285 results about "Static force" patented technology

The invention provides a method and system for estimating the vertical bearing capacity of a steel pipe pile, and relates to the technical field of pile foundation engineering.The method comprises the steps that a static cone penetration test is conducted on a seabed stratum needing to be arranged for a steel pipe pile foundation, experimental data are obtained and subjected to normalization processing, soil behavior types are divided, and soil layer mechanical parameters are inverted; calculating side friction resistance and end resistance of the steel pipe pile based on the soil layer mechanical parameters to obtain initial static ultimate bearing capacity; historical equivalent cyclic load experimental data of waves in the construction sea area are obtained, an equivalent cyclic load reduction coefficient, a liquefaction reduction coefficient and a time-varying corrosion reduction coefficient are constructed, and a comprehensive time-varying reduction coefficient is constructed; the initial static ultimate bearing capacity is corrected based on the comprehensive time-varying reduction coefficient, the vertical bearing capacity of the steel pipe pile in the long-term service period is predicted, and the time-varying ultimate bearing capacity is obtained; setting an evaluation threshold according to the time-varying ultimate bearing capacity, dynamically adjusting a bearing capacity grading threshold interval, and outputting a bearing capacity grading evaluation result.

A true triaxial time-dependent dynamic disturbance test device for a deep-buried hard rock includes a rigid static load loading assembly and a rigid dynamic load loading assembly. The rigid static load loading assembly applies a static load to a rock test sample, and the rigid dynamic load loading assembly applies a disturbance stress to the rock test sample. Coupled application and control of a long time-dependent static force and a disturbance stress of the rock in a true triaxial disturbance stress state are achieved. The rigid dynamic load is provided with a disturbance rod in a loading direction, and a “point” disturbance mode is converted into a “face” disturbance mode through the disturbance rod, a disturbance hole and a test sample clamp, so that a disturbance mode more suitable for an actual working condition on site is provided while power consumption is reduced and time-dependent dynamic disturbance is achieved.

The invention relates to the technical field of structural design and strength evaluation of nuclear fusion devices, and discloses an elastic-plastic analysis and strength verification method, device and equipment under multiple working conditions and a medium. Firstly, basic parameters, unit partitions and conditional constraints of a target structure are obtained; next, based on basic parameters, unit partitions and conditional constraints, static nonlinear solution is carried out, a target data set and a load-displacement curve are obtained, different stress stages are abstracted into a continuous gravity loading path, the strength and deformation of multiple working conditions are synchronously evaluated through a set of elastic-plastic analysis process, and the dynamic performance of the gravity loading path is improved. The method is not limited to linear elasticity checking calculation of a single working condition any more, and the actual stress state of the structure is reflected more truly. Then, an allowable gravity amplification factor is determined based on the load-displacement curve. Further, a safety strength elastoplasticity result and a high-risk region are determined based on an allowable gravity amplification coefficient, a target data set, and a load-displacement curve. And finally, based on the high-risk area and a preset reinforcement rule, obtaining a reinforcement scheme.

The invention provides a ballastless track joint performance degradation monitoring method and system, and relates to the technical field of track joint performance monitoring, and the method comprises the steps: knocking a ballastless track plate at a track joint through a force hammer to generate excitation, collecting a vertical vibration acceleration response signal through an acceleration sensor, and synchronously recording the knocking time and static parameters. The vertical vibration acceleration response signal is preprocessed, abnormal pulses and baseline drift are removed, a vibration event sample is formed, and joint mechanics characteristic parameters including a vibration frequency parameter reflecting rigidity degradation and a vibration attenuation parameter reflecting damping are extracted. According to the method, the joint performance evaluation index is calculated in combination with the static parameters, the degradation grade is evaluated after the evaluation index is compared with the preset threshold value, an early warning signal is triggered, the joint degradation grade and position information are provided, and monitoring and evaluation of the joint performance are achieved.

