183 results about "Axial strain" patented technology

The invention discloses an inversion method of fracturing fracture parameters based on distributed optical fiber strain. The method comprises the following steps: firstly, acquiring a horizontal well distance and a vertical well distance in an adjacent well monitoring scene, a distributed optical fiber scale distance Lg and axial strain observation data epsilon acquired by a low-frequency DAS system, and initializing an inversion model; on the premise that a fracturing crack meets an optical fiber, a crack height H0 is preset, a constraint matrix A is adjusted to be an A1 matrix constraint inversion model (1), w in the inversion model (1) is w1, and w1 is solved through a hybrid-LSQR iterative algorithm; according to the solved w1, the constraint matrix A is adjusted to be A0, the crack propagation boundary is not constrained, w in the inversion model (1) is w0, and w0 is solved through a hybrid-LSQR iterative algorithm; iterative optimization is carried out, the fracture height with the error between the fracture width w0 obtained through A0 constraint inversion and the fracture width w1 obtained through A1 constraint inversion being smaller than a threshold value delta is solved, and in this way, fracturing fracture parameters are quantificationally inverted through distributed optical fiber strain data.

The invention relates to the technical field of digital pump operation control, in particular to a digital pump operation method and system, and provides the following scheme that winding temperature gradient distribution, axial strain and cooling liquid dielectric property parameters are collected and input into a preset finite element thermal model, boundary conditions are corrected by adopting an adjoint matrix method, and the temperature gradient distribution, the axial strain and the cooling liquid dielectric property parameters are obtained. And reconstructing a three-dimensional transient heat flux density field to realize precise positioning of a local overheating area. Contribution of a heat source item to a temperature field is calculated based on sensitivity analysis, a heat flow density field is optimized in combination with the Fourier law, and calculation precision is improved. The device is suitable for the fields of urban water supply, petrochemical engineering, aviation fuel pumps and the like, the heat management precision of equipment can be improved, the service life is prolonged, and the operation efficiency is improved.

The invention relates to the technical field of safety management, in particular to a mine safety production risk prevention and control method based on multi-source data fusion, and the method comprises the following steps: constructing a coupling parameter set through a micro-seismic sensor and a temperature and humidity sensor, detecting and extracting displacement points through Bayesian regression, and drawing a deformation diagram; determining a displacement area, counting an airflow velocity gradient, extracting a main fracture direction, generating an airflow path diagram, calculating a curvature change rate, positioning a sudden change area, extracting a thermal strain rate and an axial strain rate, generating a smooth curve, identifying a risk point, and expanding a boundary when the overlapping rate exceeds 60%, and redrawing a mine thermal-mechanical coupling risk map. According to the method, a multi-parameter analysis framework is constructed through micro-seismic and temperature and humidity data coupling to extract a deformation active band, difference statistics airflow velocity gradient is combined with a crack direction to correct an airflow path, a sudden change area is positioned based on a curvature change rate mean threshold, and thermal strain and axial strain are extracted to screen risk points. And constructing thermal variable amplitude mapping to represent the rock mass instability risk.

The invention is suitable for the technical field of automobile fuel injection nozzle forging, and particularly relates to an automobile fuel injection nozzle forge piece forging method and equipment. The method comprises the steps that metal flow resistance, metal flow speed, forging vibration data and lateral force are obtained; determining a target flow velocity based on the metal flow resistance, the metal flow velocity and the forging vibration data; determining an axial strain coefficient and a radial strain coefficient based on the metal flow resistance, the metal flow velocity, the forging vibration data and the lateral force; based on the axial strain coefficient and the target flow velocity, generating a sliding block control instruction, and based on the radial strain coefficient, generating an ejector rod control instruction; and according to the sliding block control instruction and the ejector rod control instruction, a forging and pressing device and a hydraulic device are controlled to forge the automobile oil nozzle forge piece. According to the method, the forge piece forming precision, the production efficiency and the intelligence and automation level of the forging process can be remarkably improved.

