40 results about "Wave response" patented technology

The invention belongs to the technical field of grouting compactness detection, and particularly discloses and provides an intelligent detection system and method for the grouting compactness of a bridge prestressed pipeline, and the system comprises a signal acquisition and analysis module, a defect boundary calibration module, a defect recognition and analysis module and a compactness judgment and processing module. The method specifically comprises the steps that acoustic emission and fluctuation response signals are collected in real time through a sensor array arranged on the outer wall of a pipeline, and three-dimensional slurry density distribution is recognized; constructing an inner wall three-dimensional model in combination with a pipeline design drawing, dynamically setting a slurry density threshold value according to a grouting material formula and an environment temperature, and further calibrating a slurry defect boundary; extracting multi-dimensional features such as spatial positions, effective volumes, geometric regularity and types of the defects on the basis of boundaries, and calculating grouting compactness; and finally, according to whether the compactness reaches the standard or not, a grout supplementing early warning instruction or a detection report is automatically generated. According to the method, the reliability of defect identification and compactness calculation under complex working conditions is remarkably improved.

In order to solve the problems that in an existing hemispherical harmonic oscillator quality leveling technology, the inherent rigid axis positioning efficiency is low, and manual intervention is relied on, the invention provides a method for rapidly positioning the azimuth of an inherent rigid axis of a hemispherical harmonic oscillator based on pulse broadband excitation and quasi standing wave response and a corresponding leveling device. Through an analytical expression of a main standing wave and an auxiliary wave in a second-order four-amplitude resonance working mode, a double-excitation vibration stopping system (comprising two knocking hammers and a vibration stopping hammer with the azimuth difference of 22.5 degrees odd times) is ingeniously designed, and the azimuth of an inherent rigid shaft is quickly positioned by combining orthogonal detection signals. According to the method, the limitation on the excitation direction and the detection direction is relaxed, and through the design of the vibration stopping hammer, the positioning efficiency of the inherent rigid shaft is improved, and the extraction precision of residual vibration on the characteristic parameters can be avoided. The formed hemispherical resonator leveling device provides reliable technical support for batch production of high-precision hemispherical resonator gyroscopes.

The invention discloses a forward modeling simulation method for a multidirectional sea wave induction electromagnetic field. The method comprises the following steps: expressing energy distribution of different propagation directions and frequency components through a spectral function; setting external environment input required by forward modeling according to the seawater depth and geomagnetic field parameters of the research area; after parameter setting is completed, electromagnetic response calculation is carried out on each frequency-direction sampling point; component response is called on a preset frequency set and a preset direction set, linear superposition is carried out by adopting a frequency direction correspondence method, and a total electromagnetic field is obtained; and outputting time sequences and frequency spectrum results of the wind wave induction electromagnetic field, the surge induction electromagnetic field and the mixed wave induction electromagnetic field, thereby providing a reference basis for noise analysis, background interference suppression and target signal identification in electromagnetic detection. According to the method, the limitation of a traditional model is broken through, the electromagnetic interference characteristics under the complex sea condition are represented more truly, and reliable support is provided for noise suppression and target recognition in electromagnetic detection.

The application discloses a dual-mode optical coherence elastography device and method. The device comprises an excitation unit for generating an acoustic field; an imaging unit which is an optical coherence tomography system and is used for detecting the vibration of a sample, i.e. a strain response and an elastic wave response; and a coupling unit which has an acoustic reflection surface with a middle through hole and is used for reflecting the acoustic field generated by the excitation unit so that the coupling between a probe light beam emitted by the imaging unit and the acoustic field emitted by the excitation unit is on the same side of the sample. The application uses a multi-beam optical coherence tomography system to emit two or more probe light beams for dual-mode elastography, and can simultaneously obtain high-resolution strain information and quantitative elastic information of the sample, thereby solving the problem that the prior art cannot simultaneously perform strain imaging and elastic wave imaging.

