1646 results about "Bending moment" patented technology

The invention discloses a wind turbine generator hoisting construction tower drum operation system and a construction method thereof, and relates to the technical field of intelligent control. The problems that in the prior art, a static tension balance mechanism cannot restrain bending moment abrupt change, steel-concrete interface stress concentration causes microcrack propagation, the wave dynamic load compensation capacity is insufficient, and dynamic rigidity attenuation early warning is lacked are solved. Comprising a dynamic load prediction module, a multi-mode vibration suppression module, an offset compensation module and a digital twinborn decision module, a hoisting load is solved in real time through a multi-physics field coupling model and an improved time sequence deep learning algorithm, and interface crack propagation is suppressed in combination with traveling wave offset control and sweep frequency vibration. An improved Morison equation is adopted to drive a two-stage hydraulic servo to compensate a wave dynamic load, and a digital twin closed-loop correction mechanism is constructed based on a 5G URLLC protocol; the tower drum hoisting precision, the structural safety and the operation reliability under the complex working condition are remarkably improved.

The invention relates to the technical field of railway vehicles, and provides a wheel set, a bogie and a railway vehicle. The wheel pair comprises a shaft sleeve structure, an axle, a pair of wheels and a connecting structure; the axle is rotationally arranged in the shaft sleeve structure; the pair of wheels is arranged at the two ends of the shaft sleeve structure respectively and rotationally connected with the shaft sleeve structure. The connecting structure is connected with the axle and the wheels and used for achieving synchronous rotation of the axle and the wheels. According to the wheel set, the bogie and the railway vehicle, the wheels are rotationally connected with the shaft sleeves, the axles are rotationally connected with the shaft sleeves, synchronous rotation between the axles and the wheels is achieved through the connecting structures, torque is transmitted between the axles and the wheels, the shaft sleeves bear bending moment, and therefore decoupling of the torque transmission function and the bearing function is achieved; the requirement on the strength of the axle is effectively reduced; in addition, the freedom degree of structural design is improved, and the overall weight is reduced.

The invention relates to the technical field of hogging moment region calculation, in particular to a hogging moment region long-term rigidity prediction method for a steel-concrete composite beam bridge. The invention discloses a long-term rigidity prediction method for a hogging moment area of a steel-concrete composite beam bridge. Comprising the steps that a welding stud connecting piece degradation time-varying model and a concrete bridge deck degradation full-time-domain model under the corrosion-fatigue coupling effect are constructed according to test data, and a steel-concrete composite beam bridge hogging moment area rigidity degradation model, steel-concrete composite beam bridge hogging moment area long-term rigidity prediction and the like are constructed. In the process of predicting the rigidity of the hogging moment area of the steel-concrete composite bridge, the deterioration mechanism of a welding stud connector under the corrosion-fatigue coupling effect is considered, the pitting corrosion condition under the environment influence and the welding stud crack condition under the vehicle load influence are considered, the influence of bridge deck slab cracks is considered in the pitting corrosion condition, and the rigidity of the hogging moment area of the steel-concrete composite bridge is predicted. In addition, the mutual relation among the welding stud pitting corrosion influence, the welding stud crack influence and the bridge deck crack influence is considered, and the rigidity of the hogging moment area of the steel-concrete combined bridge is accurately analyzed.

The invention discloses a method for calculating the flexural capacity of a prefabricated segmental girder bridge based on steel shear keys, and belongs to the technical field of fabricated prefabricated segmental girder bridges. According to the method, on the basis of the concrete plasticity theory, a theoretical stress model of bending plastic deformation of the prefabricated segmental girder bridge is constructed, a cracking bending moment calculation formula of the three-section type prefabricated segmental girder bridge is established, and design refinement and design efficiency are improved; based on the fact that the anti-bending bearing capacity of the joint of the segmental beam is mainly determined by deformation of a pressed area of a concrete top plate and limit stress of a steel strand, a calculation formula of the anti-bending bearing capacity of the three-section type prefabricated segmental beam bridge at the joint and the non-joint is provided; according to the method, the plastic deformation of the concrete and the bonding slippage effect of the reinforcing steel bars are considered, the bending bearing capacity of the three-section type prefabricated segmental girder bridge can be accurately calculated, and the calculation method is verified to be safe and reliable through comparison with an experimental value.

