42results about "Subsonic/sonic/ultrasonic wave measurement" patented technology

Apparatus for monitoring structural health conditions of structures. The apparatus includes a piezoelectric device that has a bottom cover plate, piezoelectric rings concentrically disposed with respect to an axis and positioned on the bottom cover plate, and concentric filler rings made from an electrically insulating material. Each of the piezoelectric rings is interposed between two adjacent filler rings. The piezoelectric device also includes electrical connection means for communicating electrical signals to the piezoelectric rings and a top cover plate that is positioned over the piezoelectric rings and filler rings. The electrical connection means are operative to transmit electrical signals that cause one or more of the piezoelectric rings to generate waves or transmit electrical signals developed by one or more of the piezoelectric rings in response to the waves.

The invention provides a tricomponent vibration calibrating device which comprises a tricomponent standard vibration table, wherein the tricomponent standard vibration table comprises a base, an electromagnetic vibration table in an X direction, an electromagnetic vibration table in a Y direction, an electromagnetic vibration table in a Z direction and a three-dimensional vibration platform; eachaxial vibration table is equipped with a laser vibration meter; vibration signals acquired by the laser vibration meters are input into a data acquisition unit; each axial vibration table is providedwith a standard transducer; output signals of the standard transducers are input into a feedback controller; the other input end of the feedback controller is connected with a multi-channel signal generator; after output signals of the feedback controller pass through a power amplifier group, each axial vibration table is driven to move; the multi-channel signal generator is controlled by a processor; output voltages of a calibrated three-dimensional vibration measuring transducer placed on the three-dimensional vibration platform are input into the data acquisition unit which is connected with the processor; and a sensitivity matrix of the calibrated three-dimensional vibration measuring transducer is calibrated by the processor. The tricomponent vibration calibrating device has the advantages that three measuring shafts of the three-dimensional vibration measuring transducer can be excited at the same time, and then the sensitivity matrix reflecting the coupling relations among dimensions of the three-dimensional vibration measuring transducer is acquired.

The invention discloses a satellite ground micro-vibration test system. The satellite ground micro-vibration test system comprises a high-sensitivity sensor used for extracting vibration signals near a disturbance source or a load, an anti-aliasing filter used for performing anti-aliasing filtering on the vibration signals extracted by the high-sensitivity sensor to form piezoelectric signals, a high-modulus conversion rate acquirer used for generating the piezoelectric signals into digital signals and a high-precision controller used for controlling display, storage and analysis of the digital signals. According to the invention, the high-sensitivity sensor realizes small-magnitude acquisition of the vibration signals, digital signals are generated through a high-precision data acquisition card after the vibration signals are subjected to the anti-aliasing filtering, and subsequent process is performed to provide efficient input for the subsequent satellite vibration reduction or vibration isolation and environmental test and also realize verification of vibration reduction or vibration isolation performance. Therefore, the satellite ground micro-vibration test system, disclosed by the invention, has the advantages of satisfying demands on acquisition and analysis of micro-vibration signals and being of great importance in improving control precision and stability of a satellite platform.

The invention discloses a failure prediction method based on ICA reconstruction, which includes the following steps: step 1, calculating a separative matrix W; step 2, calculating the statistic value I<2>(k), SPE(k) or I<2>e(k) of the real-time data Xnew(k) through adopting the formulas I<2>(k)=S'newd(k)<T> S'newd(k), I<2>e=S'newe(k)<T>*S'newe(k), SPE(k)=(xnew(k)-x'new(k))<T>*(xnew(k)-x'new(k)), S'newd(k)=Wd*xnew(k), and S'newe(k)=We*xnew(k), wherein Wd refers to the matrix formed by the lines expect the first d lines of the separative matrix W, We refers to the matrix formed by the lines except the first d lines of the separative matrix W, and X'new(k)=Q<-1>BdWd*xnew(k), Bd=(WdQ<-1>)<T>, Be=(WeQ<-1>)<T>, and Q refers to a whitening matrix; and step 3, calculating the nuclear density of I<2>(k), SPE(k) or I<2>e(k), and detecting failures as per the control limit. The method provided by the invention solves the problem that the traditional flue gas turbine prediction method can not utilize the multidimensional valid data, takes the multi-channel vibration data into consideration, can be used for directly predicating failures, and improves the prediction accuracy compared with the PCA reconstruction method.