The invention relates to the technical field of beam bridge splicing, in particular to a large-span concrete continuous beam bridge splicing construction method based on intelligent construction. The method comprises the following steps: acquiring digital modeling data of a left bridge and a right bridge to be spliced; analyzing the digital modeling data, and determining the dynamic stress distribution of the whole construction process; acquiring deformation monitoring data in real time, analyzing the deformation monitoring data, and determining a coordinated deformation rule of the left and right bridges; and generating a splicing construction scheme according to the dynamic stress distribution and the coordinated deformation rule. And the decoupling problem of a digital model and a physical entity is eliminated. The problem of stress control blind areas is solved, stress space-time evolution is quantified, it is ensured that stress prediction covers all stages of construction, and the blind areas of a conventional static model are avoided. The problem of quantitative deficiency of the coordination deformation rule is solved, and the defect of neglecting the deformation coordination is avoided. The problem of construction decision lag is solved, the structural damage probability and temperature cracks are reduced, and coupling of construction execution and a physical mechanism is ensured.

The invention discloses a structural vibration reduction topological optimization design method based on anti-resonant frequency constraint. The method comprises the following steps: constructing a finite element model corresponding to structure parameters; obtaining an initial structure and an optimization column formula according to the finite element model; obtaining an objective function value through finite element analysis; obtaining an anti-resonance frequency correlation characteristic value through generalized asymmetric characteristic value analysis; and the design variables are updated in combination with optimization column constraints, and a topological optimization design configuration is obtained after convergence judgment. According to the method, explicit calculation and precise control of the dynamic compliance anti-resonant frequency are achieved, optimization and advanced convergence are avoided through anti-resonant frequency constraint, a clear vibration reduction topological configuration can be obtained under high-frequency excitation without additional mass, the vibration reduction performance and the static force bearing capacity of the structure are both considered, and the method is suitable for large-scale popularization and application. And the design requirements for light weight and high vibration attenuation of the structure in the fields of aerospace and the like are met.

The invention relates to the technical field of robots, in particular to a rolling contact type continuum mechanical arm with a symmetrical structure and a statics modeling method thereof, the rolling contact type continuum mechanical arm comprises a plurality of rolling joints which are connected in sequence, and the rolling joints comprise one-degree-of-freedom joints and two-degree-of-freedom joints; the one-degree-of-freedom joints and the two-degree-of-freedom joints are alternately stacked, and every two adjacent rolling joints are connected in a rolling contact mode; the one-degree-of-freedom joint and the two-degree-of-freedom joint are each provided with a wire passing hole, and a driving cable is arranged in each wire passing hole in a penetrating mode. The continuum mechanical arm is of a symmetrical structure, the tail end of the continuum mechanical arm is provided with the most complete working space, and the problem that the working space at the tail end of an existing continuum mechanical arm has defects is solved; according to the static modeling method for the rolling contact type continuum mechanical arm, the problem that static analysis of rolling joints of different structures is inconsistent is solved, and the problem that calculation is complex due to the fact that integral terms exist in a traditional beam theoretical model is solved.

The invention belongs to the technical field of bridge engineering, and particularly relates to an analysis method for intelligently sensing a hanging basket of a corrugated steel web box girder bridge, a terminal and a storage medium, and the method comprises the steps: obtaining deformation data of a plurality of measurement points installed on the hanging basket of the corrugated steel web box girder bridge in an actual asynchronous method construction process; establishing an initial finite element model based on the geometric information of the hanging basket structure, and setting an elastic constraint condition at each support position of the initial finite element model; according to the invention, the static level gauge, the inclinometer and the strain gauge are arranged at the key positions of the hanging basket to construct a multi-source sensing monitoring network, so that the cooperative sensing of the vertical displacement, the inclination attitude and the structural strain is realized, and the comprehensiveness and accuracy of the state sensing in the construction process are effectively improved. Secondly, a vertical spring unit is introduced into the finite element model to serve as elastic constraint, the vertical compression deformation behavior of the corrugated steel web under the load effect is truly simulated, and the physical authenticity of boundary conditions is remarkably improved.

