2493 results about "Axial force" patented technology

The invention relates to the technical field of bolt tightening, and provides an intelligent bolt tightening control method and system based on axial force measurement. Comprising the steps of collecting bolt identification and process parameter data, collecting temperature measurement data, and obtaining sound velocity compensation parameters and elastic modulus compensation parameters. And zero-load preloading data are collected and processed to generate zero-load baseline data, and a self-calibration model is obtained. Axial force data and ultrasonic echo data are collected, and an axial force fusion estimation result is obtained. And comparing an axial force fusion estimation result with target axial force data. And when in the target interval, fine twisting control is carried out based on model predictive control and a micro-stepping strategy, and the controllable damping unit is driven to carry out energy absorption and stopping. And acquiring an axial force fusion estimation result when the target axial force is reached, processing the data in the holding stage to obtain an axial force rebound check result, and if the axial force rebound check result exceeds the limit, performing secondary twisting control. According to the scheme, refinement and traceability of the bolt tightening process are achieved.

The invention belongs to the technical field of supporting structure performance evaluation, and particularly discloses and provides an NT-CEP pile wall anchor foundation pit supporting structure anti-overturning evaluation method which comprises the steps that in the whole construction period, the construction process is divided into a plurality of continuous load steps based on excavation and supporting procedures; under each load step, pile body strain, arc-shaped wall stress, anchor rod axial force and deep soil displacement are synchronously collected, and a multi-source response data set is constructed; constructing an NT-CEP pile-arc wall-anchor rod coupling model based on the design drawing; carrying out inversion analysis through the model, and solving the load sharing proportion and the overall anti-overturning safety coefficient of each component under each load step; and continuously identifying the abnormal component based on the load sharing proportion, and dynamically analyzing and outputting an anti-overturning capability evaluation index based on the change trend of the safety coefficient. According to the method, dynamic refined evaluation of the construction process is realized, and the authenticity and perspectiveness of an evaluation result are remarkably improved.

The invention discloses a state transition pump shaft simulation load run-out detection system which comprises a pump, a dial indicator and a pull and push dynamometer. The pump shaft is provided with a driving disc and a stress disc, and the driving disc, the pump shaft and the stress disc are located on the same central axis. The dial indicator can be selectively configured in a radial run-out detection state by adjusting the position of the dial indicator and the direction of a measuring head, wherein the measuring head is perpendicular to the central axis and abuts against the outer circumferential surface of the pump shaft; in the axial run-out detection state, the measuring head is overlapped or parallel to the central axis and abuts against the axial end face of the pump shaft; the push-pull dynamometer can be selectively configured in a radial force application state by adjusting the position of the push-pull dynamometer and the direction of a force application end, wherein the force application end is perpendicular to the central axis and abuts against the outer circumferential surface of the stress disc, and a radial simulation load is applied; in the axial force application state, the force application end is parallel to the central axis and abuts against the disc end face of the stress disc, and an axial simulation load is applied. Through the state conversion of the same detection and force application device, the radial and axial runout integrated detection of the pump shaft under the simulated load is realized.

The invention relates to the technical field of aero-engines, in particular to a sealing and cooling structure and method for adjusting the axial force of an aero-engine rotor, which comprises a turbine disc provided with a rear baffle, and further comprises a low-pressure turbine guide vane arranged opposite to the turbine disc, a low guide front inner supporting ring and a low guide rear inner supporting ring are arranged in the middle of the low-pressure turbine guide vane; labyrinth teeth correspondingly matched with the low-guide front inner supporting plate are formed on the rear baffle, radial labyrinth tooth gaps are formed, and when airflow in an air collection cavity enters a rotor cavity from a low-pressure pre-rotation nozzle, the airflow is embedded into an air supply channel from a front pre-rotation hole at the same time; one part of airflow entering the air supply channel enters the disc rear cavity, and the other part of airflow enters the rotor cavity. By adjusting the sealing labyrinth structure, it is ensured that the axial force of the rotor does not exceed the allowable maximum value in the large-state working process and is not subjected to light load in the small-state working process, meanwhile, sealing gas used behind a turbine disc is ensured, turbine hot gas is prevented from flowing into an inner disc cavity from a main channel, and it is ensured that an engine works reliably.