The invention provides an oil and gas pipeline monitoring system based on a distributed optical fiber technology. The oil and gas pipeline monitoring system can monitor the strain and the internal pressure of a pipeline at the same time. The distributed monitoring of the axial strain of the pipeline and the quasi-distributed monitoring of the internal pressure are realized by laying the accompanying strain optical fiber beside the pipeline and winding and fixing the optical fiber in the circumferential direction of the pipeline at intervals. The system utilizes the BOTDA or BOTDR host to demodulate the data measured by the optical fiber and transmits the data to the local or cloud computer for processing, so that the pipeline axial strain and the area with large pressure change in the pipeline can be effectively monitored, and the system is used for providing corresponding early warning information. According to the method, the optical fiber originally used for strain monitoring can also be used for pressure monitoring, and the effect that one fiber has multiple purposes is achieved. The system is simple in design, easy to implement and suitable for real-time monitoring and maintenance management of large-scale oil and gas pipelines.

The invention discloses an optical fiber three-dimensional shape sensor based on an optical frequency domain reflection technology and an application method of the optical fiber three-dimensional shape sensor, the optical fiber three-dimensional shape sensor comprises a base material and more than three optical fibers, and all the optical fibers are spirally wound and fixed on the surface of the base material at equal intervals and constant screw pitches to form distributed sensing units; according to the application method, measurement signals of all the optical fibers are obtained, and axial strain and strain are calculated; calculating the total curvature vector of the reconstruction curve of the measured object; calculating a bending direction angle and a curvature of the reconstruction curve of the measured object; performing differential calculation on the bending direction angle to obtain the torsion rate of the reconstructed curve of the measured object; and reconstructing the three-dimensional shape of the measured object according to the curvature and the torsion of the reconstructed curve of the measured object. The invention aims to realize synchronous measurement of bending, torsion and axial strain by using a distributed sensing unit formed by a multi-fiber structure which is spirally wound at the same interval and at a constant screw pitch.

The invention discloses a method and system for analyzing the rolling resistance of a concrete-filled steel tube combined pier column, and the method comprises the steps: applying an axial compression load to the concrete-filled steel tube combined pier column, and dividing the cross section of the concrete-filled steel tube combined pier column into three layers of regions along a radial material change part; according to corresponding total cross-section average axial strain generated by the steel pipe concrete combined pier column when different axial compression loads are applied, equivalent stress corresponding to each layer of area is calculated, total axial force corresponding to each total cross-section average axial strain is calculated, and a total cross-section average axial strain-total axial force curve is formed; searching a first total cross-section average axial strain corresponding to the maximum value of the total axial force in the total cross-section average axial strain-total axial force curve and a second total cross-section average axial strain corresponding to a first obvious inflection point of the total cross-section average axial strain-total axial force curve, and calculating a ductility coefficient, and judging whether the concrete-filled steel tube composite pier column meets the ductility design requirement or not.

The invention discloses a roadway roof damage time prediction method and system, and belongs to the technical field of mine rock mechanics and safety engineering. Comprising the following steps: recognizing a roof rock stratum structure and lithology of each layer through drilling peeping, and drilling a representative rock sample; determining the crack initiation strength and peak strength of the rock sample through a uniaxial compression test; selecting a plurality of stress levels between the axial strain and the acoustic emission signal to carry out a creep test, synchronously monitoring the axial strain and the acoustic emission signal, and determining an accelerated creep starting moment as the damage time under the stress according to the abrupt change characteristics of the axial strain and the acoustic emission signal; establishing a stress-failure time relation model of each lithology; finally, selecting a corresponding model to predict the damage time of rocks at different layers of the roof according to the actual rock stratum structure and ground stress state of the roadway; according to the method, accurate and reliable time prediction of the progressive damage process of the roadway roof is realized.

