990 results about "Structural stability" patented technology

The invention provides a fan system multi-physics field coupling simulation and modeling method and device, and the method comprises the steps: building a coupling simulation frame of an electromagnetic field, a temperature field, a flow field and a structural mechanical field through multi-physics field collaborative modeling, employing a finite volume method FVM and multi-body dynamics MBS for collaborative solving, and precisely simulating the dynamic response of a fan under a complex working condition. And real-time simulation and verification: combining an S CADA system and a machine learning algorithm to realize online calibration and dynamic verification of a multi-physics field model, and supporting fan structure stability prediction under extreme conditions of typhoon, turbulence and the like. A multi-physics field coupling simulation software environment is developed, the functions of wake effect analysis, fan array layout optimization and the like are provided, the construction cost of an offshore wind field is reduced, and the power generation efficiency is improved.

The present invention belongs to the technical field of engineering monitoring, and relates to a method for monitoring construction of water conservancy projects, including: collecting monitoring data from a water conservancy project construction site; inputting the monitoring data into a structural stability prediction model for analysis to generate a safety factor assessment value; inputting the monitoring data into a seepage risk prediction model for analysis to generate a seepage risk probability; combining the safety factor assessment value and the seepage risk probability, presetting a threshold, and triggering a graded warning signal; in response to the graded warning signal, calling a multi-objective optimization algorithm to dynamically adjust the current construction parameters and generate an optimized construction plan; loading the optimized construction plan into a digital twin system for virtual construction simulation to obtain predicted performance parameters; comparing the deviation value of the predicted performance parameters with the measured monitoring data, and iteratively updating the parameters of the prediction model when the deviation exceeds the tolerance range. The present invention solves the problem that traditional methods are difficult to discover potential problems and make optimization adjustments before construction.

The invention provides a cultural relic auxiliary restoration decision-making method and system based on computer three-dimensional modeling, and relates to the technical field of computers.The method comprises the steps that firstly, three-dimensional model data including geometric shape and texture distribution information of a cultural relic to be restored are obtained, then damaged area feature extraction is conducted on the three-dimensional model data, and a damaged area feature set is obtained; the method comprises the following steps: acquiring a damaged region feature set, covering boundary contour, depth distribution and surface texture missing features, generating a repair candidate scheme set based on the damaged region feature set, including repair path planning and repair material matching information, performing repair effect evaluation on the candidate scheme set, and obtaining a scheme evaluation result containing structural stability and appearance consistency indexes. And outputting a cultural relic auxiliary repair decision report according to the scheme evaluation result, including recommended repair scheme priority ranking and implementation step description, thereby improving scientificity and accuracy of cultural relic repair decision.

The invention relates to the technical field of electronic packaging, in particular to a welding process applied to a double-mesa device. The technology comprises the following steps that firstly, a heat conduction model of a double-table-board device is built, a temperature field prediction system is built in combination with measured data, secondly, an asymmetric double-pulse-current welding strategy is adopted, differential pulse waveforms are loaded to an upper table board and a lower table board respectively, independent temperature control over all welding areas is achieved, a temperature difference closed-loop feedback mechanism is introduced in the process, and the temperature field prediction system is obtained. Pulse parameters are dynamically adjusted according to real-time temperature deviation, a stress prediction and weld penetration monitoring module is used for assistance, the welding spot forming quality and heat stress balanced release are ensured, a staged annealing type cooling mode is adopted after welding, and the structural stability is improved. The method can be widely applied to MEMS modules, SiC power devices and heterogeneous chip laminated packaging double-mesa structure devices, and has the advantages of being high in welding precision, high in reliability and wide in process adaptability.