The present invention provides a steel support system for foundation pit support, belonging to the field of foundation pit support, and is used to support the foundation pit in foundation pit engineering. Foundation pit construction is extremely likely to cause damage such as settlement of surrounding buildings and municipal pipelines, so there are very high requirements for construction quality and deformation control. In the prior art, the steel supports that can achieve axial force compensation have problems of high cost and weak structure. This steel support system includes a plurality of steel supports, and both ends of the steel supports are respectively connected to the foundation pit side through quick-installation and quick-disassembly structures. The steel support includes a flexible section and an adjustment section. Two flexible sections are respectively arranged at both ends of the steel support. The flexible section includes a flexible head and a fixed head that are slidably matched, and the adjustment section is arranged inside the steel support. With the cooperation of the sliding function of the flexible section and the telescopic function of the adjustment section, the overall length of the steel support can be adjusted. In the present invention, the entire steel support system only requires a set of servo adjustment mechanisms, having the effects of low cost and high reliability.

The invention discloses a surrounding rock deformation treatment method which comprises the following steps: determining the range of a strong influence area in a fault through advanced geological detection, and adopting a graded support strategy for different influence areas: when the width of the strong influence area in the fault is three times greater than the span of a tunnel, arranging an NPR anchor cable group on the ground surface to form a pre-reinforcement system; during benching, NPR anchor rods and steel arches are combined for supporting in a fault non-weak-influence area, and long and short NPR anchor cables are additionally arranged in a fault weak-medium-influence area for collaborative supporting; double-gradient grouting is implemented in front of the boundary of the moderately strong affected zone, a peripheral reinforcing shell is formed by grouting at the first gradient of 2-3 MPa, and an internal permeation network is formed by grouting at the second gradient of 3.5-4.5 MPa; through real-time monitoring of the axial force of the steel arch, a linkage response mechanism of anchor cable secondary tensioning and grouting and supplementing is established. According to the method, through combination of advanced pre-reinforcement, graded support and dynamic regulation, active control over tunnel surrounding rock deformation of the fault fracture zone is achieved, and the collapse risk and the support structure damage risk are effectively restrained.

Disclosed in the present invention are high-rise pile cap equipment under a horizontal load and a centrifuge test method for foundation bearing characteristics thereof. The equipment comprises a model box, a sand layer, a model pile cap, at least eight model piles, a horizontal loading device, at least two laser displacement sensors, an axial force sensor, and a plurality of strain gauges. The method comprises: S1, performing one-way horizontal loading on high-rise pile cap equipment under a horizontal load to obtain an ultimate foundation bearing capacity situation, a model pile body axial force distribution situation, a pile foundation axial force comparison situation, a model pile body bending moment distribution situation, and a model pile body bending moment comparison situation of the equipment; and S2, performing one-way variable amplitude cyclic loading on the high-rise pile cap equipment under the horizontal load to obtain a foundation displacement situation, an effect of the number of cycles on foundation stiffness, an effect of a cyclic load amplitude on the foundation stiffness, and a foundation inclination situation. In this way, the foundation design of the high-rise pile cap can be optimized, and a basis and a reference for evaluating safety of foundation long-term service are provided.

The invention relates to the technical field of petrochemical equipment sealing, in particular to a flange sealing performance evaluation method based on bolt axial stress, which comprises the following steps: establishing a nonlinear stress relationship between a gasket and bolt axial force; establishing a relationship between the axial stress of the bolt and the sealing contact stress of the contact surface of the gasket under different working pressures; constructing a three-dimensional model of a real sealing surface; establishing a three-dimensional model of the sealing surface contact process; obtaining the change of a leakage gap between the contact surfaces under different contact stresses, and establishing a relation model of the leakage gap of the contact interface and the sealing contact stress; establishing a quantitative evaluation model among the sealing contact stress, the leakage clearance and the leakage rate; obtaining the contact stress under the actual working condition, and calculating whether the corresponding leakage rate meets the tightness judgment standard or not so as to judge the sealing state of the flange. The invention aims to solve the technical problem that the metal sealing performance of in-service flange connection cannot be quantitatively and online evaluated in the prior art.

