512 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.

The invention discloses an integral equation general solution method for horizontal bearing characteristics of a pile body composite foundation, which comprises the following steps of: S1, establishing a pile body composite foundation schematic diagram consisting of N (N = n1 * n2) foundation piles and a coordinate system {0, x, y, z} thereof, and dividing the pile body composite foundation schematic diagram into m subunits by taking a pile diameter d as a side length; determining the load resultant force V (y, 0) of the top of each subunit according to the horizontal load H0 of the upper structure borne by the foundation; s2, the pile-soil system is decomposed into semi-infinite space expansion soil and virtual pile units, and stress analysis schematic diagrams of the corresponding units are obtained; obtaining analytic expressions of pile body deflection # imgabs0 # and bending moment # imgabs1 # according to static equilibrium conditions and geometric conditions of the ith (i = 1,..., N) virtual pile unit; and S5, the lateral displacement # imgabs2 # of the extended soil unit at the corresponding position of the ith virtual pile is obtained based on the Mindlin solution, according to the lateral displacement coordination condition of the semi-infinite space extended soil and the virtual pile unit at the corresponding position, an integral control equation of the horizontal bearing characteristic of the pile body composite foundation is established, and then the pile body deflection and the internal force of the pile body composite foundation are obtained.

The present invention discloses a method for predicting the static behavior of a bridge based on dynamic loading, comprising the following steps: establishing a full-bridge structural analysis model according to the design data of the existing bridge; conducting dynamic loading tests on the existing bridge to obtain the bridge dynamic response values; performing sensitivity analysis on each design parameter in the initial structural analysis model to obtain and determine the key design parameters to be corrected that affect the bridge structure; based on the uniform design sampling method, using machine learning intelligent algorithms, constructing training samples of the key design parameters to be corrected and establishing a surrogate prediction model; correcting the initial structural analysis model using the prediction results of machine learning and intelligent algorithms; predicting the static behavior of the bridge based on the corrected structural analysis model; introducing an error analysis method to evaluate the prediction results of the bridge static force. The beneficial effects of the present invention are: reducing the cost of the bridge static load test, reducing the damage to the bridge's own structure, and having high prediction result accuracy.

The invention relates to the technical field of traffic infrastructure maintenance, and particularly discloses a method for evaluating the anti-collision toughness of a rusted steel bar bridge structure after ship collision, and the method comprises the following steps: firstly, building a rusted bridge pier finite element model based on a rusted steel bar concrete theoretical degradation model; simulating ship collision by adopting an equivalent static method, and determining dynamic damage factors of the ship; structural nonlinear static analysis and nonlinear dynamic analysis are conducted by considering sudden external force to obtain a bridge function loss function, and then a bridge function is calculated; constructing a response surface agent model to perform dynamic response prediction; determining a bridge structure damage state judgment criterion; the vulnerability of the rusted bridge is calculated through Monte Carlo simulation; and according to the bridge function loss function, combining the repair time and the recovery function to calculate a structure anti-collision toughness index. The method provided by the invention fills up the blank of ship collision resistance toughness evaluation of the coastal rusted bridge pier, provides a scientific basis for bridge safety evaluation and maintenance decision, and is of great significance for guaranteeing safe operation of the bridge.

The present invention belongs to the technical field of impact tests, and particularly relates to a catapult take-off and arrested impact test apparatus, comprising a supporting frame, an auxiliary supporting and guiding apparatus above the supporting frame, a mounting base below the supporting frame, a servo actuator, an oil circuit system, and a control and measurement system. The oil circuit system comprises an oil source, a low-pressure accumulator group, a high-pressure accumulator group, an oil inlet valve block, an oil return valve block, a servo valve block, an oil source low-pressure oil return pipe, an oil source high-pressure oil outlet pipe, and necessary tubes among components. The control and measurement system comprises a vibration and impact loading upper computer, a vibration impact controller, a static loading upper computer, a hydraulic servo controller, a servo valve, and an accelerometer. The servo actuator is internally provided with a displacement sensor. The present invention can be widely applied to conventional vibration and impact tests of various suspension launch apparatuses in a suspension-mounted state, as well as arrested impact tests under composite waveforms.

