72 results about "Wave coupling" patented technology

The application discloses an analysis method for key local vibration of fluid-solid coupling bridges based on a substructure method, and relates to the technical field of bridge vibration analysis, and comprises the following steps: dividing a response key area in a bridge structure into substructures, performing static condensation, and obtaining a condensed substructure model; establishing a whole bridge-wave coupling model, and adopting a dynamic explicit solving strategy based on a coupling Euler-Lagrange method; independently solving the substructures by using a dynamic implicit method; coupling the substructures to the whole model by an interface coordination condition, and jointly calculating the whole explicit model and the local implicit model. The analysis method adopts an explicit method to process a strong nonlinear fluid-solid coupling process at a whole level, and establishes a fine substructure model through Guyan static condensation at a local area, so that the analysis precision is effectively improved.

The present invention relates to a test probe (10) for contactless measuring of the electromagnetic properties of a radio unit (20), in particular an antenna unit, the test probe (10) comprising a waveguide (1) for transmitting electromagnetic waves, a filler element (2) made of dielectric material and disposed in the waveguide (1), a lens element (3) for coupling electromagnetic waves into the waveguide (1), the lens element (3) being made of dielectric material and being disposed at one end of the waveguide (1), and a contact portion (4) for coupling out a measurement signal, the contact portion (4) being disposed at an end of the waveguide (1) opposite the lens element (3).

This application provides a self-injection-locked narrow-linewidth laser with a quasi-continuous locking region, comprising: a semiconductor laser source for generating an initial linewidth laser and outputting it via end-face coupling; a photonic integrated microcavity chip including a bus waveguide and a microring resonator coupled to it via an evanescent wave, for receiving the initial linewidth laser and providing feedback light to the semiconductor laser through Rayleigh backscattering of the microring resonator to excite a self-injection-locking effect; the microring resonator is a compact folded waveguide microcavity with an ultra-low free spectral range, the free spectral range of which is less than a preset threshold, so that when the driving current of the semiconductor laser is changed for wavelength tuning, the self-injection-locking regions of adjacent resonant modes in the cavity physically overlap or are closely spliced ​​in the current tuning parameter space, so that the semiconductor laser can continuously transition between adjacent modes without experiencing permanent unlocking during continuous current tuning, forming a quasi-continuous locking region.

The application provides a visual micro-nano optical waveguide refractive index sensing system, and a hardware part comprises a nano fiber taper coupled fluorescent doped polymer microwire; the nano fiber taper coupled fluorescent doped polymer microwire is coupled by a nano fiber taper and a fluorescent doped polymer microwaveguide; the nano fiber taper is obtained by adopting a flame tapering method from a standard single-mode optical fiber; the fluorescent doped polymer microwaveguide is directly prepared by wire drawing from a mixed solution doped with a fluorescent dye; the nano fiber taper and the fluorescent doped polymer microwaveguide placed in a channel of an optical substrate jointly form an evanescent wave coupling structure; a signal analysis part enhances, edge extracts, smoothes and peak extracts a fluorescent image of the microwire through an image analysis algorithm, obtains an oscillation period of a fluorescent light path in the microwire under a current environment, establishes a response relationship between the light path period and the environmental refractive index, realizes direct real-time obtaining of environmental change conditions from optical images of a sensing unit shot by a camera, and thus obtains the change of the refractive index.

This invention relates to a method for predicting ship maneuvering motions under high sea states, comprising the following steps: establishing a three-dimensional numerical model of ship-wave coupling under high sea states based on computational fluid dynamics; installing sensors on the ship to collect real-time motion data of the ship under high sea states, and preprocessing the collected data; extracting feature parameters related to the ship's six degrees of freedom motion based on the preprocessed data; using the feature parameters as input, constructing a ship maneuvering motion prediction model using a neural network model, the output of which is the prediction result of the ship's six degrees of freedom motion over a future period; training and validating the prediction model using historical data; inputting the real-time collected data into the trained prediction model to perform real-time prediction of the ship's six degrees of freedom motion; generating ship maneuvering suggestions based on the prediction results; and providing real-time feedback and correction to the model based on the comparison between actual operating data and the prediction results. This invention has the effects of improving prediction accuracy, ensuring ship safety, and improving prediction precision.

