19 results about "Head wave" patented technology

The invention relates to the technical field of disaster prevention and control engineering, discloses a glacial lake surge channel type energy dissipation and wave resistance tough structure and a layout method, and aims to solve the technical problems that the peak clipping capacity of head wave surge is insufficient, the structural stability depends on a rigid foundation, the energy clipping direction depends strongly and the like under the glacial lake working condition in an existing surge energy dissipation technology. The ice lake surge channel type energy dissipation and wave resistance tough structure comprises floating type wave dissipation elements, transverse array connecting cables and lateral restraining assemblies, the multiple floating type wave dissipation elements are connected in series through the transverse array connecting cables to form a transverse array, and the lateral restraining assemblies are arranged at the two ends of the transverse array connecting cables correspondingly. The floating type wave dissipation element is sequentially provided with an annular water-permeable flow guide energy dissipation crown, a water absorption-release elastic energy absorption array and a flexible air bag floating supporting assembly from top to bottom in the vertical direction, and a double-stone anchoring system is connected to the lower portion of the floating type wave dissipation element and comprises overhanging pumice stone, bottom anchoring stone and a vertical stroke limiting ring.

The invention discloses a tidal bore tide head line detection and segmentation method. According to the method, aiming at the problems of low tide line detection precision, weak generalization ability and large calculation overhead of an existing method, an instance segmentation method is innovatively used for detection. The method specifically comprises the following steps: introducing a C3k2ODConv module into a neck network, constructing a four-dimensional collaborative attention mechanism by using full-dimensional dynamic convolution, and enhancing the extraction and expression ability of a model to multi-scale features; a C2PSA module in a backbone network is replaced by a C2PSADA T module, and a DA attention mechanism and a feedforward network structure are introduced, so that the sensing and positioning capability of a key area in an image is improved; and meanwhile, a backbone network is replaced by a MobileNetV4 architecture, and a Fused-IB module and a UIB module are combined, so that the balance of model lightweight and deep semantic modeling is realized. Experiments prove that under the IoU threshold value of 50-95%, the average mask precision of the method reaches 68.2%, the model parameter quantity is 6.513 M, the reasoning speed is 25.2 ms / frame, the method is remarkably superior to an original model, detection precision and deployment efficiency are both considered, and the method is suitable for intelligent tidal bore monitoring in the complex environment.

The invention discloses a concrete filled steel tube interface void detection method based on head and tail wave conjoint analysis. A plurality of piezoelectric sensors are uniformly arranged on the inner wall of a steel pipe, modulation pulse or sine wave signals are adopted to cyclically excite the piezoelectric sensors, and response signals of the opposite side and the corresponding adjacent sensors are collected. Under the assumption that both the steel pipe and the concrete are uniform media, the characteristic change of the head wave signal mainly reflects the interface state on the propagation path, and can be used for identifying the interface void of the area where the excitation or receiving sensor is located; as the tail wave signal contains multiple reflection and scattering components, the symmetrical path contrastive analysis is carried out on the tail wave signal, and the medium change of an indirect area between the sensors can be effectively sensed, so that the void condition of a corresponding position is judged. According to the method, quantitative recognition of the head wave on the path defect and high-sensitivity sensing of the tail wave on the change of the adjacent region are combined, so that a completely-covered void detection system is constructed, and the technical problem that global monitoring is difficult to realize by a traditional method is solved.

The invention discloses a concrete micro pile body integrity detection method based on an ultrasonic technology, and relates to the technical field of defect detection.The method comprises the steps that original waveform data of multiple depths in a concrete micro pile are obtained; according to smooth continuity of reflection extreme points of different depths in the original waveform data, a reflection extreme chain is constructed, and the reflection extreme points are waveform maximum values in the original waveform data; determining a suspected head wave extreme point in the reflection extreme points of different depths based on the matching optimization degree and the matching mutability of different reflection extreme points on the reflection extreme chain; based on the matching optimization degree of the suspected head wave extreme points of different depths, defect existence probabilities of different depths are calculated; and when the defect existence probability meets the preset condition, the depth position of the defect of the concrete micro pile is determined. The technical effect of improving the accuracy of defect identification is achieved.

