252 results about "Vibration measurement" patented technology

The invention provides a vibration measurement device for motor equipment, and relates to the field of vibration measurement, and the device comprises a main body support frame, and the left and right sides of the top of the main body support frame are provided with self-locking worm gears A; a mounting angle adjusting shaft is rotationally mounted on the inner side of the main body supporting frame; self-locking worms A are arranged on the left side and the right side of the mounting angle adjusting shaft; the self-locking worm A is matched and connected with the self-locking worm gear A; guide pieces are arranged on the left side and the right side of the main body supporting frame. A mounting angle adjusting part is arranged in the middle of the mounting angle adjusting shaft; the vibration testing device can test vibration of motor equipment at different installation angles and output angles, the universality and accuracy of the vibration testing result of the device are improved, and the problem that the vibration amplitude of the motor equipment is affected to a certain extent due to installation modes at different angles is solved. And a vibration measurement result obtained by only testing plane installation does not have universality.

The invention discloses an ultrasonic welding quality online detection system and method, and belongs to the technical field of laser non-contact measurement. According to the invention, the laser vibration measurement probe is rigidly coupled to the welding head to construct a follow-up-common-optical-path measurement unit, so that synchronous acquisition of vibration signals with zero mass loading is realized; further extracting an attenuation section after welding is finished from the signal, and inverting an equivalent modal damping ratio representing an interface energy dissipation state based on an exponential attenuation model; meanwhile, multi-dimensional physical indexes such as an energy transfer efficiency index Itrans and an input stability index Iin are calculated, and in combination with an energy absorption state index, collaborative fusion is carried out through a weighted fusion formula to obtain a comprehensive quality score; and finally, realizing quality attenuation early warning based on time sequence trend analysis of a scoring sequence. On-line sensing of the deep dynamic state in the welding process is achieved, the early defect recognition sensitivity and the system anti-interference capacity are remarkably improved, and the predictive maintenance capacity of quality degradation is achieved.

The invention discloses an acoustic excitation digital modulation noise reduction method and system for laser acoustic vibration detection and application. Comprising the following steps: step 1, acquiring single-point measurement time sequence parameters of laser vibration measurement equipment, step 2, measuring response characteristics of an audio excitation device, and determining pre-stabilization time required by an audio excitation signal from starting to reaching a stable amplitude; step 3, constructing an on-off keying modulation function, generating a digital gating function according to the time sequence parameter and the pre-stabilization time, and performing time domain multiplication on the audio excitation signal and the digital gating function to generate a modulated intermittent audio excitation signal; and 4, controlling the audio excitation device to play intermittent audio excitation signals, and synchronously triggering the laser vibration measurement equipment to scan and collect the measurement points on the surface of the object to be measured according to the time sequence parameters. Through the on-off keying digital modulation technology, audio excitation can be started only in the effective detection time period of laser vibration measurement, and therefore the average noise level and equipment power consumption are remarkably reduced.

The invention belongs to the technical field of nuclear power, and particularly relates to a nuclear power plant vibration measurement method and device based on a dynamic range technology. Comprising the following steps: sampling vibration signals after gain amplification by using a plurality of analog-to-digital converters with different measuring ranges to obtain an initial digital sequence; the initial digital sequence comprises a signal amplitude; performing amplitude region division on the initial digital sequence according to the magnitude of the signal amplitude to obtain a plurality of signal segments in different amplitude regions, and endowing the analog-to-digital converter with a target weight according to the saturation of the signal segments in the measuring range of each analog-to-digital converter; the saturation is the ratio of the signal amplitude to the upper limit of the measuring range of the analog-to-digital converter; the target weight comprises sub-weights respectively corresponding to a plurality of different signal segments of the analog-to-digital converter; and performing weighted fusion and splicing on the signal segments based on the sub-weights of the analog-to-digital converters in the different signal segments to obtain a target sampling signal.

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.