The utility model discloses a vertical vibration reduction support based on piezoelectric energy consumption for bridge engineering, which comprises a base plate, a lower seat plate arranged in the base plate, a middle seat plate arranged on the lower seat plate, an upper seat plate arranged on the middle seat plate, and a vibration reduction disc arranged in the base plate and used for vertical vibration reduction. The upper end of the damping disc makes contact with the lower seat plate, a piezoelectric energy dissipation assembly is arranged between the damping disc and the base plate, the damping disc is in an arch shape, the arc face of the damping disc is connected with the pressure bearing block, and the plane of the lower end of the pressure bearing block is connected with the piezoelectric energy dissipation assembly. The vibration reduction disc is made of a spring steel material and adopts an arch-shaped structure, so that stable vertical support can be provided for an upper structure under the action of static force. Vibration reduction and energy consumption of the vertical support are achieved through the piezoelectric energy consumption assembly, the piezoelectric energy consumption assembly converts high-frequency vibration mechanical energy of the support into electric energy through the two piezoelectric ceramic plates, the energy consumption efficiency is high, the working temperature range is wide, and the adaptive capacity is high.

The invention belongs to the technical field of low-frequency vibration control, and discloses a low-frequency low-damping tuned mass damping device which is mainly composed of a rigid support, a first sling, a rotating arm, a cable hole, a first arc guide groove, a second arc guide groove, a lock pin, a second sling, a first mass block, a spring, a second mass block and a damping element. The flexible suspension rotation replaces the bearing or ball screw support, so that the damping is obviously reduced; the long rotating arm is combined with the equivalent large-diameter arc guide groove, so that the low-frequency low-damping tuned mass damping device can achieve large vertical displacement at a small rotating angle, and damping is reduced. The low-frequency low-damping tuned mass damping device innovatively adopts double-mass-block configuration, so that static force borne by a spring is generated by mass difference, and static deformation of the spring is remarkably shortened. According to the method, low-frequency operation can be achieved under the condition that the space is limited, the low-damping characteristic is kept, it is guaranteed that the requirement for the optimal damping ratio is met, and therefore a new technical approach is provided for control over low-frequency vortex vibration of a large-span bridge.

The invention relates to a rotor six-force-element loading method and device for a static test of a tilt-rotor aircraft. The testing device comprises a rack, a plurality of fixed pulleys installed on the rack, a motor fake part fixedly connected with a to-be-tested machine arm, a connecting rod system fixedly connected with the rotating end of the motor fake part, and a rope system, wherein one end of the rope system is connected with the connecting rod system, and the other end of the rope system penetrates through the fixed pulleys in a winding mode and then is used for loading a test load. The rack is provided with a test position used for placing a to-be-tested machine arm. A to-be-tested vehicle arm is installed on the motor fake part through a bolt. The weight is placed at the tail end of the rope, the function of loading a specified load is achieved, and then the purpose of checking the strength of the arm is achieved. The tilt-rotor aircraft arm rotor six-force-element static test device realizes tilt-rotor aircraft arm rotor six-force-element static test, is convenient and simple to operate, and is flexible and adjustable in loaded load.

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 application provides a machine tool spindle tension and compression static force loading mechanism and method, which comprises a workpiece shaft connecting part used for being matched to a workpiece shaft of a machine tool, a tool shaft connecting part used for being matched to a tool shaft of the machine tool, a telescopic adjusting part telescopically arranged between the workpiece shaft connecting part and the tool shaft connecting part, and a sensor arranged on the telescopic adjusting part and used for measuring the force between the workpiece shaft connecting part and the tool shaft connecting part when the telescopic adjusting part is elongated or shortened. The application with the above structure only needs to correspondingly install the tool shaft connecting part and the workpiece shaft connecting part on the tool shaft and the workpiece shaft of the machine tool, then elongates the telescopic adjusting part to apply the compression force to the workpiece shaft and the tool shaft or shortens the telescopic adjusting part to apply the tension to the workpiece shaft and the tool shaft, and accurately obtains the data through the sensor, so as to measure and judge the tension and compression performance of the workpiece shaft and the tool shaft.