The invention discloses a quasi-static loading system for plane local loading and a loading method of the quasi-static loading system, and aims to solve the problem that a processing method for accurately simulating a complex stress state of a shear wall under an equipment anchoring effect does not exist at present. A bottom-arranged boundary fixing piece is arranged at the bottom of a counter-force portal, and an out-of-plane local load loading assembly is arranged on the top surface of the bottom-arranged boundary fixing piece; the vertical loading piece and the in-plane horizontal transverse loading assembly are arranged in the counter-force portal frame, a placing part matched with a test piece is formed between the bottom side of the loading beam and the top surface of the bottom boundary fixing piece, the two horizontal actuators are arranged at the two ends of the loading beam respectively, one end of each horizontal actuator is connected with the loading beam, and the other end of each horizontal actuator is connected with the in-plane horizontal transverse loading assembly. The other end of each horizontal actuator is arranged on the inner wall of the side part of the counter-force gantry; the quasi-static force loading method comprises the following steps: performing preset vertical axial force application, prestress tension grading and / or supplementary tension treatment on a test piece according to preset requirements, and then performing horizontal cyclic loading until the bearing capacity of the test piece is reduced to 85% of a peak load, and terminating the loading process.

The invention relates to a method for optimizing a newly-built anchor rod supporting system for slope expanding excavation by using residual anchor rods. The method comprises the following steps: preliminarily selecting a plurality of excavation schemes of different excavation slope angles according to the geometrical morphology of the side slope and the layout of anchor rods; calculating the excavation area and the residual length of the anchor rod of each scheme; calculating the theoretical ultimate uplift bearing capacity of the residual anchor rod based on the soil nail theory; midas GTS NX software is used for establishing a slope stability numerical simulation model considering and not considering the influence of residual anchor rod reinforcement, and a safety coefficient and anchor rod axial force distribution are calculated; by comparing the maximum axial force of the residual anchor rod obtained through numerical simulation calculation with the ultimate uplift bearing capacity obtained through theoretical calculation, the authenticity of the numerical simulation calculation safety coefficient is judged, and the true safety coefficient is sought; calculating a rock-soil body shear strength parameter adjustment coefficient according to the true safety coefficient to obtain an enhanced rock-soil body shear strength parameter, inputting the enhanced rock-soil body shear strength parameter into geotechnical engineering design software, and designing a newly-built support structure; and finally, technical and economic comparison and selection are carried out on the schemes, and the optimal scheme is selected.

The invention relates to the technical field of multi-stage pumps, and particularly discloses a multi-stage pump axial force balancing system which comprises a water inlet section, a water outlet section and a water outlet section. The water outlet section is provided with a pressure relief cavity; two ends of the balance pipe are respectively communicated with the water inlet section and the pressure relief cavity; the two ends of the middle section are communicated with the water inlet section and the water outlet section respectively, an impeller is arranged on the inner wall of the middle section in a matched mode, a flow blocking cavity and a cover plate cavity are formed in the two sides of the impeller, and when the impeller rotates, hydraulic pressure generated by media in the flow blocking cavity to the impeller and hydraulic pressure generated by media in the cover plate cavity to the impeller are balanced; a balancing drum mounted on the pump shaft; the balance rings are mounted on the water outlet section, and the outer wall of the balance drum is sleeved with the balance rings at intervals; wherein the impellers comprise a plurality of first impellers and a plurality of second impellers, and the cover plate cavity corresponding to the second impellers is communicated with the pressure relief cavity through a gap between the balancing drum and the balancing ring. According to the axial force balancing system of the multi-stage pump, the balancing effect of axial force can be improved, and it is ensured that the multi-stage pump runs safely.