The application discloses a lightning stroke event online guided wave monitoring method and device for a composite material structure, and comprises the following steps: arranging a plurality of piezoelectric sheets in a composite material structure to be monitored to form a sparse piezoelectric array; when the outer surface of the composite material structure to be monitored is struck by lightning, lightning impact force guided wave response mechanical quantities are excited, and the generated mechanical quantities are conducted to the piezoelectric sheets; the lightning impact force guided wave response mechanical quantities are converted into lightning impact force guided wave response signals; the lightning impact force guided wave response signals are transmitted to a data acquisition module through an online sensing mode; the lightning impact force guided wave response signals are subjected to direct current component removal and filtering pretreatment; and through a lightning impact force guided wave response signal imaging monitoring mode of the sparse piezoelectric array, lightning attachment point impact force passive imaging results are constructed. The lightning stroke event online guided wave monitoring method and device can not only improve the quality of lightning piezoelectric guided wave response signals, but also can perform high-precision positioning and imaging on lightning attachment points.

A defect detection method is provided for a pressurized pipe having at least one defect. According to the method, an acoustic source generates a probing wave of a frequency range from 10 kHz to 100 kHz, where the probing wave is scattered by the at least one defect to create a reflected wave; an acoustic receiver measures a wave response to obtain a measured response, where the measured response is attributed essentially to a superposition of the probing wave and the reflected wave; and a computer device processes the measured response to locate the at least one defect.

The present application relates to the technical field of pipeline nondestructive testing, and discloses a pipeline defect diagnosis method based on guided wave technology. The method obtains original guided wave response signals under multiple excitation frequencies through a guided wave sensor array arranged on the outer wall of the pipeline, performs multi-stage analysis and separation on the signals, extracts a set of independent wave mode components directly related to the defects, including longitudinal wave components, torsional wave components and surface wave components. According to the propagation time delay and energy distribution of each component, a multi-dimensional defect feature tensor is constructed, input into a trained pipeline defect discrimination network for feature mapping and abstraction, and a preliminary diagnosis report of the defect category and geometric profile is output. Combined with the pipeline service environment parameters, the physical field coupling correction is carried out to generate the final diagnosis result. The method solves the problems of serious mode aliasing and poor environmental adaptability in the traditional guided wave technology, and realizes accurate identification and positioning of defects.

The application discloses an epitaxial method of a very long wave InAs / InAsSb superlattice infrared detector and relates to the technical field of semiconductor devices. The method comprises the following steps: first, preheating a GaSb substrate; then, growing an InAs layer by applying In beam and As beam; then, growing a transition layer by synchronously increasing As and Sb beams at equal increments; then, growing an InAsSb layer by stabilizing As and Sb beams; then, synchronously adjusting As and Sb beams at equal decrements to restore the initial As beam and make the Sb beam zero; and then, repeating the growth process of each layer to form a superlattice structure, and obtaining a target epitaxial wafer through post-processing. The application realizes smooth transition of the InAs layer and the InAsSb layer by precisely controlling the beam and the V / III ratio, obtains a high-quality superlattice structure, guarantees the very long wave response characteristics, and significantly improves the response rate, the detection rate and the working stability of the detector.

This invention belongs to the field of wave height prediction technology and discloses a wave prediction method that considers the evolution characteristics of the marine environment. The method includes the following steps: (1) collecting historical data on significant wave height, average period, and wind speed of waves in the target sea area and processing the data; (2) performing seasonal trend decomposition on the significant wave height sequence to obtain trend terms, seasonal terms, and residual terms; (3) calculating wind and wave response indices based on wind speed changes, wave average period changes, and significant wave height changes; (4) generating wind and wave response state weights and using these weights to adjust the influence of different historical time steps, different wave height components, and meteorological and oceanographic elements in the prediction process; (5) correcting the prediction contributions of the trend terms, seasonal terms, and residual terms with weights, and reconstructing the predicted future significant wave height. This invention can improve the stability of significant wave height prediction during periods of significant wind speed changes or sea state transitions.