The invention discloses a submarine pipeline suspended span vortex-induced vibration active monitoring system and a method thereof. A vortex-induced vibration monitoring device is used for obtaining and transmitting vortex-induced vibration information of a suspended span. When the frequency of X-axis acceleration data is two times of the frequency of Y-axis acceleration data, the suspended span generates vortex-induced vibration, and the vortex-induced vibration monitoring device transmits a vortex-induced vibration frequency to a vortex-induced vibration monitoring center through a water sound channel. A receiving and displaying device is used for receiving sound signals through the water sound channel, transmitting the sound signals into electric signals, processing the electric signals and displaying the frequency information of vortex-induced vibration. When the suspended span does not generate vortex-induced vibration, data transmission is not performed, and the vortex-induced vibration monitoring center keeps silent. According to the invention, the previous concept for passively monitoring the vortex-induced vibration of the suspended span is changed, data transmission is carried out only when the vortex-induced vibration is generated, the data transmission frequency is lowered, the energy consumption of the monitoring device is lowered, the time of determining the vortex-induced vibration is shortened, and the suspended span monitoring and managing efficiency is improved.

The invention discloses a monolithic integration composite range vector hydrophone. The current vector hydrophone can not measure various kinds of frequency signals in one test process because of mutual restriction of sensitivity and an effective work frequency band. By using the vector hydrophone of the invention, the above problem can be solved. The vector hydrophone comprises: a field-shaped support, elastic beams and mass blocks which are suspended on middle parts of four little box bodies of the field-shaped support respectively. Four sides of the each mass block are fixed with the field-shaped support through one elastic beam respectively. A terminal and a root of the each elastic beam are integrated with piezoresistors with a same resistance respectively. The middle parts of the four mass blocks are vertically provided with cilia cylinders with a same diameter respectively. The four cilia cylinders have different lengths. In the invention, through the four cilia cylinders with different lengths, sound signals in different measuring range scopes can be detected. The vector hydrophone can be used for determining a variable frequency value. And the effective work frequency band can be widened.

The invention discloses a well-ground seismic data joint acquisition system based on distributed optical fiber acoustic wave sensing and a well drive data processing method. In order to solve the problems of inconsistent energy, inconsistent frequency spectrum and incompletely consistent coupling between a seismic source and the ground caused by repeated excitation of each seismic source point when seismic data in a well and seismic data on the ground are respectively acquired in the prior art, the invention discloses an in-well-ground seismic data combined three-dimensional acquisition systemformed by a distributed optical fiber sound wave sensing seismic data acquisition unit and a ground seismic data acquisition unit. In-well-ground combined three-dimensional exploration is carried out, ground and in-well seismic data are synchronously collected, the high-density, high-benefit, high-resolution and low-cost well-ground combined three-dimensional seismic exploration technology is achieved, and oil and gas resource exploration and comprehensive evaluation are carried out.

The invention provides a high-temperature miniaturized resonant gyroscope. The gyroscope comprises a harmonic oscillator, a circuit board, piezoelectric elements, a supporting base, a shell and binding posts, wherein the harmonic oscillator is arranged in the shell and connected with the supporting base, and the piezoelectric elements are connected with the binding posts through a metal conductor.Key process points of internal elements of the gyroscope are fixedly connected by adopting a high-temperature material and a high-temperature process, and the gyroscope is a small-size gyroscope capable of working at a high temperature. The invention also provides an inertial navigation system. The system comprises a three-axis gyroscope, a three-axis accelerometer and a shock absorber, wherein the gyroscope is fixedly connected with the shock absorber, and the gyroscope adopts the high-temperature resonant gyroscope. The invention further provides a drilling measurement system and a drillingmeasurement method. The system has the environmental adaptability under high temperature, strong vibration and large impact and has the advantage of small volume of drilling measurement. The method is used in the measurement system, and underground position measurement can be accurately carried out.

