter, a data acquisition analyzer and an upper computer. The method comprises the steps of performing modality test on a thin-walled structure part, determining a linear relationship between excitation voltage and critical excitation frequency of the signal generator and calibrating an excitation force of the piezoelectric ceramic vibration exciter based on a cantilever theory. According to the device and the method, an excitation signal can be effectively acquired; the magnitude of the excitation force when the piezoelectric ceramic vibration exciter excites the structure part is defined; the stable designated excitation force and the linear excitation signal of the excitation frequency can be generated; influencing factors of non-linear piezoelectric ceramic excitation are effectively eliminated; the piezoelectric ceramic vibration exciter is adopted to realize high-frequency vibration excitation; additional mass is low; and the device is convenient to use.
Owner:NORTHEASTERN UNIV

Drilling rig with following pipe pile and construction method for following pipe pile

Disclosed are a drilling rig for drilling with a following pipe pile and a construction method for the following pipe pile. The drilling rig is provided with a chassis, a platform, a cab, a power system, a hydraulic system, a control system, upright columns, supporting rods, a vertical winch, a power head, a soil discharge box, a spiral drill stem assembly, a reamer bit, a vibration exciter, an adjusting cylinder, a manned hanging basket, a hanging basket winch, a pressurizing winch, an auxiliary winch and a pile controller, wherein the platform, the cab, the power system, the hydraulic system and the control system are located on the chassis, the upright columns and the supporting rods are mounted on the platform, and the auxiliary winch is used for hoisting heavy objects. The construction method for the following pipe pile comprises following steps: leveling the pile controller after the pile controller is aligned with a pile location and adjusting verticality of upright columns of the drilling rig; mounting a prefabricated pipe pile and a drill and leading the reamer bit to penetrate out of the lower end surface of the prefabricated pipe pile; forwards rotating the power head, leading a reamer wing of the reamer bit to be opened to begin to realize reamer drilling and leading the prefabricated pipe pile to be jacked in afterwards; backwards rotating the power head after a preset depth is achieved, withdrawing the reamer wing of the reamer bit to be closed, lifting out the reamer wing of the reamer bit from the inside of the prefabricated pipe pile and starting the vibration exciter to impact the prefabricated pipe pile; and realizing grouting piling for the sides and the bottom of the pile.
Owner:SUNWARD INTELLIGENT EQUIP CO LTD +1

System and method for measuring time-sharing quick steady-state sine sweep excitation frequency response function

InactiveCN101561342AEasy to operateLarge excitation powerVibration testingShielded cableData acquisition
The invention relates to a system and a method for measuring time-sharing quick steady-state sine sweep excitation frequency response function, which belong to the technical field of vibration tests. An excitation system adopts a vibration exciter and a power amplifier. A force sensor and a vibration sensor are adopted to measure an exciting force signal and a vibratory response signal of the system at the same time. A charge amplifier is adopted to condition and filter the signals. A data acquisition system connects a data acquisition card with a connecting terminal through a high-performance shielded cable and is connected with a general computer to acquire and send data. The generation of a sweep signal and the data processing, analysis, storage and display of an exciter response signal are achieved by adopting software based on the general computer. The system and the method achieve quick steady-state sine sweep excitation, the complete cycle sampling of the exciter response signal, and precise and reliable frequency response function curve. The test system is guided by computer programs and is finished automatically, the test method is precise and reliable, and the system and the method have important meaning on testing the dynamic properties of structural elements.
Owner:BEIJING UNIV OF TECH

Device and method for detecting pipeline closed cracks based on vibro-acoustic modulation technology

