48 results about "Stress variation" patented technology

The invention provides a mass flow meter measurement compensation method and system combined with pipeline stress perception, and relates to the technical field of instrument correction. The method comprises the steps that an original stress data set is obtained; constructing a stress characteristic parameter set; constructing a sensor parameter set; based on the stress characteristic parameter set and the sensor parameter set, calculating the stress variation of the pipeline in the axial direction, the radial direction and the torsion direction to obtain a stress variation data set; utilizing the stress change data set and the sensor parameter set to establish a coupling model of the pipeline stress change to the vibration frequency and the phase signal of the sensing pipe, and calculating a corrected mass flow value; according to the comparison result of the corrected mass flow value and the calibration point in the long-term operation process, a parameter optimization algorithm is applied to conduct self-adaptive adjustment on the coupling coefficient, and coupling model optimization is achieved. The technical problem of measurement deviation caused by external stress, structural deformation and dynamic load in the prior art is solved.

The invention relates to the technical field of bridge engineering, in particular to a bridge creep deformation prediction and control method, which comprises the following steps: establishing a bridge structure finite element model; determining key section positions of the upper and lower edges of the bridge structure, and installing stress test elements at the key section positions; monitoring and recording the stress change of the upper and lower edges of the key section position in real time in the construction process; parameters in the finite element model are adjusted according to actually measured stress data, so that the error between the stress difference between the upper edge and the lower edge of the finite element model and an actually measured value is controlled within 1.0 MPa; generating a prediction result by using the corrected finite element model, wherein the prediction result comprises the creep deformation amount and the creep deformation direction of the bridge structure in the later period; and reserving a fastener adjustment space according to a prediction result. The scheme is used for solving the defect that in the prior art, the later creep deformation of a large-span beam arch bridge is difficult to accurately predict, and high-precision prediction of the later creep deformation of a bridge structure and dynamic parameter optimization and adjustment in the construction stage are achieved.

The invention discloses an elastic reverse time migration imaging method based on deviatoric stress characterization, and relates to the technical field of exploration geophysics. Deviatoric stress is introduced into a conventional elastic wave equation, and a speed-deviatoric stress elastic wave equation describing stress propagation characteristics is obtained through derivation; based on Hooke's law, P wave contribution in total partial strain is removed through partial strain decomposition, decoupling of P-S wave stress components is achieved, and correctness of amplitude, phase and physical unit of a decoupling wave field is guaranteed; and then a joint imaging condition with the average stress as a seismic source wave field and the multi-stress component as a receiving wave field is constructed, PP waves are subjected to normalization superposition through the average stress and the deviatoric stress, and PS waves are subjected to shear stress imaging. According to the method, the sensitivity to heterogeneity and local stress variation of underground media can be remarkably improved, P-S wave crosstalk and imaging noise are effectively eliminated, the imaging precision and resolution of a complex geologic structure are greatly improved, and a reliable technical means is provided for high-precision seismic exploration of complex oil and gas reservoirs.

A method of controlling stress variation in a layer including silicon oxycarbide formed using a capacitively coupled plasma enhanced chemical vapour deposition system. The method includes providing a chamber comprising a platen for supporting a substrate, placing a substrate, upon which a layer comprising silicon oxycarbide is formable, upon the platen, introducing a gas comprising oxygen into the chamber, introducing trimethylsilane gas into the chamber, generating a plasma within the chamber, maintaining a temperature at which deposition takes place to less than 275° C., maintaining a pressure within the chamber in the range 1.5-3 Torr, and depositing the layer upon the substrate with a deposition rate >1.5 μm / minute.

The present disclosure provides a kind of based on the method and device for evaluating the safety degree of power plant dust remover structure based on monitoring, by the load variation and stress variation of the middle column, side middle column and angle column of dust remover are monitored in real time, the stress response ability of each key structural component is calculated, to judge the health state of dust remover layer by layer.When the health early warning value is lower than the preset health threshold, the system will timely issue an early warning, help to identify structural abnormalities, so that maintenance personnel can make accurate decisions.The method realizes the accurate early warning and real-time monitoring of power plant dust remover, significantly improves the safety and operating efficiency of the equipment, and effectively guarantees the stable operation of power plant.