A method for measuring and displaying a factor includes: sensing a factor by using a sensing unit, which is movable in a plane, a curved surface, or a space where the factor for sensing is generated or contained and senses the factor; photographing the plane, the curved surface, or the space; simultaneously recognizing a position of the sensing unit by targeting the sound sensing unit when sensing the factor in the step of sensing; generating a factor map data by mapping the factor sensed in the step of sensing onto the position sensed in the step of recognizing; overlaying the factor map data with the picture data; and displaying the factor map data overlaid with the picture data.

Adjustment of the distance between the tip of a pickup section and the outer surface of a shaft of a rotor can be carried out easily and with high precision. In a vibrometer mounting mechanism securing a measuring section of a vibrometer for measuring vibration of a shaft of a rotary machine to a casing of the rotary machine, the vibrometer mounting mechanism includes a case secured to the casing with fixing means; an inner cylinder that accommodate the measuring section at one end, that is disposed in the inside of the case, and that slides relative to the case; and an adjustment bolt disposed at one end of the case and capable of moving forward and backward with respect to the case and the inner cylinder, wherein the inner cylinder is made to move in a direction away from the shaft by the adjustment bolt being inserted into the case and the inner cylinder, and wherein the inner cylinder is made to move in a direction toward the shaft by the adjustment bolt being retracted from the case and the inner cylinder.

The invention discloses a fan abnormal sound detection system and relates to the technical field of fan detection. The fan abnormal sound detection system comprises a sensor module, a signal collection module, a data processing module and a fixed support. The sensor module comprises an acceleration sensor, a sound sensor and a thermoelectric converter. The signal collection module comprises an NI9234 data collection card and an NI cDAQ-9188XT Ethernet cabinet. The NI9234 data collection card is connected with the acceleration sensor and the sound sensor and is further connected with the NI cDAQ-9188XT Ethernet cabinet. The data processing system comprises a data conversion and characteristic extraction module based on Labview and a mathematic modeling analysis system module based on Matlab. The data conversion and characteristic extraction module based on Labview is connected with the NI cDAQ-9188XT Ethernet cabinet and the mathematic modeling analysis system module based on Matlab. According to the invention, signal collection, analysis and judgment are integrated, and the manual misjudgement problems caused by inconsistent boundary judgment are reduced; in addition, the automatic degree is high, manual cost is saved, and the production efficiency is improved.

The invention provides a vehicle positioning and speed measuring system and method based on a grating array sensor. The system comprises a grating array module, a real-time data acquisition module, a vehicle position determination module and a vehicle speed determination module. The grating array module is used for acquiring a vibration signal of a vehicle in real time; the real-time data acquisition module is used for acquiring a vibration signal according to a preset acquisition time length and a preset sampling frequency to obtain a vibration sampling signal; the vehicle position determination module is used for determining the vehicle position based on the vibration sampling signal; the vehicle speed determination module is used for determining sampling point information corresponding to wheels of the vehicle based on the vibration sampling signals and determining the vehicle speed according to the sampling point information. According to the invention, all-weather monitoring of the vehicle is realized, and the efficiency and precision of positioning and speed measurement of the vehicle are improved.