The invention relates to a device and a method for detecting pipeline closed cracks based on the vibro-acoustic modulation technology and belongs to the pipeline nondestructive testing field. The device provided by the invention comprises a computer, a first function generator, a second function generator, a first power amplifier, a second power amplifier, a vibration exciter, an accelerometer, acharge amplifier, a first thickness concertina-type piezoelectric ceramic sheet array and a second thickness concertina-type piezoelectric ceramic sheet array, an anti-aliasing filter and a data collection card. The method provided by the invention comprises the following steps of: acquiring a pipeline first-order bending vibration inherent frequency by swept frequency excitation; taking the frequency as the one of low-frequency vibration in the vibro-acoustic modulation detection; simultaneously exciting low-frequency bending vibration and high-frequency supersonic waves into the pipeline, determining whether there exists closed cracks inside the pipeline by the existence of frequency components which equal high frequency supersonic wave frequency subtracts or adds low frequency bending vibration frequency in a received signal frequency spectrogram. The device provided by the invention is utilized to solve the problem that it is hard to detect closed cracks by traditional methods, and can be applied to detect closed cracks in industrial pipelines.
Owner:BEIJING UNIV OF TECH

Micro-movement friction and abrasion testing machine

InactiveCN103063530AThe excitation amplitude is adjustableAdjustable vibration modeUsing mechanical meansInvestigating abrasion/wear resistanceClosed loop feedbackEngineering
The invention discloses a micro-movement friction and abrasion testing machine. The micro-movement friction and abrasion testing machine is that two symmetrically arranged electric vibration exciters are adopted and used as excitation sources for generating micro-movement friction between friction pairs; a loading device is adopted and used for applying positive pressure to the friction pairs; a force sensor is adopted and used for collecting a positive pressure signal; a computer data processing device is arranged and produces a closed-loop feedback control together with the acquired positive pressure signal, and the load applied by the loading device is kept constant. In addition, the computer data processing device is used for recording and analyzing the positive pressure signal acquired by the sensor, a micro-movement friction force signal, and a displacement signal, acquired by a displacement sensor, of each electric vibration exciter and then are automatically outputting the signals to generate abrasion performances for a sample A and a sample B of the friction pairs; and therefore, the micro-movement friction and abrasion testing machine has the characteristics of being adjustable in vibration excitation amplitude, variable in vibration mode, convenient to operate and move, high in loading precision, and reproducible in project service condition, the experimental data is high in repeatability and can be used for evaluating the micro-movement friction and abrasion performance of a material.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1

System for kinetic model test of ballastless track subgrade of high-speed railway

The invention discloses a system for kinetic model test of the ballastless track subgrade of a high-speed railway. The system comprises a model test box, a model of the ballastless track subgrade of the high-speed railway, an excitation system and a monitoring system, wherein the model of the ballastless track subgrade of the high-speed railway is formed by the foundation, a foundation bed bottom layer, a foundation bed surface layer, a concrete base, CA (cement asphalt) mortar, a track plate, a fastener system and a steel rail in sequence; the excitation system comprises a series of vibration exciters; simulation of train loads at different running speeds is realized by cooperatively controlling the vibration excitation frequency and phase of each vibration exciter; and dynamic earth pressure sensors and layered settlement gauges are arranged in the model of the subgrade, steel strain gauges are embedded in the concrete base and displacement and acceleration sensors are arranged on the track structure to jointly form the monitoring system of the system. The system can be used for carrying out study on the kinetic model test of the subgrade under the running load of the train and can evaluate and predict different foundation conditions, subgrade structures and track irregularity.
Owner:ZHEJIANG UNIV

