509 results about "Vibration detection" patented technology

The parallel multi-channel numerical control machine tool with the workpiece vibration detection structure comprises a machine base, and the top of the machine base is connected with a working table top through an electric sliding rail; a bag body on the inner side of a hollow air ring is inflated and expanded through an air inlet pipe and then makes close contact with the surface of a workpiece to form flexible contact, vibration of the workpiece can extrude the bag body in the machining process, the bag body deforms to enable an inner side abutting plate to move, and an abutting rod gets close to a pressure sensor along with the abutting plate and generates pressure; meanwhile, atmospheric pressure fluctuation is released through the conical amplification cavity due to the volume change of the capsule, the sectional area of the conical amplification cavity is gradually reduced from the capsule to the hollow air ring, the atmospheric pressure fluctuation generated by the volume change of the capsule is amplified through the change of the sectional area, and the atmospheric pressure sensor captures the fluctuation and cooperates with the fiber grating sensor to swing along with the propping plate to generate strain; signals of the three types of sensors are synchronously transmitted to the controller, vibration parameters are output after analysis, meanwhile, interference of cutting fluid, scrap iron and the like can be isolated, and stable detection in a severe machining environment is ensured.

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The invention relates to the technical field of textile equipment testing, in particular to a yarn textile high-speed spindle operation stability testing method and system, and the method comprises the following steps: S1, testing element layout; s2, initializing the system; s3, carrying out transient test; s4, testing a steady state; s5, interference processing: carrying out spectrum analysis on the originally acquired data, identifying interference frequency characteristics, eliminating interference by adopting a notch filtering and Kalman filtering combined method, and verifying a filtering effect; s6, parameter correlation modeling: constructing a vibration-temperature-tension-rotating speed parameter correlation model by adopting a control variable method, solving model parameters through a fitting algorithm and verifying validity; s7, quality tracing; s8, stability judgment; and S9, performing real-time monitoring and regulation. According to the method, a combined filtering scheme of notch filtering and Kalman filtering is adopted, fixed interference and random interference such as power frequency and mechanical resonance are suppressed in a targeted manner, and through comparison of locally amplified signals, the filtered signals are smooth in waveform and thorough in noise removal, and the signal-to-noise ratio and reliability of vibration detection signals are improved.

An audio system including an optical microphone and an audio controller. The optical microphone includes a light source and a detector. In some embodiments, the light source illuminates skin of a user. Alternatively the optical microphone also includes a membrane, and the light source illuminates a portion of the membrane. Sounds from a local area cause vibrations in the skin (or vibrations in the membrane). The detector may be in an interferometric configuration or a non-interferometric configuration with the light source. The audio controller monitors the vibrations of the skin (or membrane) using signal output from the detector, and measures the sounds using the monitored vibrations.

The invention relates to a method and a system for adaptively adjusting vibration compensation of an unmanned aerial vehicle based on a multi-band IMU (Inertial Measurement Unit), and the method comprises the steps: W1, in the process that the unmanned aerial vehicle executes a flight task, cooperatively collecting data information of vibration signals of an unmanned aerial vehicle structure based on a plurality of airborne vibration detection IMU arrays, and constructing an unmanned aerial vehicle vibration spectrum analysis model, and calculating the body dominant vibration frequency of the unmanned aerial vehicle to obtain the data information of the body dominant vibration frequency of the unmanned aerial vehicle, and optimizing the acceleration and angular velocity of the unmanned aerial vehicle by adopting an improved weighted average optimization algorithm based on dynamic fusion weight to obtain the optimized data information of the acceleration and angular velocity of the unmanned aerial vehicle. According to the method, the problem of measurement distortion of a single IMU in a resonance frequency band is effectively avoided, it is ensured that high-fidelity inertial data can be output under all working conditions such as low-frequency maneuvering, intermediate-frequency cruising and high-frequency disturbance, and the method can be deployed on a mainstream unmanned aerial vehicle platform and has good popularization value.