The invention provides an OFDR-based rock surface strain field test method and system, and particularly relates to the technical field of rock dynamic failure monitoring, the method comprises the following steps: winding a distributed optical fiber on the outer surface of a rock sample to obtain an annular optical fiber and a spiral optical fiber, and applying a compression force to the rock sample to obtain a strain field of the rock surface strain field; according to the optical signals in the circumferential optical fiber and the spiral optical fiber, circumferential strain distribution and axial strain distribution are obtained through calculation, and the method solves the problem that it is difficult to dynamically monitor the surface strain change of the test piece in the failure deformation process in real time with high precision. The effect of real-time dynamic high-precision monitoring of the surface strain of the test piece in the damage deformation process of the test piece is achieved.

Provided are a method and apparatus for calibrating contact parameters of electrode materials, and a computer storage medium. The method includes the following operations. A discrete element simulation test is performed on an electrode material based on a calibration model and calibration ranges of contact parameters of the electrode material when an axial force-displacement curve of a target pellet of the electrode material meets an adaption condition of the contact model; then a simulated axial pressure-axial strain relationship of the electrode material is acquired based on a target discrete element simulation parameter of the electrode material; whether the contact parameters are calibrated successfully is judged based on this relationship; and when the contact parameters are calibrated successfully, calibration results of the contact parameters are determined.

The invention discloses a rock triaxial statistical damage constitutive model construction method based on an energy dissipation theory. The method comprises the following steps: step 1, defining a function relationship between an energy dissipation ratio and an axial strain corresponding to a rock test piece; 2, obtaining a rock damage evolution equation; 3, constructing a rock damage constitutive model; and 4, obtaining stress-axial and radial strain relation curves of the rock through an indoor test, determining mechanical strength parameters and energy parameters of the rock sample according to test data, identifying model parameters according to a test result, and determining a damage threshold value according to an energy dissipation ratio-axial strain relation curve stagnation point. According to the rock triaxial statistical damage constitutive model construction method based on the energy dissipation theory provided by the invention, the problem in the prior art that the rock damage evolution process cannot be represented for a rock material showing obvious nonlinear characteristics in a compaction stage and a residual deformation stage is solved.

The invention discloses a rock stratum three-dimensional crustal stress measurement system and method based on a drill hole deformation principle, and belongs to the technical field of crustal stress measurement. The system comprises a computing terminal, a leading device and a strain measurement device, wherein the leading device comprises a control mechanism arranged in a shell and a leading-in mechanism arranged at the top end of the shell; the strain measuring device comprises an opening-closing type radial strain measuring mechanism and an axial strain measuring mechanism, and the opening-closing type radial strain measuring mechanism, the axial strain measuring mechanism and the leading-in mechanism are all electrically connected with the control mechanism. Meanwhile, the invention discloses a method based on the system, radial deformation and axial deformation are measured by adopting the open-close type radial strain measurement mechanism and the axial strain measurement mechanism, and the open-close type radial strain measurement mechanism and the axial strain measurement mechanism are inserted into the test holes of the rock stratum to be measured, so that the strength of the rock stratum to be measured is not limited; the method is suitable for both soft rock strata and hard rock strata, the application range is expanded, and the measurement precision is improved.

The invention provides a sequential network land subsidence detection method and device based on a distributed optical fiber phase signal. The detection method comprises the following steps: acquiring an axial strain signal and a radial strain signal of a distributed optical fiber of a pre-detection land subsidence band; performing noise reduction processing on the axial strain signal to obtain a first strain signal; enhancing the radial strain signal to obtain a second strain signal; performing multi-dimensional feature extraction on the first strain signal and the second strain signal to obtain first feature data and second feature data; performing multi-scale time sequence feature extraction on the first feature data to obtain time sequence feature data; performing spatial dimension feature mining on the second feature data to obtain feature mining data; performing fusion processing on the time sequence feature data and the feature mining data to obtain a fusion processing result; and performing surface collapse detection according to a fusion processing result to obtain a surface collapse detection result. According to the embodiment of the invention, the precursor information of the surface collapse can be more accurately captured.