The invention provides a cement-based marine floating structure stability control method based on a dynamic water tank adjustment algorithm, which is applied to a dynamic water tank adjustment system of a cement-based marine floating structure, and the system comprises a water tank module, a sensing network, an execution mechanism and a central control unit, the method comprises the following steps: monitoring the change of the water level in the water tank module and the shaking angle data of the cement-based offshore floating structure through a sensing network; the central control unit analyzes the data acquired by the sensing network in real time, predicts the wave load change trend in a period of time in the future, simulates the stress state of the structure, and generates a target water level value of the water tank module in combination with the characteristics of the structure material; according to the target water level value and the real-time water level value, the execution mechanism is controlled to adjust the water level of the water tank module so as to achieve stability control over the cement-based offshore floating structure, water tank adjustment and material characteristics are accurately matched, control failure or structural damage can be avoided, and then the structural stability is improved.

The invention discloses an injection molding temperature control method for rapid injection molding of an injection molded part, and relates to the field of injection molding temperature control, and the injection molding temperature control method comprises the following steps: performing main body division on a mold by scanning three-dimensional space data of the mold and combining geometric characteristics, and performing structural stability evaluation and gradient calibration on a main body division result; analyzing the surface curvature of a main body division area based on a main body division result, and setting a cooling channel local loop in combination with the heat distribution condition of an actual thermoplastic process; performing loop integration on the cooling channels of all the main body division areas, and setting the flow velocity of cooling liquid in the cooling channels based on the stress change of the injection molding part; based on the finally determined communication distribution of the cooling channels and the flow speed of the cooling liquid, the mold and the cooling channels are produced through 3D printing; according to the method, the injection molding period is remarkably shortened, the production efficiency and the quality and stability of injection molded parts are improved, and the method is suitable for rapid molding requirements of high-precision complex injection molded parts.

The invention relates to a slope structure stability safety monitoring method, which comprises the following steps of: acquiring characteristic data of geological conditions, stress states and potential instability modes of a slope, partitioning the slope according to the characteristic data, and acquiring a plurality of monitoring partitions; according to the weathering degree and structural surface development characteristics of the slope material in the monitoring subarea, obtaining a dominant deformation mode and key influence factors of the monitoring subarea; based on the dominant deformation mode and the key influence factors, obtaining a sensor optimization layout scheme in the monitoring subarea, and obtaining monitoring data of the monitoring subarea; and performing spatialization processing on the monitoring data, obtaining a spatial distribution diagram of the monitoring data, analyzing the spatial distribution diagram, identifying an abnormal region, evaluating the stability of the abnormal region, and obtaining the stable state of the slope. According to the invention, through zone monitoring and machine learning, the accuracy and pertinence of slope stability evaluation are improved, and a scientific basis is provided for making prevention and control measures and emergency plans.

The invention discloses an equipment health state dynamic prediction method fusing digital twinning and multi-scale evaluation, and relates to the technical field of equipment health prediction of an active launching platform, and the method comprises the steps: laying multiple types of sensors on a mechanical structure layer, a hydraulic execution layer, an electric control layer and an environmental action layer of the active launching platform; multi-source operation data such as stress strain, pressure torque, temperature power and environment load are collected in real time, and a standardized input parameter set is formed; and constructing a multi-layer digital twinborn model, forming a multi-scale twinborn mapping matrix, calculating a healthy coupling evolution coefficient, and evaluating the stability of the multi-layer collaborative structure of the platform. Calculating a multi-scale stability coefficient, and updating the multi-scale twin mapping matrix; and calculating a dynamic prediction driving index to realize prediction reliability judgment and digital twin model self-learning updating. And a health prediction closed loop of digital twinning and physical equipment is realized.

According to the intelligent radiator welding method and system based on welding residual stress control, temperature field data of a welding area are obtained through a sensor array, a temperature gradient mapping image is generated, residual stress distribution is determined through heat-structure coupling finite element analysis, and a thermal expansion coefficient and a welding speed parameter are extracted; when the deviation exceeds a deviation threshold value, the heat input power and the welding speed are adjusted, parameter combination is optimized, heat input distribution is redistributed, new temperature field distribution is generated by adopting a power segmentation adjustment algorithm, residual stress relief data are extracted, and if the stress reduction rate is insufficient, the welding speed is adjusted; if yes, cooling parameters are adjusted for thermal stress release, through finite element iteration fed back in real time, a process correction scheme is generated, full-process simulation verification is conducted, and the fatigue life and the thermal conductivity index are obtained. Accurate control over the residual stress in the welding process is achieved, and the intelligent welding quality and the structural stability are improved.