The present application relates to the technical field of structural mechanics analysis, in particular to a spreader saddle stress nephogram generation method and system, comprising the following steps: based on the spreader saddle regional cable segment force measurement and spatial geometric information, constructing the initial stress of the saddle body grid, obtaining the stress concentration rate distribution through homogenization and normalization, extracting the gradient mutation grid to form a sequence of demarcation points, and generating the saddle area nephogram in the HSV space mapping according to the non-uniform color scale. The present application can adaptively identify the area with the most severe stress change by introducing the analysis of stress concentration rate and its spatial gradient, and no longer relies on the fixed color scale division method, but uses the high gradient position as a dynamic anchor point to construct a non-uniform color scale sequence. The processing logic tilts the color scale resolution according to the real stress response of the structure, making the color transition in the stress concentration area more fine, and the stress peak and gradient form are clearly presented. At the same time, a wider color scale interval is used in the stress gentle area for general expression.

The application provides a pipeline stress-aware mass flowmeter measurement compensation method and system, relates to the technical field of instrument correction, and the method comprises the following steps: obtaining an original stress data set; constructing a stress characteristic parameter set; constructing a sensor parameter set; calculating stress change amounts of the pipeline in axial, radial and torsional directions based on the stress characteristic parameter set and the sensor parameter set, and obtaining a stress change data set; establishing a coupling model of pipeline stress change on sensor vibration frequency and phase signal by using the stress change data set and the sensor parameter set, and calculating a corrected mass flow value; and according to the comparison result of the corrected mass flow value and a calibration point in a long-term operation process, applying a parameter optimization algorithm to adaptively adjust the coupling coefficient, so that the coupling model is optimized. The technical problem of measurement deviation caused by external stress, structural deformation and dynamic load in the prior art is solved.

The present application relates to the technical field of structural stability analysis, and particularly relates to a support and hanger instability early warning method fusing stress and angle data, comprising the following steps: synchronously collecting real-time axial stress and spatial pitch angle of a support and hanger node to generate a time series data pair; calculating stress change rate and angle change rate; constructing a stress-angle deviation index; setting a dynamic threshold according to a real-time thermal displacement speed of a pipeline; when the stress-angle deviation index is greater than the dynamic threshold for a duration exceeding an early warning time window T, determining that the constraint is invalid and triggering early warning. Compared with a traditional monitoring method relying only on stress or displacement, the present application can effectively capture early coupling instability signs such as structural stiffness degradation, gap slip and thermal expansion constraint disorder, and realize high-sensitivity response to dynamic structural behavior.

1. Name of the product in this design: Drilling stress gauge (6-sided). 2. Purpose of this design: To measure stress changes in three directions within a borehole. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present application relates to the field of material science and engineering application technology, specifically to a kind of metal material thermal mechanical fatigue life fast prediction method based on hysteresis energy density.First, hysteresis curve is used to calculate hysteresis energy density, then the quantitative relationship between shape coefficient, stress variation range and plastic strain range between low cycle fatigue and thermal mechanical fatigue is used, to achieve the purpose of predicting thermal mechanical fatigue hysteresis energy density under the same mechanical strain amplitude by low cycle fatigue, finally, energy accumulation damage model is used to predict thermal mechanical fatigue life.The method carries out two groups of experiments for low cycle fatigue and thermal mechanical fatigue respectively, realizes the prediction of thermal mechanical fatigue life under different mechanical strain amplitudes by low cycle fatigue, establishes the correlation between low cycle fatigue and thermal mechanical fatigue by using the similarity between them in the process of cyclic loading, effectively reduces the experimental amount required for thermal mechanical fatigue life evaluation, and is applied to the thermal mechanical fatigue life prediction of high-temperature alloy and vermicular cast iron and other metal materials.