Testing device for bearing dynamic characteristic parameters

InactiveCN103105296AEasy to Accurately AcquireReduce complexityMachine bearings testingData acquisitionEngineering
The invention discloses a testing device for bearing dynamic characteristic parameters. The testing device for the bearing dynamic characteristic parameters is composed of an instrument and equipment system, and a testing device. The instrument and equipment system comprises a data collector, a signal conditioning instrument, a power amplifier, a digital indicator, a vibration exciter, an impedance head, a piezoelectricity accelerating speed sensor, and an electronic computer. The testing device comprises an iron cast platform, a mounting base plate, a bearing seat, a bearing sleeve, a bearing, a mandrel, a shaft end nut, a pre-tightening nut, a rubber spring, an axial loading device, a radial loading device, a pre-tightening device, a bracket, an elastic rope and the like. The testing device for the bearing dynamic characteristic parameters is compact in structure and clear in test principle, the loading devices are infinitely adjustable, and the testing devices can measure the bearing dynamic characteristic parameters under load condition of different axial force, radial force, pre-loading force and the like. When measurement is conducted, vibration force direction penetrates through mandrel axis to measure vibration signals of an inner ring and an outer ring of the bearing at same time, affect from vibration signals of the bearing outer ring is eliminated when a displacement frequency response function is calculated, and the testing method is high in efficiency, precision, and stability.
Owner:NANJING UNIV OF SCI & TECH

High-efficiency excellent bean screening equipment

The invention discloses high-efficiency excellent bean screening equipment. The equipment comprises a feeding pipe, a box body, an inclined guide plate, a screen plate, a vibration exciter, a spring, a telescopic rod, a water separation box, a camera, an air separation machine and a drying box, wherein a feeding pipe is arranged at the top end of the box body; a timer is arranged on the side wall of the box body; the air separation machine is arranged on the inner wall of the box body; the screen plate is arranged in the box body; the vibration exciter is arranged on the screen plate; the bottom surface of the screen plate is connected with the top end of the telescopic rod by the spring; the bottom end of the box body is connected with the water separation box by a first transmission pipe; an outlet end is in contact connection with the first transmission pipe; a filter plate is arranged in the bottom end of the water separation box; a rotating shaft is arranged in the water separation box; stirring blades are mounted on the rotating shaft; the rotating shaft is connected with an outer motor; the middle part of the water separation box is connected with the drying box by a second transmission pipe; an inclined filter screen is arranged in the drying box; a dryer is arranged under the inclined filter screen; an air heater is arranged in the drying box; and the camera is arranged at the top end of the box body. According to the high-efficiency excellent bean screening equipment, quick breeding selection is carried out, the structure is simple, the use is convenient, and the promotion is facilitated.
Owner:黄海

Multi-crack damage identification apparatus and method for cantilever flexible beam

The invention discloses a multi-crack damage identification apparatus and method for a cantilever flexible beam. The apparatus comprises a flexible beam, a mechanical clamping device, a detection device, a vibration exciter, a signal generator, a power amplifier, a fiber Bragg grating demodulator and a computer. One end of the flexible beam with multiple cracks is fixed through the mechanical clamping device; a multi-channel FBG optical fiber sensor group is adhered on the flexible beam and is evenly distributed along the length direction of the flexible beam; a signal generated by the signal generator is amplified by the power amplifier and then enters the vibration exciter; the vibration exciter excites low-order mode vibration of the flexible beam; the vibration results in curvature changes at measurement points of each sensor of the beam; the sensors input the curvature changes into the fiber Bragg grating demodulator in the form of wavelength changes; a demodulated signal enters the computer for modal analysis of the flexible beam, drafting of a modal curvature curve, calculation of damage indexes and establishment of a wavelet neural network identification model; and finally, the purpose of accurate identification of the depth and the location of the cracks of the flexible beam is achieved.
Owner:SOUTH CHINA UNIV OF TECH

Dynamic performance test platform of vibration isolator system and test method thereof

The invention provides a dynamic performance test platform of a vibration isolator system. A vibration isolator is placed at the center of a base platform, a mass component is placed at the top of the vibration isolator and is detachably connected with the vibration isolator, a vibration exciter mounting bracket is installed on the base platform and is used for hanging a vibration exciter right above the mass component, a vibration input rod is arranged at the bottom center of the vibration exciter and is detachably connected with the mass component to transfer the vibration of the vibration exciter onto the mass component, a guide bracket is further installed on the base platform, is vertical to the base platform and is detachably and movably connected with the mass component, the mass component can only move along the guide bracket under the limit of the guide bracket, a force sensor I is installed on the vibration input rod, a vibration sensor is installed on the mass component, a force sensor II is installed at the bottom center of the vibration isolator, and the mass of the mass component is smaller than 1000 kg. The invention further provides a dynamic performance test method of the vibration isolator system.
Owner:ZHUZHOU TIMES NEW MATERIALS TECH