The invention discloses an optimal phase matching wave source estimation method based on head wave statistics and norm constraint, and belongs to the field of signal processing. On the basis of statistical method wave source estimation, a Hilbert orthogonal component and a constant phase rotation mechanism are introduced to realize RMS energy retention type all-phase scanning wave source extraction, and the method specifically comprises the following steps: carrying out dynamic correction, first arrival alignment and interception on a fluctuation signal observation data set to obtain an initial time domain wave source under a minimum phase assumption; generating an adjoint component through Hilbert transformation, carrying out phase rotation at a step length of 1 degree, carrying out L2 norm energy maintenance after each rotation, and constructing a candidate wave source library with consistent energy; and keeping the amplitude of each candidate wave source consistent with the original wave source, then carrying out convolution with the measured reflection coefficient to generate a synthetic record, and carrying out cross-correlation analysis on the synthetic record and the actually measured signal record to determine the optimal phase and wave source. The method has the obvious advantages of keeping lower inversion residual error, better fitting of profile waveform and measurement data, higher inversion resolution and the like.

The invention relates to the technical field of ocean engineering protection, in particular to an embedded seawall wave-resistant device which comprises at least one energy dissipation unit and a fixing structure, the energy dissipation unit is arranged on the head wave side of a seawall, the energy dissipation unit is constructed to be of an annular structure with a notch in the radial face and is provided with an opening in the axial direction, and the notch forms the head wave face; the fixing structure is fixed in the embankment; through the geometrical characteristics of the energy dissipation units, wave energy is converted into internal mutually-counteracted fluid motion, so that the purpose of actively and efficiently dissipating waves is achieved, and direct scouring of waves to the embankment body is relieved. According to the device, on-site construction installation and subsequent maintenance are facilitated, the arrangement scale and mode of the energy dissipation unit can be flexibly adjusted according to the protection requirement of a specific shoreline, and good adaptability and practicability are shown.

The invention relates to a single-sensor two-dimensional impact positioning method and system of an integrated metasurface. The method comprises the following steps: acquiring a pre-prepared metasurface containing inverted T-shaped unit cells, forming an integrated sensor by utilizing the metasurface and a piezoelectric sensor, fixing the integrated sensor on a composite material plate, collecting a Lamb wave head wave signal generated by impacting a preset monitoring area, and labeling a corresponding two-dimensional impact position label; performing continuous wavelet transform on the Lamb wave head wave signal, extracting a wavelet coefficient of a preset low-frequency band, separating ridge slope features representing an X-direction impact position and multi-peak region range features representing a Y-direction impact position from the wavelet coefficient, and constructing a two-dimensional data matrix in combination with a two-dimensional impact position label to obtain a grayscale image sample; and training a pre-constructed convolutional neural network by using the normalized grayscale image sample, and realizing two-dimensional impact positioning by using the trained convolutional neural network. By adopting the method, the weight and complexity of the system can be obviously reduced, and the positioning robustness and accuracy can be improved at the same time.

The invention provides a well cementation quality detection method, which is used for detecting the cementation degree of a current casing and a rock stratum to generate a detection result, and comprises the following steps: acquiring a group of sound wave signals transmitted through the current casing and the rock stratum; converting the group of sound wave signals into corresponding envelope waves; wherein the envelope wave refers to amplitude detection of a group of sound wave signals; extracting an envelope wave peak value from the envelope wave, evaluating the cementing degree of the current casing and the rock stratum based on the envelope wave peak value, and generating a detection result of the cementing degree of the current casing and the rock stratum. According to the method, one group of sound wave signals is used, comprehensive evaluation is carried out through one group of sound wave signals in the face of the high-speed rock stratum, detection is not carried out through sound wave head waves, the influence degree of the high-speed rock stratum on sound waves can be effectively reduced, and the accuracy of a detection result is improved.

The invention relates to a single-end fault positioning method suitable for a multi-branch power distribution network, which belongs to the technical field of fault positioning of a power distribution line, and comprises the following steps of: 1, calibrating a fault reflection head wave arrival time tf1 through a reflection wave arrival time sequence after injecting a signal; step 2, performing time-frequency transformation on the pure reflected wave signal by adopting WVD to obtain a time-energy curve of the main frequency f0 of the head wave reflected by the fault point, determining the central position and the interval range of a time-frequency window Wi, and constructing an energy distribution vector of each reflected wave in sequence by sliding the time-frequency area Wi; 3, introducing cosine similarity to carry out quantitative evaluation on similarity between energy distribution vectors of the fault reflection head wave and other reflection waves, and screening fault characteristic reflection waves through a similarity threshold value delta; 4, calculating the relative position of a fault point through the propagation time difference, and judging a fault branch in combination with the topology of the power distribution network.

