1408 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.

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 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 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 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 discloses a high-field water-cooling magnet device which comprises a container assembly and a magnet coil assembly, and the magnet coil assembly is located in the container assembly and communicated with the container assembly. The container assembly comprises a hydraulic machine assembly, and the hydraulic machine assembly comprises a cylinder body, a piston, a check ring, a pressure equalizing pad, 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 axial force application 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 improved, and 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 invention provides an impeller high-temperature over-rotation test device. The impeller high-temperature over-rotation test device comprises a long shaft, an impeller, a press-fitting assembly, a buffer assembly and a fixing piece. The long shaft comprises a first shaft body and a second shaft body which are concentric and different in diameter, the impeller is sleeved on the first shaft body, and press-fitting parts are formed at two ends. The first press-fitting assembly and the second press-fitting assembly are pressed on the press-fitting parts on the two sides of the impeller correspondingly, relative rotation is prevented through the rectangular keys, the double press-fitting assemblies are symmetrically arranged to balance axial force, and rotation stability is improved. The left / right clamping sleeve is matched with the conical surface of the left / right taper sleeve, and a tensioning wire groove is formed to adapt to impellers of different sizes and compensate size changes. The buffering assemblies are arranged in a mirror symmetry mode, the horn mouth design optimizes stress distribution, long-axis thermal expansion is absorbed, and vibration impact is resisted. The fixing piece provides axial fixing force, and the axial rigidity of the system is optimized. The device can ensure the reliable positioning of the impeller at high temperature and ultrahigh speed, and improves the test precision and reliability.

The invention discloses a cable length self-adaptive bolt axial force measurement method, and relates to the technical field of bolt axial force measurement, and a system comprises a target ultrasonic transducer, a measurement terminal and an upper computer, the target ultrasonic transducer comprises an ultrasonic transduction sheet used for transmitting and receiving ultrasonic waves, a temperature measuring resistor used for sensing the temperature of a target bolt to be measured, and a ceramic resonance sheet used for enhancing and amplifying ultrasonic signals; the measurement terminal performs time-sharing execution by switching the connection combination of each core wire in the target three-core cable: measuring the resistance of the target three-core cable to obtain cable length data; measuring the loop resistance including the temperature measuring resistor to obtain current bolt temperature data; the ultrasonic transduction piece is excited with low energy, and returned echo signals are collected to obtain ultrasonic data; and the upper computer obtains the current axial force value of the target to-be-measured bolt according to the cable length data, the current bolt temperature data and the ultrasonic data. By implementing the technical scheme, the effect of improving the measurement precision and efficiency is achieved.

The invention discloses a variable-shaft-diameter rolling bearing testing device and testing method, and aims to solve the problems that an existing rolling bearing testing device is difficult to adapt to bearings with different shaft diameter specifications, and a main shaft needs to be replaced frequently. The device is composed of a testing platform, a lead screw driving mechanism, an axial loading mechanism, an inner diameter variable mechanism, an outer diameter variable mechanism, a main shaft, a bearing seat mechanism, a main shaft coupler, a main shaft motor and a supporting frame. The inner diameter variable mechanism adapts to the inner diameters of different rolling bearings through a plurality of ring petals and a chuck structure, the outer diameter variable mechanism can adjust the outer diameter and the radial applied force in real time according to the outer diameter of the rolling bearing, the axial loading mechanism can apply a preset axial load to the bearing, and besides conventional constant axial force, the axial loading mechanism can also apply axial torque in different directions. The device can adapt to the testing of rolling bearings with various shaft diameter specifications without replacing the whole set of main shaft, effectively shortens the testing preparation time, and improves the testing efficiency. And the universality and the applicability are high.

