24 results about "Stress diffusion" patented technology

The invention relates to the technical field of highway engineering monitoring, in particular to an acoustic emission diagnosis method and system for fatigue cracks of a heavy-duty highway, and the method comprises the steps: collecting acoustic emission signals by a multi-depth piezoelectric ceramic sensor array pre-buried in a pavement structure; carrying out time-frequency domain topological feature extraction on the collected signals, wherein the time-frequency domain topological feature extraction comprises wavelet packet entropy value mapping and phase-space reconstruction, and extracting topological invariants such as correlation dimensions and Lyapunov indexes; inputting the time-frequency feature vector into a transfer learning model to realize multi-scale feature fusion, and innovatively adopting a gradual change domain to realize smooth transition from a source domain to a target domain; a fractal stress field model is constructed based on the fusion features, and stress diffusion depth estimation and crack evolution prediction are achieved; a crack propagation area is automatically marked through correlation coefficient analysis, a crack temperature diagram is generated, and a maintenance decision suggestion is output, so that early-stage microcrack detection of the heavy-load highway is realized, the detection sensitivity is improved by about 35%, and the depth positioning precision reaches + / -1.5 cm.

The invention discloses a building roof water leakage detection method and system, and relates to the technical field of monitoring analysis, and the method comprises the steps: guiding drilling equipment to carry out the punching operation based on a micropore path topological graph, collecting the real-time deformation parameters of the peripheral region of a hole site, carrying out the internal stress gradient analysis of a waterproof layer material, and generating a hole site stress diffusion vector diagram; performing spatial registration fusion on the waterproof layer three-dimensional density distribution model and the hole site stress diffusion vector diagram, calculating a potential leakage probability corresponding to the waterproof layer around each hole site, performing spatio-temporal evolution simulation on the potential leakage probability, and outputting a dynamic leakage risk thermodynamic diagram; and performing water leakage path reverse tracking modeling by combining the dynamic leakage risk thermodynamic diagram and the waterproof layer three-dimensional density distribution model, generating a roof water leakage detection optimization model, and transmitting the water leakage detection optimization model to a monitoring terminal to implement real-time water leakage early warning. The method has the effect of improving the water leakage detection efficiency.

The invention relates to the technical field of road engineering material design and calculation, and discloses a calculation method for pervious concrete double-layer grating arrangement parameters. According to the method, a geogrid working performance coefficient, a grid interlayer spacing optimization factor, an effective permeability rate correction coefficient, an interlayer synergistic effect coefficient, a layered stress diffusion factor and a permeability comprehensive index are introduced for the first time, a quantitative evaluation model is constructed, and a multi-dimensional performance index and a structure response function are constructed. The structural mechanical behavior and permeability of the pervious concrete are comprehensively considered, and the double-layer arrangement position and interlayer spacing of the geogrid are determined. The blindness of traditional empirical layout is overcome, and the method is suitable for road structure design under medium and heavy traffic loads. According to the method, a scientific and computable double-layer arrangement parameter determination method is established, and collaborative optimization of the grid enhancement effect and the water permeability performance is achieved.

The application discloses a building roof leakage detection method and system, and relates to the technical field of monitoring and analysis, which comprises the following steps: guiding a drilling device to perform a punching operation based on a micropore path topology graph, collecting real-time deformation parameters of a surrounding area of a hole site and performing internal stress gradient analysis on a waterproof layer material to generate a hole site stress diffusion vector graph; performing space registration and fusion on a three-dimensional density distribution model of the waterproof layer and the hole site stress diffusion vector graph, calculating potential leakage probabilities corresponding to the waterproof layer around each hole site, performing time-space evolution simulation on the potential leakage probabilities, and outputting a dynamic leakage risk heat map; performing reverse tracking modeling of a leakage path in combination with the dynamic leakage risk heat map and the three-dimensional density distribution model of the waterproof layer to generate a roof leakage detection optimization model, and transmitting the roof leakage detection optimization model to a monitoring terminal to implement real-time leakage early warning. The application has the effect of improving leakage detection efficiency.