The application discloses a steel structure installation measurement method, which comprises the following steps: establishing and maintaining a hierarchical dynamic measurement reference system, wherein the system comprises at least one fixed first-level absolute reference and one second-level partition dynamic reference arranged on a body of an installed steel structure; arranging strain sensors at key positions of the steel structure to monitor stress changes of the components in the installation process in real time; taking the second-level partition dynamic reference as a reference, measuring the geometric pose of a component to be installed; meanwhile, comparing real-time stress data obtained in the second step with theoretical expected values; and coupling analysis is performed based on the geometric measurement result and the stress comparison result in the third step, including generating adjustment suggestions for the geometric pose of the component when the stress deviation exceeds an allowable threshold, so that the installation tends to be in a low-stress natural state; and the target pose of the component installation is a predicted installation shape obtained based on simulation analysis and calculation of a construction process, and the shape is an intermediate state of the structure after bearing subsequent loads and deforming to tend to a design shape.

The application relates to the field of traffic technology, in particular to a train modal optimization method. The train modal optimization method comprises the following steps: constructing a train coupling system total model based on structure parameters and operation parameters of a train; the train coupling system total model comprises a multi-body dynamics model for representing global vibration and a finite element coupling model for representing local stress variation; determining modal variables influencing each order modal according to the train coupling system total model; the modal variables refer to various influencing factors influencing the train modal; determining a modal optimization target and a modal lightweight constraint condition based on the maximum variable in the modal variables; performing topology optimization on a train structure topology based on the modal optimization target and the modal lightweight constraint condition to obtain an optimized modal variable; and optimizing the structure and material of the train based on the optimized modal variable. The train optimization modal optimization method can simultaneously reduce the weight and cost of the train.

The application relates to the technical field of material fatigue test, in particular to a structure fatigue testing machine. The structure fatigue testing machine comprises an operation table, the operation table is provided with symmetrically-distributed fixing frames, the fixing frames are slidably connected with symmetrically-distributed guide blocks, the guide blocks are rotatably connected with rotating shafts, the rotating shafts are fixedly connected with connecting plates, the connecting plates symmetrically and close to different fixing frames are fixedly connected with fixing shafts, the fixing shafts are fixedly connected with symmetrically-distributed T-shaped plates, the T-shaped plates are provided with equidistantly-distributed sliding grooves, the symmetrically and close sliding grooves of different fixing frames are jointly slidably connected with connecting pieces, and the connecting pieces are rotatably connected with symmetrically-distributed rollers. The position of the connecting piece on the adjacent sliding groove is adjusted, the bending degree of the two sides of the steel plate is continuously increased in the steel plate bending process, the connecting piece drives the roller to move to support and fix the multiple points of the steel plate, the stress of the two sides of the steel plate is uniform, and the accuracy of the stress change data of the middle part of the steel plate is ensured.

This invention relates to a method for expressing the physical properties of an elastic material when there is a change in strength in a plastic region. The method includes: a region setting step, wherein the region setting step defines a base region indicating the relationship between strain and stress in the first material and a variation region indicating the portion of stress change according to strain caused by factors induced by the pre-straining and heat treatment of the second material in a first material; and a simulation step, wherein the simulation step expresses the relationship between stress change and pre-strain in the variation region as a Boltzmann function, and derives the relationship between strain and stress in the second material as the sum of stresses according to strain in the base region and the variation region.