The invention relates to the technical field of foundation pit supporting, in particular to a point-shaped foundation pit supporting structure stability evaluation method and system, and the method comprises the steps: obtaining the engineering parameters, geological data and dynamic monitoring data of a target foundation pit; performing feature extraction on the dynamic monitoring data to obtain a stability evaluation index vector; calculating spatial effect characteristic parameters of the target foundation pit based on the engineering parameters; the influence of geological data on the spatial effect is considered, the spatial effect characteristic parameters are corrected, mapping is carried out in a preset spatial effect weight database, and an evaluation index weight vector of the target foundation pit is obtained; performing weighted calculation on the stability evaluation index vector and the evaluation index weight vector to obtain a stability evaluation index of the target foundation pit, and comparing the stability evaluation index with a preset stability threshold to obtain a stability evaluation result; according to the method, the change of the space effect of the foundation pit under different geological conditions can be reflected more accurately, so that the final stability evaluation index can reflect the actual stability of the foundation pit more accurately.

The invention discloses a building block assembly specification generation method based on dynamic stress and related equipment. According to the method, data is extracted based on images of building block components, dynamic stress characteristics are calculated and coded in a partitioned mode, a stress transmission relation is determined, key nodes are identified, an assembly step sequence is decomposed according to the key nodes, and finally an assembly specification considering dynamic stress is generated. According to the method, geometric and connection information of building block components is extracted, and dynamic stress characteristics and a transmission relation of the building block components are further calculated and analyzed, so that key stress nodes which are crucial to structural stability are identified. On the basis of the key nodes, the splicing process is decomposed into a step sequence considering stress balance, so that a splicing instruction containing stress analysis is generated, the stability of components in the building block splicing process is improved, professional splicing guidance containing dynamic stress information is provided for a user, and the building block splicing efficiency and success rate are effectively improved.

The invention discloses a soft rock geological cavern tunneling construction method, belongs to the technical field of underground engineering tunnel construction, and aims to solve the safety risk problem caused by high surrounding rock deformation rate, insufficient supporting structure stability and dynamic adjustment lag in the tunnel construction process under the soft rock geological condition. According to the method, an upper pilot tunnel area, a middle pilot tunnel area and a lower pilot tunnel area are divided in the axial direction of a tunnel and excavated step by step, multiple layers of steel arches are sequentially installed, prestressed anchor rods are constructed, a real-time stress monitoring and early warning system is combined, the supporting force of adjustable hydraulic supporting rods is dynamically adjusted, and the deformation rate and the stress level of surrounding rock are controlled. According to the technical scheme, the method is characterized by comprising partition and layering excavation, steel arch and anchor rod collaborative supporting, stress monitoring point arrangement and a dynamic compensation mechanism. The method is mainly used for safe and efficient tunneling of the soft rock geological tunnel, the surrounding rock stability and the construction safety are remarkably improved through refined construction control and real-time feedback adjustment, and the method is suitable for tunnel engineering construction under the complex geological condition.

The invention relates to a hydraulic tunnel model test device, and belongs to the technical field of pressure test devices in hydroelectric and hydraulic engineering. Multi-directional ground stress is applied through external oil cylinders, wherein the external oil cylinder on the upper portion applies vertical stress to a rock mass similar material layer; horizontal stress is applied through external oil cylinders on the left side and the right side; a clay layer is laid at the bottom, plastic deformation is generated under the action of vertical stress to form bottom ground stress from bottom to top, and full stress field simulation is achieved. The loading process is divided into two stages: firstly, ground stress loading is carried out, vertical stress and horizontal stress are sequentially applied, and a clay layer deforms to ensure bottom stress; and then internal and external water pressure loading is carried out, the external pressure controller simulates surrounding rock water pressure through the external loading membrane bag, and the internal pressure controller simulates water pressure in the tunnel through the internal loading membrane bag. According to the device, the complex stress environment of the deep-buried tunnel is truly simulated by accurately controlling the multidirectional ground stress and the internal and external water pressure, and a reliable test platform is provided for studying the stability of a lining structure.