The invention relates to the technical field of bridging construction equipment, in particular to a supporting leg induction adjusting device, a supporting leg system, an adjusting method and a pile-beam all-in-one machine, the supporting leg system comprises a front supporting leg, a middle supporting leg and a rear supporting leg which are arranged below a main beam, and the front supporting leg, the middle supporting leg and the rear supporting leg are all connected with the main beam through reverse rolling wheel sets; pin shaft sensors are arranged between the reverse roller group and the front supporting leg, the middle supporting leg and the rear supporting leg, or axial force meter devices are arranged at the bottoms of the front supporting leg, the middle supporting leg and the rear supporting leg; and the pin shaft sensor or the axial force meter device is connected with the monitoring unit. The pin shaft sensor can play the same connecting and supporting role as the pin shaft, the pressure borne by the pin shaft can be measured through the built-in pressure sensor, accurate and real-time measurement of pressure data of each supporting leg can be achieved, timely and effective guidance basis is provided for the pile-beam all-in-one machine during switching among procedures, and the working efficiency of the pile-beam all-in-one machine is improved. The supporting legs can be adjusted in time so as to ensure the stability and balance of the whole machine, and the safety risk is reduced.

The invention provides an axial force active balancing method for a fluid machine. The axial force active balancing method for the fluid machine comprises the steps that S1, fluid axial force borne by an impeller of the fluid machine during working is obtained; s2, configuring a motor for driving the impeller, and enabling the motor to generate an electromagnetic axial force through design or control; and S3, the direction of the electromagnetic axial force is opposite to that of the fluid axial force, the magnitude of the electromagnetic axial force is controlled to at least partially counteract the fluid axial force, and therefore the net axial load transmitted to the supporting bearing is reduced. The driving motor is actively designed and controlled to generate electromagnetic axial force which is equal to the pneumatic / hydraulic axial force of the impeller in magnitude and opposite to the pneumatic / hydraulic axial force of the impeller in direction, so that zero returning or minimization of net axial force is realized at the bearing.

The invention discloses a steel structure beam unit section intelligent optimization method and device and a medium. Obtaining a target beam unit of which the cross-sectional area is to be calculated, and obtaining a current axial force, a current allowable stress and a plurality of working conditions corresponding to the target beam unit; obtaining an initial beam unit cross-sectional inertia moment, and respectively calculating an initial beam unit cross-sectional area, an initial X-direction cross-sectional modulus and an initial Y-direction cross-sectional modulus through a preset initial beam unit cross-sectional inertia moment function; for each working condition, calculating a beam unit cross-sectional area corresponding to each working condition through a beam unit cross-sectional area intelligent optimization calculation method; and in each beam unit cross-sectional area, selecting the maximum beam unit cross-sectional area as a target beam unit cross-sectional area corresponding to the target beam unit, and feeding back the target beam unit cross-sectional area to a user. The problems that calculation is complex, the calculated amount is large and accuracy is poor due to the fact that the cross section area of the beam unit is determined through artificial experience are solved, and the accuracy of calculating the cross section area of the beam unit is improved.

The invention relates to an experimental device for testing anchoring force of slips. The experimental device comprises an experimental bench; the experimental slip is used for simulating a plugging device or a packer and measuring the anchoring force between the experimental slip and the experimental pipeline; the radial force loading assembly is fixed with the experiment rack and is used for applying radial force to the experiment slip; and the axial force loading assembly is fixed with the experiment bench and is used for applying axial force to the experiment slip. According to the invention, the measurement precision of the slip anchoring force is greatly improved.

The invention belongs to the field of vehicle reliability detection, and particularly relates to a real-time acquisition device and method for the axial force of a wheel connecting bolt. Comprising a wheel adapter plate, a data transmission slip ring, a large electric connector, a small electric connector, a flexible supporting assembly, a data acquisition unit and an axial force measuring bolt. A working strain gauge is embedded in an axial stress concentration area of the axial force measuring bolt, a temperature compensation strain gauge is pasted on a bolt head to form a half-bridge measuring circuit, and a strain signal rotating along with a wheel is transmitted to a fixed end data acquisition unit through a signal lead via a small electric connector and a data transmission slip ring. The acquisition unit can calculate real-time axial force according to a pre-stored calibration coefficient and output the real-time axial force to a vehicle-mounted terminal or a remote server in a wireless or wired mode. According to the method, the whole-course waveform data of the axial force of the wheel connecting bolt can be continuously obtained under any vehicle speed, load and temperature conditions, changes caused by dynamic impact and heat effect are accurately captured, and the precision and traceability of wheel train connection fatigue life prediction and safety evaluation are improved.