The invention discloses a cold atom interference type low-frequency vibration measurement device and a measurement method, and solves the problems that the existing cold atom interference gravimeter measurement equipment is limited by the performance of a vibration sensor, the compensation precision is insufficient, timing calibration is needed, and the measurement precision is low. And measurement errors generated by gravity and ultralow-frequency vibration cannot be effectively separated from a measurement result of the cold atom interference gravimeter, namely, decoupling of two measurement parameters is realized, and cold atom interference measurement of low-frequency vibration is realized. The measuring device comprises a Raman laser output system, a vacuum cavity, a sensitive axis converter and a vibration detection reflecting mirror, the Raman laser output system outputs two pieces of Raman laser which have the same polarization state and are both circular polarization states; the low-frequency vibration is transmitted to the liquid crystal phase modulator through the vacuum cavity for polarization state conversion, and then is reflected to the liquid crystal phase modulator or the vibration detection reflector through the polarization splitting prism, so that the interference type low-frequency vibration of the cold atoms is measured, and decoupling of the two is realized.

An electronic apparatus includes a vibration detector that detects a vibration of the electronic apparatus, and a controller that controls an operation of a fan which cools an inside of the electronic apparatus. The electronic apparatus controls an operation of the fan based on a difference between a first vibration detection result of the vibration detector in a case where the fan is not operated and a second vibration detection result of the vibration detector in a case where the fan is operated.

The invention discloses an electric reactor vibration detection method, device and equipment and a medium, and relates to the technical field of electric power detection, and the method comprises the steps: obtaining an electric drive signal converted from the mechanical vibration of an electric reactor; based on the electric driving signal, controlling the working state of the passive vibration measurement circuit so as to perform frequency multiplication processing and amplitude modulation on the input radio frequency excitation signal to obtain a modulated harmonic signal; performing spectral analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and determining a vibration frequency estimation value of the reactor based on the carrier component and sideband component information; performing inversion calculation based on the sideband component information, and determining a duty ratio estimation value corresponding to the electric driving signal; wherein the duty ratio estimated value represents the conduction time proportion of the passive vibration measurement circuit controlled by the electric driving signal; and querying a preset calibration relation based on the vibration frequency estimation value and the duty ratio estimation value to obtain the vibration acceleration of the reactor. The method can obtain an accurate detection result.

The invention provides an anti-interference system for micro-vibration detection. The system comprises a signal acquisition assembly and an anti-interference assembly connected with the output end of the signal acquisition assembly, and the anti-interference assembly comprises a hardware configurable filter network, an interference feature library and a control logic unit. The hardware configurable filter network receives an original vibration signal collected by the signal collection assembly as an input signal, and the control logic unit monitors the amplitude and / or frequency characteristics of the input signal in real time. And querying the interference feature library in which the mapping relationship between the interference source features and the filter configuration parameters is stored according to the monitored amplitude and / or frequency features of the input signal, so as to generate a control instruction corresponding to a query result based on the query result, thereby enabling the hardware configurable filter network to dynamically configure a filtering strategy. And filtering the environmental interference signal in the analog signal domain based on the configured filtering strategy.

The invention provides a vibration noise detection device and method of a wall breaking machine, and mainly relates to the field of vibration noise detection. A vibration noise detection device of a wall breaking machine comprises a positioning mechanism arranged in a detection chamber and a plurality of noise detection mechanisms, coaxial placement and height adjustment of the wall breaking machine are achieved through clamping and positioning of the positioning mechanism, and the wall breaking machine can be located at the detection height on different workbenches. At least four noise detection mechanisms are arranged, each noise detection mechanism comprises a supporting arm, a supporting cavity is formed in the inner side of the front end of each supporting arm, a telescopic arm is arranged on each supporting cavity in a sliding mode, and a sound level meter and a distance sensor are arranged at the front end of each telescopic arm. The invention has the following beneficial effects: the invention creatively provides a structure and a method for respectively detecting noise by a plurality of workbenches, so that the noise intensity of the wall breaking machine in the daily use process can be more reasonably represented.