Touch Sensitive Device

A touch sensitive device comprising a panel capable of supporting bending waves, a user-accessible touch sensitive screen on or forming part of a face of the panel, the touch sensitive screen having a plurality of different sensing areas, a plurality of vibration exciters coupled to the panel to apply bending waves to the panel to provide tactile feedback at the plurality of sensing areas in response to the user touching a sensing area, and signal processing means arranged to apply signals to the vibration exciters so as to steer bending waves applied to the panel by the plurality of vibration exciters whereby the amplitude of the applied bending waves is maximised at the sensing area touched by the user and reduced or minimised at each other sensing area.
Owner:GOOGLE LLC

Electrostatic force microscope and measurement method thereof

The invention provides an electrostatic microscope and a measurement method. The electrostatic microscope consists of a scan head, a low frequency voltage signal generator, a high frequency voltage signal generator, a low frequency vibration signal detector, a high frequency vibration signal detector and a controller; and the scan head comprises a probe, a probe location inductor, a piezoelectric vibration exciter and a piezoelectric scanner. Based on an existing electrostatic force microscope, a higher order eigenvibration mode of the probe is adopted to measure electrostatic force. As interaction of the probe and the sample is different in different vibration modes, the corresponding performance is different in aspects such as resolution, sensitivity, stability and the like. The electrostatic microscope can help significantly improve spatial resolution of the electrostatic force microscope in atmospheric environment.
Owner:SUN YAT SEN UNIV

Bending wave panel loudspeaker

From one aspect, the invention is a method of making a bending wave panel loudspeaker, comprising rigidly coupling a lever to a panel edge or marginal portion such that the lever extends at an angle to the plane of the panel, coupling a bending wave exciter to the lever whereby bending wave energy is coupled to the panel to produce an acoustic output when the exciter is fed with a signal and supporting the panel on a suspension positioned outboard of the lever. From another aspect the invention is a bending wave panel-form loudspeaker having a lever rigidly coupled to a marginal portion or edge of the panel, a vibration exciter coupled to the lever to apply bending wave energy to the panel to produce an acoustic output and a panel suspension positioned outboard of the lever. From a further aspect, the invention is a small electronic device, e.g. a mobile telephone or PDA, having a display screen, and a transparent protective cover over the display screen, wherein the transparent protective cover is a loudspeaker as described above.
Owner:GOOGLE LLC

Carrying device of three advance geology forecasting instruments on TBM (Tunnel Boring Machine)

ActiveCN103698806AAdvancement of Geological Forecasting AbilitySimple structureSeismic signal receiversRadarEngineering
The invention discloses a carrying device of three advance geology forecasting instruments on a TBM (Tunnel Boring Machine). The carrying device comprises a transmission supporting and shock absorption device, a telescopic transmission system and an instrument cabin protection device, wherein the transmission supporting and shock absorption device is convenient for carrying power supplying / measuring electrodes, and installing seismic wave vibration exciters and a seismic wave sensor on a TBM cutter disk; the telescopic transmission system is convenient for carrying an oblique single-hole geology radar transmitting and receiving antenna above a TBM rear support; the instrument cabin protection device plays a protection role when the TBM is in boring operation and is convenient for carrying an instrument cabin controlling the whole detection work at the inner part of the TBM rear support. According to the carrying device disclosed by the invention, the integration of detection instruments and the TBM is realized, the detection space and the detection time of a full-face excavation tunnel are fully utilized, the detection instruments are automatically and quickly distributed on a working surface of the TBM, an advance detection hole is drilled, the three advance geology forecasting instruments are successfully carried, the detection efficiency of advance geology forecasting and the automation and rapidity level are increased, and the advance geology forecasting capacity of the TBM is obviously enhanced.
Owner:山东百廿慧通工程科技有限公司