According to the three-point bending high-temperature fatigue test instrument and method based on X-ray in-situ imaging, an extreme thermal field is applied to a sample based on halogen lamp infrared radiation focusing heating, a clamp ascends and descends through a servo hydraulic cylinder, and axial displacement of the ends of the sample is converted into bending moments at the two ends through the rotation characteristic of a connecting rod mechanism; therefore, a monotonous or cyclic bending external load is applied to the sample. Meanwhile, an oxidizing or inert test gas atmosphere is provided. And the acoustic emission system monitors the material damage failure starting time in real time. The device is small in size, high in precision and fast in response, and provides technical support for the damage evolution process characterization and failure damage mechanism research test of the tested sample under the heat-force-oxygen multi-field coupling action by combining a three-dimensional high-temporal-spatial-resolution X-ray characterization technology.

The invention discloses a folding wing and rudder design method and an unfolding locking mechanism thereof. The locking mechanism comprises a connecting handle, an elastic torsional spring and a rotating shaft. A locking head and a connector are arranged on the two sides of the bottom of the folding wing or the folding rudder respectively; the design method comprises the steps of obtaining performance parameters, and determining specific indexes such as folding sizes and unfolding time of the folding wing and the rudder. And designing a structural model according to principles of generalization, reliability and the like, and determining geometric parameters of the wing and the rudder. Verifying the strength of parts of the locking mechanism, calculating a plurality of parameters of an elastic torsion spring, and analyzing the unfolding time and synchronism. Finally, consistency checking is conducted based on finite element simulation analysis, torque and bending moment are applied in ABAQUS software according to parameters, the structural strength of the folded rudder is analyzed, and it is ensured that the design meets the requirement. According to the folding wing and rudder design method, through the scientific design process and multi-principle comprehensive application, the high-performance requirement is met, meanwhile, the cost is effectively reduced, the reliability and maintainability of products are improved, and the remarkable beneficial effects are achieved.

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention provides a plate anchor ultimate bearing capacity calculation method and device. The method comprises the steps that soil body strain softening, anchor plate geometry and ocean clay initial mechanical parameters are obtained; the method comprises the following steps: constructing a Drucker-Prager elastic-plastic numerical model based on a Cosseerat continuum theory; calculating bearing capacity under different burial depth ratios, inclination angles beta and softening moduli; determining a burial depth ratio demarcation threshold value; constructing a burial depth and dip angle coupled reference bearing capacity formula, which is divided into burial depth ratio lt; 4 and > = 4, respectively using quadratic polynomial and linear regression analysis; constructing a strain softening correction coefficient formula, and fitting in two working conditions; and generating a comprehensive ultimate bearing capacity empirical formula in combination with the reference formula and the correction coefficient formula. According to the method, the rotational degree of freedom and the bending moment balance item are introduced, the grid dependence is reduced in combination with the characteristic length parameter, the comprehensive empirical formula is constructed through large-scale parameterized numerical calculation, and the prediction error is effectively reduced.

The invention belongs to the technical field of workpiece precision control, and discloses a precision control system and method for a large-curvature and shallow-drawing formed part, and the method comprises the steps: obtaining initial geometric parameters and material mechanical property parameters of the formed part; establishing a finite element analysis model of the formed part; discretizing the finite element analysis model of the formed part into n nodes, and calculating stress distribution at the n nodes of the formed part in the unloading process, strain energy generated by rebound and rebound bending moment formed by the strain energy; based on the stress characteristics of the n nodes, carrying out characteristic clustering on the n nodes to obtain m node areas; solving the overall rebound deformation and rebound strain energy of the m node areas by using an eagle-eye algorithm; the tolerance range is preset, the rebound bending rigidity of the corresponding area of the node area with the rebound deformation exceeding the tolerance range is increased on the basis of the characteristic geometrical shape design, the deformation generated by rebound bending moment is offset, and the size precision and shape quality of the large-curvature and shallow-drawing forming part are effectively improved.

The invention discloses an insertion tube and a manufacturing method thereof, an insertion part and an endoscope, and relates to the technical field of medical instruments, the insertion tube comprises an insertion body and an elastic tube, a first reinforcing layer and a second reinforcing layer are arranged in the insertion body, the second reinforcing layer is arranged outside the first reinforcing layer in a surrounding mode, and the first reinforcing layer is provided with a concave part. The first reinforcing layer and the second reinforcing layer can form double limiting and wrapping supporting on the elastic pipe, the concave shape of the concave part of the first reinforcing layer is utilized to be attached to the outer wall outline of the elastic pipe, and the outer side of the second reinforcing layer is matched for enclosing and restraining, so that the installation stability of the elastic pipe in the first channel can be greatly improved; bending moment generated by self-gravity, external force and the like of the elastic tube is effectively counteracted, the elastic tube is prevented from being bent under the action of self-gravity, external force and the like, the whole insertion tube is prevented from deforming along with bending of the elastic tube, and the form stability of the insertion tube in the cavity in the propelling process is guaranteed. And the straightness of a traction rope transmission path and the accurate conduction of a control instruction are ensured.