The invention discloses an accelerated test method and device for precision retentivity and reliability of a numerical control milling head, and relates to the technical field of mechanical tests. The test device comprises a numerical control milling head, a vibration loading device installed below the numerical control milling head, a follow-up dynamic / static force loading device installed above the vibration loading device, a lifting supporting device installed on the outer side of the follow-up dynamic / static force loading device, and an operation table installed on one side of the vibration loading device. The method comprises the following steps: installing and positioning the numerical control milling head into the high and low temperature loading device, and adjusting the spatial height of the numerical control milling head to reach a preset position; carrying out stress combined loading tests of temperature, vibration, speed, static / dynamic force and electromagnetism on the tested numerical control milling head; various precision degradation data and fault data of the numerical control milling head are measured and recorded; and the precision retentivity and the reliability level of the numerical control milling head can be quickly obtained in a short time.

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 discloses an eccentric quasi-static loading device for the structural rigidity of an existing brick masonry and a testing method, and relates to the technical field of quasi-static loading testing of the brick masonry, the eccentric quasi-static loading device comprises a loading pedestal, a loading assembly is arranged above the loading pedestal, a load distribution assembly is arranged above the loading assembly, and the loading assembly is connected with the loading pedestal. The reaction walls are arranged at the two ends of the load distribution assembly and the two ends of the loading assembly, the loading assembly is connected with the reaction wall on one side, the portal is arranged between the reaction walls on the two sides, and the portal is connected with the load distribution assembly. By the adoption of the existing brick masonry structure rigidity eccentric pseudo-static loading device and the testing method, the authenticity of the load condition in the simulated wall pseudo-static test process in the test is guaranteed, the vertical load loading position is adjusted and refined, the load applying mode is optimized, the loading device is adjusted, and the test efficiency is improved. The influence of a vertical load on a horizontal dynamic load is reduced, and the overall precision of the test is improved.

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

The invention discloses a hydraulic static automatic pile driver and aims to provide a hydraulic static automatic pile driver which is good in structural stability and capable of effectively solving the problem that a piston rod of a pile-embracing oil cylinder in the prior art is prone to distortion and deformation. The hydraulic static force automatic pile pressing machine can effectively solve the problem that in the pile pressing process, due to the fact that the holding force is insufficient, a pressed pile slips. The device comprises a reaction frame, a hydraulic jack and a pile embracing mechanism, the pile embracing mechanism comprises a pile embracing taper sleeve, an inner hole of the pile embracing taper sleeve is a taper hole, the hydraulic jack drives the pile embracing taper sleeve to ascend and descend, and the lower end of the pile embracing taper sleeve is connected with a bottom cover; the plurality of enclasping cone cores are arranged in the cone holes; the hydraulic elements are in one-to-one correspondence with the enclasping cone cores and comprise vertical piston cavities arranged in the corresponding enclasping cone cores; the locking piston is arranged in the vertical piston cavity and divides the vertical piston cavity into an upper cavity and a lower cavity, the lower end of the locking piston is connected with a piston rod, and the lower end of the piston rod can be connected to the bottom cover in a manner of moving in the radial direction of the conical hole.

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 provides a hydraulic control pilot two-stage flow distribution static balance radial plunger hydraulic device and a working method, and relates to the technical field of radial plunger hydraulic devices. According to the scheme, the radial plunger hydraulic device is balanced through hydraulic control pilot two-stage flow distribution static force, flow distribution is controlled through external control pilot pressure, bidirectional rotation of a hydraulic pump motor and self-compensation after a valve plate is abraded are achieved by arranging an external control pilot oil way, and the service life is prolonged. In addition, by arranging the regular polygon driving type structure, regular polygon parts are additionally arranged between the crankshaft and the plunger, the transmission performance of the radial plunger pump is optimized, and friction force is reduced. By arranging the guide sleeve, the rubber cavity assembly and the return spring, the movement centering performance of the plunger can be effectively improved, leakage at the position of the plunger unit is reduced, and the complexity of the motor return device is simplified.

The present invention proposes a test and detection method for an overload protection type viscous damper, the method comprising the following steps: adopting a static loading test, controlling the loading unit of the test machine to make the overload protection type viscous damper to be tested move at a uniform speed, and recording the limit displacement value of the reciprocating motion of the damper; setting a total of four independent tests, respectively testing at three speed gears and corresponding test displacements, the test speed and test displacement in the first test are consistent with the parameter settings in the last test. By adopting a static loading test and uniform motion control, the actual working state of the damper can be accurately simulated, the accuracy and representativeness of the test results can be improved, and by comparing the maximum output deviations of the first and fourth tests, the durability and consistency of the damper can be effectively evaluated to ensure its reliability in long-term use.