The present invention relates to a test probe (10) for contactless measurement of the electromagnetic properties of a radio unit (20), in particular an antenna unit, comprising a waveguide (1) for transmitting electromagnetic waves, a filling element (2) made of dielectric material arranged in the waveguide, a lens element (3) made of dielectric material arranged at the end of the waveguide (1) for coupling electromagnetic waves into the waveguide (1), and a contact section (4) arranged at an end of the waveguide opposite the lens element (3) for coupling out a measurement signal.

The invention discloses a high-isolation Ka-band millimeter wave coupler device and a calibration method thereof, and belongs to the technical field of coupler devices, and the high-isolation Ka-band millimeter wave coupler device comprises a coupler housing, an input pipeline, an output pipeline, a first coupling port and a second coupling port. The input pipeline and the output pipeline are respectively arranged at two ends of the coupler shell and are communicated with the coupler shell; the first coupling port and the second coupling port are arranged at the bottom end of the coupler shell and are communicated with the coupler shell; and a high-isolation switch and a digital front-end leakage elimination system which are in communication connection are arranged in the input pipeline. According to the invention, the high-isolation switch is arranged, the parasitic effect of the NMOS transistor is matched to a corresponding transmission network, and a high-Q-value inductance matching network design is adopted, so that high isolation is obtained under the condition that insertion loss is accepted, the isolation of the device at the Ka wave band reaches 33-51dB, and the requirement of high-efficiency transmission of the device at the Ka wave band is met.

The invention discloses a line sag measurement method and device based on traveling wave and temperature frequency wave velocity coupling, a medium and a product, and relates to the technical field of power transmission lines, and the method comprises the steps: calculating a modular domain wave velocity according to a traveling wave current signal in combination with a temperature frequency wave velocity coupling change function; based on the mode domain wave velocity, integration is carried out in combination with geometric characteristics of an oblique parabola, and a conductor oblique projectile traveling wave coupling coefficient is obtained; and establishing and deriving a sag expression of any point of the overhead conductor, and measuring to obtain the maximum sag of the overhead conductor in combination with the coupling coefficient. The invention provides a line sag measurement method and device based on traveling wave and temperature frequency wave velocity coupling, a medium and a product, the maximum sag position is locked through sag expression derivation, and calculation is completed in combination with the span, so that the maximum sag is obtained. The method can solve the problem of inaccurate sag calculation caused by the fact that an existing overhead conductor maximum sag calculation method does not consider the coupling influence of the temperature and the frequency on the traveling wave mode domain wave velocity and does not fully combine the geometrical characteristics of a conductor oblique parabola.

This invention discloses an electromagnetic coil winding detection system and method, belonging to the field of electromagnetic coil winding technology. It solves the problem in segmented electromagnetic coil windings of high-voltage high-frequency transformers where distributed parameter resonance and high-frequency harmonic coupling generate dynamic interlayer overvoltages, continuously inducing partial discharges, ultimately leading to winding breakdown and short circuits, and the cause of failure is difficult to trace. The system includes a data acquisition module, a data preprocessing module, a resonance feature extraction module, a parameter calculation module, a risk index calculation module, a product-level judgment module, and a batch statistical process control module. This invention collects impedance data of the electromagnetic coil at multiple frequency points and preprocesses it to extract resonance feature parameters. It then calculates the resonance amplification factor and harmonic excitation intensity by combining operating parameters, and further integrates the quality factor and frequency matching degree to generate a comprehensive risk index. Based on this index, the coil is graded, and batch data is statistically controlled to issue process warnings.