The invention discloses a seismic reflected wave response high-fidelity forward modeling calculation method suitable for a deep saline water layer, and the method comprises the steps: S10, building a saline water layer pore fluid rock physical model according to the development characteristics of the saline water layer, and calculating the viscosity, density, longitudinal wave velocity and bulk modulus of the saline water layer pore fluid; s20, according to the development characteristics of the salt water layer, establishing a multi-scale rock physical model of the salt water layer to obtain an equivalent stiffness matrix of the salt water layer; s30, establishing a geology-earthquake forward modeling model; s40, calculating a salt water layer reflection and transmission coefficient matrix by using a propagation matrix method; and S50, calculating the reflected wave seismic response of the salt water layer. According to the method, seismic rock physical modeling and seismic forward modeling technologies are combined, the viscoelastic characteristic and the thickness of the salt water layer are considered, the actual geological condition is better met, the cost is low, the precision is high, the deep salt water layer seismic reflected wave response can be rapidly and accurately calculated, and theoretical support is provided for evaluation and optimization of the carbon storage space.

The invention relates to the technical field of LCD (liquid crystal display) detection, and discloses a sensor-based LCD defect detection system, which comprises a frequency sweep synchronous excitation module for generating a frequency sweep excitation signal and an orthogonal reference signal; a pixel addressing driving module; the integrated multi-mode sensing assembly is used for synchronously detecting a pixel transient electric field and acoustic elastic wave response in a non-contact manner; the multi-channel synchronous data acquisition and phase-locked analysis unit is used for performing digital phase-locked demodulation on the response signal; and a master control and data analysis system. And the main control system controls frequency scanning, constructs a multi-physical field dynamic response spectrum for each pixel according to demodulation data, and finally realizes defect detection and classification by comparing and analyzing the response spectrum and a reference spectrum. According to the method, traditional single-point measurement is replaced by dynamic spectral line characterization, and multi-physical field information is fused, so that the detection sensitivity of weak defects is remarkably improved, and automatic and accurate diagnosis of defect types is realized.

The application relates to a liquid metal phased array antenna and belongs to the technical field of antennas, which solves the problem of limited electromagnetic wave response phase adjustment of the phased array antenna in the prior art. The liquid metal phased array antenna is characterized in that it comprises: a plurality of antenna units distributed in an array; the antenna unit comprises: a flexible dielectric layer and liquid metal; the flexible dielectric layer is provided with a linear microchannel, and the liquid metal is filled in the linear microchannel. The application adjusts the length of the internal liquid metal by supplying pressure in the linear microchannel cavity, thereby realizing the morphological reconstruction of the antenna unit. The reconstruction state is continuous, and the phase control coverage range is large.

The invention relates to the technical field of ocean engineering and renewable energy sources, and discloses a back wave water inlet type oscillating water column structure based on long wave reduction and energy extraction, which comprises a wave absorption main body, a support, a pile foundation and a turbine generator set with an air turbine, and further comprises an arc-shaped moving door, the two arc-shaped moving doors are connected into an interlayer of the wave absorbing body in a sliding mode, and a back water inlet matched with the two arc-shaped moving doors is formed in one side of the wave absorbing body. Water level modulation caused by the phase difference between the liquid level fluctuation of the cavity and the liquid level fluctuation outside the cavity is formed to reduce waves. According to the technical scheme, wave response optimization under different wave periods can be achieved by synchronously adjusting the size of the water inlet, the energy extraction efficiency is improved, the wave transmissivity is reduced, and the device is suitable for various layout forms of offshore and open sea areas and has the good wave adaptability and the integration characteristic of wave reduction and energy extraction.

The application discloses a high-performance Helmholtz nanoresonator responding to ultrasonic waves and a preparation method thereof. The method comprises the following steps: preparing a CeO2 mesoporous hollow skeleton by using a hydrothermal synthesis method in a one-pot method, covering a SiO2 shell layer on the surface of the CeO2 mesoporous hollow skeleton by using an in-situ polymerization method, and controlling the thickness of the SiO2 shell layer by adjusting reaction conditions to prepare the CeO2@SiO2 Helmholtz nanoresonator. The preparation process is simple, the prepared nanoresonator is not only uniform in structure, but also has high ultrasonic wave response performance, and has a wide application prospect.