The invention relates to the technical field of rope saw cutting devices and cutting processes thereof, and particularly discloses a static force dismantling rope saw cutting device and a cutting process thereof. Which comprises a diamond wire sawing machine and a diamond wire saw matched with the diamond wire sawing machine, and is characterized by further comprising a bracket, a walking mechanism and positioning mechanisms, the walking mechanism is arranged on the bracket, the diamond wire sawing machine is arranged on the walking mechanism and driven by the walking mechanism to move on the bracket, and the positioning mechanisms are symmetrically arranged at one end of the bracket; the guide wheel mechanism is matched with the diamond wire saw to guide the diamond wire saw; on one hand, equipment is limited through the positioning mechanism and is stabilized at the set position, cutting is facilitated, cutting accuracy is improved, on the other hand, the height of one end of the bracket can be adjusted through the screw, the heights of the two ends of the bracket are consistent, and the bracket is in a horizontal state; in this way, the cutting accuracy is not affected when the diamond wire sawing machine moves.

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 relates to a test device and method for researching horizontal load of a suction bucket under high compactness of sandy soil. The device comprises a model box, a suction bucket model system, a suction bucket mounting and up-pulling system and a horizontal loading and measuring system. A high-compactness sandy soil sample is prepared and contained in the model box. The suction bucket model system simplifies sensor arrangement and reduces penetration resistance. And the suction bucket mounting and upward pulling system realizes mounting and pulling of the suction bucket by utilizing a hydraulic oil cylinder and a lifting cross beam. The horizontal loading and measuring system applies static force and dynamic load through a pulley, a steel wire rope, a servo motor and a balancing weight to form sinusoidal waveform bending moment, simulates the real stress condition and measures the horizontal displacement and inclination angle change of the suction barrel. According to the device, a loading system is optimized, the reliability and precision of test data are improved, the cost is reduced, and the device is suitable for safety and stability research of an ocean engineering structure.

The invention discloses a lock assembly, a mounting bracket, a battery and a power utilization device, and the lock assembly comprises a mounting seat which comprises a first locking wall surface, and the first locking wall surface is provided with a lock pin through groove; the first locking piece is arranged on the mounting seat along the first rotating shaft, the first locking piece comprises a first matching part and a clamping groove, and the plane passing through the axis of the first rotating shaft is a first plane; the second locking piece is rotatably arranged on the mounting seat along a second rotating shaft, the second locking piece comprises a second matching part, and the plane passing through the axis of the second rotating shaft is a second plane; and when the first matching part is matched with the second matching part, the overlapping area A of the projections of the clamping groove and the lock pin through groove in the direction perpendicular to the first locking wall surface is located between the first plane and the second plane. Therefore, the gravity of the battery is shared by the first locking piece and the second locking piece, the difference between the shared force of the first rotating shaft and the shared force of the second rotating shaft can be reduced, the static load resistance of the lock assembly is improved, and the service life of the lock assembly is prolonged.

The invention provides a shear wall quasi-static test device and test method, and relates to the technical field of quasi-static tests. The device comprises a supporting stand column, a loading beam, a guide beam, a counter-force frame, a magnetic component, a counter-force beam, a vertical actuator, a horizontal actuator, a connecting beam, a shear wall to be tested, a magnetic plate, a force transmission frame and other components, wherein the components are connected in a specific mode. The device is simple in structure and convenient in test operation, the magnetic plates are mounted on the loading beam and the test device, and the principle that like poles of the magnets repel is utilized, so that no friction force is generated between the shear wall and the quasi-static test device under the condition of no contact, and the accuracy of the quasi-static test of the shear wall is ensured.

The utility model belongs to the technical field of ocean engineering, and provides an ocean in-situ multi-parameter testing device, a probe unit comprises a static sounding testing unit and a lateral pressure loading testing unit, the static sounding testing unit and the lateral pressure loading testing unit are sequentially installed from bottom to top, and the outer diameter of the lateral pressure loading unit is slightly larger than that of the static sounding testing unit. The acquisition module is used for acquiring stratum engineering mechanical parameters; according to the utility model, the probe unit is specifically structured and serves as a core measuring part of the OCPMT, the probe unit continuously penetrates into the stratum under the propelling action of the propelling unit, and in the penetrating process, the conical tip resistance, the side friction resistance and the pore water pressure are collected in real time, and a continuous stratum characteristic profile is obtained; and after penetration is in place, the lateral pressure loading unit applies lateral force to the stratum, the stress-strain value of the surrounding stratum is measured in real time, and engineering mechanical parameters of the stratum are obtained.