The utility model relates to turbine technical field and disclose a power plant turbine vibration protection control device, the outside movable installation of turbine rotor shaft has vibration detection subassembly, the front and back both sides of ring shell all are fixedly installed with face shell, fixedly installed with the partition that arranges in ring between two face shell, the sliding installation of adjacent two partition has arc plate. Turbine rotor shaft will eccentric rotation when rotating, will vibrate at this time, turbine rotor shaft will form extrusion to arc plate simultaneously, and arc plate will contract inwards along the axis of slide rod, and the gasket on arc plate will form extrusion to the trigger end of pressure sensor, and pressure sensor will detect pressure value, and will pass pressure signal to PLC controller, if pressure value exceeds the preset value, PLC controller will control turbine body to stop running, thereby realizes the vibration detection in the operation of turbine and controls its stop running and protects.

The application discloses a train inspection robot and an inspection method, which comprises a moving assembly, a controller, a vibration detection assembly, an acoustic control assembly, a temperature detection assembly, a processor, a positioning assembly and a communication module. The moving assembly is used for driving in a train carriage. The controller stores a preset position. The moving assembly stops at the preset position. When the moving assembly stops at the preset position, the vibration detection assembly moves downward to contact the floor to obtain vibration information of the floor. When the moving assembly drives away from the preset position, the vibration detection assembly is separated from the floor. The acoustic control assembly is used for collecting noise information of electrical equipment. The temperature detection assembly is used for obtaining temperature information of a power distribution cabinet in the carriage. The processor judges the abnormality of the electrical equipment according to the vibration information, the noise information and the temperature information. The positioning assembly is used for determining fault position information. After the communication module establishes a communication connection with a terminal, the fault position information is sent. The train inspection robot has high reliability of a judgment result.

A plasma processing apparatus includes: a processing container having an internal space; a substrate support unit provided within the internal space of the processing container; a gas supply unit that supplies a processing gas into the internal space of the processing container; a plasma generation unit that generates plasma within the internal space of the processing container; a vibration detection sensor provided outside the internal space of the processing container; and a control unit. The control unit is configured to detect a state of the plasma based on vibration detected by the vibration detection sensor.

The application provides a domain controller forming production line, which comprises a domain controller detection device and a domain controller assembling device, wherein the domain controller detection device comprises a domain controller feeding device, a carrying device, a vibration detection device, an air tightness detection device and an AOI detection device; the domain controller is fed by the domain controller feeding device, carried to the vibration detection device by the carrying device, and subjected to vibration detection by the vibration detection device; the carrying device carries the domain controller after the vibration detection to the air tightness detection device, and the air tightness detection device is used for air tightness detection of the domain controller; the domain controller after the air tightness detection is transferred to the AOI detection device, and the AOI detection device is used for AOI detection of the domain controller. The application can automatically assemble and detect the domain controller, and improve the production efficiency and assembling precision.

The invention relates to the technical field of ship stern shaft vibration detection, in particular to a ship stern shaft sealing vibration frequency detection device which comprises a sealing pipe, a detection assembly for achieving frequency detection through vibration conduction is arranged in an inner cavity of the sealing pipe, and the detection assembly comprises a mass block arranged in the inner cavity of the sealing pipe. A partition plate is vertically mounted in the center of the top of the mass block, metal reeds are arrayed on the top of the mass block relative to the partition plate, a connecting spring is fixedly mounted in the center of the bottom of the mass block, a bottom plate is fixedly mounted at the bottom of the connecting spring, and the bottom plate is fixedly connected with the bottom of an inner cavity of the sealing pipe; through the array metal reeds arranged at the top of the mass block, the characteristics that the heights of the array metal reeds are different and the inherent frequencies of the array metal reeds are different are utilized, and when the ship stern shaft vibrates, the metal reed closest to the current main vibration frequency resonates.