The present application relates to the technical field of rock physics and reservoir geophysics, and particularly relates to a rock physics surface modeling method, system, storage medium and electronic device, the method comprising: assigning the elastic modulus of the carbonate rock along the logging axial direction to the rock matrix, adding the preset pores and / or preset fractures of the carbonate rock along the logging axial direction to the rock matrix to obtain a rock dry skeleton; adding the parameter data of the fluid to the rock dry skeleton, calculating the wave response characteristics of the carbonate rock containing the fluid, establishing a physical point model of the carbonate rock containing the fluid, unifying the physical point models corresponding to the multiple logging respectively to obtain a physical surface model of the carbonate rock containing the fluid, combining the advantages of the point and line modeling methods, realizing high-precision and unified rock physics surface modeling, and being suitable for surface modeling of complex carbonate rock reservoirs and the like.

The application provides a kind of based on super surface dual-frequency non-diffractive multi-beam antenna and design method, it is related to electromagnetic field, antenna includes unit structure, unit structure includes first layer metal patch, second layer metal patch and third layer metal patch;First layer metal patch is sensitive to high-frequency electromagnetic wave response, and third layer metal patch is sensitive to low-frequency electromagnetic wave response.Through the parameter of first and second layer patch is respectively conditioned, the array reflection phase of array unit at two operating frequencies is realized independent control, and then the non-diffractive beam array reflection phase distribution is realized according to actual needs, realizes dual-frequency non-diffractive focusing effect, according to generalized Snell law, further realizes for non-diffractive beam arbitrary angle deflection, finally the superposition of multiple single-beam array reflection phase distribution can be realized multi-beam non-diffractive.The application has the advantages of small array, wide focusing range, flexible beam direction control and simple manufacturing.

The invention discloses an FPV system design method based on forward wave performance, and belongs to the technical field of floating type photovoltaic systems, and the method comprises the following steps: S1, collecting and processing key design elements of an FPV system, S2, calculating the boundary and step length of a design variable by using a dimensionless parameter analysis normal form, S3, calculating the related data of working conditions and forward wave performance, and S4, calculating the design parameters of the FPV system. The method comprises the steps of S1, calculating a working condition name table and a wave-following property table according to the working condition name table and the wave-following property table, S2, calculating a local wave-following property map and an overall wave-following property map of a target array of the FPV system according to the content of the working condition name table and the wave-following property table, S5, obtaining a design interval of FPV system parameters through a map analysis method, S6, limiting the design interval in combination with specific conditions to obtain specific values of design elements of the FPV system, and S5, calculating the wave-following property of the target array of the FPV system according to the specific values of the design elements of the FPV system. By the adoption of the method, the response characteristics of the FPV system when the FPV system deals with the wave load are reflected along the wave, and meanwhile optimization design of key parameters of the FPV system is reversely guided.

According to the deepwater wave absorbing beach curved surface shape optimization method and device, the storage medium and the computer equipment provided by the invention, segmentation optimization is performed by combining the non-uniform distribution characteristic of wave energy, so that the method has good geometric expression ability and segmentation adjustability; the segmentation density and the configuration structure can be flexibly adjusted according to the wave characteristics and the pool scale, the problem of low efficiency caused by the fact that a traditional empirical design method depends on manual trial and error is effectively solved, meanwhile, accurate matching of the curved surface shape and the actual wave reduction requirement is ensured, the area close to the water surface has the higher segmentation density, and the wave reduction effect is improved. The adjustability of the geometric contour of the area and the wave response matching degree are enhanced, and therefore fine control over the curved surface parameters of the wave absorbing beach is achieved. Besides, by constructing a unified segmentation strategy and an optimization path, the reliability of an optimization result is improved, and the number of times of physical model tests is greatly reduced, so that the design cost is reduced, and the design period is shortened.