The invention relates to wind supplying system for wind cooling engine noise detection. It is mainly made up of a fan, wind channel, temperature sensor, engine rotate speed adjustor and water quantity adjusting valve. The fan is assembled out of the noise chamber, the wind cooling engine is assembled on the center line of the wind channel outlet, and the inner wall of the noise chamber is arranged with sound absorption cut. In the wind channel there arranges with water pipe, water quantity adjustor and atomization nozzle. The temperature sensor is assembled on the surface of the wind cooled engine and its output end is connected to the temperature monitor. The realization of low noise wind supplying system is mainly through the water drop sprayed from the atomization nozzle to cool the surface of the wind cooled engine effectively, thus the wind quantity can be decreased, the invention can ensure the effective cool to the engine, and it can control the noise about 10 dB lower than the noise of engine.

The invention provides a high-sensitivity metal baseband armored vibration sensing optical cable. The vibration sensing optical cable comprises optical cables, metal basebands, metal through holes, and adhesive. The optical fibers are placed in the metal basebands with semi-elliptic slots, and the two metal basebands and the optical fibers are solidified into a whole armored optical cable through opposite adhesion. By designing the metal baseband armored vibration sensing optical cable, a simple-to-process and low-cost way of armored enhanced protection is provided for optical fibers. The service life of the vibration sensing optical cable is prolonged greatly. The sensing optical cable can be welded onto an area to be monitored, and can be kept in a high-sensitivity vibration to-be-received state for a long time. By designing the metal baseband armored vibration sensing optical cable, more vibration disturbance can be converted into deformation of the optical fibers, the vibration sensing sensitivity is improved greatly, and long-distance distributed optical fiber real-time monitoring of ultra-weak vibration signals such as sound wave is realized. The high-sensitivity metal baseband armored vibration sensing optical cable can be applied to the field of distributed optical fiber vibration sensing applications.

Embodiments of the invention include a system and method for detecting wood-boring species of insects in a structure (16), involving one or more primary (14) and reference (18) sensors and a signal conditioning and acquisition device (22) capable of being coupled to the sensors (14, 18). The system (10) also includes a processor (24) capable of being coupled to a non-transitory, computer-readable storage medium that includes program logic for execution by the processor (24). The program logic includes a logic module that receives signals originating from the sensors (14, 18) and discriminates between noise generated by any wood boring species in the structure and extraneous noise unrelated to the wood boring species of insects. The extraction of signal features based on pulse duration, signal spectra and signal envelope spectra can be used for insect pulse discrimination. A sound-suppressing sensor assembly (12) can be weighted to enhance the coupling of the primary sensor (14) with the structure (16) being tested.

The invention discloses a GIS mechanical fault diagnosis method based on mechanical state signal analysis, and relates to the technical field of power equipment monitoring, and the method comprises the steps: collecting a vibration signal of GIS equipment in a running state; performing noise reduction processing on the acquired vibration signal by using a pole symmetry mode decomposition (ESMD) method and a relative entropy method; extracting a feature vector contained in the signal by using Hilbert transformation; performing attribute reduction on the feature vectors by using a rough set theory and establishing a diagnosis decision table; and establishing a three-layer forward neural network fault diagnosis model according to the diagnosis characteristic decision table. Compared with a traditional method, the method can be applied to intelligent diagnosis of different types of mechanical faults of the GIS device, and has the advantages of being good in real-time performance and high in diagnosis accuracy.

The invention provides a helical pipe used for researching the detonation wave propagation characteristic. The helical pipe comprises a helical plate, a first helical pad, a second helical pad, a sootiness plate and an annular pad. The helical plate compacts the first helical pad and the second helical pad between the upper and lower surfaces of the helical plate through bolts, the diameter of the first helical pad is larger than that of the second helical pad, the sootiness plate is embedded between two helical pads and aligns to the upper surfaces of the two helical pads, the annular pad is arranged between the upper surfaces of the two helical pads and the upper surface of the sootiness plate and the lower surface of the helical plate, and the lower surface of the sootiness plate, opposite side surfaces of the two helical pads and the upper surface of the helical plate form a detonation wave propagation channel. According to the invention, the detonation wave can be propagated continuously in a multi-circle annular channel, and the phenomenon, of the detonation wave, which cannot be observed in a low-angle bend pipe can be researched.