The invention belongs to the technical field of laser vibration measurement, and provides a self-focusing laser Doppler vibration measurement method and system capable of resisting self-vibration of an optical fiber, and the method comprises the steps: adding a compensation light path which is used for sensing and generating reference light which is equal to an interference signal in amplitude and is opposite to the interference signal in real time in a Doppler vibration measurement light path, and taking the minimum mean square error as a self-adaptive matching criterion; interference phases obtained by synchronous demodulation of the compensation light path and the main light path are subjected to adaptive matching and cancellation in amplitude and phase dimensions, residual errors of vibration of the vibration measurement system and other environmental interferences are suppressed below noise of the vibration measurement system, and the purpose of balancing and weakening optical fiber vibration interferences in an instrument is achieved. The influence of the vibration factor of the instrument is reduced, and the interference influence is accurately eliminated through amplitude and phase matching by a demodulation algorithm corresponding to a compensation light path; meanwhile, by dynamically observing and updating the return light intensity threshold, low-frequency disturbance is resisted, and accurate automatic focusing is achieved.

A hard disk drive suspension includes first piezoelectric elements provided at a first position, and second piezoelectric elements provided at a second position. A conductor is connected to the first piezoelectric elements. Conductors are connected to the second piezoelectric elements, respectively. A measurement device includes a vibration signal generation unit which supplies vibration signals to the second piezoelectric elements, a vibration measurement unit which detects vibration generated at the suspension, and a ground connection unit. The conductor electrically connected to the first piezoelectric elements is connected to a ground via a resistor of a ground connection unit.

The invention discloses a monitoring system and method for determining an abnormal geologic body based on distributed optical fiber sound wave vibration, and relates to the technical field of distributed optical fiber sound wave detection.The monitoring system comprises a distributed optical fiber sensing unit, a signal excitation unit, a photoelectric demodulation unit, a signal processing and analyzing unit, a result recording and outputting unit and the like; the distributed optical fiber is used for continuously collecting stratum vibration response; the signal excitation unit applies controllable disturbance to a known reference position to induce a potential abnormal geologic body to generate an inactive excitation response signal; the photoelectric demodulation unit performs phase demodulation on backscattered light transmitted back by the optical fiber to form distributed vibration measurement data; and the signal processing and analyzing unit is used for filtering and denoising the data, establishing a quantitative mathematical model of a signal incident angle and signal intensity, solving an epicentral distance and an incident angle and calculating the spatial position of an abnormal geologic body by combining propagation attenuation correction and least square inversion, and is suitable for dangerous section identification and avoidance decision before mining and construction.

A measuring transducer includes: a transducer module including a housing and a coil within and connected with the housing; and, set in the transducer module, a transducer module including a tube and a magnet secured on a middle segment of the tube. The tube wall is so formed that a directrix of a channel surface of the middle segment extends outside a first reference plane of the measuring transducer defined by first and fourth reference axes, and the magnet is secured on the middle segment such that a second reference plane of the measuring transducer defined by second and fourth reference axes is parallel to a third reference plane defined by third and fifth reference axes or that the second and third reference planes intersect one another to form an angle of intersection of no more than 1°.

The invention relates to a phase adaptive dynamic calibration compensation method and system based on temperature drift compensation, belongs to the technical field of vibration testing, and solves the problems of poor wide temperature precision of micro-vibration phase calibration, weak multi-frequency adaptation, incomplete full-link compensation, calibration acquisition conflict and fast aging failure in the prior art. The method comprises the following steps: determining an original calibration signal based on an analysis frequency, calculating an initial phase difference according to the original calibration signal, determining a first time compensation amount according to the initial phase difference, and carrying out first calibration compensation; acquiring environment temperature, and establishing a phase compensation model based on the environment temperature, the analysis frequency and the initial phase difference; obtaining the node temperature of the signal transmission link, determining a second time compensation amount by using the phase compensation model, and carrying out second calibration compensation; the information transmission link comprises a plurality of signal transmission nodes. According to the invention, wide temperature range, stable full-link calibration, parallel calibration and acquisition, and adaptive dynamic calibration compensation are realized, so that the micro-vibration measurement accuracy is improved.