The application belongs to the technical field of grouting compactness detection, and specifically discloses a bridge prestressed pipe grouting compactness intelligent detection system and method. The system comprises a signal acquisition and analysis module, a defect boundary calibration module, a defect identification and analysis module, and a compactness judgment and processing module. Specifically, the sensor array arranged on the outer wall of the pipe is used to collect acoustic emission and wave response signals in real time, and identify the three-dimensional grout density distribution. The inner wall three-dimensional model is constructed in combination with the pipe design drawing, and the grout density threshold is dynamically set according to the grouting material formula and the environmental temperature, so as to calibrate the grout defect boundary. Based on the boundary, the spatial position, effective volume, geometric regularity and type of the defect are extracted, and the grouting compactness is calculated. Finally, according to whether the compactness meets the standard, a grouting warning instruction or a detection report is automatically generated. The application significantly improves the reliability of defect identification and compactness calculation under complex working conditions.

This invention relates to a dual-mode rocker-plate wave energy generation device and energy harvesting method based on a stepped moon pool. At least one moon pool is set within a square barge carrier. A rectangular step is set at the bottom of the moon pool, and a rocker-plate float is installed inside the cavity, with a rotating shaft passing through the center of the float. Slots perpendicular to the surface of the square barge carrier are respectively opened on two opposite side walls of the moon pool cavity. A piston rod is slidably connected within the slots, with one end of the piston rod rigidly connected to the end of the adjacent rotating shaft via a crank-connecting rod, and the other end connected to a hydraulic transmission power generation system. The rectangular step within the moon pool amplifies the wave response amplitude, causing the heave-roll dual-degree-of-freedom rocker-plate assembly to generate heave and roll motions. The rotating shaft converts the wave energy accumulated in the expanded moon pool into electrical energy through the hydraulic transmission power generation system. This invention achieves an organic unity of wave focusing effect, efficient energy harvesting, wide-frequency response, and structural durability, providing a reliable technical solution for the large-scale application of wave energy power generation technology.

The application discloses a lightning stroke piezoelectric wave online sensing method and device, comprising the following steps: arranging a piezoelectric sheet on the back of a composite material structure to be monitored; the front of the composite material structure to be monitored is subjected to a lightning stroke; the piezoelectric sheet converts a mechanical quantity of a lightning stroke wave response into a lightning stroke piezoelectric wave response signal, and transmits the lightning stroke piezoelectric wave response signal to an optical transmitter through a wire for short-distance transmission; the optical transmitter converts the lightning stroke piezoelectric wave response signal into a lightning stroke piezoelectric wave response optical signal, and transmits the lightning stroke piezoelectric wave response optical signal through an optical fiber for long-distance transmission; and an optical receiver receives the lightning stroke piezoelectric wave response optical signal, and converts the lightning stroke piezoelectric wave response optical signal into a lightning stroke piezoelectric wave response signal which is output to a data acquisition device. The lightning stroke piezoelectric wave online sensing method and device are adopted, the cathode of the piezoelectric sheet is short-circuited to the structure to be monitored, the resistive voltage generated in the conduction of the lightning current is avoided to cause damage of the sensor, and meanwhile, the quality of the lightning stroke piezoelectric wave response signal is improved.

The present disclosure relates to a method and system for transmitting data, a master module. The system comprises: a first channel; a master module connected to a first slave module through the first channel; and a second channel, the bandwidth of the second channel is greater than that of the first channel, and the master module is also connected to the first slave module through the second channel; wherein, in response to first data to be transmitted to the first slave module, the master module obtains the level of the first data; in response to the level of the first data not being the lowest level, the master module generates a wave request frame and sends the wave request frame to the first slave module through the first channel to request the first slave module to generate a wave response frame; after the master module receives the wave response frame through the first channel, the master module generates a first state frame and sends the first state frame to the first slave module through the first channel to inform the first slave module that it is allowed to transmit the first data to the master module through the second channel.