The invention discloses a cross-cut coal uncovering multi-stage extraction outburst elimination device and a cross-cut coal uncovering multi-stage extraction outburst elimination method. A cross-cut coal uncovering multistage extraction outburst elimination device comprises a center shaft, a drilling pressure relief device, a stress diffusion device, a connecting assembly and a deep clearing device, and the drilling pressure relief device is fixed to the front end of the center shaft; the stress diffusion device is fixed on the central shaft and is fixedly connected with the drilling pressure relief device; the connecting assembly is arranged on the center shaft in a sliding mode and rotationally connected with the end, away from the drilling pressure relief device, of the stress diffusion device; one end of the deep clearing device is fixedly connected with the connecting assembly, and the other end is slidably connected with the connecting assembly. According to the method, coal body adsorption balance is destroyed through vibration loads, deep residual gas is thoroughly removed, deep coupling of multi-stage extraction and stress release is achieved, and finally the coal seam outburst danger is eliminated.

The application discloses a stress-guided low-temperature cutting device and a cutting method thereof, and relates to the technical field of brittle material cutting. The stress-guided low-temperature cutting device comprises a roller and a spraying module which are installed in a main body. Periodic distribution of indentation teeth is arranged on the surface of the roller to press periodic grooves on the surface of a plastic strip, form a stress concentration guide belt, make the stress of a cutting hob release along the groove path, and then spray refrigerant to the groove in a direction through the spraying module to realize local embrittlement, so that the groove preferentially breaks under the stress of the cutting hob. Through the synergistic effect of the pre-indentation stress and the refrigerant directional embrittlement, the material fracture behavior is changed from random fracture to controllable fracture, the neatness of the cutting section is improved, and the precise and efficient cutting of the plastic strip is realized. Not only the problems of irregular section or material tearing caused by stress diffusion in the traditional cold cutting process are avoided, but also the cutting load is significantly reduced.

The invention relates to the technical field of mechanical property testing, in particular to a laminated plate mechanical property evaluation method and system based on strain data. The method comprises the following steps: performing a biaxial tensile experiment on a laminated plate sample, synchronously acquiring load time-history data and a full-field speckle image, constructing a full-field strain matrix through a mapping algorithm, dispersing the full-field strain matrix into nodes, dividing a core pure shear region and a stress diffusion region, and then obtaining first principal strain through principal component analysis; a load transmission efficiency attenuation spectrum and full-field strain energy entropy density are calculated respectively, a dynamic correction model is constructed in combination with weighted coupling of preset shape characteristic parameters, and a real constitutive curve is obtained by using the model to calculate correction coefficient inversion nominal stress; the thermodynamic entropy characteristic is introduced, so that the problem that the stress field distortion at the nonlinear damage stage of the material is difficult to sense by a traditional method is solved, and the biaxial mechanical property test precision of the laminated plate is effectively improved.

The present application provides a method and system for analyzing stratum disturbance under the coupling effect of shield construction. In particular, the cutting vibration spectrum data is collected in real time by the cutterhead vibration sensor, and a feature fingerprint library containing the vibration energy distribution pattern and the critical grouting interval is constructed in combination with the soil parameters. The vibration spectrum is aligned with the soil bin pressure in time and space to generate a disturbance field distribution map showing the energy gradient distribution curve and the stress diffusion path topology. Through the feature matching network optimized by transfer learning, the energy distribution curve is matched and the stratum interface propagation parameters are corrected, and the stratum type identification results and the disturbance dynamic parameters are output. Based on the mapping relationship between the parameters and the critical grouting interval, the surface displacement data is linked to dynamically control the grouting pressure, generate graded warnings and parameter adjustment instructions, and form a stratum disturbance monitoring and control closed loop. The technical solution provided by the present application realizes the dynamic optimization of grouting pressure and significantly reduces the risk of stratum deformation caused by shield construction.