The invention discloses steam turbine generator unit fault visual diagnosis method and system. The method comprises the steps: acquiring operation parameters and vibration data of the steam turbine generator unit; obtaining a reference vibration vector of the steam turbine generator unit under all working conditions according to the operation parameters and the vibration data; acquiring a real-time vibration vector of the steam turbine generator unit under all working conditions; comparing the real-time vibration vector with a reference vibration vector to obtain a vibration vector differencevalue; and carrying out fault determination on the steam turbine generator unit according to the vibration vector difference value. By adopting the method or the system provided by the invention, faults can be judged in time, and the risk of serious accidents of the unit is reduced.

The invention discloses a vibration detection device. The vibration detection device comprises a grabbing limit unit and a detection unit. The grabbing limit unit is formed by a substrate and a floating clamping jaw mechanism. The detection unit is formed by a base bench, a vibration sensor and an electrification element. The electrification element is connected with a to-be-detected motor in a powering manner. The vibration sensor is abutted to the to-be-detected motor. After the vibration detection device is used, the beneficial effects are that the vibration sensor can be easily moved and adjusted to cling to the to-be-detected motor in a convenient and quick manner; the vibration sensor is provided with a damping body; the floating clamping jaw is provided with an elastic piece which can eliminate effects on an electric motor imposed by an environment system, so precision of vibration detection can be increased; and the electrification element is provided with horizontal linear displacement towards the to-be-detected motor and is of a detachable type structure, and according to different specifications of electric motors, the electrification element can be replaced and positions of the electrification element can be adjusted, so switching can be quickly finished, detection efficiency is high and application range is wide.

The invention provides a sound power level test tool. The tool comprises a supporting rod and an arc segment. The arc segment is positioned within a vertical plane. One end of the arc segment is detachably connected to the supporting rod in a rotatable manner. The arc segment is provided with multiple microphone clamps arranged at intervals. Since the arc segment can be detachably connected to the supporting rod, a test radius can be changed, and the test efficiency can be improved. The sound power level test tool has a simple structure, is convenient to mount and dismount, and is high in test efficiency.

The invention discloses a detecting device applied to acoustics. The detecting device applied to the acoustics includes a noise tester body; a support plate is disposed under the noise tester body, and the noise tester body is fixedly mounted on the upper surface of the support plate; the outer side of the noise tester body is provided with a protective cover; the bottom of the protective cover iswelded with bumps; the bumps are welded around the protective cover; the upper surface of the support plate is provided with grooves corresponding to the bumps; the bumps are inserted into the grooves; and each bump is provided with a socket. According to the invention, the noise tester body is mounted on the support plate, the support plate is connected to the bottom plate through a bracket, andthe power of the noise tester body is supplied through a battery, therefore, the situation that the noise tester body needs to be connected to an external power supply is avoided; and meanwhile, themovement of the bottom plate is driven by self-locking universal wheels, which is convenient to move the noise tester body to every corner of the site, thereby avoiding the limitation of the noise tester body.

The invention discloses a vibration measuring device and method based on millimeter waves. The vibration measuring device includes an antenna array unit used for emitting and receiving microwave beams, wherein the antenna array unit is connected to a data acquiring and processing unit through a millimeter wave receiving and emitting unit and a baseband signal processing unit in sequence; and a millimeter wave signal is generated by the millimeter wave receiving and emitting unit and is emitted by the antenna array unit, an echo signal is further received through the antenna array unit, and a vibration state of a to-be-measured fan is calculated by the data acquiring and processing unit according to the echo signal. According to the vibration measuring device and method based on the millimeter waves, a millimeter wave array is used for constructing a beam in the specific direction, the direction of the beam is changed, different testing points can be tested at the same time, only one sampling point is needed to realize vibration measuring of the fan, and the whole measuring system cost is lowered.