The invention relates to a method for determining settlement and internal force of a stiffening core cement soil composite pile under the action of a vertical dynamic load of a pile top, and belongs to the technical field of bridge engineering. According to a cement soil radial reinforcement range, decomposing the calculation model into a cement soil reinforcement area and a cement soil non-reinforcement area, and determining a soil modal function, a characteristic equation and a characteristic root related to depth in different areas; a pile infinitesimal body settlement control equation is established and solved, and a soil settlement expression is obtained; determining the soil resistance per unit length of the stiffening core and the pile periphery interface; obtaining a stiffness core settlement and axial strain expression based on the stiffness core infinitesimal body settlement control equation; solving unknown coefficients in the stiffness core settlement and axial strain expression; and under the condition of different cement soil reinforcement ranges, a depth change diagram of settlement and axial strain of the stiffening core cement soil composite pile and a pile top vertical rigidity frequency spectrum response diagram are drawn. According to the method, the stiffness, settlement and axial strain spectrum response rules of the pile top of the stiffening core cement soil composite pile under the action of the vertical dynamic load of the pile top can be better reflected.

The invention relates to the technical field of nickel alloy pipe water pressure detection, and discloses a thin-wall nickel alloy pipe inner wall water pressure test detection system and method. The method comprises the steps that a closed water pressure environment is established in a pipe, a preset pressure gradient is applied, and pipe wall deformation response data are collected through a distributed sensing array; and generating a composite feature matrix containing axial strain, circumferential stress and radial displacement features through multi-dimensional feature extraction, inputting the composite feature matrix into a material performance degradation evaluation model, and simulating microstructure change to output a potential defect distribution map. Dynamically adjusting the water pressure gradient and the pressure maintaining time according to the map, executing a secondary water pressure test, and capturing a microscopic deformation sequence image through high-frequency imaging; comparing the image with a model prediction result identification deviation value, and iteratively updating a model parameter to optimize a detection threshold value; the test is completed by optimizing the threshold value, qualified pipe section marks and defective pipe section positioning coordinates are output, and the comprehensiveness and accuracy of thin-wall nickel alloy pipe inner wall defect detection are improved.

The invention relates to the technical field of geotechnical engineering and geomechanics, in particular to a round gravel soil constitutive model construction method and system. The method comprises the following steps: performing a triaxial consolidation drainage experiment on round gravel soil to obtain mechanical test data of the round gravel soil; according to the mechanical test data, the Duncan-Chang model is improved; and based on the improved Duncan-Chang model, constructing a roundstone soil constitutive model. According to the method, by improving the curvilinear relation between the axial strain and the lateral strain of the Duncan-Chang model, the volume strain and the tangent Poisson's ratio, the applicability of the Duncan-Chang model to the round gravel soil is improved, and the problem that under the combined action of mountainous area alluviation and lacustrine facies deposition on the rushing-lacustrine round gravel soil, the model is difficult to deform is solved. The problem that an existing constitutive model cannot accurately describe the mechanical behavior of round gravel soil is solved.

The invention provides a steel truss arch bridge suspender fatigue damage engineering evaluation method considering a bending effect, which comprises the following steps: firstly, distinguishing load working conditions according to a lane where a train is located and the number of carriages, comprehensively considering the influence of the bending effect, and simplifying the evaluation method by analyzing the influence degree of the transverse position of the train on suspender fatigue damage; then, axial strain epsilon < axial > and bending strain epsilon < bending > data of the shortest suspender under various working conditions are extracted and checked with health monitoring data, the influence of train bending behaviors, lanes where the train is located and the number of carriages on fatigue damage of the shortest suspender is determined, and the fatigue damage of the shortest suspender is determined based on a finite element model; evaluating fatigue damage of all suspenders of the full bridge under various load conditions when the bending effect is considered; finally, according to the accumulated fatigue damage rate, the fatigue damage grade and the maintenance period of the suspender are proposed, the fatigue performance of the steel truss arch bridge suspender is evaluated based on health data and numerical simulation, and a reference basis is provided for daily maintenance of the rigid suspender of the bridge.