The invention belongs to the technical field of geophysical exploration seismic forward modeling, and discloses a method and a device for constructing and solving a viscous wave equation of an anisotropic medium, and the method comprises the steps: 1, constructing a pure acoustic wave equation in the anisotropic medium, and solving the pure acoustic wave equation of the anisotropic medium; step 2, based on a Kelvin-Voigt model, constructing a viscous acoustic wave equation in an isotropic medium; and combining the viscous acoustic wave equation in the isotropic medium with the pure acoustic wave equation in the anisotropic medium to obtain a viscous pure acoustic wave equation in the anisotropic medium. A numerical example shows that the obtained viscous pure acoustic wave equation in the anisotropic medium can effectively eliminate interference and generate high-precision P-wave response; meanwhile, the influence of the anisotropic attenuation medium on seismic wave kinematics and dynamics can be fully displayed, and an efficient and accurate wave field extrapolation tool is provided for subsequent anisotropic attenuation medium migration imaging and waveform inversion.

The invention relates to the technical field of waterway traffic control, and relates to a tunnel ship navigation traffic control method, a terminal, a medium and a program product, and the method comprises the steps: obtaining a blocking ratio coefficient of a ship relative to a current water cross section of a tunnel; the maximum safe wave climbing value allowed by the tunnel side wall is preset; establishing a limited water area ship traveling wave response model among the blockage ratio coefficient, the ship navigational speed and the wave climbing value; calculating the critical safe navigational speed of the ship sailing in the tunnel; generating a personalized speed limiting instruction for the ship based on the critical safe navigational speed, and performing graded speed control on the ship through a traffic signal system; according to the method, a hierarchical control strategy is implemented, and a smooth acceleration strategy is implemented at an inlet section, so that superposition of inlet surges and solitary waves caused by a'piston water pushing 'effect is avoided; a nonlinear deceleration strategy coupled with the residual distance is implemented at the exit section, so that ship speed attenuation is matched with wake wave energy dissipation, and destructive superposition of a wake wave and an exit reflected wave is prevented.

The application discloses a kind of suitable for deep brackish aquifer seismic reflection wave response high fidelity simulation calculation method, the method includes S10: according to brackish aquifer development characteristics, establish brackish aquifer pore fluid rock physics model, calculate the viscosity, density, longitudinal wave velocity and bulk modulus of brackish aquifer pore fluid;S20: according to brackish aquifer development characteristics, establish brackish aquifer multi-scale rock physics model, obtain brackish aquifer equivalent stiffness matrix;S30: establish geology-seismic forward modeling;S40: utilize propagation matrix method to calculate brackish aquifer reflection and transmission coefficient matrix;S50: calculate brackish aquifer reflection wave seismic response.The application combines seismic rock physics modeling and seismic forward simulation technology, considers the viscoelasticity characteristics and thickness of brackish aquifer, is more in line with actual geological conditions, low in cost, high in accuracy, can quickly and accurately calculate deep brackish aquifer seismic reflection wave response, provides theoretical support for the evaluation and optimization of carbon storage space.

The invention relates to a mineral prospecting method based on response of electromagnetic waves to minerals and a related device, and belongs to the technical field of mineral exploration, the mineral prospecting method based on response of electromagnetic waves to minerals comprises the following steps: obtaining a reflection electromagnetic wave signal after a preset emission electromagnetic wave signal is reflected by a to-be-detected area; performing spectral analysis on the reflected electromagnetic wave signal, determining a frequency distribution spectrum of the reflected electromagnetic wave signal, and filtering the frequency distribution spectrum to obtain an effective frequency band electromagnetic wave signal in the reflected electromagnetic wave signal; and calculating a power attenuation value of the effective frequency band electromagnetic wave signal and the corresponding emission electromagnetic wave signal, and obtaining the mineral resource information of the to-be-detected area based on the power attenuation value and a preset mapping relation between the power attenuation value and the mineral resource information. According to the invention, accurate detection of mineral resource information can be realized.