The invention relates to a stress testing device and method for a tool bit of a large seabed trencher, and aims to accurately simulate complex stress conditions, including resistances under different working conditions, of the tool bit of the large seabed trencher in actual seabed excavation in an equal proportion of 1: 1. The device comprises a wheel type frame structure, a tool bit installation mechanism and a test system, the wheel type frame structure is made of high-strength alloy steel, the tool bit installation mechanism can adjust the installation height and angle of a tool bit and simulate different excavation working conditions, and the test system is provided with a piezoelectric or strain type force sensor and a data acquisition system. The method is used for monitoring stress and moment data of the tool bit in the excavation process in real time. According to the method, the servo motor drives the frame to rotate, so that the tool bit performs circular trajectory motion, excavation is performed layer by layer, and the stress change rule of different depths is analyzed. Compared with the prior art, the method has the advantages that the defects of a reduced scale model test are overcome, more reliable and accurate data support is provided for tool bit design optimization, and the method has remarkable engineering significance.

The invention discloses an aero-engine blade vibration finishing surface pressure stress measurement method, and relates to the technical field of aero-engine manufacturing, and the method comprises the following steps: firstly, in a calibration stage, carrying out vibration finishing on a blade and an N-type Almen test piece together, and measuring the stress variation of the blade surface by using an X-ray diffraction method; arc height values of the test pieces are measured synchronously, and a linear regression model between the two is established through multiple groups of data; subsequently, in the application stage, the pressure stress value generated by the vibration finishing process on the blade surface can be quickly calculated through the model only by putting the test piece into a finishing machine for simulation processing and measuring the arc height value of the test piece, and the defects that a traditional X-ray diffraction method cannot be used on site and cannot independently measure the stress value of a single process are overcome; a convenient, efficient and low-cost measurement means is provided, and key data support is provided for optimizing vibration finishing process parameters and improving blade fatigue performance.

The application discloses a design method and system of a V-shaped built-in high-speed permanent magnet rotor containing multiple magnetic isolation bridges, and comprises the following steps: obtaining stress analytical relations of a central magnetic isolation bridge, an intermediate magnetic isolation bridge and two side magnetic isolation bridges according to structural characteristics of the magnetic isolation bridges, geometric characteristics of pole shoe regions, force balance equations of the magnetic isolation bridges, geometric coordination conditions, material physical equations and load forms; performing calculation and analysis based on the stress analytical relations to obtain design parameters of the intermediate magnetic isolation bridge and stress variation laws of the central magnetic isolation bridge, the intermediate magnetic isolation bridge and the two side magnetic isolation bridges; and determining optimal design parameters of the intermediate magnetic isolation bridge based on the stress variation laws. The five-magnetic-isolation-bridge V-shaped permanent magnet rotor is adopted, the width direction of the intermediate magnetic isolation bridge is perpendicular to the pole shoe surface of the rotor at the position of the intermediate magnetic isolation bridge, the mechanical strength of the permanent magnet rotor structure is remarkably improved, and the maximum operating speed of the permanent magnet rotor is further improved.

This invention discloses a simulation analysis method and system for disc brakes, relating to the field of disc brake simulation analysis technology. It solves the technical problem in existing technologies where simulation models lack a quantitative benchmarking and correction mechanism with bench test data, relying heavily on manual experience to adjust parameters. Specifically, the system uses a simulation analysis platform as its core, communicating between the simulation model construction unit and the stress distribution detection unit. Through 3D modeling, multibody dynamics simulation, flexible body coupling, and bench test benchmarking and correction, a high-fidelity brake dynamics simulation model is established. Based on this model, automatic performance determination is performed under multiple operating conditions, including emergency braking, continuous braking, and repeated braking. Furthermore, through finite element contact analysis and stress cloud map identification, accurate detection of stress concentration areas, stress variation patterns, and deformation risks in the brake disc is achieved, ultimately forming a closed-loop analysis system encompassing "modeling—simulation—verification—correction—stress analysis—operating condition classification—risk warning."