The application discloses a kind of bone tissue component and structural mechanical property evaluation method based on photoacoustic guided wave, comprising the following steps:S1, bone is processed into plate type standard part;Step S2, different wavelength laser is used to excite guided wave in bone, and the signal of multiple wavelength photoacoustic guided wave is collected based on axial propagation method;Step S3, signal processing technique is used to extract photoacoustic guided wave signal characteristic parameter;Step S4, the head wave amplitude ratio or power spectral density slope of each mode of multiple wavelength photoacoustic guided wave is drawn to draw photoacoustic guided wave parameter spectrum;Step S5, the optical and structural mechanical property and tissue component of bone standard part are measured;Step S6, S1-S5 is repeated to obtain the characteristic parameters of photoacoustic guided wave, bone property data of different bone standard parts, and the mapping information base of photoacoustic guided wave parameters and bone tissue component, structural mechanical property is established;Step S7, the bone to be measured is processed into standard part, and the characteristic parameters of multiple wavelength photoacoustic guided wave signal are tested;It is brought into the information base in S6, and the acoustic evaluation of bone tissue component and structural mechanical property to be measured is realized.

The invention discloses an unmanned vehicle autonomous navigation decision-making method based on ship-borne wave measurement, and relates to the technical field of ships, and the method comprises the steps: carrying out the online estimation of the sea condition information of a vehicle during the actual navigation and operation according to the real-time monitored data of the motion response, the navigational speed, the navigational direction and the wave direction of the vehicle; according to the method, a comprehensive dynamic overturning risk coefficient is calculated based on current sea condition information and real-time wave direction data, a hierarchical progressive aircraft control instruction is given according to the grade of the dynamic overturning risk coefficient, and the overturning risk of the aircraft caused by side wave navigation is avoided; on the basis of current sea condition information and real-time wave direction data, in combination with perception information of an obstacle, the route is optimized by taking balance of safe obstacle avoidance and cost as targets, the cost comprehensively considers the obstacle, the sea condition and aircraft energy consumption, energy optimization decision is realized on the basis of ensuring safe navigation, and the method is simple and convenient to implement. And the situations such as over-high energy consumption caused by whole-course top waves or overturning caused by side wave navigation under the condition of autonomous obstacle avoidance are avoided.

The utility model relates to the technical field of electrical connection assemblies for automobiles, and provides an ultra-light electromagnetic compatibility connector which is composed of a terminal, a male head assembly and a female head assembly which are connected in sequence, the terminal is composed of a terminal shell and two contact parts arranged in the terminal shell side by side, a plurality of first slots are formed in the inner wall of the terminal shell, and the male head assembly and the female head assembly are inserted into the first slots. The male head assembly comprises a male head wave absorbing part, a male head shielding part and a male head insulating part which are assembled and connected in sequence, and the female head assembly comprises a female head wave absorbing part, a female head shielding part and a female head insulating part which are assembled and connected in sequence. According to the connector, the terminals, the male head assembly and the female head assembly are sequentially stacked and integrated, electromagnetic interference can be effectively absorbed and shielded, the connector has excellent electromagnetic compatibility, light materials are reasonably selected to manufacture all the components, on the premise that the performance is guaranteed, the light-weight design of the connector and close fit between all the components are achieved, and the connector is convenient to assemble and disassemble. The connection stability and reliability of the connector are improved, and the connector is suitable for various complex working environments.

The invention relates to the technical field of ultrasonic detection, in particular to a method and equipment for detecting peeling of a gold-plated layer of a connector flange plate. The method comprises the following steps: determining a peeling severity index of a gold-plated layer at each monitoring point according to similar characteristics among different wave crests in an ultrasonic echo signal of each monitoring point on a to-be-monitored flange plate and dominant frequency amplitude prominent characteristics; analyzing wave crest distortion conditions of a head wave signal and a tail wave signal in the ultrasonic echo signal in combination with a spalling severity index, and determining a spalling factor of each monitoring point; dividing the flange plate to be monitored into a plurality of areas through the spalling factors; according to the area proportions of the different areas and the spalling factors of the monitoring points in the areas, obtaining an area spalling characterization value of each area; and judging the defect grade of the to-be-monitored flange plate by integrating the area peeling characterization values of all the areas. The accuracy of a flange plate peeling defect detection result is improved.