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 provides a rotary steering fatigue life prediction method and system considering dynamic characteristics, and the method comprises the steps: building a three-dimensional structure model based on a set target test structure, analyzing dangerous points based on a statics finite element simulation model in combination with a set test well section, and determining the static Mises stress of each point; introducing a dynamic boundary load to construct a dynamic finite element simulation model, and analyzing the dynamic Mises stress of each point; calculating a dynamic load addition coefficient of each point according to the dynamic maximum stress and the static stress; in addition, dynamic load characteristics at all points are analyzed from multiple aspects of bit pressure, torque and bending moment; analyzing fatigue characteristics according to the material of the structure corresponding to the dangerous point; and designing a linear damage accumulation operation model, integrating the calculation results to calculate a fatigue index value for multiple input rounds, and further determining the fatigue life of the whole string of tools. According to the scheme, the defects of incomplete operation angles and insufficient accuracy in the prior art can be overcome, and accurate prediction is realized by fully considering dynamic load characteristics and material characteristics of different structures.

The invention discloses a sleeve type bending limiting device convenient to disassemble, and relates to the technical field of ocean pipe cable protection equipment. The bending limiter comprises a plurality of bending limiting units and a plurality of sleeves, and the adjacent bending limiting units are connected through the sleeves; the bending limiting units are used for containing ocean pipe cables, and the ends of the bending limiting units are provided with connectors. The sleeves comprise a first sleeve and a second sleeve, one sides of the first sleeve and the second sleeve are connected through a connecting piece, and the other sides of the first sleeve and the second sleeve are connected through a bolt; and clamping grooves are formed in the first sleeve and the second sleeve. The bending limiting unit is matched with the sleeve, bending deformation of the bending limiting device is achieved through movement of the connector in the clamping groove, the bending moment of the ocean pipe cable is transferred, the stress concentration condition of the bending limiting device is remarkably optimized, the protection performance of the ocean pipe cable in the complex seabed environment is enhanced, and the service life of the ocean pipe cable is prolonged. And in addition, disassembly and replacement are convenient when faults occur in the service process, and later maintenance is facilitated.

The invention discloses a two-degree-of-freedom clamp capable of adjusting the bending moment and direction of a turbine blade and a test method. The two-degree-of-freedom clamp comprises a blade clamping component, an upper adjustable U-shaped head, a lower adjustable U-shaped head, an upper clamping rod and a lower clamping rod. The blade clamping component is in threaded connection with the upper adjustable U-shaped head and the lower adjustable U-shaped head, the other end of the upper adjustable U-shaped head and the other end of the lower adjustable U-shaped head are connected with the upper clamping rod and the lower clamping rod respectively, and the other end of the upper clamping rod and the other end of the lower clamping rod are connected with an upper clamping head and a lower clamping head of the fatigue testing machine respectively. The upper clamping rod and the upper adjustable U-shaped head are adjustably connected in pairs in the transverse direction intersecting with the vertical axis so as to adjust the eccentricity of the turbine blade load. The eccentric angle of the blade load can be adjusted by adjusting the rotation cycle of the blade clamping component. According to the clamp disclosed by the invention, by adjusting the eccentricity and the eccentricity angle during a turbine blade test, different bending moment directions and relative sizes of different sections during the turbine blade test can be realized, so that the aim of simulating a real load is fulfilled.

The invention discloses a method for calculating stress and deformation of a roller carrier supporting thin-walled cylinder under the action of dead weight, which comprises the following specific steps of: S1, calculating the bending moment and deflection of a cylinder body in the longitudinal direction by adopting an overhanging beam model in the longitudinal direction, and determining the optimal position of the roller carrier in the longitudinal direction according to the maximum bending moment minimization and the maximum deflection minimization of a beam; s2, transversely utilizing symmetry to establish a semicircular curved beam model, and calculating bending moment and displacement in a transverse plane of the cylinder by adopting a Temosinke beam theory; s3, calculating the maximum stress in the cylindrical surface according to the in-surface bending moment, and determining the optimal half wrap angle required by the strength; and S4, calculating the ovality and root-mean-square roundness of the curved beam according to the displacement, and determining the optimal half wrap angle required by deformation. According to the method, the maximum stress and the deformation shape of the thin-walled cylinder are accurately predicted, and the optimal wrap angles of the roller carrier under the strength requirement and the deformation requirement can be determined to be 67.4 degrees and 90 degrees respectively, so that the optimal wrap angle is suggested to be between 67.4 degrees and 90 degrees in engineering.