The utility model discloses steel structure welding stress detection equipment, and relates to the technical field of stress detection equipment. A first position adjusting mechanism is arranged on the front side of the fixing frame, a second position adjusting mechanism is arranged on the front side of the first position adjusting mechanism, and a detection abutting mechanism is arranged on the second position adjusting mechanism. The lower clamping plate and the fixing frame are connected through a limiting sliding rod and a clamping screw rod. Through cooperation of a first position adjusting mechanism and a second position adjusting mechanism, the position of the detection abutting mechanism can be conveniently adjusted, and through cooperation of a position fixing plate, a limiting groove, a movable plate, a locking screw and a locking plate, the detection abutting mechanism can be adjusted by a certain angle, so that the device can adapt to detection of different welding positions; an abutting spring is arranged in the detection abutting mechanism, detection scales are arranged on the outer side wall of the observation cylinder, a zero scale is arranged in the middle of the detection scales, the detection scales are located at the zero scale during use, stress changes of the steel structure in the left direction and the right direction can be adapted, and then stress detection is completed.

The present application relates to the technical field of stress monitoring, in particular to a kind of stress monitoring method and device for steel cable tensioning construction process.In the process of steel cable tensioning, the stress time series data of each monitoring position is obtained;Since stress data has delay, the local neighborhood of each monitoring position is determined, the difference characteristics of stress time series data between monitoring positions in neighborhood are analyzed, the stress change delay index is determined in combination with position distribution, and the stress transmission delay characteristics are accurately described;At the same time, the local influence is considered, the neighborhood influence index of each monitoring position at the current time is determined based on the numerical difference of stress change delay index and the change of stress time series data in neighborhood, and the degree of mutual influence is quantified;Considering the current stress state and local influence, the next time predicted stress value is determined according to the numerical characteristics of stress time series data of each monitoring position at the current time and neighborhood influence index, and then the monitoring of steel cable tensioning is realized, and the monitoring accuracy is improved.

This invention provides a safety detection method and system for the lifting process of a large-span welded spherical steel space frame, belonging to the field of engineering detection technology. The method includes: calculating the simulated deformation and stress values ​​of the large-span welded spherical steel space frame during the lifting process; setting up monitoring points on the large-span welded spherical steel space frame; if the on-site line of sight is greater than the preset line of sight, then using a total station to calculate the elevation values ​​of each monitoring point when the steel space frame is lifted to different heights; otherwise, using a distance measuring instrument to obtain the lifting height of all monitoring points of the steel space frame; calculating various deformation indices and determining whether each deformation indices exceed the corresponding deformation warning value; obtaining the stress change value by combining the strain value obtained by strain gauges with the elastic modulus of the steel material; when the stress change value exceeds the stress change warning value, then partially unloading the steel space frame; this invention comprehensively obtains overall safety performance information, improving the construction safety factor.

The present application relates to the technical field of tunnel and underground engineering, and discloses a jointed rock mass tunnel deformation and instability prediction method, medium and equipment, the prediction method comprising: based on the size of the to-be-tested tunnel and the deformation influence range of surrounding rock, a jointed rock mass tunnel multi-scale model comprising, from outside to inside, a continuous medium model area, a block discrete element model area and a bonded block model area is established; the jointed rock mass tunnel multi-scale model is used to perform step-by-step simulation of the construction steps of the to-be-tested tunnel according to the construction method and process of the actual project; and the jointed rock mass tunnel deformation and instability prediction results are obtained according to the displacement, deformation and stress change output at the specified monitoring points in the step-by-step simulation process.The present application realizes multi-scale analysis of macroscopic deformation, local damage and crack propagation of jointed rock mass through the hierarchical coupling of the continuous medium model, the block discrete element model and the bonded block model, and can truly reflect the mechanical response characteristics of rock mass under different scales.

