15 results about "Transient vibration" patented technology

The invention relates to the technical field of structure health testing, in particular to a water conservancy pump station concrete structure leakage real-time monitoring and early warning system which comprises the steps that a distributed sensing array deployed on the surface of a concrete structure is used for collecting structure vibration signals excited by operation of a pump set; through static topology mode recognition, a continuous high-coherence abnormal path representing potential leakage is preliminarily judged; the method comprises the following steps: performing dynamic arbitration on time synchronism of response of each point on a path by using a static primary screening and dynamic confirmation mechanism and further using a transient vibration event generated in a system such as start and stop of a pump set as a verification signal, and outputting an early warning only after the path is confirmed to be a real physical channel. And unavoidable working condition switching events in structure operation are converted into a decisive basis for distinguishing real structure damage and benign state drift, so that the technical problem of false alarm caused by reference drift of a passive monitoring system is solved.

The utility model discloses a vibration and noise reduction type screen body structure of a high-efficiency vibrating screen, relates to the technical field of vibrating screens, and aims to solve the problem that in an existing vibration reduction scheme, passive vibration reduction elements such as springs or rubber pads are mostly additionally arranged, but bidirectional control of screen mesh fastening and vibration conduction is difficult to be considered at the same time. A set of vibration reduction rubber strips are installed between the containing beam and the screen in a pressed mode, a rotating groove and a driving groove are formed in the top face of the containing beam, a locking assembly is arranged in the rotating groove, a driving assembly is arranged in the driving groove, a groove is formed in the bottom face of the screen, a hanging rod is arranged in the groove, and the hanging rod is in sliding connection with the locking assembly. An elastic interlayer is formed by the vibration reduction rubber strips arranged between the screen and the placing beams, transient vibration energy generated by material impact can be effectively absorbed, mechanical energy is converted into heat energy through viscoelastic deformation of high polymer materials in the rubber strips, and the strength of vibration transmitted to the screen body is reduced.

This invention belongs to the technical field of information technology, specifically disclosing a method and system for AGC load allocation in hydropower stations considering vibration risk. The method includes: acquiring real-time tilt angle time-series data of the unit bearing housing and guide vane support; processing the real-time tilt angle time-series data using preset high-pass and low-pass filters; the high-pass filter output representing rapid fluctuation components changing from seconds to minutes, and the low-pass filter output representing slow drift components changing from hours to days; calculating the transient vibration impact index and the long-term structural degradation index based on the amplitude characteristics of the rapid fluctuation components and the cumulative trend of the slow drift components, respectively; the transient vibration impact index reflecting the instantaneous mechanical stress level caused by the current load adjustment; the purpose of this invention is to solve the problem in the prior art of how to simultaneously identify and weigh the transient vibration risk caused by rapid tilt angle changes and the long-term structural degradation risk caused by slow tilt angle drift in load allocation decisions.

The present application relates to the technical field of structural health testing, and particularly relates to a real-time monitoring and early warning system for concrete structure leakage of water conservancy pump station, comprising: collecting structural vibration signals excited by pump set operation by using a distributed sensing array deployed on the surface of the concrete structure; preliminarily determining a continuous high-coherence abnormal path representing potential leakage by static topology pattern recognition; and further using a transient vibration event such as pump set start-stop as a verification signal to dynamically arbitrate the time synchronization of responses of each point on the path, and outputting an early warning only after confirming that the path is a real physical channel, wherein the present application solves the false alarm technical problem of passive monitoring system caused by reference drift by constructing a dual decision mechanism of static preliminary screening and dynamic confirmation, and converting inevitable operating condition switching events in the structure operation into a decisive basis for distinguishing between real structural damage and benign state drift.

The application discloses a digital filtering reconstruction method for lossless audio, and relates to the field of audio filtering reconstruction. Firstly, the transient vibration intensity of the segmented audio frame is extracted in real time to obtain a transient index value, and the transient index value is mapped into a window asymmetry factor by using a nonlinear control curve. According to the factor, a front half cycle attenuation compression and a rear half cycle stretching are applied to a reference window function to generate a dynamic asymmetric window and further obtain dynamic filter coefficients. Finally, the audio is weighted and convoluted by using the dynamic coefficients, and a cross-fading splicing technology is combined to eliminate frame boundary artifacts caused by dynamic adjustment. In this way, dynamic reconstruction can be realized only by relying on time-domain point-by-point modulation of a single set of filters, and the storage of a large number of filter banks or complex offline conversion requirements are completely eliminated.