The invention provides a device and a method for testing the shearing and compression performance of a helicopter engine damping part. The shearing performance testing device comprises a base (1), a fixed support (3), a stress application lead screw (4), a tension sensor (5), a dynamometer (6), a double-fork (7), an arc-shaped pulling plate (8), a mounting support (10), a dial indicator (11) and a magnetic base (12). The compression performance testing device comprises a base (1), a fixed support (3), a stress application lead screw (4), a tension sensor (5), a dynamometer (6), a mounting support (10), a dial indicator (11), a magnetic base (12), a single lug (13) and a square loading frame (14). Measurement of shear and compression deformation displacement of the engine damping member is realized, shear and compression performance of the engine damping member is verified, and the installed damping member is ensured to effectively prevent transmission of vibration waves and weaken harm of inertial impact to an engine. And the situation that the installation of the damping piece with substandard static performance affects the flight safety is avoided. The test cost is low, the operation is simple, the test efficiency is high, and the deformation displacement of the damping member can be visually reflected.

The present application provides a steel pipe pile vertical bearing capacity estimation method and system, relates to the field of pile foundation engineering technology field, the present application carries out static sounding test to the seabed stratum required to be set for the steel pipe pile foundation, obtains experimental data and carries out normalization processing, divides the soil behavior type, and inverts the soil layer mechanical parameter; based on the soil layer mechanical parameter, the side friction and the end resistance of the steel pipe pile are calculated, and the initial static ultimate bearing capacity is obtained; the historical equivalent cyclic load experimental data of the construction sea area wave are obtained, the equivalent cyclic load reduction coefficient, the liquefaction reduction coefficient and the time-varying corrosion reduction coefficient are constructed, and the comprehensive time-varying reduction coefficient is constructed; based on the comprehensive time-varying reduction coefficient, the initial static ultimate bearing capacity is corrected, the vertical bearing capacity of the steel pipe pile in the long-term service period is predicted, and the time-varying ultimate bearing capacity is obtained; according to the time-varying ultimate bearing capacity, the evaluation threshold is set, the bearing capacity classification threshold interval is dynamically adjusted, and the bearing capacity classification evaluation result is output.

The invention discloses a hinged assembly type anchor cable frame beam internal force deformation analysis method, and relates to the technical field of slope supporting structure internal force deformation analys.The hinged assembly type anchor cable frame beam structure is divided into a plurality of supporting beams and a plurality of connecting beams, and according to static balance conditions and deformation coordination conditions of cross joints and hinge joints, the deformation of the cross joints and the hinge joints is optimized; constructing and solving a linear equation set on the basis of a Winkler foundation model to obtain concentrated force and beam end shearing force of each strut beam acting on a cross node and beam end shearing force of each connecting beam, and then performing internal force deformation analysis on each section of beam body on the basis of the Winkler foundation model; according to the method, static balance conditions and deformation coordination conditions at the cross nodes and the hinge points are considered, so that the calculation precision is improved, deformation conditions and continuity conditions increased due to the existence of the hinge points in the structure are reduced, the structural analysis difficulty is simplified, and structural calculation is facilitated.

The invention discloses a cylindrical roller modification method based on a non-uniform rational B-spline curve, and relates to the technical field of bearing design. According to the method, a bearing contact mechanical model considering the roller modification effect is constructed, a modification contour is constructed based on a non-uniform rational B-spline curve (NURBS curve), an optimization model with the basic reference rated life of a bearing as a target function is established on the basis of meeting geometric constraint conditions, and an optimization algorithm is adopted for solving to obtain a final modification curve. The established contact mechanical model comprises a bearing static balance model and a roller-raceway contact mechanical model and is used for calculating load distribution and contact stress under the unbalance loading working condition. Compared with a traditional symmetrical logarithmic modification method, the problem that the axial stress of the roller is not uniform under unbalance loading can be effectively solved, the uniformity of contact stress distribution is improved, and the fatigue life of the bearing is prolonged.