This invention discloses a method for the overall hoisting construction of large-span spatial steel space frames using finite element analysis and BIM technology. This method first verifies the overall stress performance of the space frame through finite element analysis, determining the optimal hoisting points and wire rope parameters. Then, it uses BIM to assist in determining the ground assembly position of the space frame, selecting the appropriate crane type, determining the optimal crane hoisting position, and simulating the hoisting route to determine the optimal hoisting trajectory. By integrating a resistance strain monitoring system into the BIM software, the stress values ​​of each major load-bearing member of the space frame model during assembly and hoisting are directly displayed in the model. Corresponding stress thresholds are set according to specifications, allowing for intuitive monitoring of stress changes in each major load-bearing member. This ensures that any abnormalities are identified and their causes are determined immediately, enabling continuous monitoring throughout the entire space frame installation process and ensuring overall safety during hoisting.

The application provides a shot peening reinforced ship body welding joint fatigue life evaluation method and related equipment, and belongs to the technical field of structure fatigue life evaluation. The method comprises the following steps: obtaining an initial S-N curve corresponding to a target ship body welding joint before shot peening reinforcement; determining a fatigue performance influence coefficient introduced after shot peening reinforcement by analyzing fatigue performance data of sample welding joints before and after shot peening reinforcement, wherein the sample welding joints are welding joints with the same material and shape as the target ship body welding joint; correcting the initial S-N curve according to the fatigue performance influence coefficient to obtain a corrected S-N curve; and evaluating the fatigue life of the target ship body welding joint after shot peening reinforcement according to the equivalent structural stress variation range of the target ship body welding joint after shot peening reinforcement and the corrected S-N curve, thereby improving the precision of the fatigue life evaluation of the ship body welding joint after shot peening reinforcement.

The application discloses a kind of super magnetostrictive transducer dynamic stress measurement system and method.There is power supply circuit;Super magnetostrictive transducer, the power supply circuit is connected with the super magnetostrictive transducer, the super magnetostrictive transducer includes vibrator and shell, the vibrator is arranged in the shell, and the upper end and lower end of the vibrator are connected with the shell;Measuring rod, the upper end and lower end of the vibrator are equipped with the measuring rod, and are connected with the shell by the measuring rod;First diamagnetic field strain gauge, including two first resistance strain gauges and first insulating material film, two the first resistance strain gauges are respectively test piece A and test piece B, the test piece A is bonded with the measuring rod;Dynamic strain meter, the positive electrode line and negative electrode line of the first diamagnetic field strain gauge are respectively connected with the access channel of the dynamic strain meter.Effectively measure the actual stress variation inside super magnetostrictive transducer.

1. Name of the product in this design: Drilling stress gauge (6 sides). 2. Purpose of this design: To measure stress changes in three directions within a borehole. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present application relates to the technical field of metal heat treatment, and particularly relates to a heavy steel component stress relief heat treatment method, which comprises the following steps: stress distribution mapping and partitioning: initial residual stress mapping is performed on a large special-shaped heavy steel component to be processed, and the component is divided into multiple independently controllable heating zones according to stress distribution data obtained by mapping and geometric characteristics of the component; process parameter generation; partition heat treatment; closed-loop feedback control: in the partition heat treatment step, stress change data of at least part of the independently controllable heating zones are monitored in real time, and the dynamic process parameter set of the corresponding partition is dynamically adjusted online according to the stress change data, so as to realize self-adaptive regulation and control based on stress release effect. Through initial residual stress mapping of the large special-shaped heavy steel component and division of multiple independently controllable heating zones according to stress distribution and geometric characteristics of the component, a regional and customized heat treatment process is realized.

The invention relates to the technical field of wind power generation, and provides a steel strand tension stress monitoring method, device and equipment, and the method comprises the steps: obtaining an initial stress value of a target steel strand in a steel-concrete tower of a wind turbine generator; monitoring the magnetization intensity of the target steel strand, and determining the stress variation of the target steel strand based on the magnetization intensity; determining a current stress value of the target steel strand according to the initial stress value and the stress variation; and according to a comparison result of the current stress value and a preset stress threshold value, evaluating the health state of the target steel strand. According to the technical scheme provided by one or more embodiments, the tension stress of the steel strand can be monitored in real time, and the structural safety state of the steel strand and even a wind turbine generator system can be accurately evaluated.