The invention discloses an analysis method for key local vibration of a fluid-structure interaction bridge based on a substructure method, and relates to the technical field of bridge vibration analysis, and the method comprises the following steps: dividing a response key region in a bridge structure into substructures, and carrying out static polycondensation to obtain a polycondensed substructure model; an integral bridge-wave coupling model is established, and a dynamic explicit solving strategy based on a coupling Euler-Lagrange method is adopted; independently solving the substructures by adopting a dynamic implicit method; and coupling the substructures into the overall model through an interface coordination condition, and carrying out joint calculation of the overall explicit model and the local implicit model. According to the analysis method, an explicit method is adopted to process the strong nonlinear fluid-solid coupling process on the overall level, a fine substructure model is established in a local area through Guyan static polycondensation, and the analysis precision is effectively improved.

A system including a mode coupler has at least one waveguide section connected between a mode coupler input and a mode coupler output. The waveguide section supports a set of guided coupler modes and a set of cutoff coupler modes, and has a transverse refractive index profile and a longitudinal refractive index profile. The transverse refractive index profile is adjusted by free-form optimization to yield a set of desired spacings between a set of propagation constants of the sets of coupler modes such that the longitudinal refractive index profile induces desired couplings between the guided coupler modes, while inhibiting undesired couplings between the guided coupler modes and the cutoff coupler modes, and undesired couplings between the guided coupler modes.

A method for wind-ship fluid-structure interaction (FSI) in a digital twin environment is proposed. This method establishes a wind-ship coupling force and moment calculation model within the constructed digital twin environment. Based on the ship's attitude attributes, the wind force and moment are calculated, and dynamic formulas are further applied to simulate changes in the ship's velocity and angular velocity, thus achieving FSI. This invention fully considers the spatiotemporal changes in the environment and the impact of changes in ship attitude. The surface of the ship model is decomposed into triangular facets for calculation, ensuring the realism of the simulation results. It is applicable to any type of offshore floating body, such as buoys, offshore drilling platforms, or offshore wind turbines, where wind and wave coupling is significant.

The invention discloses a floating type fan integrated coupling simulation method and system under the typhoon sea condition. The method comprises the steps that a Holland theoretical model wind field and an ECMWF sea surface wind field are adopted to be overlapped to construct a mixed wind field; a typhoon wave model is established by taking the mixed wind field as an input wind field of the SWAN model and combining actual measurement topographic data of the global topographic data set, so that typhoon wave spectrums in different time periods of the typhoon landing process are obtained; according to the typhoon sea wave spectrum, generating a typhoon sea wave time sequence by utilizing irregular wave linear theory superposition; simulating a three-dimensional time-domain turbulent wind field according to the maximum wind speeds of different time periods in the typhoon landing process; and inputting the turbulent wind field, the typhoon sea wave time sequence and the hydrodynamic coefficient into OpenFAST software, setting a simulation working condition to carry out wind and wave coupling integrated simulation, and obtaining structural response and motion response time history data. The method has the advantages of improving the calculation precision and efficiency of the floating type wind power load and the like.

This invention belongs to the field of multi-beam antenna arrays and discloses a filtered multi-beam array and method based on a four-channel filter jumper. By integrating a microstrip-to-substrate integrated waveguide structure, a filter Butler matrix containing a four-channel filter jumper, and an antenna array on a first metal layer, a filtered multi-beam array based on a multi-layer planar structure is constructed. The four-channel filter jumper utilizes multiple resonant cavities and coupling structures, and by precisely controlling the coupling phase between the resonant cavities, a preset phase shift is directly introduced while achieving the filtering response, thus integrating filtering and phase-shifting functions into a single device. This design avoids the complex structure of filter couplers and the additional losses of filter phase shifters in traditional integrated schemes, significantly simplifying the device architecture, reducing transmission loss, improving system integration and beamforming accuracy, and effectively meeting the urgent needs of 5G and future 6G communication systems for high performance, low loss, and high integration.