The invention discloses a method and a system for testing release intention response characteristics in a man-machine handover task of a collaborative robot, and belongs to the technical field of robot performance test and evaluation. Comprising the steps of controlling an end effector of a tested robot to clamp a standard test load and keeping the standard test load at a preset position; external traction force monotonically changing along with time is applied to the load through an external traction device; an original time domain signal of external traction force is collected in real time, and a driving current signal of a tail end joint of the robot is synchronously collected; filtering the collected signals, and calculating intention trigger impulse; based on the time difference of the traction force peak moment, the driving current sudden change moment and the load physical separation moment, the cascade lag time is solved; and based on the intention trigger impulse and the cascade lag time, generating a quantitative index representing the dynamic release performance of the robot. According to the method, the problem that the existing test only pays attention to the static force threshold and ignores the dynamic process characteristics is solved, and objective and quantitative evaluation of the robot release intention response characteristics is realized.

The application discloses a static pressure hole guiding device, which comprises a pipe body and a force transmission assembly for connecting the pipe body with a clamping mechanism of a static pressure pile machine so that the pipe body bears the downward static pressure of the static pressure pile machine, and the lower part of the pipe body is in a hollow structure. The application also provides a pile sinking construction device and a construction method for static pressure pile sinking construction by using the pile sinking construction device. The static pressure hole guiding device, the pile sinking construction device and the pile sinking construction method have the advantages that the static pressure hole guiding device works by the static pressure hole guiding principle, does not need large spiral drilling machines, does not need special static pressure pile planting machines with specific functions, and can be used by using ordinary conventional static pressure pile machines on site, so that the construction process is simple, environment-friendly, low in cost, and convenient for adopting the middle hole post-grouting method, the static pressure hole guiding device can be widely applied to the pile sinking construction of various types of pipe piles commonly used in civil construction engineering, the pile quality is high, and the application prospect is good.

The utility model relates to the technical field of foundation pit supporting, in particular to a supporting structure for foundation pit excavation. The supporting structure for foundation pit excavation comprises steel sheet piles pressed into a foundation pit to be excavated in a static force mode, the steel sheet piles are supported and fixed through transversely-arranged I-shaped steel, the I-shaped steel is divided into transversely-arranged steel and longitudinally-arranged steel which are horizontally arranged and vertically arranged, the number of the transversely-arranged steel is two, and the number of the longitudinally-arranged steel is two. The longitudinal steel and the transverse steel are used for abutting against the inner walls of the steel sheet piles correspondingly, and the longitudinal steel abuts against the transverse steel; due to the fact that the I-shaped steel composed of the transversely-arranged steel and the longitudinally-arranged steel and used for supporting the steel sheet piles is designed for the supporting structure, long-term supporting operation of the foundation pit can be achieved through the I-shaped steel and the steel sheet piles, the self weight of the I-shaped steel can be reduced through the transversely-arranged steel and the longitudinally-arranged steel, and natural sedimentation of the supporting structure is slowed down; the problems that in the prior art, a temporary retaining wall is used as a foundation pit supporting structure, deformation, displacement and the like are prone to occurring in the face of long-term supporting engineering, and foundation pit safety is affected are solved.

The invention provides a stratum advanced static sounding mixing pile linkage device and a construction method, relates to the field of advanced detection, and aims to solve the problem that a probe is damaged or the detection precision is influenced due to counterforce when the counterforce of a soil body under a complex geological condition is dealt with in mixing pile construction. A linkage device comprising a pile casing, a probe and a stabilizer bar is adopted, one end of the stabilizer bar is rotationally connected with the pile casing, the other end of the stabilizer bar is connected with the probe, and a stop piece is mounted on the outer circumferential surface of the stabilizer bar, so that the stabilizer bar can resist torsion stress of the probe driven by a drill rod during operation of the mixing pile machine to a certain extent, and the probe can keep soil counterforce; the static pressure of the probe is stabilized to be downward, a rotating component forming a stirring pile is rotated downwards, the static pressure of the probe for monitoring soil parameters is downward, association between the rotating component and the probe in the operation process is achieved, the risks of displacement, deformation or damage of the probe caused by counter force are reduced, and the requirements for stability and data accuracy are met. Therefore, the precision and reliability of the probe are guaranteed.