The invention relates to the technical field of motor testing devices, and provides a propeller motor load characteristic simulation testing device, which comprises a bracket (10), a turntable (20), a plurality of electromagnets, a load motor (50) and a detector (40), the turntable (20) is arranged in the bracket (10), and the propeller motor (100) can drive the turntable (20) to rotate; the electromagnets are used for providing radial force load, axial force load and unbalanced bending moment load for the output shaft; the load motor (50) is used for applying torque to the output shaft; the detector (40) is used for detecting the radial force load, the axial force load, the unbalanced bending moment load and the torque of the output shaft. The propeller motor load characteristic simulation test device can simultaneously, independently or compositely test the radial force load, the axial force load, the unbalanced bending moment load and the torque of the output shaft of the propeller motor (100), and multi-dimensional simulation of the load of the propeller motor is realized.

The invention provides a brake comprising a stator assembly comprising a stator iron core and a coil winding, and the coil winding is arranged on the stator iron core; the hub assembly comprises a hub and magnetic steel, and the magnetic steel and a friction part are arranged on the side, facing the stator core, of the hub; the armature is arranged between the stator assembly and the hub assembly; when the coil winding is electrified, the armature is adsorbed on the stator iron core; and when the coil winding is powered off, the armature is adsorbed on the friction part under the action of the magnetic force of the magnetic steel to brake the hub. During power-off braking, the suction force of the magnetic steel to the armature and the counter-acting force of the hub to the armature are mutually counteracted in the brake and do not act externally, and the axial force of a traditional brake to a motor is eliminated.

The invention discloses an organic working medium turbine axial force supporting component which comprises a hydraulic thrust disc, thrust pads, oil sprayers, a thrust base ring and a clamping ring, the multiple thrust pads are evenly distributed in the circumferential direction and supported on the thrust base ring through protruding edges at the bottoms of the thrust pads, and the oil sprayers are fastened to the thrust base ring and located between the thrust pads. A plurality of middle oil injection holes for supplying lubricating oil to the middles of the pads are formed in the top of the oil injector in the radial direction, inclined planes are arranged on the two sides of the oil injector, outer inclined plane oil injection holes and inner inclined plane oil injection holes for supplying cooling oil are formed in the inclined planes, end discharge grooves are formed in the positions, close to the inner diameter, of the thrust pads, and oil blocking dams are formed between the end discharge grooves and the inner diameter of the thrust pads in the radial direction. And the end discharge chute is communicated with a cooling hole arranged in the thrust pad. The stirring loss of lubricating oil gathered between the inner diameter of the thrust pad and the rotating shaft is avoided, the high-temperature area of the thrust pad is cooled through low-temperature lubricating oil discharged along the inner diameter end of the thrust pad, and the bearing capacity of the axial force supporting component of the organic working medium turbine is improved.

The invention discloses a failure detection method and device for a battery pack bolt, a storage medium and a program product, and the method comprises the steps: carrying out the multi-parameter coupling analysis of the axial force and transverse shear component force of a beam unit and a bolt assembly through combining the axial force and transverse shear component force of the beam unit obtained through random vibration simulation; the residual pre-tightening force and the anti-sliding capacity of the bolt assembly are quantitatively evaluated, the failure risk of the bolt assembly is further determined according to the residual pre-tightening force and the anti-sliding capacity of the bolt assembly, the advantages of a frequency domain linear random vibration simulation method are reserved, and the purpose of effectively checking the anti-loosening performance of the bolt can be achieved. The problems that a traditional test is low in efficiency, a simulation model is excessively simplified and failure criteria are incomplete are effectively solved, and the method has the advantages that the detection accuracy is improved, the test cost is reduced, the calculation efficiency is improved, and potential failure points are comprehensively covered.