The invention relates to a pneumatic membrane structure fluid-structure interaction multi-physics field synchronous test method, which relates to the technical field of vibration measurement, and comprises the following steps: conformally embedding a flexible capacitive sensor array in the surface of a pneumatic membrane structure, detecting mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement through capacitance value change (electrical characteristics), and measuring the displacement of the flexible capacitive sensor array; and the capacitance value change rate delta C / C and the displacement delta x are in a linear proportional relationship. According to the pneumatic membrane structure fluid-solid coupling multi-physics field synchronous test method, a flexible capacitive sensor array is conformally embedded in the surface of a pneumatic membrane structure, and mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement is directly detected by using capacitance value changes; wherein the linear proportional relation between the capacitance value change rate delta C / C and the displacement delta x is directly determined by the electrode distance and the dielectric constant of the capacitive sensor, so that the physical directness of vibration wave measurement is realized, the error caused by indirect calculation depending on a traditional strain gauge or an optical method is avoided, and the vibration wave displacement measurement precision is remarkably improved to + / -0.5% full scale.

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 discloses a pneumatic control valve fault diagnosis method and device based on microwave vibration measurement, and relates to the technical field of industrial process control. The method comprises the steps that a non-contact control valve rod vibration signal is collected; constructing a multi-scale time-frequency domain dual-channel feature fusion network structure, and extracting time sequence dynamic features of a valve rod vibration signal in a time domain branch through combination of multi-scale one-dimensional convolution and a bidirectional gating circulation unit; the frequency domain branch converts the one-dimensional signal into a two-dimensional time-frequency image, and uses a multi-scale two-dimensional convolutional network to extract spectrum texture features; introducing a channel attention mechanism to adaptively learn feature importance weight, and adopting a cross attention mechanism to deeply fuse time-frequency domain features; and based on a preset control valve fault category, performing fault classification on the fused control valve time-frequency features to obtain a control valve classification result. According to the method, complementary information of different modes is fully excavated, fault features of the control valve are fully extracted, and therefore accurate diagnosis of the faults of the control valve is achieved.

According to the present invention, a system and method for the continuous and automated monitoring of body tremors are provided. The system comprises a wearable device and a web portal and / or application that communicates with the wearable device to process vibration measurements. The wearable device comprises: - at least an inertial sensor or an accelerometer that measures accelerations; - at least a communication unit that transmits the measurements to the web portal and / or application; - at least a storage unit; - at least a microcontroller that receives data and sends them to the storage unit and the communication unit; said microcontroller comprising a timer for switching the device on or off; - at least an energy supply source for the device.

The purpose of the present invention is to provide a vibration analysis processing device that is capable of identifying the location of occurrence of an event without being affected by an installation environment of an optical fiber.　A vibration analysis processing device 10 comprises: an input unit 11 that receives input of vibration data which is transmitted to an optical fiber cable 50 and which has been measured by a vibration measuring instrument 20; and a computation processing unit 12 that divides the optical fiber cable 50 into a plurality of sections in a distance direction, and, on the basis of the vibration data, generates, for each of the sections, a bit sequence in which bits are given indicating whether or not a specific vibration of a specific frequency component is occurring, that generates a determination value sequence in which moving average values calculated for the bit sequence with an arbitrary window size in the distance direction are arranged in the distance direction, and that detects a point or an area where the moving average value exceeds an arbitrary threshold value in the determination value sequence.

The application discloses a kind of visual nondestructive flaw detection systems and methods without destroying the integrity of wind power blade, it is related to nondestructive testing field, the system includes: signal excitation module, laser vibration measurement module, scanning execution module, data acquisition module, data processing module, visual display module and system control and communication module.Wherein, scanning execution module is used to drive laser vibration measurement module to move according to scanning track and vibration response signal is collected at each measuring point by synchronously scheduling laser vibration measurement module, and the defect information of blade is identified using data processing module;Using visual display module, the position, type and appearance of defect are presented in three-dimensional visual manner;Using system control and communication module, the automatic flaw detection process of system is realized.The nondestructive flaw detection system of the application has the characteristics of automatic path scanning, synchronous control mechanism and defect three-dimensional visualization, and can realize long-distance, non-contact precision detection.