The present application relates to the technical field of mechanical property testing, and more particularly to a method and system for evaluating the mechanical properties of a laminate based on strain data. The method comprises the following steps: performing a biaxial tensile test on a laminate sample, simultaneously collecting load time history data and full-field speckle images, constructing a full-field strain matrix and discretizing it into nodes using a mapping algorithm, dividing the core pure shear zone and stress diffusion zone, obtaining the first principal strain through principal component analysis, calculating the load transfer efficiency attenuation spectrum and the full-field strain energy entropy density, respectively, combining the preset shape feature parameters to construct a dynamic correction model, and using the model to calculate the correction coefficient to obtain the true constitutive curve by inverting the nominal stress. The introduction of thermodynamic entropy characteristics solves the problem of stress field distortion in the nonlinear damage stage that is difficult to perceive by traditional methods, effectively improving the accuracy of biaxial mechanical property testing of laminates.

The invention discloses a stress guiding type low-temperature cutting device and a cutting method thereof, and relates to the technical field of brittle material cutting, the stress guiding type low-temperature cutting device comprises a roller wheel and a spraying module which are installed in a main body, indentation teeth which are periodically distributed are arranged on the surface of the roller wheel, so that periodic grooves are formed in the surface of a long plastic strip in a pressing mode, and a stress concentration guiding belt is formed; the stress of the cutting hob is released along the path of the groove, and then a refrigerant is directionally jetted to the groove through the jet module to realize local embrittlement, so that the groove is preferentially broken under the stress of the cutting hob. Through the synergistic effect of pre-indentation guiding stress and refrigerant directional embrittlement, the material fracture behavior is converted into controllable fracture from random fracture, the uniformity of the cut section is improved, and precise and efficient cutting of long plastic strips is achieved. Not only is the problem of irregular section or material tearing caused by stress diffusion in the traditional cold cutting process avoided, but also the cutting load is obviously reduced.

The invention provides a wind power bearing ring forge piece and a heat treatment process, and relates to the technical field of forge piece heat treatment, the wind power bearing ring forge piece comprises an inner ring, an outer ring, a raceway area and a non-raceway area; the raceway area is continuously arranged in the circumferential direction of the bearing ring, and an integrally-formed stress diffusion structure is arranged below the raceway area; the mechanical property of the bearing ring is optimized through the design of a stress diffusion structure, a variable cross-section transition area and an annular reinforcing rib, uniform stress dispersion, quenching uniformity improvement and construction of a high-hardness wear-resistant layer on the surface of a raceway are achieved by combining hot rotary swaging shaping, bainite isothermal quenching and a double-stage induction quenching process, the anti-fatigue life is remarkably prolonged, and the comprehensive performance of the material is remarkably improved; the problem of fatigue failure caused by stress concentration, non-uniform quenching hardness and insufficient surface wear resistance of the wind power bearing ring under the action of alternating load is solved.

The present application relates to the technical field of highway engineering monitoring, in particular to a heavy-load highway fatigue crack acoustic emission diagnosis method and system, comprising: a multi-depth piezoelectric ceramic sensor array embedded in a pavement structure to collect acoustic emission signals; time-frequency domain topology feature extraction is performed on the collected signals, including wavelet packet entropy value mapping and phase space reconstruction to extract topological invariants such as correlation dimension and Lyapunov exponent; the time-frequency feature vector is input into a transfer learning model to realize multi-scale feature fusion, and a gradual domain is innovatively used to realize smooth transition from a source domain to a target domain; a fractal stress field model is constructed based on the fused features to realize stress diffusion depth estimation and crack evolution prediction; correlation coefficient analysis automatically marks the crack propagation area, generates a crack temperature map and outputs maintenance decision suggestions, realizes early detection of micro-cracks on heavy-load highways, and improves the detection sensitivity by about 35%, and the depth positioning accuracy reaches ±1.5 cm.