The application relates to a matching welding method and system of an automobile bumper, and relates to the technical field of welding, which comprises the following steps: collecting first vibration detection information of a bumper beam clamp, second vibration detection information of an energy absorption box clamp and welding parameters of a welding device; determining first vibration offset parameters according to the first vibration detection information; determining second vibration offset parameters according to the second vibration detection information; analyzing the first vibration offset parameters and the second vibration offset parameters to determine the relative offset amount of the energy absorption box; based on the welding parameters, calling a welding current position point and a current welding power; combining the welding current position point and the relative offset amount to determine welding offset influence parameters; when and only when the welding offset influence parameters meet a preset moving reference reference value, combining the welding offset influence parameters and the current welding power to determine welding adjustment information, and outputting the welding adjustment information. The application has the effect of improving the welding quality of the energy absorption box and the bumper beam.

The utility model relates to the field of vibration detection, concretely relates to a machine tool vibration detection device, including base, be equipped with support rod on the base, the support rod can lengthen or shorten, support rod top is equipped with the mounting rod, the mounting rod end is equipped with the mounting hole for installing camera, the mounting rod side is equipped with the fastening screw hole that communicates the mounting hole, the fastening screw hole is equipped with the fastening bolt, the fastening bolt is used for jacking on camera, the utility model discloses through setting up the base that can move, installs the support rod on the base, sets up the mounting rod at the bottom of support rod, sets up the installation for installing camera at the mounting rod end, through the height adjustment of support rod, through the position adjustment of base and the height adjustment of support rod, make camera can be aligned with the target piece on machine tool, and camera installation is more simple and convenient, can also carry out corresponding adjustment according to the position change of target piece.

An ultrasonically vibrating surgical tool for removing cement (7) in artificial joint revision surgery has an ultrasonic vibration source operationally coupled to a working tip (5) that acts on the cement (7) in the lumen (8) of a bone such as a femur (1). When acting on the cement (7), the tool vibrates at substantially a single resonant frequency. If the working tip (5) comes into contact with a hard material such as the bone wall (6) of the femur (1), additional supplemental vibrations are generated at other frequencies. The tool is equipped with a microphone or other vibration detector to pick up these supplemental vibrations, which may be in the audible or ultrasonic range. If supplemental vibrations are detected at a frequency characteristic of contact between the working tip (5) and bone, the user of the tool is warned and the operation of the tool is interrupted.

The invention relates to the field of grinding wheel dressing, in particular to a novel binder accurate grinding roller grinding wheel and a surface dressing method.The device adopted in the surface dressing method comprises a rack, a control table and a grinding wheel frame are fixedly arranged at the upper end of the rack, a grinding wheel cover is fixedly arranged on one side of the grinding wheel frame, and a grinding wheel body is rotationally installed in the grinding wheel cover; a driving motor is fixedly arranged at the bottom of the rack and is in transmission connection with the grinding wheel body through a reduction gearbox, a first sliding table is fixedly arranged at the upper end of the rack, a second sliding table is slidably installed on the first sliding table in a matched mode, a dressing table is slidably installed at the upper end of the second sliding table in a matched mode, a clamping base is fixedly arranged on the dressing table, and a dressing pen is fixedly clamped in the clamping base. The progressive machining and finishing process combining rough finishing and fine finishing can be achieved on the grinding wheel body, operation is easy, finishing precision is high, the vibration problem can be thoroughly solved according to feedback data of vibration detection, and finishing quality can be improved.

The utility model provides a high-sensitivity vibration detection circuit. The high-sensitivity vibration detection circuit comprises a power supply module, an analog front end, a digital-to-analog conversion module and a microcontroller, the power supply module outputs 2.5 V voltage to the analog front end and the digital-to-analog conversion module, and an LTC6655 band-gap reference voltage source chip is adopted; the analog front end provides three paths of differential mode vibration sensor signal input channels, and is used for accessing three sensors to detect vibration signals in x, y and z three-axis directions and inputting the vibration signals into the digital-to-analog conversion module; the digital-to-analog conversion module converts an analog signal output by the analog front end into a 24-bit digital signal and sends the 24-bit digital signal to the microcontroller; and the controller encodes the received digital signal and transmits the encoded digital signal to an upper computer through a UART (Universal Asynchronous Receiver Transmitter) interface.