The embodiment of the invention provides a rock mass wave velocity test head wave automatic identification method and system.The method comprises the steps that after sound waves are excited at rock mass test points, two receivers collect original sound wave signals of two receiving points; carrying out modal decomposition on the original sound wave signal by utilizing an optimization algorithm to adaptively determine a signal decomposition parameter, and screening out an effective component from decomposed components based on an information entropy index to reconstruct and form a denoised sound wave signal; based on a reference waveform extracted from the de-noised signal of the first receiver, automatically identifying a head wave in the de-noised signal of the second receiver through a waveform similarity matching principle, and calculating a head wave arrival time difference of two receiving points; and calculating and outputting a rock mass wave velocity value based on the head wave arrival time difference and a known receiver spacing.

The invention particularly relates to an aircraft docking optimal trajectory planning method based on a high-fidelity coupling model, and belongs to the field of flight control and trajectory planning. In view of the problems of target offset and insufficient docking precision caused by insufficient consideration of wake flow, head wave and other composite disturbances in existing trajectory planning, a coupling simulation environment fusing aircraft dynamics, a wake flow field of an aircraft as a target, a head wave effect and dynamics of a dynamic system to be docked is constructed; establishing a multi-objective optimization function with terminal precision, process stability, control energy consumption and target swing suppression as cores, and forming a trajectory optimization problem in combination with aircraft dynamics, state and control constraints and terminal docking precision constraints; efficient online solving is performed through a direct point collocation method and sequential quadratic programming, and an optimal docking track capable of actively compensating disturbance and keeping the track stable is generated. According to the method, the robustness and docking success rate of the system under strong disturbance are effectively improved, and trajectory planning support is provided for accurate docking tasks.

The present application belongs to the technical field of aerial refueling training simulation, and discloses a full-physical-field hose drogue dynamic docking method for aerial refueling simulation. The method comprises the following steps: S1, obtaining the initial three-dimensional positions of each segment, independently calculating the gravity droop effect, whipping effect, head wave repulsion effect and random oscillation effect for each released segment, and superimposing each effect to obtain the updated three-dimensional positions of each segment; S2, performing forward iteration adjustment and reverse iteration adjustment on the updated three-dimensional positions of each segment to obtain the adjusted three-dimensional positions of each segment; S3, in response to the adjusted three-dimensional positions of each segment being in a non-docking state, entering 3D rendering with the adjusted three-dimensional positions of each segment and returning to S1 to enter the next time step; and S4, in response to the adjusted three-dimensional positions of each segment being in a docking state, calculating the target release length, feeding back the slack factor and droop coefficient to S1, and entering 3D rendering with the adjusted three-dimensional positions of each segment and returning to S1 to enter the next time step.

The invention belongs to the technical field of aircraft air refueling design, and discloses an air refueling head wave modeling method based on a neural network, and the method comprises the steps: obtaining the coordinates of a refueling machine taper sleeve relative to the tip of a fuel receiver taper pipe, and obtaining the coordinates of a refueling machine refueling pod relative to the tip of the fuel receiver taper pipe; adding refueling docking sort marks to the coordinates to make a data set, sorting the data set according to refueling docking sorts, calculating to obtain a closed external force of the taper sleeve under the refueling machine coordinate system, filtering data in the data set of each refueling docking sort, and subtracting a rope pulling force and a damping force borne by the taper sleeve to obtain a head wave field force borne by the taper sleeve; the coordinates of the oiling machine taper sleeve relative to the tip end of the oil receiver taper pipe serve as input, the head wave field force borne by the taper sleeve serves as output, the input is input into the deep neural network for training, and the deep neural network obtained through training is output to draw a head wave field cloud picture. According to the method, the stress condition of the taper sleeve in the oil receiving head wave field can be obtained, and then air refueling head wave modeling is completed.

The invention relates to a temperature and pressure reduction system thermal lag first peak decoupling control method and system, and belongs to the technical field of thermotechnical automation, the method realizes decoupling through the following steps: determining the start and end time of a first wave window, and establishing a safety envelope according to an allowable temperature change rate, a pressure change rate, a minimum nozzle pressure difference and a material thermal shock limit; a pressure forming main track and a temperature following auxiliary track are constructed, and peak shifting cooperation of pressure forming first and temperature following second is achieved through three-section design of a starting gentle slope, linear climbing and converging; a gating signal is generated based on nozzle differential pressure continuous monitoring and valve side slope convergence, and it is ensured that the water side participates only when atomization is effective; a limited micro-correction increment is calculated, envelope projection is implemented, and the action is maintained within a safety boundary; and when the temperature and pressure change rate reaches a steady-state threshold, smoothly transferring to conventional control. The method obviously reduces the head wave temperature overshoot and pressure disturbance, improves the equipment reliability, and is suitable for high-dynamic scenes such as boiler start-stop and bypass.