The invention discloses a double-row anti-slide pile internal force obtaining method and system, and relates to the field of geotechnical engineering.The double-row anti-slide pile internal force obtaining method comprises the steps that indoor experiments are conducted on pile top displacement, pile periphery soil pressure distribution and pile body bending moment and shearing force distribution of a coupling-beam-free double-row anti-slide pile, and the stress characteristics and deformation characteristics of the coupling-beam-free double-row anti-slide pile are obtained; constructing a coupling-beam-free double-row anti-slide pile internal force calculation model; an anti-slide pile is simplified into an elastic foundation beam with a fixed range above a slide surface as a directional support, a pile structure is divided into a load-bearing section and a load-bearing section-built-in section from the directional support, and the internal force of the coupling-beam-free double-row anti-slide pile is determined; the stress and deformation characteristics of the coupling-beam-free double-row anti-slide pile are input into the coupling-beam-free double-row anti-slide pile internal force calculation model, and the internal force of the whole pile body of the coupling-beam-free double-row anti-slide pile is accurately obtained.

The invention belongs to the technical field of buffeting detection of aircraft model supporting systems, and discloses a wind tunnel experiment vibration analysis method based on a vibration control equation. According to the elastomer theory, an engineering model is simplified into a non-uniform cross-section beam, the constraint condition is that one end is fixedly connected, the other end is attached to a mass block, and non-uniform dynamic excitation loads are distributed on the surface, and a vibration control equation of the micro-unit is listed according to the Alembert principle; according to the Euler-Bernoulli theory, a relation equation of the bending moment and the deflection of the elastomer is constructed; a system vibration differential equation is obtained, the number of needed measurement points is determined according to the property of the equation, the equation is solved, a vibration analysis model of the system is obtained, and the vibration relation between local parts of the vibration system is further analyzed. The wind tunnel experiment vibration analysis method based on the vibration control equation lays a theoretical foundation for engineering application scenes of vibration control, vibration decoupling, vibration testing and the like of the wind tunnel experiment, and is a simple and efficient analysis calculation method.

The invention relates to the technical field of on-line monitoring, in particular to a wind generating set spindle vibration displacement monitoring method and system, and the method specifically comprises the steps: constructing a gravity bending moment periodic function and a stiffness azimuth modulation strategy, and obtaining spindle endpoint displacement caused by blade gravity; comparing each unit partition on the single blade to obtain a first interference coefficient, and comparing each unit partition with the unit partition of the predicted rotation transfer position to obtain a second interference coefficient; obtaining a third interference coefficient through the gear friction coefficient; establishing a main shaft vibration displacement prediction model, and predicting and outputting a predicted value of the main shaft vibration displacement in the next monitoring time period; and comparing the predicted value of the vibration displacement of the main shaft in the next monitoring time period with the actually measured vibration displacement of the main shaft, and performing abnormal vibration alarm. The problems that in the prior art, under the complex operation condition, the deviation between the predicted value and the measured value of the vibration displacement of the main shaft is too large, and the risk of misinformation or missing report is high are solved.

The invention discloses a railway bridge earthquake response calculation method based on a friction pendulum support, which comprises the following two steps of: firstly, proposing an earthquake reduction and isolation support response simplification analysis method which comprises displacement response simplification calculation of a main beam, each support and a pier / platform; carrying out optimal calculation on the equivalent damping ratio of the equivalent linearization system; an equivalent linearization analysis method is simplified; and the equivalent linearization analysis method is explicit. Then providing a pier internal force response simplified analysis method which comprises the following steps: simplifying the pier internal force response into calculating an earthquake effect according to a rigid body; and calculating the combined shear force and bending moment of the pier bottom according to the sum of absolute values. According to the method, the operation workload is reduced, the calculation efficiency is improved, and a structure engineer can conveniently carry out a large amount of design optimization work.