The application relates to a ship route planning method considering ship-wave coupling constraints, which comprises the following steps: S1. constructing a ship-wave coupling data model, collecting ship basic parameters, navigation parameters and wave parameters, and training and evaluating the model after preprocessing by using a CNN and RNN hybrid architecture; S2. collecting and fusing multi-source real-time marine environment data; S3. determining and dynamically adjusting ship-wave coupling constraint conditions and safety thresholds based on the ship-wave coupling data model and real-time marine environment data; S4. constructing a multi-objective optimization function based on the ship-wave coupling constraint conditions, and performing route planning by using a genetic algorithm; and S5. real-time monitoring of ship navigation state and marine environment data, and re-planning of the route when the safety threshold is exceeded, to form a dynamic closed-loop adjustment. The application has the effects of improving navigation safety, optimizing navigation efficiency and economy, and real-time dynamic self-adaptation.

The application belongs to the technical field of ocean engineering, and proposes a method for establishing a fluid-solid coupling wave tank under the combined action of wind and wave, which comprises the following steps: building a fluid-solid coupling environment, pre-processing the fluid domain and making fluid-solid coupling settings, pre-processing the solid domain and making fluid-solid coupling settings, selecting a fluid-solid coupling scheme, performing fluid-solid coupling calculation and analyzing the calculation results; compared with the prior art, the application realizes flexible construction and efficient solution of the wind-wave coupling environment; the modular architecture not only ensures the calculation stability, but also facilitates the secondary development of key links, is easy to deploy and has strong expandability, and significantly reduces the difficulty of engineering application.

The invention discloses a floating type wind power anchoring foundation scouring experiment device based on tide-wave coupling. The floating type wind power anchoring foundation scouring experiment device comprises a water tank, a wave-tide coupling simulation system, a variable anchoring foundation model and a data collecting and monitoring system. A replaceable seabed area is arranged in the water tank; the wave-tide coupling simulation system is provided with a wave making device and a tide generating device, and a composite hydrodynamic field of periodic tide water flow and multidirectional waves is generated through cooperative control; the anchoring foundation model is internally provided with a strain sensing unit and is provided with a modular anti-scour structure; the data acquisition and monitoring system synchronously acquires flow field distribution, scouring morphology and pile foundation dynamic response data through acoustics, optics and optical fiber sensing technologies. Tide-wave dynamic coupling simulation and multi-dimensional monitoring are combined, the pile foundation scouring process under the complex marine environment is reproduced, the defect that a traditional device is difficult to simulate multi-directional hydrodynamic interaction and fine monitoring is overcome, and experimental support is provided for optimization and safety evaluation of an offshore wind power anchoring structure.

Waveguides are fabricated within a photonic wafer-scale interposer (PWSI). The waveguides include a first waveguide and a second waveguide. The first waveguide and the second waveguide are within a physical spacing within the PWSI which enables evanescent coupling for at least a parallel distance. A sub-wavelength barrier is inserted between the first waveguide and the second waveguide. The sub-wavelength barrier is disposed between the first waveguide and the second waveguide for at least the parallel distance. A first modulated light beam is emitted through the first waveguide by a first optical transmitter, and a second modulated light beam is emitted through the second waveguide by a second optical transmitter. The optical transmitters can comprise optical modulators. The sub-wavelength barrier reduces or eliminates the evanescent coupling between the first modulated light beam and the second modulated light beam over the parallel distance.

The invention relates to the technical field of hydroelectric energy system transition process and control, in particular to a cooperative control method for a pumped storage-wind power combined operation system, and the method comprises the steps: obtaining a system multi-frequency dynamic characteristic analysis result which comprises the dynamic response of a low-frequency mass wave, an intermediate-frequency water hammer wave and a high-frequency electric wave and the coupling relation between a subsystem and a wavelet; in combination with a cooperative control theory, selecting the rotating speed and the guide vane opening of the pump turbine as key state variables, determining a macro-variable and deducing a control equation; the strategy is adopted to pertinently control the wavelets to preferentially control the intermediate-frequency water hammer waves, and system cooperative accurate control is achieved by regulating and controlling key state variables such as the water level of a surge chamber and the rotating speed of a unit. According to the method, multi-source coupling disturbance can be effectively inhibited, the stability and the adjusting performance of the system are improved, and the method is adaptive to various pumped storage-wind power combined operation scenes and is high in universality.