The invention discloses a construction method of a water-containing rock damage statistical constitutive model considering compaction deformation, which comprises the following steps: carrying out a uniaxial compression test on a rock sample to obtain an axial stress-axial strain curve and a demarcation point in a compaction stage and a linear elasticity stage in the axial stress-axial strain curve; a sigmoid function is introduced, and the constitutive relation of the water-containing rock in the microfracture compaction stage is constructed; acquiring a damage variable after coupling of rainfall damage and stress damage caused by rock moisture infiltration; based on a damage statistical theory, constructing a constitutive relationship between a linear elasticity stage and a damage softening stage after a microfracture compaction stage of the water-containing rock; and constructing a damage statistical constitutive model of the water-containing rock considering compaction deformation. The constitutive curve corresponding to the constitutive model well reflects the compaction characteristic, the elastic characteristic, the damage softening characteristic and other deformation characteristics of the rock mass, and high prediction precision and practical application value are shown.

The invention provides a calculation method for the elastic modulus of a soil-rock mixture based on a mesoscopic structure model, relevant to the field of meso-numerical simulation of geotechnical materials. It includes the following steps: obtaining the gradation curve of soil-rock mixture particles through a screening test and constructing a two-dimensional random meso-structure model of the mixture with varying stone contents. Using the finite element method, a biaxial compression numerical test is conducted on the model under different stone contents and confining pressures. The equivalent elastic modulus of the mixture is determined by the corresponding secant elastic modulus at an axial strain of 1%. This macro-equivalent elastic modulus, considering stone content and confining pressure, is then fitted. This method effectively addresses the challenge of presenting accurate physical and mechanical parameters in engineering design and construction, making it directly applicable to practical engineering involving soil-rock mixture materials.

The utility model discloses a novel three-dimensional force sensor, which comprises an elastic sensor main body with a cylindrical structure, the upper part of the elastic sensor main body is provided with a first annular groove, the lower part of the elastic sensor main body is provided with a second annular groove, and four mounting positions are arranged in the second annular groove; an axial strain gauge is attached to the first annular groove, and three of the four installation positions are each provided with a transverse strain gauge. Thus, axial pressure information is received through the axial strain gauge in the first annular groove, transverse pressure information is received through the three transverse strain gauges, and the application scene of the sensor is improved.

The invention belongs to the field of superconducting material measurement, and discloses an external field critical current test sample rod under axial strain of a superconducting tape, which comprises a mechanical transmission device, a worm vertical to a left-right rotation trapezoidal screw rod, and a worm gear connected with the middle part of the left-right rotation trapezoidal screw rod through an optical axis key; the axial strain loading platform and the nut seat are respectively screwed into a left thread part and a right thread part of the left-handed and right-handed trapezoidal screw rod, the sample holder is supported and fixed through convex parts at two sides of the nut seat, the copper current terminals are respectively fixed at two ends of a platform part of the sample holder, and the strain gauge is used for being fixed on a middle shaft in the middle of a superconducting tape to be tested; and the electric signal transmission device is electrically connected with the strain gauge. According to the invention, the left-handed and right-handed trapezoidal screw rods are driven to rotate, so that the pair of nut seats with opposite threads are linearly opened and closed, the superconducting tape to be measured on the sample holder tape welding platform is driven to generate axial strain, and the critical current of the superconducting tape under the axial strain in a background magnetic field is measured.