Disclosed is one example of an easy chair capable of inhibiting links from being deformed and damaged when a large load acts on a cushion frame. A posture-changing mechanism of the easy chair includes a first link, a second link, and a male threaded rod, and these form a truss structure. Thus, in principle, no large bending moment is generated in the first link, the second link, and the male threaded rod. This posture-changing mechanism makes it possible to inhibit the first link, the second link, and the male threaded rod from being deformed and damaged by a bending moment when a large load acts on the cushion frame.

The invention relates to the technical field of bridge construction, and discloses a guide-beam-free incremental launching construction hoisting balance weight structure for bridge construction, which comprises an incremental launching platform and a gantry crane above the incremental launching platform, the counterweight assembly comprises two slide rails, two wheel carriers, two groups of rollers, a base, a plurality of counterweight blocks, two groups of guide wheels and two pull ropes; and the lubricating assembly is used for lubricating the two groups of rollers. Through the arrangement of the counterweight assembly, the base can move reversely along with the movement of the gantry crane, self-adaptive position adjustment of the multiple counterweight blocks is achieved, the gantry crane and the multiple counterweight blocks are kept in a balanced state on the pushing platform, the bending moment and the shearing force peak value of the pushing platform are reduced, and through the self-adaptive position adjustment, the service life of the pushing platform is prolonged. And the operation of actively adjusting the position of the balancing weight by an operator is reduced, and the operation time is saved.

The invention relates to a bending moment-torque composite loading device for testing the load capacity of a steering engine, and belongs to the technical field of ammunition weapon system testing. In the device, the pressure head, the pressurizing rod and the composite loading slip ring synchronously rotate along with the rotation of the rudder wing, so that the applied pressure can be ensured to be always perpendicular to the rudder surface and is closer to the real wind resistance working condition during flight. The bending moment output device and the torque output device are coupled together through the composite loading slip ring, so that the bending moment and the torque can be loaded at the same time and are closer to the actual flight condition.

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 provides a vertical shaft type shield segment prototype loading test device and test method, and relates to the technical field of shield tunnel engineering, the test device comprises a support supporting body and a reaction frame body, and the reaction frame body is provided with a radial loading assembly, a hoop loading assembly and a hoisting loading assembly; the test ring pipe piece is vertically placed, equivalent bending moment is applied in a graded mode through the radial loading assembly, equivalent axial force is applied in a graded mode through the hoop loading assembly, and lifting acting force is applied in a graded mode through the hoisting loading assembly so as to achieve self-weight balance. Compared with a flat-lying type test in the prior art, the test device is used for a standing type segment prototype loading test, and the actual stress state of a segment is simulated more truly; besides, dead-weight balance is realized by hoisting the loading assembly, the dead-weight counter-force effect of the duct piece provided by the stratum in the actual working condition can be accurately simulated, the problem of dead-weight counter-force concentration in the standing type duct piece prototype loading test is solved, and the actual stress state of the duct piece is simulated more truly.

The invention relates to a continuous rigid frame bridge capable of reducing mid-span downwarping of a main beam and a construction method, and belongs to the technical field of bridge engineering. Comprising a plurality of web sagging moment prestressed steel beams, a main beam and a plurality of piers, the web sagging moment prestressed steel beams are composed of two first steel beams, two second steel beams and a third steel beam, two main beam webs and a plurality of main beam toothed plates are arranged in the main beam, the first steel beams are arranged above the third steel beam, and the first steel beams and the third steel beam are horizontally arranged; the two ends of the third steel beam are connected with the two first steel beams in a one-to-one correspondence mode through the two second steel beams, the second steel beams are in arc transition connection with the first steel beams and the third steel beams, the first steel beams, the second steel beams and the third steel beams are all arranged in a main beam web, and the ends, away from the second steel beams, of the first steel beams are anchored to a main beam toothed plate. And the third steel beam is arranged at the lower part of the main beam web. According to the invention, the problem of down-warping of the prestressed concrete continuous rigid frame bridge caused by the radial acting force of the prestressed steel beams of the bottom plate is solved.