The invention discloses a precise measurement method for object surface out-of-plane displacement under high-frequency micro-vibration. The method comprises the following steps: exciting an object to generate high-frequency steady-state vibration through a vibration exciter, freezing a surface state at any vibration position of the object by adopting stroboscopic pulse laser with strictly same frequency as the vibration, and forming a shear speckle field by utilizing a Michelson interferometer comprising a piezoelectric ceramic driving phase-shifting mirror. The movement of the phase shift mirror and the acquisition of the high-speed camera as well as the actions of the stroboscopic laser and the vibration exciter are synchronously controlled through the double-signal controller, so that the accurate acquisition of multiple phase shift speckle interference images is realized. The image is processed based on a four-step phase shift algorithm, and the phase difference of the vibration position is calculated, so that the out-of-plane displacement derivative and the out-of-plane displacement in the shearing direction are calculated. According to the invention, the signal-to-noise ratio and the sensitivity of vibration measurement are obviously improved, and the method has full-field, non-contact and micro-nano displacement resolution capabilities, and is suitable for the fields of material nondestructive testing and structure health monitoring.

The present application relates to a kind of distributed optical fiber microseismic sensing device and tunnel monitoring method, belong to microseismic monitoring technical field, distributed optical fiber microseismic sensing device includes multiple installation in the same tunnel section vibration measurement sensitizing component, multiple vibration measurement sensitizing component is connected by distributed sensing optical cable;Distributed sensing optical cable in vibration measurement sensitizing component is arranged along tunnel radial, for monitoring the vibration signal of the development of the hidden crack and micro crack of surrounding rock along radial near working face.In monitoring, the first end or tail end of distributed optical fiber microseismic sensing device one vibration measurement sensitizing component is sequentially connected with distributed optical fiber demodulator, monitoring host and monitoring center, and constitutes microseismic sensing monitoring network.The method for tunnel monitoring using the above-mentioned distributed optical fiber microseismic sensing device can realize the perception of vibration signal along axial and along radial, overcome the defect that distributed sensing optical fiber is only sensitive to axial vibration signal and not sensitive to radial vibration signal.

The present application relates to a kind of vibration isolation device low-frequency transfer characteristic test system and test method, belong to spacecraft vibration reduction field.A kind of vibration isolation device low-frequency transfer characteristic test system, comprising: disturbance source simulator, vibration-isolated component, spacecraft simulation cabin, cabin unloading device, vibration-isolated component unloading device, suspension device, mass center alignment component and micro-vibration measuring device;Wherein, the disturbance source simulator is installed on the side plate of spacecraft simulation cabin, and the spacecraft simulation cabin is hung on the suspension device by the cabin unloading device;The vibration-isolated component is used to be set on the vibration isolation device to be tested, and is hung on the suspension device by the vibration-isolated component unloading device;The mass center alignment component is installed on the bottom plate of the spacecraft simulation cabin;The micro-vibration measuring device is used to test the micro-vibration parameter of different positions and the frequency characteristic of test system.

A method for correcting abnormal operation of equipment includes obtaining a vibration data set including vibration measurements recorded by one or more vibration sensors while operating the equipment during a time period, obtaining operator comments including observations from an operator characterizing operation of the equipment during the time period, analyzing the vibration data set and the operator comments using one or more machine learning models to identify the operation of the equipment as normal or abnormal, and initiating a corrective action responsive to identifying the operation of the equipment as abnormal. In some embodiments, the method includes generating model reasoning indicating a reason why the operation of the equipment is identified as normal or abnormal by the one or more machine learning models.