The invention discloses a deformation monitoring system for a vertical supporting body of a foundation pit in a hydraulic reclamation area, which relates to the technical field of deformation monitoring and comprises a multi-source signal acquisition module, a dynamic environment acquisition module, a fusion identification module, a dynamic analysis module and a dynamic early warning module. Millisecond-level deformation signal capture is achieved, five key parameters including axial strain, lateral displacement, soil pressure, pore water pressure and water level are synchronously collected, the blind area problem of single-index monitoring is solved, the safety coefficient K is corrected by calculating a comprehensive deformation value Q and then introducing a pore water pressure change rate U3 and a water level change rate W3, the data fusion efficiency is improved, and the data fusion precision is improved. The problem of data islands is solved, multi-stage response is triggered according to the K value, regulation and control equipment and personnel evacuation are linked, the early warning response efficiency is improved, and the engineering defense value of the deformation monitoring system under the complex working condition of the hydraulic reclamation area is improved.

This application relates to the field of automotive fuel injector forging technology, and particularly to a forging method and equipment for automotive fuel injector forgings. The method includes: acquiring metal flow resistance, metal flow velocity, forging vibration data, and lateral force; determining a target flow velocity based on the metal flow resistance, metal flow velocity, and forging vibration data; determining axial strain coefficient and radial strain coefficient based on the metal flow resistance, metal flow velocity, forging vibration data, and lateral force; generating a slider control command based on the axial strain coefficient and the target flow velocity, and generating a push rod control command based on the radial strain coefficient; and controlling a forging device and a hydraulic device to forge the automotive fuel injector forging according to the slider control command and the push rod control command, respectively. This method can significantly improve the forging accuracy, production efficiency, and the level of intelligence and automation in the forging process.

The invention provides a rock strain softening constitutive model construction method, and relates to the field of rock mechanics, the method comprises the following steps: determining an actually measured rock axial stress-axial strain curve to be fitted; dividing a post-peak strain softening curve of the axial stress-axial strain curve of the rock into j sections according to engineering requirements; the axial stress and the axial strain of the peak intensity are recorded as the sum, and the axial stress and the axial strain at the right end point of each segment divided into the j segments are recorded as the sum; calculating to obtain axial cumulative plastic strain corresponding to each point; calculating cohesion corresponding to each point; and importing the axial cumulative plastic strain corresponding to each point and the cohesive force corresponding to each point into FLAC3D software in a table form to complete the construction of the rock strain softening constitutive model. According to the method, the problems that a conventional strain softening model is complex in parameter, poor in fitting with an actual test result and difficult to construct in numerical software are solved to a certain extent.

The present application relates to the field of testing and numerical analysis control technology, and in particular to a simulation method, apparatus, equipment, medium, and program for a true triaxial test. The method comprises: obtaining a test target for the true triaxial test; determining a specimen based on the test target and applying a preset axial strain increment to the specimen; collecting the true axial stress value, the true longitudinal stress value, the true transverse stress value, and the axial strain of the specimen; identifying a stress control target and a drainage control target within the test target, calculating a transverse stress target based on the true longitudinal stress value and the true axial stress value, generating a strain control matrix based on the stress control target, the drainage control target, the true axial stress value, the true longitudinal stress value, and the axial strain; and controlling the specimen to apply strain increments in three directions based on the strain control matrix to obtain simulation results of the true triaxial test. This method solves the problem in related arts that the simulation model for true triaxial testing cannot meet the requirements of various drainage conditions, resulting in low applicability and practicality.

The invention discloses an arch bridge arch rib erection construction deflection monitoring method, which comprises the following steps that S1, an arch bridge arch rib is spliced, the arch bridge arch rib comprises two upper chords and two lower chords which are respectively distributed up and down, the upper chords and the lower chords are respectively provided with a plurality of distributed strain optical fibers, and two adjacent distributed strain optical fibers are connected to form a plurality of distributed strain optical fibers; connecting all the distributed strain optical fibers to form a path; s2, acquiring strain and temperature data of the distributed optical fiber online in real time; s3, temperature compensation axial strain and neutral axis axial strain are obtained through calculation according to the collected strain and temperature data, and the deflection of the arch rib is obtained through calculation. According to the method, the deflection of the arch rib in the erection construction stage can be monitored in real time, construction does not need to be interrupted, and the method can be applied to the whole construction process; multiple parameters such as deflection, strain and temperature can be measured at the same time; the system can run and cover full life cycle monitoring of the arch rib, and can be converted into structure health monitoring after construction is completed.