The invention discloses an efficient preparation and construction optimization system and method for a cold patch asphalt mixture, and belongs to the technical field of construction optimization. Environmental parameters of a construction site are collected, including altitude, an air pressure correction coefficient and a light volatile factor, and a multi-scale mixture model coupled with air pressure response is constructed; analyzing the volatilization path, the structural stability and the initial bonding strength of the mixture in combination with discrete elements and fluid mechanics simulation, and further extracting a structural retention threshold value and reversely deducing the proportion adjustment amount of medium-high boiling point solvent components; meanwhile, a microcapsule controlled release technology is adopted to delay release of light components, adaptive construction parameters are output based on a simulation platform and a machine learning model, the paving temperature and the compaction frequency are dynamically optimized, and efficient cooperation and intelligent regulation and control of the cold patch material performance and the site construction technology are achieved.

The invention discloses a modularized quick mounting system for a storage tank, belongs to the technical field of storage tank construction, and solves the problems of low mounting efficiency, insufficient precision and non-uniform connection stress distribution of the storage tank in the prior art. The system comprises a storage tank wall module group, the storage tank wall module group is formed by splicing a plurality of standard arc-shaped modules through stepped plug-in structures at the two ends in the circumferential direction, and connecting plates with conical positioning holes are arranged at the bottoms of the modules; the self-adaptive positioning base is matched with the positioning module through the conical positioning column and the positioning hole; the dynamic compensation adjusting assembly comprises a plurality of sets of electric servo pushing units, and the three-dimensional posture of the module is dynamically adjusted through a module clamping arm with a roller array. During installation, a four-stage fastening process is adopted, and attitude compensation is triggered if the numerical value difference of the pressure sensor exceeds 5% in the process. The system can realize quick and accurate installation of the storage tank module, improves the structural stability and the construction efficiency, and is suitable for large storage tank construction in the fields of petrochemical engineering and the like.

The invention relates to the technical field of petrochemical equipment tank health state evaluation, in particular to a petrochemical equipment tank health state evaluation method based on multi-dimensional data. The method comprises the following steps: acquiring original data of the petrochemical equipment tank, including information such as structure, material, use environment and the like of the equipment tank, and performing acquisition of the petrochemical equipment tank structure and construction of a simulation model based on the data to obtain simulation model data of the petrochemical equipment tank; identifying an abnormal area of the equipment tank through the simulation model, carrying out overlay analysis, evaluating the structural stability and fracture probability of the equipment tank, calculating the fracture probability of the equipment tank according to abnormal overlay data and structural stability attenuation data of the equipment tank, and carrying out health state abnormity evaluation on the equipment tank based on fracture probability data; according to the evaluation result, the petrochemical equipment tank is repaired; according to the method, the petrochemical equipment tank health state evaluation is optimized, so that the petrochemical equipment tank health state identification is more accurate.

The invention belongs to the technical field of gear precision machining, and particularly relates to a high-precision machining method for a complex curved surface gear, which comprises the following steps: acquiring a gear three-dimensional model and planning an initial machining path; tooth profile errors are predicted based on the path, and real-time dynamic compensation is conducted in the machining process; predicting a heat treatment deformation trend based on the compensated motion trail and the real-time data; adjusting heat treatment process parameters according to the predicted deformation trend; and detecting the final state of the gear after heat treatment, and updating the error prediction and compensation model according to a detection result. According to the method, real-time error compensation in the machining process is associated with predictive control of heat treatment deformation to form a closed loop, the problem that in the prior art, machining precision and structural stability after heat treatment are difficult to cooperatively guarantee is solved, and high-precision and high-reliability unified manufacturing of the complex curved surface gear is achieved.