The invention discloses an aero-engine blade non-contact vibration measurement system and method, and belongs to the technical field of engine testing. The system comprises an optical fiber sensor, a rotating speed reference signal generation unit, a sensor clamp and a signal processing unit, the optical fiber sensor is arranged at a specific circumferential position of an engine case; the rotating speed reference signal generation unit is matched with the corresponding optical fiber sensor through an optical mark on the rotating shaft to obtain a rotating speed reference pulse signal of each rotation; the sensor clamp fixes and positions the optical fiber sensor; the signal processing unit processes the collected signals to obtain blade vibration parameters. The measuring method comprises the steps of setting optical marks, arranging optical fiber sensors, collecting signals and analyzing data, and completing blade vibration characteristic detection. The non-contact design is adopted, the problem of obtaining high-precision rotating speed reference signals in a complex rotating disc cavity is solved, the precision and stability of blade vibration measurement are improved, and reliable guarantee is provided for safe operation of an engine.

The invention discloses a strip mine blasting vibration measurement point positioning method and system based on a three-dimensional model of a blasting area, and aims to solve the technical problems that traditional blasting vibration monitoring points are high in selection randomness and low in positioning precision, and the vibration attenuation rule of a complex blasting network cannot be accurately reflected. The method comprises the following steps: performing high-precision aerial survey and three-dimensional modeling on a blasting area by using an unmanned aerial vehicle, automatically searching an optimal vibration measurement point layout in a three-dimensional terrain model of the blasting area through a multi-target intelligent optimization algorithm in combination with blasting hole coordinates and a blasting time sequence, and realizing centimeter-level precision vibration measurement point field positioning through high-precision RTK equipment. According to the method, intelligent, high-precision and scientific vibration measurement point arrangement is realized, the scientificity and precision of vibration measurement point arrangement are improved, the method can adapt to various complex blasting networks such as row-by-row blasting and hole-by-hole blasting, and a reliable data basis is provided for blasting vibration attenuation law research.

This application discloses a method, apparatus, medium, and device for selecting vibration measurement points based on radar. The method includes: acquiring echo data of the object under test collected by a radar device; determining multiple candidate vibration points based on the echo data; estimating the stationary clutter component of each candidate vibration point to obtain the stationary clutter component; filtering out stationary measurement points from the candidate vibration points based on the stationary clutter component to obtain at least one vibration measurement point; and performing vibration measurement on the object under test based on each vibration measurement point. Using this application embodiment, stationary measurement points that do not vibrate can be filtered out from the candidate vibration points, thereby improving the accuracy of radar vibration measurement results.

The embodiment of the specification provides a micro-vibration on-orbit measurement system and a data processing method of a spacecraft, wherein the system comprises: an acceleration sensing module, which is used for acquiring an acceleration signal and determining acceleration information based on the acceleration signal; a signal conditioning module, which is used for powering the acceleration sensing module, acquiring acceleration information and temperature information of the acceleration sensing module, and conditioning the acceleration information and the temperature information; a rotation measurement module, which is used for acquiring an angular vibration signal and determining angular vibration information based on the angular vibration signal; and a control storage module, which is used for communicating with a spacecraft platform, controlling the acceleration sensing module, the signal conditioning module and the rotation measurement module, receiving and storing data of the acceleration sensing module, the signal conditioning module and the rotation measurement module. Since a modular design is adopted, the load position can be arranged flexibly, and interference isolation is arranged between the modules, so that the accuracy and the measurement precision of the data are improved.

There is provided a building facility vibration measurement device that can easily ascertain whether specs are sufficient for measurement of vibration of a building facility. A building facility vibration measurement device includes: an acceleration detection unit configured to detect acceleration; an acceleration collection unit configured to collect the acceleration detected by the acceleration detection unit; an accuracy calculation unit configured to calculate detection accuracy of the acceleration from information on the acceleration collected by the acceleration collection unit; and a judgement unit configured to, based on the detection accuracy calculated by the accuracy calculation unit, judge whether vibration of a building facility can be measured.