The present application relates to the technical field of acoustic metrology, and more particularly to a standard phase generation and calibration device based on a pressure field coupling cavity. The present application comprises two end surfaces of an equal-phase plane wave coupling cavity, which are respectively sealed and connected with a receiving microphone and a transmitting microphone. In the equal-phase plane wave coupling cavity, the phase of the sound pressure signal is equal everywhere. A reciprocity phase calibrator is connected with the receiving microphone and the transmitting microphone, and collects voltage, current and phase information of the equal-phase plane wave coupling cavity. A multi-channel sound analyzer is connected with the reciprocity phase calibrator, and is used to measure the phase difference between the transmitting channel and the receiving channel. An output end of a signal source is connected with an input end of the reciprocity phase calibrator. Measuring and control software is connected with the reciprocity phase calibrator and the multi-channel sound analyzer, respectively. The present application proposes a reciprocity method for calibrating the sensitivity and absolute phase, so as to realize the standard phase generation and calibration based on the pressure field coupling cavity.

The invention discloses a miniaturized broadband 180-degree filtering coupler based on a micro coaxial transmission line. Comprising a micro-coaxial outer conductor base, a first micro-coaxial open-circuit coupling line, a second micro-coaxial open-circuit coupling line, a third micro-coaxial open-circuit coupling line, a micro-coaxial short-circuit coupling line, a first micro-coaxial filtering branch knot, a second micro-coaxial filtering branch knot, a straight-through port, a coupling port, an input port and an isolation port. The first micro coaxial open-circuit coupling line, the second micro coaxial open-circuit coupling line, the third micro coaxial open-circuit coupling line and the micro coaxial short-circuit coupling line form a 180-degree broadband coupler effect, and the filter and the 180-degree coupler are fused to replace a cascade connection mode of two independent devices in a traditional design, so that the plane size of the whole system is remarkably reduced; the novel coupler is constructed by adopting the micro coaxial coupling lines, has the advantages of miniaturization, wide bandwidth and the like, and solves the problems of narrow bandwidth, single function, large size and the like of a coupler in the prior art.

This invention relates to a high-frequency plasma light source (1), wherein, in the operating state, a quasi-capacitively coupled plasma is formed by at least two plasma anchors (6, 7), thus the plasma region with the highest energy density is spatially decoupled from the plasma anchors (6, 7). The high-frequency plasma light source (1) includes: - a pressure chamber (5) containing a gaseous medium, in the operating state, a luminescent plasma is formed within the pressure chamber; - an impedance converter (4) assembly connected to the pressure chamber (5) and including a coupling pin (8) for coupling electromagnetic waves into the high-frequency plasma light source (1) and having an internal guide... The inner conductor (9) and the outer conductor (9b) are coaxial conductors (9a) and (9b), wherein a dielectric pressure seal (13) and at least one conductive or dielectric connector (10, 12) are provided between the inner conductor (9a) and the outer conductor (9b), an inner conductor plasma anchor (6) extending into the pressure chamber (5) and electrically and mechanically connected to the inner conductor (9a) of the coaxial conductor (9), and an outer conductor plasma anchor (7) having a first end (7a) located in the pressure chamber (5) and a second end (7b) mechanically connected to the inner surface of the pressure chamber (5).