The invention relates to a prestress tensioning system and a construction method thereof, and relates to the technical field of precast beam tensioning pedestals, the system comprises a base and end cross beams, the number of the end cross beams is two, the two end cross beams are symmetrically and fixedly installed on the base, the number of the steel strands is multiple, and the two ends of each steel strand are arranged on the two end cross beams in a penetrating mode respectively; the multiple sets of embedded parts are symmetrically embedded in the two end cross beams respectively, and the steel strands are arranged in the embedded parts in a penetrating mode. The stress diffusion piece comprises a stress plate, a plurality of stress holes are formed in the stress plate, and the steel strands are arranged in the stress holes in a penetrating mode in a one-to-one correspondence mode; the multiple reinforcing plates are fixedly installed on the stress plate, and the reinforcing plates are connected with the embedded parts; the bottom plate is fixedly installed at the bottom of the stress plate and fixedly connected with the reinforcing plate. The application has the effects of reducing the local stress generated by the prestressed steel strand to the end cross beam and preventing the prestressed steel strand from damaging the end cross beam.

The application relates to a prestress tension system and a construction method thereof, and relates to the technical field of a prefabricated beam tension pedestal. The system comprises a base and end crossbeams. Two end crossbeams are symmetrically and fixedly installed on the base. A plurality of steel strands are arranged. The two ends of the steel strands are respectively arranged on the two end crossbeams. A plurality of groups of embedded parts are symmetrically embedded on the two end crossbeams. The steel strands are arranged in the embedded parts. A stress diffusion part comprises a stress plate. A plurality of stress holes are arranged on the stress plate. The steel strands are correspondingly arranged in the stress holes. A plurality of reinforcing plates are arranged. The reinforcing plates are fixedly installed on the stress plate. The reinforcing plates are connected with the embedded parts. A bottom plate is fixedly installed at the bottom of the stress plate. The bottom plate is fixedly connected with the reinforcing plates. The prestress steel strands can reduce the local stress generated on the end crossbeams, and the prestress steel strands can avoid damaging the end crossbeams.

The utility model discloses a lateral bending prevention structure for truss installation, which relates to the technical field of building construction and comprises a vertical H-shaped steel beam group, a beret piece side rod group, a reinforcing rib fastener and a support column. According to the lateral bending prevention structure, the lateral bending prevention supporting degree of a top truss of the whole frame structure can be achieved when chord members of the beret piece side rod sets and the string truss bases are combined and welded to T-shaped reinforcing rib plates of the vertical H-shaped steel beam sets; the chord member and the string truss seat have the supporting strength of combined unloading diffusion stress stability and instability prevention, so that when the first H-shaped cross beam and the second H-shaped cross beam are crosswise fixed at the top of the supporting column, the secondary anti-side-bending truss at the bottom end and the supporting column can be welded through reinforcing rib fasteners welded and fixed at the bottom of the vertical steel beam column and the bottom of the rear supporting rod; the C-shaped reinforcing rib plates between the cover plate and the bottom frame are buckled with the buckling ribs, so that the surrounding degree of the connecting end of the truss and the load bearing coefficient of the stress ribs can achieve the effect of stable load.

The utility model relates to the technical field of electrical bushings, and discloses a stress whitening prevention colored PVC electrical sheath tube, which comprises an inner layer, a middle buffer layer and an outer layer which are coaxially arranged and are integrally extruded and molded. The inner layer is of a smooth cylinder structure, the outer layer is a closed annular protective shell, and the middle buffer layer is used for relieving stress concentration and preventing the surface from becoming white. The middle buffer layer is of a corrugated structure or a honeycomb structure and has good deformation energy absorption capacity, stress can be effectively released when the pipe is subjected to external force such as bending and compression, and the visual whitening phenomenon on the surface of the outer layer is avoided. The outer surface of the outer layer can be provided with uniformly distributed convex rib structures to guide stress diffusion, so that the use reliability of the protective sleeve is improved. The cable is simple in structure and convenient to manufacture, and the three-resistance stress whitening performance and the appearance stability of the sheath pipe can be remarkably improved.