The invention relates to the technical field of storage and transportation equipment, in particular to a thin film enclosure structure and a liquid cargo tank enclosure system. The heat insulation piece layer is arranged on the side, back on to the wave protrusions, of the sealing film layer. And the reinforcing piece is arranged between the sealing film layer and the heat insulation piece layer, is connected to the heat insulation piece layer and extends into the wavy bulges formed by the sealing film layer. The wave protrusion structures can conduct self-contraction deformation to release stress when bearing deformation stress so as to maintain the stability of the whole structure, the reinforcing pieces can prevent the wave protrusions from generating large deformation, displacement and twisting deformation of the wave protrusions are prevented, and the service life of the whole structure is prolonged. And the supporting effect can still be effectively achieved under the condition that asymmetric stress exists in the liquid cargo tank containment system, the influence of various stress sources on the sealing thin film layer is relieved, the overall structural stability of the thin film type containment system is improved, and it is guaranteed that the good sealing effect and safety can be maintained under various operation conditions and external influences.

The invention discloses a concrete durability coupling experiment device suitable for marine environment conditions. The concrete durability coupling experiment device comprises a test box body assembly, a water return box body, an execution mechanism and a control system, the experiment box body assembly is of a split-mounted sealing structure, and liquid for simulating seawater and a concrete test piece to be subjected to a durability test are placed in the experiment box body assembly; the water return box body is connected with the interior of the test box body assembly through a pipeline, and simulation of the marine environment is achieved through an execution mechanism and a control system. Compared with the prior art, the whole experimental device is linked by adopting the control system and the execution mechanism, so that a closed-loop control system in which all parts work cooperatively is formed, and more accurate multi-element environment coupled marine environment simulation can be generated in the test box body; a reliable indoor coupling environment test means is provided for verifying ocean corrosion behaviors, structural stability, durability and the like of ocean engineering structures, coastal buildings, infrastructures and the like.

The invention provides a railroad sleeper crack detection method and system based on three-dimensional feature construction, and the method comprises the steps: obtaining sleeper data: obtaining a sleeper image and a thermal image; a crack sleeper screening step: screening the images of the sleepers with cracks, and calling the thermal images of the sleepers; a three-dimensional feature construction step: extracting a plane crack area, calculating the crack depth according to the thermal image through an inversion strategy, and adding the crack depth to the depth of the plane crack area to form a three-dimensional crack; a crack safety evaluation step: calibrating a main crack and a branch crack diffused with the main crack in the three-dimensional crack, analyzing a crack safety coefficient according to the size data of the main crack and the size data of the branch crack through an evaluation strategy, and judging whether the sleeper needs to be replaced or not according to the crack safety coefficient; the method has the advantages that a quantitative safety coefficient evaluation model is established through three-dimensional size analysis of the main crack and the branch cracks, and the structural stability of the sleeper can be accurately judged.

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 relates to the technical field of construction engineering quality safety management, and discloses a quality safety control and engineering cost correlation analysis early warning method based on big data. The method comprises the following steps: acquiring concrete strength and reinforcement protective layer thickness data through a sensor, and generating an original data set by combining manual measurement and verification; identifying a factor group associated with the structural stability and the corrosion risk through standardization processing and clustering analysis; predicting potential rework cost by using a neural network model, and calculating a risk influence score; dynamically adjusting a quality safety factor weight according to a construction stage, and optimizing a comprehensive index in combination with a project type; and generating a real-time cost risk early warning signal and determining an early warning level by extracting trend change of the optimization index and adopting threshold comparison. According to the method, the multi-source data is fused, the weight is dynamically adjusted, quantitative linkage and dynamic early warning of the construction quality and the construction cost risk are achieved, the accuracy and the real-time performance of construction quality monitoring are improved, and the construction cost risk is effectively reduced.