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 utility model belongs to the field of multi-field coupling tests, and particularly relates to a pure bending stress simulation-sound load-vibration combined loading test device. The device comprises a high-sound-intensity traveling wave tube, a static force loading module, a vibration table and a test piece, and the high-sound-intensity traveling wave tube is provided with an opening for accommodating the test piece; the static force loading module is mounted on the vibration table and is used for performing static force loading on the test piece; one end of the test piece extends into the high-sound-intensity traveling wave tube from the opening, and the other end of the test piece is connected with the static force loading module. According to the pure bending stress simulation-sound load-vibration combined loading test device disclosed by the invention, a set of new test device capable of simultaneously simulating pure bending stress, strong noise and strong vibration load is designed based on a four-point bending static loading mode on the basis of a traditional multi-field coupling test device; finally, the pure bending stress simulation-sound load-vibration combined test of the thermal protection structure test piece is realized.

The invention provides a performance testing device and method for an aero-engine installation joint, the device comprises a static force loading device, a test piece clamping device and a combustion device, the static force loading device is used for applying static force to the installation joint, the test piece clamping device is used for clamping the installation joint, and the combustion device is used for performing flame impact on the installation joint. According to the invention, the performance of the aero-engine installation joint can be tested.

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 utility model discloses a static force pull-down loading reversing device, and belongs to the field of blade static force testing. The transverse beam moves between the static force loading mechanism and the blade clamping mechanism in the direction perpendicular to the rope, the installation seats are fixed to the two ends of the transverse beam and used for being connected with a workshop ground rail, and first bolts used for fixing the installation seats to the workshop ground rail are arranged on the installation seats. A base is fixedly installed at the end, away from the installation base, of the cross beam, a second bolt used for fixing the base to the cross beam is arranged on the base, and the end, away from the cross beam, of the base is movably connected with a pulley assembly used for allowing the rope to penetrate through. The static pull-down loading reversing device can change the loading direction, has the advantages of being good in stability, convenient to disassemble and assemble, high in adaptability and high in adjustability, and is beneficial to improving the use efficiency and safety of equipment.

The invention provides a numerical simulation method and system for a high-strength energy-absorbing supporting system, and belongs to the technical field of underground engineering supporting. According to the scheme, the tensile test stress process of a high-strength energy-absorbing anchor rod or anchor cable is divided into an elastic stage, a constant resistance stage, a fracture stage and a failure stage; by combining constitutive equations and mechanical parameters obtained by an anchoring test and a static tensile test of the high-strength energy-absorbing anchor rod or anchor cable, the problems that in the prior art, when a structural unit is adopted to simulate the anchor rod and the anchor cable, even if the rod body reaches the ultimate elongation, the rod body cannot be broken, and the mechanical characteristics of the anchor rod and the anchor cable cannot be finely simulated can be effectively solved; by adopting the entity unit to construct the numerical model of the high-strength energy-absorbing supporting column, simulation of large deformation and energy absorption of the supporting column can be effectively achieved, then numerical simulation of a high-strength energy-absorbing supporting system under different working conditions can be achieved, and accurate guidance is provided for supporting design of a high-strength energy-absorbing surrounding rock control system.

The utility model discloses a fixing device for a control surface static test, which comprises a bottom plate and two clamping plates symmetrically arranged on the bottom plate, the clamping plates comprise a first clamping plate and a second clamping plate, and the distance between the first clamping plate and the second clamping plate is equal to the thickness of a control surface mounting position. Limiting holes are further formed in the first clamping plate and the second clamping plate, and the positions of the limiting holes correspond to mounting holes in the mounting position of the control plane. For the static test of the control surface, the connection between the control surface and the cabin body is canceled, the control surface is directly mounted on the wall rail or the ground rail through the fixing device, and the designed fixing device is matched with the mounting position of the control surface, so that a large amount of time can be saved, the loading is more convenient, and the test result is more accurate. By adopting the device, the control surface is directly fixed with the ground, and the deformation strain and deflection of the control surface can be more accurately obtained.