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 relates to the technical field of multi-stage centrifugal pumps, and discloses an axial balance assembly which comprises a balance shaft sleeve, a pump shaft and a high-pressure throttling ring connected to a water inlet and outlet section, the balance shaft sleeve is connected to the pump shaft and arranged on the periphery of the pump shaft in a sleeving mode, and the high-pressure throttling ring is arranged on the periphery of the balance shaft sleeve in a sleeving mode. The high-pressure throttling ring and the periphery of the balance shaft sleeve are limited to form a flow blocking cavity, the flow blocking cavity is provided with a high-pressure flow blocking inlet and a high-pressure flow blocking outlet, the high-pressure flow blocking inlet and the high-pressure flow blocking outlet are oppositely arranged at the two ends of the flow blocking cavity in the axial direction of the balance shaft sleeve, and the high-pressure throttling ring is provided with a high-pressure ring end face. The balance shaft sleeve is provided with a high-pressure shaft end face, and the high-pressure choke flow inlet is located between the high-pressure ring end face and the high-pressure shaft end face. According to the axial balance assembly, generation of residual axial force from the high-pressure section to the low-pressure section is reduced, the service life of the water pump is prolonged, and the operation reliability of the water pump is improved.

The invention discloses an axial force measuring device and an axial force measuring method.The axial force measuring device is arranged in a bearing seat and located between an axial limiting structure of the bearing seat and a bearing outer ring, the axial force measuring device comprises a first force measuring ring and a second force measuring ring, and the second force measuring ring is sleeved with the first force measuring ring; in the assembled state, the stress end of the second force measuring ring and the stress end of the first force measuring ring have a preset axial dimension difference so that the first force measuring ring can bear the axial force when the axial force is smaller than a preset value. And the first force measuring ring is also used for axially deforming to be matched with the axial size of the second force measuring ring after the axial force is greater than a preset value, so that the first force measuring ring and the second force measuring ring bear the axial force together.

The invention provides a bridge design method and system based on pushing displacement and rigidity inversion, and belongs to the technical field of bridge design. A theoretical formula among the axial force of each span of steel box girder, the displacement of each pier and the anti-pushing rigidity of the piers under the condition of system temperature change after each pushing in the walking pushing construction process is deduced, and actual monitoring data of the beam length change of the steel box girder in the walking pushing construction process are combined; numerical analysis software is used for carrying out inversion analysis on the anti-thrust stiffness of each pier, the curve trend of the anti-thrust stiffness changing along with the temperature difference under the theoretical condition is obtained, the theoretical analysis of the influence of the system temperature effect on the longitudinal bridge direction in the walking incremental launching construction process is perfected, and data support is provided for implementation of measures such as pier stiffness adjustment and displacement release in the follow-up process; by calculating the sparse parameters of the missing data, the adaptability to unbalanced data and the data noise redundancy are higher, and the method is suitable for missing data supplementation in the field of bridge design which is susceptible to natural factors.

The invention relates to the technical field of foundation pit supports, in particular to a repeatable assembly type steel support for foundation pit construction, which comprises an extension steel support, a butt joint steel support, a main steel support, an axial force supplement steel support, two jacks and two steel enclosing purlins, the butt joint steel support is fixedly connected with the main steel support, and the axial force supplement steel support is slidably connected with the inner wall of the main steel support; the two ends of the axial force supplementing steel support and the two ends of the extension steel support are fixedly connected with the jacks respectively. The quick dismounting and mounting mechanism is arranged to be linked with the anti-deformation mechanism, the axis of the extension steel support is limited, and the situation that when the axial force is insufficient, the joint of the extension steel support and the butt joint steel support collapses due to the gravity effect is prevented. Meanwhile, the gravity direction of the steel support is changed through a fixing plate on the gravity compensation axial force mechanism, the gravity of the steel support acts on a hinged plate downwards all the time, then a sliding plate and the axial force compensation steel support are driven to abut against the foundation pit, the installation time is shortened through the design, and the self-weight influence of the steel support is effectively controlled.

The invention provides a test device and a test method for loading a three-dimensional conical fatigue load. The device comprises a bearing beam frame assembly, a sliding rod supporting assembly, a displacement coordination loading system, an axial force loading system, a stay cable simulation test piece and a stay cable simulation fixing tool, by analyzing the working states of flexible connecting structural members such as inhaul cables and mooring ropes, the invention provides a new fatigue loading form, and the loaded axial force is always in the axial direction of the structural members and can rotate in the space; the loading form can truly reflect the'pull-pull 'fatigue life of the structural member in a specific working environment, and is used for guiding maintenance and repair of key equipment.