The invention provides a non-contact laser testing method for acoustic emission of a ceramic-based composite material in an extreme thermal environment, and relates to the technical field of nondestructive testing, the non-contact laser testing method comprises the following steps: S1, preparing a glass bead composite coating, and coating the surface of a composite material test piece with the glass bead composite coating; s2, building a non-contact monitoring system; s3, carrying out a thermal coupling experiment and signal acquisition; and S4, performing multi-stage noise reduction processing on the non-contact signal. According to the method, the surface of the composite material test piece is coated with the quartz glass beads, and the laser reflectivity of the surface of the ceramic-based composite material can be improved to 60% or above from 10% or below in an environment of 1500 DEG C by utilizing the directional regression reflection characteristic of the quartz glass beads, so that the amplitude of a laser vibration measurement signal is remarkably enhanced. And meanwhile, aiming at the characteristics that the noise of the laser vibration meter is large and the noise is nonlinearly increased along with the frequency and the like, the signal noise level can be effectively reduced and the characterization capability of the acoustic emission waveform can be improved through median filtering, least square smoothing filtering, self-correlation filtering and other methods.

A diaphragm-type optical fiber micro-vibration measurement apparatus and method based on a single-pass band microwave photonic filter. The apparatus comprises a broadband light source module (1), a three-port circulator (2), an AU diaphragm optical fiber micro-vibration sensor (3), an erbium-doped optical fiber amplifier (4), a polarization controller (5), an electro-optical modulator (6), a power supply module (7), a radio-frequency source module (8), a dispersion compensation optical fiber (9), a photoelectric detector (10), a data acquisition card (11) and a computer (12), wherein the broadband light source module (1) is connected to one port of the three-port circulator (2) by means of an optical fiber connection line.

The invention relates to a multi-point synchronous vibration meter with strong anti-interference performance based on a common-arm interference structure, and aims to solve the problems that a traditional non-contact vibration meter can only perform single-point vibration measurement and is low in measurement efficiency and measurement signals are easily influenced by environmental factors. The optical energy utilization efficiency and the system compactness are remarkably improved, meanwhile, multiple paths of interference signals are integrated in one system, the frequency division multiplexing technology is adopted, different modulation frequencies are distributed to measuring points at different positions in a measuring light path, multi-point synchronous vibration measurement is achieved, and the data collection flux and the space coverage capacity are effectively improved. Benefited from the common-arm interference optical path structure design of the system, the vibration meter can effectively suppress common-mode noise, the anti-interference capability and stability of the system in a complex environment are enhanced, and an additional active compensation device is not needed.

The invention discloses a multilayer vibration isolation measurement and control device with a rigid-flexible coupling structure and a method. The multilayer vibration isolation measurement and control device comprises a bottom supporting part, a vibration reduction part, an annular structure part, a transmission part, a vibration detection part and a control part, the bottom supporting part comprises a bottom plate and a spring damping mechanism; the vibration reduction part comprises a bottom-layer quasi-zero stiffness vibration isolation mechanism, a first-layer quasi-zero stiffness vibration isolation mechanism and a second-layer quasi-zero stiffness vibration isolation mechanism; the annular structure part comprises a flexible inner ring, a flexible outer ring and a flexible center; the transmission part comprises a vibration excitation system; the vibration detection part and the control part are used for detecting and controlling the vibration of the flexible beam; the device can be used for researching vibration and control of the multilayer rigid-flexible coupling structure under the low-frequency up-and-down disturbance effect, and has a certain application prospect in the field of vibration measurement and vibration reduction control of the spatial multilayer rigid-flexible coupling structure.

The application discloses a zero-intervention blade tip timing signal extraction method based on multi-feature fusion, and belongs to the technical field of non-contact vibration testing of rotary machines. The application firstly constructs a candidate time window to intercept a pulse section based on a key phase signal; secondly, four types of arrival time features, i.e. a peak value moment, an energy barycenter moment, a cross-correlation peak value moment and a fitted zero-crossing point moment, are extracted in parallel in the candidate window; then, local signal-to-noise ratios and other signal quality indexes are calculated, feature fusion weights are adaptively determined, and a fused arrival time is obtained; finally, a median absolute deviation is used for outlier rejection, and a stable and reliable arrival time sequence is output in combination with adjacent blade time interval consistency verification. The application can significantly improve the arrival time extraction precision and robustness under the conditions of low signal-to-noise ratio, waveform distortion and working condition fluctuation, and is suitable for blade health monitoring and online vibration measurement in a closed casing environment of an aero-engine, a gas turbine and the like.