The invention relates to the technical field of hoisting apparatus detection, and discloses a PHM-based hoisting apparatus state test and verification method. The method comprises the following steps: extracting design parameters from a technical document of the hoisting apparatus, synchronously acquiring high-frequency operation characteristics when the apparatus is started, and judging whether a multi-dimensional state evaluation process is started or not by fusing two types of data. After starting, firstly calculating an instrument design robustness index and detecting a structure vibration condition, and combining the two to complete modular segmentation and extract a plurality of groups of evaluation units; continuously monitoring the vibration deviation and the stress diffusion speed of each unit, evaluating the contribution degree of the vibration deviation and the stress diffusion speed to the state deviation to obtain a contribution factor, and tracking the continuous interval of the load at the same time. And unit rating is completed based on the load continuous interval and the contribution factor, the interface stress and the tolerance limit load are collected to derive rating weights, finally the unit rating and the weights are integrated, the health index of the hoisting apparatus under the current working condition is generated, and comprehensive and accurate evaluation of the apparatus state is achieved.

This invention belongs to the field of bridge engineering technology, specifically disclosing a stress-enhancing structure and method for anchorage blocks in tied arch bridges. The enhancement structure includes a base, a first stress-transmitting component, a first support seat, and multiple second stress-transmitting components. The base consists of a foundation plate and a pipe forming a limiting groove. The first stress-transmitting component is engaged within the limiting groove and cooperates with the first support seat. The second stress-transmitting components connect the first support seat and the foundation plate, forming a multi-level stress diffusion system. This invention, through the base, first stress-transmitting component, first support seat, and second stress-transmitting components forming a multi-level stress-bearing and stress-diffusion structure, can transmit and evenly distribute the concentrated tension force transmitted by the anchorage in layers, changing the highly concentrated stress transmission method in traditional anchorage structures. From the stress mechanism perspective, it reduces the local stress peak value of the anchorage block, avoiding cracking, crushing, or fatigue failure caused by stress spikes in the anchorage area.

This invention discloses a method for calculating the damage degree of a cracked T-beam element using the stress diffusion angle method. The steps are as follows: Set an appropriate number of measuring points for the cracked T-beam; calculate the relative crack height ζ based on the crack height and the T-beam cross-sectional height; calculate the additional spring stiffness parameter of the crack based on ζ, which can be calculated according to the stress intensity factor handbook; calculate the crack stress diffusion angle α(ζ), using a rectangular cross-section beam and the equivalent crack element linear stiffness method, the calculation formula for the linear diffusion mode is α(ζ) = 74.5 - 28.895ζ; calculate the moment of inertia of the undamaged T-beam cross-section; calculate the moment of inertia of the beam segment cross-section in the stress diffusion part; calculate the damage degree of the T-beam element using the stress diffusion angle method; calculate the damage degree of the T-beam element with the corrected crack height. The number of beam segments N on one side of the stress diffusion part should not be less than 100. This invention proposes a theoretical calculation method for the damage degree of a cracked T-beam element, providing a theoretical basis for the design and calculation of the actual damage degree of the T-beam when conducting quantitative damage degree tests.

The invention relates to the technical field of underground engineering structure safety monitoring, and discloses an intelligent pressure detection method suitable for a basement side wall. According to the method, multiple groups of sensing units are started, multi-dimensional sensing signals with space codes are obtained, and calibrated stress data flow is generated through signal purification and compensation. And importing the data stream into a dynamically updated knowledge graph network for situational analysis, wherein the network integrates the structural member relationship, the historical load and the geological archive information. Under the situation, a pressure evolution deduction process is started, a stress diffusion process is simulated, and a stress abnormal evolution track deviating from a normal mode is identified through multi-round iterative comparison with a knowledge base. Extracting core features such as space-time coordinates and diffusion rate of the trajectory, and packaging the core features into an abnormal event descriptor; according to the method, the situational depth interpretation of the pressure data and the early recognition of the abnormal evolution trajectory are realized.