Multifunctional fastener testing machine

ActiveCN105784304AChange the ambient temperatureSimple drive structureVibration testingCouplingMultiple sensor
The invention provides a multifunctional fastener testing machine, belongs to the field of mechanical testing equipment, and relates to the multifunctional fastener testing machine. According to the testing machine, multiple sensors and vibration exciters are cooperatively adopted to test torque, force and displacement of a tested piece. A guide rail is installed on a base. The output shaft of a speed regulating motor installed on the guide rail is connected with a coupler. One end of a toque rotating speed sensor is connected with the coupler, and the other end is fixedly connected with a sleeve. The sleeve clamps the tested fastener. An intermediate connecting clamp plate is fixedly installed on the base. A transverse vibration exciter installed at the left part of the base is connected with an axial force sensor through threads. The other end of the axial force sensor is installed at the left end of the intermediate connecting clamp plate. The testing machine can perform pre-tightening loading and loading of vibration load on the same tested fastener without changing the state so that the measured data are enabled to be more accurate. The vibration exciters are adopted so that the structure is simplified, space is saved and test accuracy is enhanced.
Owner:DALIAN UNIV OF TECH

Audio vibration exciter

An audio resonance vibrator includes a yoke defining a bottom and a sidewall extending vertically from the bottom, an elastic frame cooperatively with the yoke forming a housing defining a receiving space, a magnet disposed on the bottom of the yoke cooperatively with the sidewall of yoke forming a magnetic gap, a vibrating unit accommodated in the receiving space defining a vibrating plate and a coil assembly connected with the vibrating plate. The coil assembly is at least partially received in the magnetic gap, and the vibrating plate is positioned on the elastic frame. The audio resonance vibrator further includes an elastic member interposed between the magnet and the vibrating plate to support the magnet.
Owner:AAC TECH NANJING +1

Device for testing dynamic characteristic parameters of fixed joint surface and testing method thereof

InactiveCN102072806AEasy to Accurately AcquireAccurate acquisitionVibration testingEngineeringVibration exciter
The invention relates to a device for testing dynamic characteristic parameters of a fixed joint surface of a single-degree-of-freedom system. The device comprises a base, a lower experimental plate, an experimental sample wafer, an upper experimental plate, a piezoelectric acceleration transducer, a bolt, a bracket, a vibration exciter, an impedance head, a charge amplifier, a digital analyzer, a power amplifier, an electronic computer, a normal coupling bolt hole, a lower experimental plate coupling bolt, a tangential coupling bolt hole and a flexible rope. Compared with the prior art, the device has the remarkable advantages of compact structure and clear testing principle; the dynamic characteristic parameters of a normal contact surface and a tangential contact surface can be simultaneously measured; the dynamic characteristic parameters of the contact surfaces in different load states can be measured by adjusting the pre-tightening force of the coupling bolt of the upper experimental plate and the lower experimental plate; the excitation force passes through the center of gravity of the upper experimental plate during measurement; vibration signals of the upper experimental plate and the lower experimental plate are simultaneously measured; the influence of the vibration signal of the base is eliminated during the calculation of a frequency response function of the system; and the device has the characteristics of high efficiency, stability and accuracy.
Owner:NANJING UNIV OF SCI & TECH