The application discloses a rigid-flexible coupling bionic pectoral fin wave-slap cooperative motion parameter optimization method, generates a pose and a speed by coupling a three-degree-of-freedom rigid wave-slap and a span / chordwise flexible traveling wave under a unified coordinate and a parameterized framework, and constructs a generator layer combining a reduced-order dynamics and physical supervision; a hydrodynamic mapping model is formed by using a numerical simulation and a pool experiment in parallel, a multi-fidelity decomposition and a Gaussian process prior based on correlation and difference, outputting a hydrodynamic coefficient posterior mean and uncertainty, and mapping into a mechanical system resultant force and resultant moment; finally, three types of multi-objective robust closed-loop optimization of propulsion priority, disturbance priority and balanced propulsion are constructed, a multi-objective evolutionary algorithm and realizability projection and online updating are combined, and robust optimal parameters are obtained; the method can realize high-precision modeling, real-time optimization and intelligent control of the pectoral fin wave-slap cooperative motion, and significantly improves the propulsion efficiency, attitude stability and environmental adaptability of the bionic robotic fish.

The application relates to the technical field of optical devices, and discloses a hetero-integrated thin-film lithium niobate wafer coupling structure, a preparation method and an optical device. The application comprises a thin-film lithium niobate photonic chip, and the thin-film lithium niobate photonic chip is integrated with a III-V active waveguide layer through a hetero-integrated wafer bonding technology; the thin-film lithium niobate photonic chip is provided with a lithium niobate waveguide layer, and the output end of the lithium niobate waveguide layer is coupled with the input end of the III-V active waveguide layer in a vertical evanescent wave mode; and the III-V active waveguide layer is covered with an N-type metal electrode and a P-type metal electrode. The III-V active waveguide layer is integrated onto the lithium niobate photonic chip through the hetero-integrated wafer bonding technology, and the function of on-chip light detection of the thin-film lithium niobate platform is realized. The III-V active waveguide layer and the thin-film lithium niobate photonic chip are optically interconnected in a vertical evanescent wave coupling mode through an III-V / LN mode spot converter which is designed in an optimized mode, and high-efficiency coupling between the III-V active waveguide layer and the lithium niobate waveguide is realized.

The present application belongs to the technical field of comprehensive utilization of marine renewable energy, in particular to a wind and wave energy multi-degree-of-freedom wide-band control method based on hetero-frequency coupling, comprising: identifying the frequency domain of wind and wave environment characteristics, and constructing a wind and wave hetero-frequency energy coupling model; designing a hetero-frequency energy regulation and conversion mechanism based on the motion response characteristics of a multi-degree-of-freedom floating platform; and adopting a full-working-condition dynamic optimization control strategy to realize the collaborative operation of wind energy conversion units and wave energy conversion units and adaptive energy flow distribution. The present application establishes a hetero-frequency wind and wave coupling dynamics model in view of the significant differences and relevance of wind energy and wave energy in frequency characteristics, time scale and spatial distribution, realizes wide-band capture of low-frequency wind-induced and high-frequency wave-induced coupled energy in complex sea conditions through multi-degree-of-freedom motion decoupling and state observation, effectively improves the energy utilization rate, attitude stability and structural safety of the system, and has good robustness and engineering adaptability.

The invention discloses a mode and AI fused marine forecasting method, system and device and a medium, and belongs to the technical field of marine forecasting, and the method comprises the steps: constructing a multi-dimensional feature library of dynamic weights through fusing historical reanalysis, satellite remote sensing and wind power plant actual measurement data, and precisely matching historical similar states. An atmosphere-sea wave-sea current mode and a layered nested grid are driven, a high-precision initial physical field is generated in combination with three-dimensional variational assimilation, downscaling is carried out by using a multi-task deep learning model, wave steep parameters are corrected through a sea-air-wave coupling mode, refined description of a physical process is realized, and finally, real-time observation rolling correction is combined, so that the real-time real-time observation rolling correction is realized. And data-mode-learning closed-loop optimization is formed. According to the method, the forecasting precision and timeliness of the offshore wind power environment elements are remarkably improved, and reliable decision support is provided for wind power plant site selection, operation and maintenance and safe operation.