The invention relates to the technical field of vibration monitoring, in particular to an abnormal vibration detection method for a tower drum of a wind generating set, which comprises the following steps of: acquiring a tower drum vibration signal and duration time, identifying characteristic parameters, acquiring a three-time vibration sequence under different working conditions and analyzing change amplitude; and verifying event completion and amplitude range output effective signals to generate a control record, adjusting a reference value based on the record to update an execution parameter, filling a control instruction to activate a trigger signal write-in interface, and obtaining a tower drum abnormal vibration detection automatic control information set. According to the invention, through statistical analysis of the vibration event trigger signal and the duration time, continuous fluctuation tracking in the operation state of the tower drum is realized, the dynamic comparability of vibration change and the real-time accuracy of abnormity identification are enhanced, misjudgment caused by short-time interference is eliminated, the detection result is enabled to adapt to environmental change, closed-loop control is formed, and the detection accuracy is improved. Automatic abnormal early warning and continuous monitoring are realized, and the stability and response efficiency of vibration detection are improved.

The present application relates to the technical field of noise diagnosis, in particular to a method and device for identifying abnormal sound source applied to a vehicle transmission system, the method comprising: acquiring abnormal sound noise data, and confirming an abnormal sound generation period according to the abnormal sound noise data; acquiring transmission system vibration data, and performing time-frequency domain analysis on the transmission system vibration data and the abnormal sound noise data according to the abnormal sound generation period to obtain abnormal sound time domain data; the transmission system vibration data is obtained by vibration detection of the vehicle transmission system at a previous time; performing cross-correlation identification of the abnormal sound source according to the abnormal sound time domain data to obtain an abnormal sound source identification result; the abnormal sound source identification result is used to represent that the abnormal sound source is a gearbox and / or a drive axle. By considering the state of strong coupling connection between the gearbox and the drive axle in the vehicle transmission system, cross-correlation analysis is performed on the abnormal sound time domain data to identify the abnormal sound source, thereby improving the accuracy of identifying the abnormal sound source of the vehicle identification system.

We provide the system. [Solution] A processing device that uses a facial recognition algorithm to detect human features from video data and compares them with a subject list, A device that monitors abnormalities in entrances and windows using a vibration detection unit and an opening / closing detection unit, A system that analyzes a person's behavior and facial expressions to quantify the degree of danger and issues a warning based on that evaluation, A means by which the information processing unit shares information about abnormal individuals with multiple external organizations, A means of transmitting a warning to a mobile communication device when an anomaly is detected, A system that includes this.

The utility model discloses a physical cooling instrument detection device, which comprises a detection box body (12), and is characterized in that a fixed plate (4) is fixed at the upper end in the detection box body (12), telescopic mechanisms are connected to two sides of the fixed plate (4), clamping mechanisms are connected to the telescopic mechanisms, vibration detection mechanisms are mounted on the clamping mechanisms, and the detection box body (12) is fixed on the detection box body (12). A vibration detection mechanism is arranged in the detection box body (12), a temperature detection mechanism is connected to one side in the detection box body (12), a noise sensor and a humidity sensor are installed on the side wall in the detection box body (12), a control panel (14) is connected to one side of the detection box body (12), and the control panel (14) is connected with the vibration detection mechanism, the temperature detection mechanism, the noise sensor and the humidity sensor.

The present disclosure relates to an integrated cooker and an air duct system, a control method, the air duct system comprising an air duct structure and a fan system arranged in the air duct structure, the fan system comprising a motor; the air duct system further comprises: a vibration detection module for detecting a vibration signal of the motor; a noise detection module for detecting a noise signal of the air duct structure and the fan system; a distance measurement module arranged at a head of an integrated cooker where the air duct system is located, for detecting a distance between a user and the integrated cooker; a control module in communication connection with the vibration detection module, the noise detection module, the distance measurement module and the motor respectively, the control module acquiring detection results of the vibration detection module, the noise detection module and the distance measurement module, and controlling a rotating speed of the motor. The present disclosure can control the rotating speed of the motor in real time according to noise energy and user distance, so as to avoid that a user perceives too large noise when using the integrated cooker.