The invention belongs to the technical field of wind driven generator main bearing test equipment, and discloses a five-degree-of-freedom wind driven generator main bearing test bench for simulating real working conditions, which comprises a loading system, a test system and a driving system. The loading system adopts a sliding bearing loading disc to simulate a hub of the wind driven generator, and adopts a hydraulic cylinder array to simulate five-degree-of-freedom hub loads of three-direction forces including axial force, radial force and vertical force and two-direction moments including pitching moment and yawing moment. The test system adopts a two-point supported tapered roller bearing main shaft system to simulate the main shaft configuration of the wind driven generator, and can be independently disassembled to replace the model of a test bearing. The driving system adopts a variable-frequency and variable-speed motor, the rotating speed range is 0-200 rpm, and the requirements of various working conditions such as frequent start and stop, performance tests and strengthening tests can be met. According to the invention, through multi-dimensional load loading and multi-working-condition simulation, a key platform is provided for reliability test and failure mechanism research of the wind power main bearing.

The invention discloses a strike-slip fault buried pipeline test loading device capable of considering soil body action, and belongs to the technical field of geotechnical engineering tests. The device comprises a double-shaft loading system, a fixing device, a pipeline system and an axial force and bending moment combined loading system, the device is specifically divided into a three-dimensional adjustable reaction frame, an axial servo actuator, a radial servo actuator, a distribution cross beam with a movable hinged support, a pipe hoop restraint device, a pipeline test piece, an adjustable arc-shaped supporting cushion block, a flange type end plate, a movable hinged support and an adjustable spring set. And meanwhile, a loading curve of the axial force and the bending load of the pipeline under strike-slip fault dislocation is established. And the axial servo actuator and the radial servo actuator carry out four-point bending loading on the pipeline according to the established load applying curve of the axial force and the bending moment. According to the test device and the loading system, the stress state of the oil and gas pipeline under strike-slip fault dislocation can be reproduced, and the failure mode and deformation characteristics of the pipeline without soil constraint under axial force and bending moment loads are disclosed.

The invention discloses a bolt axial force measurement method based on trailing waves and temperature compensation, and relates to the technical field of bolt axial force measurement. The influence of stress and temperature on the bolt length and ultrasonic sound velocity is analyzed, sound time variation of longitudinal waves and primary trailing waves under the action of stress and temperature is obtained, the longitudinal waves and the primary trailing waves are selected to serve as a wave type combination of bolt axial force measurement based on sensitivity analysis of sound waves on stress and temperature, and a sound elasticity principle is combined to measure the bolt axial force. Establishing a relation model of ultrasonic sound velocity, stress and temperature, and respectively calculating longitudinal wave sound time and primary trailing wave sound time considering the comprehensive influence of the stress and the temperature; and constructing a measurement characterization quantity of the bolt axial force based on longitudinal wave and primary trailing wave sound time, and performing temperature compensation on axial stress measurement to complete bolt axial force measurement. The axial force characterization quantity is constructed by measuring the sound time difference by utilizing the propagation information of the longitudinal wave and the primary trailing wave, and the axial force measurement requirement of the fastened bolt in the high-temperature environment is met.

The utility model relates to a tensioning device for a building block type screw. The tensioning device comprises a stretching piece, a pressing piece, a telescopic piece and a driving piece. The stretching piece is used for being connected with a locking piece of the building block type screw. The pressing piece is used for being connected with a thread element of the building block type screw. One end of the telescopic piece is connected with the stretching piece, and the other end of the telescopic piece is connected with the pressing piece; the driving part is connected with the telescopic part and used for driving the telescopic part to do telescopic motion. Compared with the prior art, the tensioning piece and the pressing piece only transmit axial force to the shaft core and the thread element, so that the transmission efficiency of the tensioning force is high, and compared with a radial screwing mode of a traditional torque wrench, radial load is not borne between the shaft core and the thread element, and the torque wrench is simple in structure and convenient to use. The problem that the friction coefficient is increased due to torsional deformation of the thread element and the shaft core spline is solved.