The invention relates to the technical field of combined machining, in particular to a special-shaped ring rolling process method for tooth blank die forging forming, which comprises the following steps: circularly adjusting the rotating speed of a main roller and the feeding speed of a core roller of a ring rolling device in real time according to the actual rotating angle of an annular blank, and correcting the eccentric degree of the annular blank; reflecting the matching condition of the radial strain rate and the axial strain rate according to the change of the convex part of the annular blank, adjusting a correction parameter for correcting the eccentricity degree of the annular blank, and adjusting the holding roller compression rate of the rolling ring device to make up the change of the length of the convex part; estimating the required torque of the main roller and the maximum static friction, and judging whether the eccentricity of the corrected annular blank can cause the required torque of the main roller to exceed the limit or not; when the required torque of the main roller exceeds the limit, the adjusting amplitude of the rotating speed of the main roller and the feeding speed of the core roller is reduced, and the judgment standard for judging whether the eccentricity degree of the annular blank can be corrected or not is called back. The forming uniformity of the non-standard annular special-shaped tooth blank is improved by combining die forging with ring rolling.

The application relates to a kind of high strain rate under fiber concrete material dynamic axial tensile performance test method, comprising: setting Hopkinson tensile rod device, using the verified Hopkinson tensile rod device to pulse wave is applied to test piece, and the deformation of resistance strain gauge is collected;The deformation is converted into voltage signal, for calculating the strain of resistance strain gauge and the average compressive stress of test piece;Based on strain and average compressive stress, determine the dynamic tensile stress-strain relationship of test piece, according to the dynamic tensile stress-strain relationship of test piece, the dynamic tensile stress time history and dynamic axial strain time history are point by point corresponding pairing on time axis, and the dynamic tensile stress-strain curve of test piece under high strain rate is obtained.The application can make the performance test of fiber concrete and other materials under high strain rate more easily realized, provide the basis for the dynamic performance characterization of material, help the application and popularization of high-performance materials under extreme working conditions such as explosion impact.

The present invention discloses a pipeline leakage prediction method and system, belonging to the technical field of pipeline leakage monitoring. The present invention predicts leakage for buried pipelines that have not yet leaked. By establishing a corresponding relationship between the depth of the corrosion pit and the axial strain of the pipeline outer wall, and with the monitoring cooperation of an optical fiber measurement system, the present invention can effectively predict the leakage location and the time when a leak will occur in the buried pipeline that has not yet leaked, thereby preventing problems before they occur, eliminating the need to wait until the pipeline leaks before taking measures, greatly reducing the risk of explosions and the like caused by pipeline leakage, and facilitating its application in pipeline transportation in the fields of oil and natural gas.

The present invention provides a state monitoring method for an ultra-high pressure cylinder, comprising monitoring the ultra-high pressure cylinder through finite strain monitoring, temperature monitoring, key phase monitoring and plunger strain test calibration; polishing the symmetrical outer surface of a pipeline near the inlet and exhaust ports of the ultra-high pressure cylinder and pasting a temperature self-compensating strain gauge to test the axial strain and axial strain of the pipeline respectively; pasting a resistive temperature sensor near the strain gauge to test the temperature change of the inlet and exhaust pipelines, calculating the increased axial strain of the pipeline after the pipeline is heated and expanded according to the temperature change of the inlet and exhaust pipelines and the equivalent material linear expansion coefficient of the ultra-high pressure pipeline, thereby obtaining the pressure change in the inlet and exhaust pipelines; pasting a temperature self-compensating strain gauge on the symmetrical outer surface of the plunger tail end to test the axial strain of the plunger when the ultra-high pressure cylinder is working; accurately identifying the PV diagram of the working process of the ultra-high pressure cylinder, and realizing online monitoring of the ultra-high pressure compressor.