The application discloses a subway segment post-hole calculation and identification method and system based on knocking impact echo, and the method comprises the following steps: a vertical excitation subway segment is adopted by using an electric knocking device, and transient vibration response and sound radiation signals are synchronously collected by an acceleration sensor and a pickup; the device controls the voltage in real time according to the contact force, controls the knocking pulse waveform and amplitude, and ensures that the elastic wave frequency band covers the resonance range of the segment thickness; the vibration signal is denoised by empirical mode decomposition, the time-frequency spectrum is generated by short-time Fourier transform, and the direct wave and multiple reflected waves are separated; the main frequency, frequency width and sound pressure attenuation rate of the frequency spectrum are extracted, the effective thickness is calculated, a model is constructed, and the hole anomaly is judged; the probability statistical product coupling confidence factor is introduced, a report containing the hole coordinates, depth, range and compactness is output after reaching the standard, and the grouting repair parameters are matched; and reliable technical support is provided for the safety of the iron tunnel structure.

The utility model discloses an on-load tap-changer transient vibration signal acquisition sensing system, which comprises a synchronous controller, an MCU microcontroller and a vibration sensor, and is characterized in that the vibration sensor is in physical magnetic connection with a transformer shell through a magnetic base to acquire vibration signals of the transformer shell; the single-channel constant-current source signal conditioner is electrically connected through a shielding cable, is used for providing direct-current voltage and conditioning and amplifying signals, is connected in series with a vibration acquisition AD converter through a port, and is used for completing conversion from data analog vibration signals to digital vibration signals; according to the utility model, the vibration sensor, the current sensor and the communication subsystem are installed on the housing, close to the on-load tap-changer, of the transformer, a worker does not need to enter a site, and the sensors automatically collect vibration signals and driving motor current signals generated by switching when the on-load tap-changer is switched, and then upload the signals to the cloud platform. And signal storage, display and analysis are realized.

The invention discloses a two-channel mooring rope tension measuring method based on a vibration wave velocity principle. According to the method, a vibration exciter is installed at the end of a cable to generate transient vibration, and two acceleration sensors are arranged in the axial direction of the cable at a certain interval to form a dual-channel measurement array. After the system collects two paths of vibration signals, the direct propagation time difference of vibration waves between the two sensors is accurately extracted by adopting a first arrival wave locking algorithm based on continuous wavelet transform. And then, according to a wave theory physical model, and in combination with a wavelet transform algorithm of wave velocity calculation, the real-time tension of the mooring rope is finally inverted. According to the invention, the method is endowed with extremely strong anti-environmental noise interference capability by utilizing the first-motion wave information and adopting a time-frequency analysis algorithm, and high-precision and dynamic real-time monitoring of the tension of the mooring rope in a complex marine environment is realized. The system is simple in structure and convenient to install, and has important value for ocean safety.

This invention relates to the field of material transportation supervision, specifically to a method and device for supervising the transportation of food materials. The method includes: acquiring and preprocessing physical sensing data within the transport vehicle to obtain a high-frequency three-dimensional acceleration sequence and an ambient temperature sequence; calculating the transient input kinetic energy density and, combined with the structural yield energy threshold, calculating the cumulative structural damage; inputting the cumulative structural damage into the thermodynamic reaction rate equation for dynamic correction to obtain the real-time biochemical decay rate; calculating the remaining dynamic health based on the real-time biochemical decay rate, and then generating control and adjustment commands to change the temperature within the transport vehicle, and controlling the sorting device to perform physical isolation when the material arrives at the production line at its destination. This invention solves the problem of missed detection of material damage due to the disappearance of transient vibrations, effectively avoiding missed detection of hidden internal damage through bottom-level temperature control compensation and forced physical isolation.

The invention discloses a method and a system for identifying the low-speed impact energy level of a composite material, and relates to the technical field of health monitoring of composite material structures. Comprising the following steps: acquiring a two-dimensional time-frequency spectrum corresponding to a transient vibration signal acquired by a single piezoelectric ceramic sensor under the action of low-speed impact of a composite material; the two-dimensional time-frequency spectrum is input into a pre-trained impact energy level recognition model, and the pre-trained impact energy level recognition model comprises a feature extraction module, a residual error convolution backbone network and a classification recognition module which are connected in sequence; the residual convolution backbone network comprises a plurality of residual blocks which are connected in sequence, each residual block is embedded into a multi-scale time-frequency interactive attention module, the multi-scale time-frequency interactive attention module comprises a multi-scale convolution module, a global pooling and convolution module and an interactive fusion module, and an impact energy level classification result is obtained. According to the method, the impact energy level identification can be completed by only one piezoelectric sensor, and the efficient and stable identification of the low-speed impact energy level of the composite material is realized.