The invention provides a multi-feature fusion unsupervised learning collaborative composite material layering damage detection method, and relates to the technical field of nondestructive testing, and the method comprises the following steps: S1, designing a detection area and a sensor array, exciting a sensor to obtain a guided wave response signal, and collecting the guided wave response signal; s2, determining a baseline signal and performing multi-feature extraction; s3, fusing multiple features, and classifying damage paths by using a K-means unsupervised classification method; and S4, according to a classification result, performing probability imaging by using a damage path to determine a damage position. According to the method, through fusion of multiple features, damage characteristics are described from multiple dimensions of a time domain, a frequency domain and a time-frequency domain, a complementary information chain is formed, the information utilization rate is improved, the false drop rate is reduced, and the comprehensiveness of damage characterization is remarkably improved, so that damage position information is extracted, and positioning of the layered damage of the composite material by using the lamb waves is realized; and even under a relatively complex working condition, relatively high detection result reliability can be ensured.

The invention relates to the technical field of mine earthquake monitoring, and provides a coal mine earthquake generation and vibration wave response monitoring device and method.The coal mine earthquake generation and vibration wave response monitoring device comprises a case and further comprises a high-precision micro-earthquake monitor, a supporting frame, a supporting plate, a signal detection mechanism and a lifting mechanism; a high-precision micro-seismic monitor is installed on the case, a signal acquisition module, a data recording module, a communication module and a processor are arranged in the high-precision micro-seismic monitor, the processor is electrically connected with the signal acquisition module, the data recording module and the communication module, and the supporting frame is fixedly arranged on the case. The supporting plate is arranged in the supporting frame in a sliding mode, the signal detection mechanism is arranged on the supporting plate and used for detecting seismic waves in a coal mine, the lifting mechanism is arranged between the supporting frame and the supporting plate, and through the technical scheme, the problem that in the prior art, the installation stability of a detection probe is low is solved.

This invention discloses a method for detecting the quality of power pole splices based on the back-transmission ratio of elastic wave signals, belonging to the technical field of power facility safety evaluation. The method includes: applying vibration to the pole and acquiring the elastic wave response signal; extracting the reflection amplitude A at the splice. b And the amplitude of the reflection from the top of the pole A t This invention introduces a distance attenuation coefficient κ to construct a back-transmission ratio ζ that eliminates the influence of excitation force. Based on the elastic wave multilayer medium propagation model, a nonlinear mapping relationship between the impedance ratio η of the joint and the rod and ζ is established, and η is obtained by solving the problem. The tightness of the joint is evaluated based on the value of η; the closer η is to 1, the tighter the connection. This invention eliminates the influence of impact force by introducing a back-transmission ratio ζ and compensates for the difference in propagation distance by using an attenuation coefficient κ, thus achieving quantitative and robust detection of the joint quality and overcoming the shortcomings of traditional methods that rely on the absolute amplitude of the signal and are easily affected by medium attenuation.

The invention relates to the technical field of crack defect imaging, and provides a columnar structure crack damage space positioning and imaging method and system.The method comprises the steps that a columnar structure to be detected is detected, and a guided wave response signal is obtained; based on a direct wave part in the guided wave response signal, calculating a waveform difference index and an amplitude difference index which are used for representing the damage degree of the sensing path, and fusing the waveform difference index and the amplitude difference index to form a bidirectional difference fusion damage index; a cylindrical coordinate system space modeling and path propagation distance reconstruction method is adopted, space mapping processing is conducted on the sensing paths and the corresponding bidirectional difference fusion damage indexes, a three-dimensional damage probability distribution diagram of the cylindrical structure surface is obtained, and space positioning and preliminary imaging of cracks are achieved; and screening a crack direction path and correcting the bidirectional difference fusion damage index to obtain a complete crack imaging picture. Based on the guided wave and the improved RAPID algorithm, accurate imaging and positioning of the crack damage of the columnar concrete structure can be realized.