The invention belongs to the technical field of permanent magnet coupling assembly, and discloses a permanent magnet coupling rotor folding tool and an axial force calculation method thereof. The permanent magnet coupler rotor folding tool comprises a cast iron floor, a T-shaped nut block, a sliding bearing seat base, a screw rod, a shaft clamp spring, a sliding bearing seat, an inner rotor supporting flange, a permanent magnet coupler inner rotor, a permanent magnet coupler outer rotor and an outer rotor supporting seat. According to the calculation method, a magnetic force analysis model between a pair of cuboid permanent magnets is taken as an entry, and a magnetic force action principle is mapped between a pair of permanent magnet rings formed by alternately arranging N-S pole paired permanent magnets by virtue of a coordinate transformation and vector superposition method; meanwhile, the influence of a permanent magnet machining and assembling process and a rotor hub material is comprehensively considered, and the axial acting force at different assembling positions when the inner rotor and the outer rotor of the permanent magnet coupler are closed is accurately calculated; the method is clear in solving thought and high in speed, provides theoretical reference for the actual assembly process, and is a method with engineering universality and convenience.

The invention relates to the technical field of ultrasonic stress measurement, and discloses an ultrasonic axial force high-speed real-time measurement system which comprises a core processor module which controls a transducer to alternately transmit and receive longitudinal wave and transverse wave echo signals and calls a fingerprint template established based on a geometric structure of a bolt to perform cross-correlation operation so as to determine transit time, according to the method, by constructing the acoustic characteristic normalization ratio, the influence of uniform temperature change is inhibited on the aspect of the measurement principle, and the inherent problems of model misalignment and error amplification in a traditional compensation mode are avoided; echo positioning is carried out by using geometric fingerprints of the bolt, a filtering algorithm with high calculation amount is replaced, the reliability of the system is improved, and high-precision measurement can be realized on a low-power-consumption general processor.

The invention discloses a frame structure design method based on rigidity reduction. The method comprises the following steps that 1, rod end bending moments Mb and Mc and axial force Nc of frame beams and columns are obtained through calculation; step 2, obtaining actual reinforcement areas Asb0 and Asc0, section sizes and concrete strength of frame beams and columns; 3, the equivalent stiffness Kb1 of the frame beam is obtained through calculation according to the formula Kb1 = Mb0.75y / phi b0.75y; 4, the equivalent stiffness Kc1 of the frame column is obtained through calculation according to the formula Kc1 = Mc0.75y / phi c0.75y; 5, comparing the equivalent stiffness of the frame beam and the frame column with the initial flexural stiffness, and ending after the deviation is less than or equal to 15%; 6, calculating a shear force design value of the frame beam, calculating stirrups needing to be configured for the frame beam, and rechecking a shear-resistant section; and 7, calculating a shear force design value of the frame column, calculating stirrups needing to be configured for the frame column, and rechecking a shear-resistant section. Compared with the prior art, an overall calculation model of the frame structure is established, the real rigidity of a structural member is obtained through multiple iterations, section reinforcement is optimized, and the reinforcement amount is reduced; and the overall anti-seismic performance is improved.

According to the loading device and method for the vibration test of the brake, a motor flexible shaft drives a driving mechanism to rotate to transmit power to the input end of a product, the output end of the product loads axial force through a thrust mechanism, and an eddy current sensor assembly is used for measuring the radial clearance variation of a spline of the product under a vibration load. The device can simulate and measure the actual use condition and vibration performance of a product on an airplane, can truly examine the performance and reliability of the product under the vibration test condition, is convenient to operate, can meet the vibration test requirements of products of the same type and different specifications, and has high applicability.

An axial force measurement device includes a frame, a tightening actuation unit that performs tightening operation upon a screw type tube fitting installed upon a tube upon which is formed an annular portion projecting in the radially outward direction from the tube, a testing member, and a mating member holding unit that holds the testing member into which the tube fitting is screwed and that is coupled to the tube. The tightening actuation unit and the mating member holding unit are provided to the frame in line along the direction of a reference axis that extends in the direction of the center line of the tube fitting and the tube axis of the tube. The testing member has a first part that engages with the tube fitting, and a second part against which the annular portion of the tube is pressed.

The invention provides a concrete normal section reinforcement design method and system, electronic equipment and a storage medium. The method comprises the following steps: establishing a section stress model containing multi-layer reinforcement strain distribution based on plane section assumption; the stress state of the whole process of the section from axle center compression to axle center tension is simulated by setting strain proportion parameters of the strain of the outermost reinforcing steel bar on the tension side and the limit pressure strain of the concrete; aiming at a plurality of set strain state control points, calculating stress of each steel bar layer position, contribution of the stress to axial force and bending moment and contribution of the stress to a concrete compression area; and based on the section static balance condition, the optimal reinforcement area meeting the design load requirement is determined through iterative calculation, and the configuration constraint of multiple layers of steel bars is considered in the iterative calculation. The method overcomes the defects that a traditional method overestimates the effect of the pressed steel bars and ignores the strain difference of multiple layers of steel bars, and the accuracy and safety of reinforcement design of high-performance concrete structures such as nuclear islands are remarkably improved.