This electronic auscultation device comprises: a first diaphragm that is in contact with a specimen; a second diaphragm that forms a closed space together with members including the first diaphragm while at least the first diaphragm is in contact with the specimen; and an output means for outputting a vibration signal indicating the vibration state of the second diaphragm. The size of the second diaphragm is smaller than the size of the first diaphragm, and the Young's modulus of the second diaphragm is smaller than the Young's modulus of the first diaphragm.

This invention provides a charging control system, charging device, charging system, charging control method, and program that take disaster prevention into consideration. [Solution] The charging control system 3 comprises a control unit 51 and a vibration detection unit 6. The control unit 51 controls the charging operation of a charging device 11 that charges the battery 101 of the electric vehicle 100. The charging device 11 is connected to the electric vehicle 100 via a charging cable 41. The vibration detection unit 6 detects vibrations of the charging device 11. The control unit 51 can switch between a first mode and a second mode. In the first mode, it charges the battery 101. In the second mode, it stops charging the battery 101. If the vibration detection unit 6 detects vibration while the control unit 51 is operating in the first mode, it switches to the second mode. If the vibration stops while the control unit 51 is operating in the second mode, it switches back to the first mode.

The application provides a conical double-clad fiber probe integrated with photoacoustic excitation and detection, which integrates pump light excitation and detection light sensing through a conical double-clad fiber, integrates functions such as photoacoustic excitation, gas-light interaction and interference detection in a micro probe, effectively simplifies the device structure, reduces the volume, and significantly improves the integration and compactness. At the same time, the conical part of the conical double-clad fiber can realize lateral diffusion of pump light, so that it can fully act on the measured gas in the closed gas chamber without additional configuration of optical components such as mirrors, and the problem of weak photoacoustic signal in a small space is improved. In addition, the application uses a fiber Fabry-Perot interference structure to complete vibration detection with a polyimide diaphragm, replacing the traditional electronic detector, having excellent anti-electromagnetic interference capability, and can accurately identify weak vibration signals, effectively improving the sensitivity and operation stability of gas detection.

The invention provides an elevator operation vibration detection and adjustment system and method, and relates to the technical field of elevator safety. The system comprises a parameter learning unit, a data acquisition unit, a data processing unit, a control unit and a maintenance interaction unit, the method comprises the following steps: pre-learning key parameters of a shaft, collecting the running state and vibration data of the elevator in real time, realizing accurate recognition of vibration abnormity through multi-dimensional filtering and spectral analysis, executing a grading response strategy in combination with abnormal positions, types and degrees, including maintenance early warning, running parameter dynamic adjustment or running prohibition, and assisting in maintenance through a maintenance interaction unit. Manual on-site detection is not needed, vibration hidden dangers can be actively recognized and dynamically controlled, the risk that a vibration reduction mechanism conceals mechanical abnormity is avoided, elevator operation safety and riding comfort are improved, and meanwhile maintenance efficiency is improved.

The application discloses a kind of fast quantitative distributed optical fiber vibration detection method and system based on frequency comb, belong to optical fiber sensing field technical field, method includes: S1, design target frequency comb, including the comb tooth interval Δf of the target frequency comb is designed C And the initial phase of the target frequency comb;S2, the target frequency comb is converted into time domain signal, and the time domain signal is modulated on probe light, obtains modulated time domain optical carrier signal;S3, the modulated time domain optical carrier signal is carried out optical domain frequency shift and probe pulse modulation, obtains modulated frequency comb pulse sequence;S4, the frequency comb pulse sequence is input to the optical fiber FUT to be measured, and quantitative distributed optical fiber vibration detection is carried out.The application realizes the modulation of target frequency comb on probe pulse, compresses single detection time, to improve the frequency response capability to external disturbance, can realize the high signal-to-noise ratio detection of dynamic signal.