The invention provides a counterweight difference adjustment method for hogging moment area jacking of a special-shaped multi-girder steel-concrete composite beam, which comprises the following steps of: establishing a finite element model of the special-shaped multi-girder steel-concrete composite beam, and arranging two ends and the middle part of the special-shaped multi-girder steel-concrete composite beam on a beam column; performing jacking height simulation of different numerical values on the special-shaped multi-girder steel-concrete composite beam at the middle supporting point for many times to obtain a first bridge deck stress result at the middle supporting point; carrying out balance weight difference adjustment finite element simulation on the basis of the first bridge deck stress result, and applying a balance weight along the line type of the main beam to adjust the pre-compressive stress of the bridge deck at the middle fulcrum of the main beam so as to achieve a design target; and the concrete bridge deck is constructed on the basis of counterweight data obtained through counterweight difference adjustment finite element simulation. By establishing a finite element model and carrying out multi-group jacking height simulation and subsequent counterweight difference adjustment simulation, the stress state of the bridge deck at the middle fulcrum of each main beam under different working conditions can be accurately determined. The counter weight is applied on the basis, so that the stress nonuniformity caused by a special-shaped structure and a multi-girder system can be effectively made up, the pre-compressive stress of the bridge deck at the middle supporting point of each girder is more uniform, and the design goal is accurately achieved.

The invention discloses an anti-slide pile cantilever section internal force and displacement calculation method and system and a storage medium, and the calculation method comprises the following steps: taking two endpoints of linear distribution force, a concentrated force action point and a bending moment action point as segmentation nodes, segmenting a cantilever section, and dividing the cantilever section into n sections; determining a top node coordinate and a bottom node coordinate of each segment, acquiring a linear distribution force function of each segment, determining a node force vector of each segment node, establishing an internal force and displacement vector formula of each segment, and calculating an internal force and displacement value of a top node of the ith segment of the pile body by taking an internal force and displacement value of an anchoring point as a boundary condition, and calculating a coefficient vector of the (i + 1) th section of the pile body by taking the coefficient vector as a boundary condition of the (i + 1) th section of the pile body until coefficient vectors of all pile body sections are calculated, and bringing the coefficient vector of each section of the pile body back to a formula to obtain an internal force and displacement expression of the whole cantilever section of the pile body. The internal force and displacement of the slide-resistant pile cantilever can be solved at the same time, and calculation is simpler, more convenient and more accurate.

The invention discloses a magnetic suspension force determination method and device, a storage medium and a computer program product, and relates to the field of wind power engineering, and the magnetic suspension force determination method comprises the steps: determining the maximum bending moment force which can be resisted by a wind wheel according to the maximum wind power and the farthest force arm borne by the wind wheel in the rotation process of a historical time period; the size of a permanent magnet in the passive magnetic suspension bearing is determined according to the maximum bending moment force and the weight of the wind wheel, the fixed part of the passive magnetic suspension bearing is arranged on the outer side of the wind wheel, and the rotating part of the passive magnetic suspension bearing is arranged on the inner side of the wind wheel; the magnetic suspension force of the passive magnetic suspension bearing is determined according to the size of the permanent magnet, and the magnetic suspension force is used for suspending the wind wheel at the target height. By the adoption of the technical scheme, the problem that in the prior art, due to the fact that the main bearing of the vertical-axis wind turbine makes contact with the wind wheel, the main bearing bears huge loads, and mechanical abrasion of the main bearing is caused is solved.

According to the method for designing the reasonable arch axis of the large-span arch bridge based on the hybrid calculation algorithm and the self-adaptive load distribution, an analytic equation method, a curve fitting method and an intelligent optimization algorithm are combined, and by selecting the initial arch axis, introducing a dynamic load distribution model and applying a genetic algorithm and a particle swarm optimization algorithm, the reasonable arch axis of the large-span arch bridge is designed. Global and local optimization is carried out, and the optimal shape and load distribution of the arch axis are ensured. And finally outputting design parameters, such as a control point, a bending moment, thrust and the like. According to the method, the design precision, flexibility and safety can be effectively improved, the material utilization rate is optimized, the cost is reduced, and the method is particularly suitable for design of large-span bridges and has high practical value.

The embodiment of the invention provides a load balancing control method of a variable pitch system, which comprises the following steps of: continuously acquiring blade root bending moment and rotor azimuth angle signals, accurately preprocessing to obtain 1P harmonic information of bending moment in a flapping direction, and updating accumulated wear conditions of each blade under different azimuth angles in real time based on the 1P harmonic information. According to the method, a dynamic abrasion map is established, the active balance variable pitch offset is actively calculated based on the abrasion map, the load is intelligently guided from a heavily-abraded area to a lightly-abraded area, and a refined blade variable pitch angle is finally formed in combination with traditional IPC correction and a collective variable pitch instruction. In this way, key components such as the variable pitch bearing are prevented from bearing overhigh local stress for a long time in a specific azimuth angle, uniform abrasion of rolling bodies or raceways is achieved, and therefore local fatigue damage is remarkably reduced, and the service life of the variable pitch bearing of the wind generating set and the service life of related components are prolonged.