Coriolis mass flow transmitter based on DSP

The invention relates to the field of flow detection, and provides a Coriolis mass flow transmitter based on DSP, which comprises an amplifying filter circuit, an analog-to-digital converter 1, an analog-to-digital converter 2, a voltage reference source, a voltage follower, a current source, a difference amplifier, an analog-to-digital converter 3, a simulation driver module, a digital signal processor DSP minimum system, an expanding SRAM, an expanding EEPROM, a man-machine interface, 4-20mA current output and pulse output, a power module and a software. The simulation driver module stimulates a vibration exciter in the Coriolis mass flow transmitter so as to lead a flow tube to vibrate with natural frequency. Two magnetoelectric sensors positioned at two sides of the flow tube output two ways of sine-wave signals which are amplified and filtered by two ways of conditioning circuits with same parameter, then respectively and simultaneously sampled by two analog-to-digital converters with same model, and converted in digital value, and delivered to DSP by two multichannel buffered serial ports of the DSP. DSP adopts digital filter to eliminate the noise of the signals, is self-adaptive to a lattice notch filter to calculate the frequency, and then adopts the DTFT algorithm taking negative frequency into account to calculate to phase difference, thus obtaining the mass flow finally.
Owner:GOLDCARD HIGH TECH

High temperature and high pressure in-situ fretting wear test device

ActiveCN104359778AHigh control precisionReal-time adjustment of micro-motion amplitudeInvestigating abrasion/wear resistanceEngineeringAuxiliary electrode
The invention relates to a fretting wear test device, in particular to a high temperature and high pressure in-situ fretting wear test device, and solves the problems that in-situ fretting wear is difficult to realize at a high temperature and a high pressure; fretting amplitude and frequency are difficult to control accurately; electrochemical signals are hard to measure during fretting wear. The fretting wear test device is provided with a vibration exciter, a thermocouple, a working electrode / auxiliary electrode seat, an autoclave cover, a hydraulic cylinder, an autoclave body, an upright, a positioning plate, a first sample holding and loading device, a moving shaft, an upper linear guideway, a working electrode, a moving shaft guide bracket, an auxiliary electrode, a connecting nut I, a reference electrode seat, a reference electrode, a lower linear guideway, an upper guide platform plate, an upper guide rod, a lower guide rod, a lower guide platform plate and a connecting nut II. The device is capable of performing in-situ fretting wear on the surface of a sample at a high temperature and a high pressure. The reference electrode, the working electrode and the auxiliary electrode mounted on an autoclave work with an electrochemical workstation to detect the electrochemical signals during fretting wear.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Active vibration absorber with flexible structure and control method thereof

The invention discloses an active vibration absorber with a flexible structure and a control method thereof. The active vibration absorber comprises a signal acquisition unit and a control vibration absorption unit; in the signal acquisition unit, the flexible structure is provided with an ICP acceleration transducer, and a signal is transmitted to a constant current source, a data acquisition device and an analog / digital converter in turn and then transmitted to a computer to be processed; and in the control vibration absorption unit, a computer control signal is transmitted to the analog / digital converter and a first power amplifier and then transmitted to an actuator to execute vibration absorption. In order to simulate external excitation, the active vibration absorber is provided with an exciting force output unit, a signal generator of the unit is connected with an input end of a second power amplifier, a signal generated by the signal generator is amplified by the second power amplifier and then input to a vibration exciter, and the vibration exciter is connected with the flexible structure through a post rod to provide external disturbance. The method mainly comprises an off-line recognition process and a real-time control process. A random walk and input estimation method is introduced into active vibration control of the flexible structure, and good control effect is acquired from an experimental angle.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Efficient building sandstone screening and washing device

The invention discloses an efficient building sandstone screening and washing device which comprises a feeding pipe, a grid, a liquidometer, a box body, a water inlet pipe, a flowmeter, a spray head, a rotary shaft, a camera, a timer, an impeller, a screen plate, a vibration exciter, a coarse sandstone discharging pipe and a fine sandstone discharging pipe; the feeding pipe is arranged at the top end of the box body and internally and obliquely provided with the grid; the lowermost end of the grid is provided with an impurity discharging pipe, the liquidometer is arranged on the box body, the box body communicates with the water inlet pipe, the outlet end of the water inlet pipe is provided with the spray head, and the flowmeter is installed on the water inlet pipe; the camera is arranged on the inner wall of the top end of the box body, the rotary shaft is arranged in the box body, and the impeller is installed on the rotary shaft; and the screen plate is obliquely arranged in the box body, the vibration exciter is arranged on the lower surface of the screen plate, and the screen plate comprises a first screen plate body and a second screen plate body. The efficient building sandstone screening and washing device is capable of screening sandstone, improving the working efficiency and saving time and labor, simple in structure and convenient to use and popularize.
Owner:王剑