The invention relates to the technical field of engineering monitoring, in particular to a large-tonnage pre-stressed anchor cable tensioning quality intelligent evaluation system which comprises a time sequence construction module, a track recognition module, a stability recognition module, a coordination analysis module and a quality evaluation module. According to the method, the trend direction and rate conjoint analysis is carried out on multiple types of response parameters in the anchor cable tensioning process, the response synchronism characteristics in the tensioning period and in the cross-period can be accurately recognized, the anchor cable response track with a time sequence structure is constructed on the basis, accurate recognition of the lag phenomenon and the trend closing relation is achieved, and the accuracy of the anchor cable tensioning process is improved. The method further extracts the dynamic correlation characteristics between the structural disturbance and the tensioning segments, enhances the substantive identification capability of the structural stability risk by means of the time domain coincidence analysis of the disturbance duration of the unstable segments and the falling time consumption, and improves the accuracy of the structural stability risk by normalizing the response rates of the segments with the time overlapping relationship. An index system reflecting the overall coordination level can be established in an anchor cable group.

The invention belongs to the technical field of converter transformers, and particularly discloses a converter transformer vibration noise control method and system, a terminal and a medium, and the method comprises the steps: constructing a converter transformer structure geometric model, setting material attributes, and carrying out the grid division; based on the geometric model, establishing an electromagnetic field simulation model, applying excitation conditions, obtaining electromagnetic field distribution, establishing an iron core magnetostriction mathematical model, calculating vibration acceleration caused by magnetostriction and transient electromagnetic force of an iron core and a winding, and solving and extracting a displacement field and stress-strain response; establishing an acoustic coupling model on the basis of a structure vibration result, and calculating sound pressure level distribution under different frequencies by setting a structure-air coupling boundary and a matching layer; according to an acoustic simulation result, an iron core positioning structure and an oil tank reinforcing rib arrangement mode are optimized, vibration noise prediction and control of the converter transformer in a multi-harmonic excitation environment are realized, and equipment structure stability, operation reliability and environment adaptability are improved.

The invention relates to the technical field of powder metallurgy materials, and discloses a binding-phase-free hard alloy and a preparation method thereof.The binding-phase-free hard alloy comprises, by mass, 75-80 parts of WC; 8 to 12 parts of TiC; 5 to 8 parts of TaC; 3 to 5 parts of ZrC; 1.5 to 2.5 parts of HfC; 0.8 to 1.2 parts of rare earth oxide; the preparation method comprises the five key steps of core-shell structure composite powder preparation, high-energy beam melting gradient accumulation, microwave-magnetic field composite field activation, multi-stage pressure plasma sintering and staged variable-rate gradient cooling. And component gradient design is cooperated with a multi-field coupling process. Through collaborative design of a core-shell structure hard phase and a gradient composite phase, and in combination with a multi-field coupling activated sintering and gradient cooling process, the problem of obdurability balance of the non-binding-phase hard alloy is solved, the microstructure stability is optimized, and the comprehensive performance and the process controllability are improved.

The invention discloses a glassware quality detection method and system for glassware equipment, and relates to the technical field of intelligent detection.The method comprises the steps that original images and acoustic signal data of glassware are collected and preprocessed, feature data of the glassware are extracted based on the preprocessed data, and the feature data of the glassware are obtained; judging whether the glassware has defects or not according to the characteristic data, determining defect positions and types of the glassware with the defects, calculating stress distribution and thickness uniformity indexes of the glassware, and evaluating the structural stability of the glassware. And generating a quality detection report based on the defect position, the defect type and the structure stability result of the glass product, calculating the yield of the production equipment based on the quality detection report, and performing parameter adjustment and maintenance on the production equipment. By accurately calibrating the specific position of the defect, accurate coordinate data can be provided for subsequent quality analysis, misjudgment or missed judgment is avoided, and the reliability of a detection result is ensured.