This invention discloses a method for extracting features of abnormal vibration signals from intelligent tires based on edge computing, belonging to the field of edge computing technology. The extraction method acquires the transient angular displacement of a rotating object and the rate of change of potential along the energy transmission path. When the transient angular displacement and the rate of change of potential meet preset trigger conditions, the energy transmission path is controlled to switch to a physically disconnected state and a waiting sequence is executed. After the waiting sequence ends, the sensing channel is opened to acquire multi-axis transient vibration data. Based on the energy differences in different axes of the multi-axis transient vibration data, the orthotropic kinetic energy ratio coefficient is calculated. The orthotropic kinetic energy ratio coefficient is compared with a feature threshold to generate a judgment result and the energy transmission path is controlled to reset. This invention, through temporal disconnection and spatial decoupling, suppresses electromechanical crosstalk and centrifugal interference, reducing the probability of missed and false alarms.

A vehicle control method and apparatus. The method comprises: a vehicle control apparatus adjusting a vehicle to a target mode, wherein a motion-sickness prevention function of the vehicle in the target mode is in an enabled state, the motion-sickness prevention function presets whole-body vibration evaluation metrics to be within corresponding preset ranges, the whole-body vibration evaluation metrics being associated with at least one of the following: a frequency-weighted acceleration value, a frequency-weighted acceleration root mean square value, a maximum transient vibration value (MTVV), a motion sickness dose value (MSDV) or a vibration dose value (VDV); and adjusting the torque of the vehicle, such that the whole-body vibration evaluation metrics are within the corresponding preset ranges. Thus, while responding to the real driving intentions of a driver, an output torque is adjusted to alleviate the motion sickness sensation in passengers, thereby achieving the aim of both responding to the real driving intentions of the driver and ensuring the dynamic performance of a vehicle.

The application discloses a wafer edge corner defect and roundness detection method based on contour fitting, and particularly relates to the technical field of wafer edge corner defect and roundness detection, and effectively weakens high-frequency interference components of process microfluctuation and transient vibration in the edge contour through pretreatment and smooth constraint on wafer edge sub-pixel point cloud data; an ideal circle fitting model is constructed and optimized, rotation scanning and conveying vibration factors are introduced into the fitting process, the stability of the reference geometric datum is ensured, reliable identification of the corner defect area and accurate quantification of the corner defect angle and the missing area are realized through systematic analysis of the radial deviation between the real edge points and the fitting circle, the overall geometric quality of the wafer is uniformly represented in the form of roundness deviation index and corner defect position index, the geometric quality index and dynamic environment monitoring data are coupled to correct the sampling position and time synchronization relationship in real time, and systematic errors introduced due to attitude drift, vibration impact and sampling phase dislocation are compensated.

The invention provides a transformer fault diagnosis method, device and system, and belongs to the field of power systems. The method comprises the following steps: acquiring a signal data set of a to-be-diagnosed transformer in multiple short-circuit impact tests; wherein the signal data set comprises a transient vibration signal and a frequency response curve; extracting a vibration characteristic value of the transient vibration signal and a frequency response characteristic value of the frequency response curve; inputting the vibration characteristic value and the frequency response characteristic value into a pre-trained fault diagnosis model to output the state of the transformer winding to be diagnosed; wherein the fault diagnosis model is constructed based on an extreme gradient lifting algorithm, and the optimal weights of the vibration characteristic value and the frequency response characteristic value are determined based on fusion of the particle swarm optimization and the extreme gradient lifting algorithm. According to the invention, the fault state of the transformer winding can be quickly and accurately diagnosed.

This invention provides a method, apparatus, device, and storage medium for detecting surface defects on silicon carbide wafers. The method includes: non-contact broadband ultrasonic excitation based on a line-focused beam and the thermoelastic effect of the silicon carbide wafer surface to obtain a surface acoustic wave (SAW) beam; measuring the surface normal displacement based on the SAW beam and a common-path interference structure to obtain a transient vibration waveform sequence; selecting a crystal orientation beam based on the transient vibration waveform sequence and the anisotropic sound velocity differences in a hexagonal crystal system to obtain a target wave signal component; reconstructing the time-frequency energy distribution of the target wave signal component to obtain a time-frequency energy spectrum; performing group velocity deviation analysis based on the time-frequency energy spectrum and a reference dispersion characteristic curve to obtain a SAW group velocity offset spectrum; and performing spatial connectivity analysis based on the SAW group velocity offset spectrum to obtain the two-dimensional position coordinates of the surface defects and the subsurface damage depth level. This invention improves the quality of wafers in high-temperature manufacturing processes.