The invention relates to a foundation pit deformation control method based on a TabPFN model and a supporting axial force servo system, and the method comprises the steps: S1, constructing a servo supporting-wall deformation data set through a servo supporting data simulation module according to the servo supporting force of the supporting axial force servo system and wall deformation response data; s2, a deformation prediction agent model module constructs and optimizes a TabPFN model, the deformation prediction agent model rapidly predicts wall deformation caused by foundation pit excavation according to the input servo supporting force, and a wall deformation prediction result is obtained; and S3, a cross-stage multi-objective optimization module constructs a multi-objective optimization framework fused with a differential evolution algorithm, sets a plurality of objectives, inputs the wall deformation prediction result obtained in the step S2 into the multi-objective optimization framework, and collaboratively optimizes wall maximum deformation control and servo force unloading risks to obtain a global optimal combination. The method is a multi-stage and multi-target servo support optimization control method oriented to foundation pit engineering.

The invention discloses a composite beam plastic flexural capacity correction calculation method considering interface slippage. The method is suitable for a hogging moment area of a steel-concrete composite beam reinforced by an external prestress carbon fiber reinforced composite material rib. The method comprises the following steps: firstly, determining basic static boundary parameters and a shear connector constitutive model; in the iterative calculation, solving a temporary bearing capacity by utilizing an axial force and moment balance equation, and calculating interface slippage along the beam length and a deformation loss item at the support based on internal force distribution; then determining a rigidity degradation coefficient according to the average slip amount, and dynamically reducing the static yield bending moment to reconstruct the plastic hinge length; and finally, constructing a corrected deformation coordination equation, deducting a deformation loss item in geometric deformation calculation to obtain the real elongation of the in-vitro CFRP rib, and updating a stress parameter until a result is converged. According to the method, by introducing a deformation loss item and a rigidity degradation mechanism, deviation caused by traditional rigid connection assumption is corrected, and accurate prediction of the ultimate bearing capacity is achieved.

The invention relates to the technical field of intelligent monitoring, and particularly discloses a built-in drilling machining axial force monitoring method and system.The method comprises the steps that multi-channel original force signals are synchronously collected through a plurality of annular piezoelectric type force sensors connected with a spindle mounting bolt in series, and filtering, normalization and abnormity elimination preprocessing are conducted on the multi-channel original force signals; the method comprises the following steps: eliminating abnormal data by adopting consistency verification, dynamically distributing weights in combination with historical reliability of a sensor, performing fusion calculation on a total axial force value, dynamically setting a self-adaptive early warning threshold value based on learning samples of first 10 holes, performing real-time optimization, analyzing reading distribution uniformity and pre-tightening force deviation of the sensor, and identifying an eccentric load and bolt abnormality. Through closed-loop control of a standard interface and a machine tool numerical control system, machining parameters are adjusted in a graded mode or sudden stop is triggered. According to the method, the axial force monitoring precision and the anti-interference capability are improved, the early warning false alarm and missing alarm rate is reduced, the equipment health diagnosis function is expanded, the machining quality and the equipment safety are guaranteed, and the method is suitable for high-end equipment drilling machining scenes.

The invention discloses a high-current-carrying water-cooling magnet coil combined structure which comprises a hydraulic machine assembly, a coil A and a coil B, wherein the coil A and the coil B are connected in series. 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 coil A and the coil B are electrically connected in series through an AB electric connecting plate, the first force transmission column is in insulated connection with the AB electric connecting plate, and the second force transmission column is in insulated connection with the coil B; and the electromagnetic coil between the coil A and the coil B is insulated through an insulating cylinder assembly. 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 improved, and 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 structure of the insulating cylinder assembly realizes high current carrying of the A coil and improves the magnetic field intensity of the water-cooled magnet.