The invention discloses a heart-shaped channel positive and negative wave coupling sound production and pickup device. A sound box relates to the technical field of acoustics, and is characterized in that a plurality of sound outlet holes are formed in the front surface of a box body shell along the edge of the box body shell; the loudspeaker unit is embedded in the box body shell and faces the front face of the box body shell, and the other face of the loudspeaker unit is located in the box body shell; the heart-shaped main cavity and the crescent-shaped auxiliary cavity are arranged in the box body shell, the heart-shaped main cavity is arranged on the peripheral side of the loudspeaker unit in a surrounding mode, and the crescent-shaped auxiliary cavity is located below the heart-shaped main cavity. According to the heart-shaped channel positive and negative wave coupling sound production and pickup device, a heart-shaped main cavity is firstly filled with backward waves generated by vibration of a vibrating diaphragm of a loudspeaker unit, and the backward waves enter a crescent-shaped auxiliary cavity through an opening in the apex part of the heart-shaped main cavity according to the physical function characteristics of the heart shape; and the air enters the air through a plurality of small holes distributed in the edge part of the crescent-shaped auxiliary cavity and is coupled with the forward wave of the loudspeaker unit.

This invention provides a full-physics field simulation test device and method for shipborne aircraft fuel fires based on wind-wave coupling effects, relating to fire safety. The device includes: a shipborne aircraft simulation component comprising an aircraft support, fuel tank, attitude adjustment mechanism, and at least one ammunition simulator; a ship simulation component comprising a fuel pan and a swing mechanism connected to the fuel pan; a sea breeze environment simulation component comprising a water mist spraying mechanism and a fan; and a data acquisition system for collecting data on the wind field, flame, and surface temperature and radiant heat flux of the ammunition simulator under wind-wave coupling conditions, thereby quantifying the degree of thermal stimulation of the ammunition under different operating conditions. The beneficial effects of this invention are: it enables the simulation of dynamic ammunition thermal exposure of shipborne aircraft under ocean wind-wave coupling conditions, filling the research gap in existing technologies that can only simulate static ammunition thermal exposure, and enabling a systematic study of the impact of ammunition attitude changes on the uniformity of thermal exposure.

The application discloses an embedded light wave-electromagnetic wave coupling detection head and a hydraulic parameter measurement method thereof, and belongs to the technical field of engineering safety monitoring. The detection head is of a point type structure, comprising a packaging shell, a photosensitive sensing core and an electromagnetic excitation sensing core. The packaging shell is made of high-strength corrosion-resistant non-metallic material, and a sensing window is arranged at the front end. The photosensitive sensing core realizes stress and temperature separation detection through a series connection of double-wavelength fiber Bragg gratings. The electromagnetic excitation sensing core emits high-frequency electromagnetic waves through a micro electromagnetic coil or an interdigital electrode array. The measurement method comprises photoelectric signal synchronous acquisition, double decoupling compensation based on a temperature reference, water content and stress parameter inversion and coupling state research and judgment. The application realizes high-precision monitoring of water and force parameters at the same point, solves the problems of single parameter and high false alarm rate of traditional technologies, and is suitable for safety monitoring and hierarchical early warning of high-risk nodes of underground pipelines.

The invention provides a ship body fatigue damage evolution model parameter calculation method under a multi-field coupling effect, and relates to the technical field of ocean structure fatigue damage prediction.The ship body fatigue damage evolution model parameter calculation method comprises the steps that historical data of an environment foundation field, a discrete phase medium field and a ship body motion field of a target sea area are collected to construct a dynamic boundary sequence; a ship body-crushed ice-wave coupling model is established based on a CEL method, and stress time histories of key parts such as a ship bow, a ship side and a ship bottom are obtained in real time; then, a rain flow counting method is adopted to process the stress time history to generate a multi-stage load spectrum, fatigue tests at different temperatures are combined to obtain a corrected S-N curve, finally, the load spectrum is sequentially substituted into the corrected curve, and the residual fatigue life of each key part under the condition of considering historical accumulated damage and real-time temperature is calculated. And accurate prediction of the fatigue damage of the hull structure in the polar navigation environment is realized.