The invention discloses a B-axis power knife rest comprehensive performance test bench and method. The B-axis power knife rest comprehensive performance test bench comprises a base, a B-axis power knife rest, a simulation knife handle assembly, a knife rest mounting seat, an axial displacement table, a dynamometer assembly, an axial force loading assembly, a radial force loading assembly, a deformation measurement assembly, a temperature measurement assembly, a control system and a data acquisition system. The B-axis power tool rest is fixedly connected to the base through the tool rest installation base, the simulation tool handle is installed on the B-axis power tool rest, the axial displacement table is installed on the base, the power measuring assembly and the axial force loading assembly are coaxially combined and installed and then fixedly connected to an axial displacement table moving plate, and the radial force loading assembly and the deformation measuring assembly are installed on an axial displacement table fixing plate. The testing device is simple and compact in structure, large in loading force range and capable of supporting performance testing of B-axis power tool rests of various models, various stations and under multi-dimensional force loading; the test method is simple.

The invention discloses a spherical roller bearing entity simulation method, device and equipment and a medium, and relates to the technical field of wind power generation. According to the scheme, when the finite element mesh model of the spherical roller bearing is constructed, the rollers are connected to the bearing inner ring and the bearing outer ring through the spring units, that is, traditional finite element constraint is replaced with the mode that the rollers are constrained through the spring units, and the conventional constraint limitation in finite element simulation is broken through; accurate analysis of bearing roller contact in a complete machine model is realized; after a complete machine finite element mesh model is generated based on a model of the spherical roller bearing, simulation parameters and loading parameters of the complete machine finite element mesh model are set, the simulation parameters at least comprise a working clearance between a roller and a raceway, that is, contact offset is added to simulate the existence of the radial clearance of the bearing, and the loading parameters of the complete machine finite element mesh model are set. The problem of simulation of play contact of the SRB main bearing under the working condition of high axial force is solved, and three-dimensional balance of physical authenticity, calculation efficiency and engineering applicability is achieved.

The invention relates to the technical field of composite pipe manufacturing, in particular to a steel wire mesh pipe framework automatic braiding device which comprises a first winding assembly, a second winding assembly, a transmission assembly, a driving assembly and a rack, a through hole is formed in the rack, the first winding assembly and the second winding assembly are both rotationally connected with the rack, and the transmission assembly and the driving assembly are arranged on the rack. The through hole, the first winding assembly and the second winding assembly are coaxially arranged; the transmission assembly and the driving assembly are both fixed to the rack, the transmission assembly is connected among the first winding assembly, the second winding assembly and the driving assembly, and the rotation direction of the first winding assembly is opposite to that of the second winding assembly. According to the invention, forward and reverse steel wire winding can be simultaneously carried out, and adjacent forward and reverse rotating steel wires are mutually restricted at the overlapping point, so that the steel wires are effectively prevented from sliding in the axial direction of the pipe when being axially stressed, and the uniformity and the structural stability of a steel wire mesh framework grid are remarkably improved.

The invention discloses a novel internally-inserted water-cooled magnet container assembly for a hybrid magnet with high mechanical stability, which comprises an upper cylinder component, a container end cover, a hydraulic machine component, a central tube component, an inner support component, a middle cylinder component, a lower cylinder component, an electric connection component and a first conductive flexible connector, and a magnet coil assembly comprises a plurality of radially-sleeved coils; the hydraulic machine assembly comprises a cylinder body, a piston, a check ring, a pressure equalizing pad, a limiting block, a first force transmission check ring, a first anti-rotation pin, a second force transmission check ring, a second anti-rotation pin, a first force transmission column and a second force transmission column. The device has the advantages that axial force application can be performed on the magnet coil assembly, the pressing force on the magnet coil assembly is increased, the problems of tension fracture and damage caused by coil stress overrun due to overlarge radial expansion electromagnetic force of a magnet coil bit piece and an insulating piece are solved, the dismounting and maintenance process of the mixed internally-inserted water-cooled magnet device is simple and rapid, and the efficiency is high. And the dismounting efficiency is improved.