The application provides a kind of additional arbitrary load earth pressure calculation method of retaining structure top in foundation pit engineering, and belongs to the field of foundation pit engineering.The method includes: carrying out strip block division to effective arbitrary load, for the i th strip block, the additional load F i Is calculated, and according to stress diffusion principle, the additional stress Δσ i After diffusion, additional stress acting on local soil is calculated i ;According to Rankine active earth pressure calculation principle, the resultant force E ai Of active earth pressure in the influence range of each strip block is calculated;According to the resultant force E ai Of active earth pressure in the influence range of each strip block, the total resultant force of active earth pressure acting on retaining structure is calculated.The application calculates the earth pressure of retaining structure based on strip block division method and stress diffusion principle, and provides a feasible method for the calculation of earth pressure of retaining structure top under the action of arbitrary additional load.

The present application relates to the technical field of mine exploitation and tunneling support, more particularly to a temporary support optimization method, system and device based on a stress diffusion model, the method comprising: establishing a temporary support stress diffusion model, and obtaining the distribution characteristics of the temporary support stress field in the unsupported area of the roadway surrounding rock based on the temporary support stress diffusion model; analyzing the characteristics of the stress field generated by the temporary support in the unsupported area of the roadway surrounding rock through numerical simulation experiments; verifying the temporary support stress diffusion model; obtaining factors affecting the stability of the surrounding rock in the unsupported area of the roadway surrounding rock; determining the linear relationship between the optimal temporary support force and the unsupported distance; and deducing the optimal temporary support force; determining the maximum unsupported distance based on the attenuation degree of the temporary support stress; and summing the length of the temporary support area and the unsupported distance, thereby designing and optimizing the cutting parameters and temporary support parameters; and the present application can achieve efficient development of coal resources.

The application relates to the technical field of underground engineering structure safety monitoring, and discloses an intelligent pressure detection method suitable for basement side walls. The method starts multiple sensing units, acquires multi-dimensional sensing signals with space coding, generates calibrated stress data streams through signal purification and compensation. The data streams are introduced into a dynamically updated knowledge graph network for situational analysis. The network integrates structural component relationships, historical load and geological archive information. In this context, a pressure evolution deduction process is started to simulate the stress diffusion process. Through multiple rounds of iteration comparison with the knowledge base, stress abnormal evolution trajectories deviating from the normal mode are identified. The time-space coordinates and diffusion rate of the trajectories are extracted as core features and encapsulated as abnormal event descriptors. The application realizes situational deep interpretation of pressure data and early identification of abnormal evolution trajectories.

The invention discloses a prestressed anchoring system adaptive steel belt design method based on a reinforced beam failure theory, and relates to the field of tunnel engineering prestressed anchoring system.The method comprises the steps that firstly, a surrounding rock and base plate interaction model is established, and an anchoring angle beta is determined through prestress loading and stress nephogram analysis; constructing a triangular stress diffusion model on the basis of beta and the support distance l, calculating the effective bearing rock stratum thickness h0, calculating the height xi of the relative compression area by combining h0, an overburden load q and the compressive strength sigma c of the surrounding rock and adopting a single-rib rectangular bending model, comparing the height xi with a threshold value xi b, finally checking whether the reinforcement ratio rho meets the condition that rho is greater than or equal to rho min, and correcting the reinforcement ratio rho into As1 according to rho min when the reinforcement ratio rho is not greater than rho min. From the angle of joint supporting of the steel belt and the rock mass, the self-bearing performance of the rock mass is fully exerted, ductile failure of the surrounding rock and the steel belt is achieved, and sudden failure is avoided.