The present application relates to the technical field of fitness equipment, in particular to a fitness action detection guiding robot, which comprises a frame, the frame surrounds a space for performing fitness actions, a horizontal bar is slidably installed on the frame in the vertical direction, a constant resistance unit for increasing static load of the horizontal bar by applying unidirectional rotation resistance is arranged on the bottom of the frame and connected with the horizontal bar, a reset device for pulling down the horizontal bar is arranged in the constant resistance unit, a hovering unit for controlling safe hovering of the horizontal bar is arranged on the frame, and a data processing unit for indirectly detecting force time and force amplitude of weight lifting actions is arranged on the frame. The structure for converting linear motion into rotary motion is arranged on the horizontal bar, the constant resistance unit is arranged on the rotary motion structure, the simulation of core strength training of fitness actions is realized, and the constant resistance unit only applies unidirectional static load to the horizontal bar, thereby avoiding the risk of straining or crushing the user of the horizontal bar.

The application discloses a wheel fatigue life prediction method based on a rolling contact fatigue simulation technology, and comprises the following steps: establishing a finite element model of a wheel-axle-rail, performing grid encryption on a wheel-rail contact area, and performing static strength checking to obtain an initial finite element model meeting static force requirements; establishing a wheel-rail rolling contact model based on the initial finite element model, describing rolling motion of the wheel by using a hybrid Lagrangian / Eulerian description or a co-rotating coordinate system, and applying a wheel non-circularity excitation spectrum in explicit dynamics analysis to calculate a dynamic contact stress field under different axle loads and friction coefficients; and based on the dynamic contact stress field, a multi-axle fatigue damage model is used in combination with a linear cumulative damage criterion to calculate fatigue life, and an abrasion correction coefficient and a residual stress correction coefficient are introduced to correct the calculation results. The application significantly improves the prediction accuracy of fatigue defects such as wheel peeling, cracking and polygonization.

This invention discloses a method for evaluating the load-bearing state of radial rollers in a tunnel boring machine (TBM) main bearing. Based on the crowning characteristics of the radial rollers in the TBM main bearing, this invention determines the roller crowning clearance, establishes and solves static equilibrium equations, overturning moment equilibrium equations, and radial displacement relationship equations. By summing the radial displacement values, the contact deformation of the rollers in the bearing is obtained. The radial displacement records of the rollers in the bearing are measured under actual radial force and overturning moment conditions. The load-bearing state of the rollers is evaluated by comparing the magnitudes of the roller contact deformation and radial displacement records. This evaluation method can more accurately detect the specific locations of potential risks inside the bearing, providing technical guidance for the monitoring and diagnosis of bearing rollers and ensuring the operation and maintenance of TBM bearings.

The utility model discloses a static crushing device for pile head of bored pile, include: outer sleeve, the tubular setting of circular, and for inserting into the pile head, pressure bar, the vertical insertion of cylindrical in outer sleeve, break the needle, horizontal sliding connection in pressure bar, and along its circumferential direction even distribution, be provided with the sliding hole of break the needle and set up for in outer sleeve, drive mechanism is used for controlling break the needle synchronous horizontal slip. The utility model has the advantages and effects that: through setting the outer sleeve that inserts into the pile head, and setting pressure bar in the outer sleeve, make break the needle of telescopic in pressure bar can penetrate the outer sleeve, and exert pressure to the inside of the pile head, adopt static pressure and realize the crushing of the pile head from inside to outside, the whole process is low in noise, and the degree of pollution is low, and convenient simultaneously fast, effectively improve the construction efficiency.

The invention relates to the technical field of damping of hoisting machinery structures, in particular to a self-adaptive damping system of a tower crane driven by tension of a hoisting steel wire rope, which comprises a swing base mounted on a balance arm, an arc track assembly is arranged on the swing base, and a movable mass block assembly is arranged in the arc track assembly. A tension actuating mechanism is connected between the lifting steel wire rope and the swing base, and a damping mechanism is hinged between the balance arm and the mass block assembly. The posture switching of the swing base is automatically driven by the tension of the lifting steel wire rope, an additional power source is not needed, and the response is quick; the arc track assembly replaces a traditional long simple pendulum with an arc structure, and the problem that the vertical installation space of the tower crane is limited is solved. The mass block assembly has the balance arm counterweight effect and the static balance and dynamic vibration reduction functions, and the structural load and cost are reduced; the damping mechanism efficiently dissipates vibration energy, self-adaptive vibration reduction is cooperatively achieved, and the dangerous bending moment and amplitude of the tower body are effectively reduced.