The present invention specifically relates to a plate extrusion device and a method for using the same, comprising a plate discharging composite head, a plurality of feed ends arranged on one side of the plate discharging composite head, and a plurality of thermoplastic extruders correspondingly connected to the feed ends of the plate discharging composite head. The plate discharging composite head and four thermoplastic extruders matched therewith work in coordination to ensure that materials from different thermoplastic extruders can be layered and pressurized and conveyed through four conical pressurized ports, thereby achieving synchronous and precise compounding of multiple layers of materials in a plate discharging slot, ensuring close bonding between layers, and improving the structural stability of the composite plate. The horizontal plate cavity and the plate discharging slot are horizontally connected to ensure a smooth transition of the composite material during the extrusion molding process, avoiding the common extrusion instability or fault problems in traditional equipment. Combined with the use of a cooler, the composite plate can be quickly cooled and molded after extrusion, which not only improves production efficiency, but also ensures the accuracy of the plate size and surface quality.

The invention discloses a multistage self-locking type ball catching circulating short section for half-way well cementation and a control method, and relates to the technical field of oil well cementation operation, the multistage self-locking type ball catching circulating short section comprises a short section assembly, the short section assembly comprises an outer shell, a discharge port is formed in the top of the outer shell, a displacement assembly is arranged in the outer shell, and the short section assembly comprises a sliding sleeve connected into the outer shell in a sliding mode; a containing groove is formed in the outer ring of the sliding sleeve, a first ball is slidably connected into the containing groove, an upper connector is fixed to one end of the outer shell, and a lower connector is fixed to the other end of the outer shell. The non-return structure has the beneficial effects that through the arrangement of the short section assembly and the limiting assembly, after the second ball body is put in, the displacement assembly can be driven to slide and displace in cooperation with continuously-fed media and pumping pressure, non-return locking operation is completed, the second ball body is prevented from being disengaged at will, the bypass requirement is well met, and compared with a traditional spring and rubber part non-return structure, the non-return structure is simple in structure and convenient to use. The stability is better, and the well cementation operation is well carried out.

The invention provides a wind tunnel airflow and structure response coupling analysis method, and belongs to the technical field of wind tunnel construction, and the method comprises the steps: installing a multi-sensor array at a wind tunnel test section to obtain a structure response time sequence set, starting a GPU double-layer calculation unit to carry out the fluid mechanics calculation, and obtaining an airflow mass vector matrix; a time domain superposition algorithm is utilized to construct an airflow superposition feature matrix to extract multi-frequency domain response features, an airflow skewness stability matrix is calculated to quantify the asymmetry influence of an airflow field, a structural response stability feature matrix is established to represent structural stability features, and the four feature matrixes are input into a wind tunnel coupling prediction model for training and prediction. The hierarchical fusion weight parameters are dynamically adjusted through the adaptive adjustment function to adapt to different working conditions, a high-precision airflow quality prediction result is finally output, and the technical problems that in a wind tunnel test in the prior art, airflow and structure response coupling analysis precision is low, and calculation efficiency is insufficient are solved.

The invention discloses a cable-stayed bridge cable force testing method and device, a storage medium and a product, and relates to the technical field of cable-stayed bridge cable force testing. A cable-stayed bridge comprises a stay cable connected with a shock absorber; the cable-stayed bridge cable force test method comprises the following steps: carrying out a tension test on a stay cable to obtain a flexural rigidity value of the stay cable and a strain increment value caused by vibration of the stay cable near an initial balance position, and vibrating the stay cable to obtain a tension test value group of the stay cable; obtaining a simulated tension value group of the stay cable according to a preset condition; and obtaining the cable force value of the stay cable according to the simulated tension value group. According to the cable-stayed bridge cable force testing method, the problem of cable force testing errors caused by the fact that the shock absorber changes the boundary condition is effectively solved, the accuracy of cable-stayed bridge structure safety evaluation is improved, the stress condition of the stay cable under the real boundary condition can be reflected, and the structural stability of the cable-stayed bridge can be better monitored and maintained.