955 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 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 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 an automatic aligning and hinging device and method for a whole-section steel truss girder. The device comprises a main cable transverse opposite-pulling system, a monitoring system, a hoisting system, a local aligning auxiliary tool, an adjusting control system, a temporary hinging device and a fine adjusting device. The monitoring system collects data such as spatial positions and attitude angles of the steel truss girder sections in real time and feeds back information to the adjusting control system; the adjusting control system generates a control instruction based on the information, coordinates the hoisting system to adjust the overall posture and position of the steel truss girder, controls the temporary hinge device to realize flexible connection of the upper chord, and controls the fine adjustment device at the lower chord interface to automatically adjust the longitudinal position and the vertical elevation to ensure accurate closure; the local alignment auxiliary tool is used for solving the problem of difficulty in butt joint of individual rod pieces; the main cable transverse opposite-pulling system dynamically adjusts transverse deviation of the main cable, the stable structure in the hoisting process is guaranteed, all the systems work cooperatively, and efficient, safe and full-automatic alignment and hinging of the whole section of steel truss girder are achieved.

The invention relates to the technical field of aircrafts, in particular to a master-slave multi-rotor unmanned aerial vehicle which comprises a control system and a storage battery. The device further comprises a structure assembly. The structural assembly comprises a tetrahedral shell, coaxial reverse dual motors, two main rotors, three branch pipes, three driving mechanisms and three slave rotors. The control system controls operation of the whole, and the storage battery supplies power to the whole. The large-size main rotor is used for replacing a traditional multi-rotor to provide main lifting force, the efficiency can be improved, the energy utilization level can be improved, and meanwhile the loading capacity is higher compared with the multi-rotor; a combined triangle is used as a main structural form, so that the structural stability and reliability under various stress conditions are ensured, and the use is more stable under a complex scene; the flight direction, attitude and stability are controlled by three small-size slave rotors; therefore, the problems that an existing multi-rotor unmanned aerial vehicle is low in energy utilization efficiency and poor in loading capacity are solved.

The invention relates to the technical field of bridge construction engineering, and discloses a prefabricated bridge plate integral tensioning structure which comprises a bridge plate structure and a hydraulic driving device, the bridge plate structure comprises a bridge plate body, a plurality of through holes are formed in the bridge plate body, and the bridge plate body is provided with a plurality of corrugated pipes through the through holes; according to the bridge plate, through the arrangement of a double-liquid space control and limiting baffle structure of the hydraulic driving device, in the springback process after tensioning is completed, the displacement sensor monitors displacement of the steel strands in real time, and when it is detected that the springback distance is abnormal, the steel strands are driven by the hydraulic driving device to move back and forth. The position of the first anchor clamping piece is cooperatively adjusted through the third push rod and the second push rod, it is ensured that the first anchor clamping piece is tightly attached to an anchorage device hole, damage to the interior of a bridge plate due to too high prestress is avoided, potential safety hazards in subsequent use are reduced, and the structural stability is improved.

The invention discloses a flexible riser vibration response characteristic analysis method, and relates to the technical field of ocean engineering. According to the method, a flexible riser vibration model is established based on a vibration theoretical model and a fluid control equation for vibration analysis, a theoretical time domain response curve of the flexible riser is obtained through MATLAB calculation, and then a flexible riser three-dimensional simulation model is established in an ANSYS Workbench integrated simulation platform. According to the method, a flexible riser three-dimensional simulation model is constructed, material constitutive parameters, boundary conditions and load application of the flexible riser three-dimensional simulation model are configured, then simulation is performed in an ANSYS Workbench integrated simulation platform by using the flexible riser three-dimensional simulation model, bidirectional fluid-solid coupling analysis is performed by coupling a Fluent flow field system and a Transient Stratum module, the radial displacement time history of the flexible riser under a preset working condition is obtained, and the radial displacement time history of the flexible riser under the preset working condition is calculated. And extracting resonance characteristics of the flexible riser. According to the method, the vibration response characteristics of the deep-sea flexible riser under the influence of internal and external fluids in the service process are accurately obtained, and a foundation is laid for guiding the structural stability of a deep-sea operation system.

The invention discloses a building structure design method based on multi-objective optimization, and relates to the technical field of building structure design, a data input module is utilized to input parameters which need to reach an objective at the beginning of building structure design and actual structure parameters, and a comparison and evaluation module is utilized to evaluate a building structure. And sequentially calculating and outputting the structural strength JQ, the structural stability index JW and the cost-benefit index JC of the building structure, adjusting the strength, the stability and the cost of the design of the building structure according to the compared and evaluated structure, and controlling the iteration of the whole design process by utilizing an iteration control module until the design meets all the targets required to be achieved at the beginning of the design. According to the method, the effects of comprehensively evaluating the structural strength, guiding material selection, improving the design efficiency, ensuring the structural safety, optimizing the structural design and reducing the maintenance cost are achieved, the beneficial effects jointly form a solid foundation of building structural design, and powerful support is provided for high-quality development of the building industry.