The invention belongs to the technical field of engineering protection and treatment, and discloses an anchoring structure internal force calculation method for an internal anchoring type anchor rod, and the method comprises the steps: building a first shear stress coupling relation between axial displacement and an anchor rod mortar interface according to the stress balance condition, axial stress and axial displacement of the anchor rod; presetting a load transfer mode from an anchor rod to a mortar body to a surrounding rock body in the anchoring structure based on the shear hysteresis model, and constructing a second shear stress coupling relationship between the axial displacement and the shear stress of the anchor rod mortar interface and the shear stress of the mortar surrounding rock interface according to the load transfer mode; based on the first shear stress coupling relation, the second shear stress coupling relation and stress boundary conditions of the anchoring structure, an anchor rod axial force analytical equation and an internal shear stress analytical equation set of the anchoring structure are constructed; and calculating the axial force and the internal shear stress of the anchor rod of the anchoring structure according to the physical parameters and the construction parameters of the anchoring structure. According to the invention, the transmission analysis of the drawing load in the anchoring structure is realized, and the displacement axial force and interface shear stress distribution of the internal anchoring type anchor rod can be calculated.

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 utility model provides a steel support servo supporting system capable of intelligently controlling inner support axial force and deformation, which comprises a building envelope, a plurality of layers of bidirectional #-shaped steel supports are fixed on the inner side of the building envelope at intervals, and steel support axial force servo devices are arranged in the bidirectional #-shaped steel supports. The steel support axial force servo device is used for adjusting the radial supporting force of the bidirectional #-shaped steel support; the plurality of displacement sensors are arranged on the outer wall of the enclosure structure and are used for measuring the lateral deformation of the enclosure structure; and the displacement sensor and the steel support axial force servo device are connected with a control system. According to the utility model, the active adjustment of the axial force of the inner support is realized, and the internal force and deformation of a support system are controlled in real time to meet the construction requirements of different construction stages.

The invention discloses an axial force synchronous monitoring system and monitoring method for a composite anchor cable, and the system can synchronously monitor the change of the axial force of an anchor cable center wire and a steel edge wire through two measurement modes in a manner that a fiber grating sensor is arranged in the anchor cable CFRP center wire and a resistance strain gauge is arranged on the steel edge wire, thereby achieving the synchronous monitoring of the axial force of the anchor cable center wire and the steel edge wire. The problem that data of a single axial force measurement mode is not accurate enough is solved, the two measurement modes are carried out independently and do not affect each other, if a single measurement mode breaks down, the other measurement mode is not affected, and the more stable and long-acting anchor cable axial force monitoring requirement can be met; the bridge box and the strain gauges form a temperature compensation circuit through the strain connecting lines, the influence that the resistance of the strain connecting lines changes along with the temperature when the strain gauges are used for monitoring for a long time is effectively eliminated, the bridge box and the ground are connected through the ground wire, the influence of an interference electric field in the strain gauge measurement process is eliminated, and the accuracy of anchor cable axial force measurement data is guaranteed.

The invention provides an evaluation method and system for a bolt connection process of a mechanical structure, and the method comprises the steps: obtaining a plurality of images containing gaps among bolts, nuts and connecting pieces within a first set time period after the bolt connection operation of the mechanical structure, carrying out the preprocessing of the images, and extracting geometric features; on the basis of the extracted geometric features, comparing the contact area of the bolt, the nut and the connecting piece with the theoretical contact area, calculating the fitting rate, and carrying out surface crack quantification to obtain an appearance detection result; the stress state of the bolt is determined based on the ultrasonic detection data, the pre-tightening force borne by the bolt is calculated, and an axial force detection result is obtained; and integrating the appearance detection result and the axial force detection result, introducing a weight and a physical constraint item, determining a final detection result, and forming an evaluation report of the bolt connection process of the mechanical structure according to the final detection result. According to the invention, the limitation of a single detection method is solved, and effective evaluation of the tightening process is realized.