This invention discloses a method for tooth profile modification and modeling of a logarithmic spiral live gear transmission, belonging to the field of mechanical transmission technology. The method includes: modifying the tooth profile of the moving tooth tip using circular arc curves or higher-order polynomial curves to obtain a modified moving tooth profile; modifying the profiles of the long axis transition section and the short axis transition section of the cam using higher-order polynomial curves to obtain a modified cam theoretical profile; obtaining the modified internal gear profile based on the motion mapping relationship between the modified moving tooth and the cam; establishing a static balance model to analyze the influence of modification parameters on contact force under working conditions; and establishing a three-dimensional model of the logarithmic spiral live gear transmission. This invention can significantly improve meshing accuracy and transmission smoothness, improve tooth profile contact stress distribution, enhance load-bearing capacity and fatigue resistance, and also provide feasible parameter guidance for actual production.

According to the in-vitro inhaul cable span expansion structure and method, the newly-arranged steel columns are connected between the upper-layer existing beams and the lower-layer existing beams of the to-be-expanded span area, and the upper-layer existing beams and the lower-layer existing beams of the to-be-expanded span area are supported through the new supports; the first to-be-disassembled section of the to-be-disassembled support is statically cut off step by step while the prestress is tensioned step by step, and the second to-be-disassembled section of the to-be-disassembled support is statically cut off after the prestress tensioning is completed and the structural deformation is stable; the transformation effects that the influence on an existing structure is extremely small, the amplitude of span expansion can be extremely large after transformation, construction is extremely convenient and fast, and the manufacturing cost is extremely low can be achieved.

The invention discloses a wind power blade subcomponent structure bending torsion loading failure analysis and optimization method, and belongs to the technical field of wind power blade structure mechanical analysis. The analysis method comprises the following steps: establishing a three-dimensional entity finite element model of a wind power blade sub-component, applying pure shimmy, pure torsion and gradient bending-torsion combined load to carry out nonlinear static analysis, extracting critical failure point data, and comparing and analyzing a rear edge buckling waveform, bonding failure migration and contact behavior change, so as to obtain a critical failure point. According to the method, the internal relation of blade rear edge bonding structure failure, buckling waveform and contact behaviors under the bending-torsion coupling working condition is defined, the migration rule of the rear edge failure position along with the torsion angle and the stress distribution difference between the front edge and the rear edge are defined, and the problem that in the prior art, it is difficult to accurately position the blade vulnerable area under bending-torsion coupling is solved; and a mechanical basis is provided for blade structure optimization. The analysis result obtained through the analysis method can be directly used for guiding the anti-bending coupling design of the blade.

The invention discloses an assembly type pile structure quasi-static test system and device. The assembly type pile structure quasi-static test system comprises a model box arranged on one side of a reaction wall. The pile structure model inserted into the inner side of the model box comprises a model main body, a model seat, a left insertion column and a right insertion column which are of an integrated structure, and the left insertion column and the right insertion column are both inserted into soil on the inner side of the model box; according to the fabricated pile structure quasi-static test system and device, by designing a rotary quick connection structure between the vertical force loading cross beams of the model, the stability of the vertical force loading cross beams above is effectively improved, displacement and falling of the cross beams in the test process are avoided, stable proceeding of the test is guaranteed, and the test efficiency is improved. Meanwhile, the subsequent rapid disassembly and assembly of the vertical force loading cross beam are facilitated, and the test convenience is improved; and an auxiliary limiting structure is designed between the rubber support and the model, so that the stability of the rubber support in a test is ensured, and a reliable basic supporting condition is provided for the test.