Indoor experimental device for antifriction resistance property of axial vibration of petroleum drilling pipe column

The invention discloses an indoor experimental device for antifriction resistance property of axial vibration of a petroleum drilling pipe column. The device comprises a simulated pipe column combination system, a loading system, a vibration system, a measurement system and a fixing system, wherein the simulated pipe column combination system comprises a simulated pipe column and a simulated shaft; the loading system comprises a loading hand wheel and a loading lead screw; the vibration system comprises a telescopic sleeve, a simulated vibration exciter and an impact baffle; the measurement system comprises pressure and displacement sensors, a data processing device, signal cables and a displacement sensor; the fixing system comprises a fixing bracket, fastening bolts, positioning bolts, a fixing piece, an experimental table and an open-groove bottom plate. The indoor experimental device can be used for researching the antifriction resistance property and mechanism of an axial vibration tool under the conditions of different wellbore curvatures, mounting positions, vibration amplitudes and frequencies, and provides a theoretical basis for design and field application of a special downhole tool for antifriction resistance of axial vibration.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Vibration-crushing micro-pill machine

The invention pertains to the technical field of medicine preparation and relates to a vibration-crushing micro-pill machine which comprises a liquid storage pot, a pill dripping system, a cooling circulation device, a micro-pill collecting machine and a control circuit, wherein the pill dripping system comprises a dropper, a jet hole, a vibration exciter and a gear pump. The dropper is connectedwith the vibration exciter by a rigid connecting rod. The lower part of the dropper is provided with one or more jet holes, the upper part of which is a liquid inlet and the lower part thereof is a nozzle. The dropper is connected with an electric valve at the lower part of the liquid storage pot by pipes on which the gear pump is arranged. The side wall of the dropper is provided with two insertion holes in which a heater and a temperature sensor respectively connected with the control circuit are arranged. The control circuit controls the make-and-break of the heater according to the detected temperature of the temperature sensor. The cooling circulation device comprises a condensation column, a stirring device, a filter, a cooling cylinder, a cooling pump and an electromagnetic pump. The vibration-crushing micro-pill machine has the advantages of chance of batch production of micro-pills, high production efficiency, simple equipment structure and convenient control.
Owner:TIANJIN UNIV

Dynamic change original position observation system for seabed interfacial layer

ActiveCN107328552ARealize synchronous observationObservation lastsHydrodynamic testingMeasuring open water movementOcean bottomSeabed sediment
The invention discloses a dynamic change original position observation system for a seabed interfacial layer. The dynamic change original position observation system comprises a seabed interfacial layer observation platform, an oscillating type detection rod penetrating apparatus and a multiparameter observation detection rod, wherein the seabed interfacial layer observation platform is used for loading various observation apparatuses and the oscillating type detection rod penetrating apparatus and is in riveted connection with the detection rod penetrating apparatus, the probe of an anti-sinking plate and a through hole are designed to form the laying stability and recovery convenience of an entire observation system, and the oscillating type detection rod penetrating apparatus uses a vibration exciter to generate vertical power to allow the observation detection rod to continuously insert in seabed deposit. New design principle and means are employed, partial liquefaction and strength reduction of seabed deposit can be realized through high frequency vibration, so that the observation detection rod can continuously insert in the seabed deposit, and the implementation is more convenient. The multiparameter observation detection rod is connected with the vibration exciter, and integrated with various sensors to realize synchronous observation of three-phase media of sea water body-seabed interface-seabed deposit. A water inlet fine pipe is provided and a water inlet when opened during recovery can eliminate vacuum suction on the bottom of the detection rod to facilitate recovery. The observation system provides essential technology support for researching dynamic evolution of the seabed interfacial layer.
Owner:OCEAN UNIV OF CHINA
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