15 results about "Equivalent static load" patented technology

The invention relates to the technical field of bridge bearing capacity evaluation, and discloses an existing continuous beam bridge bearing capacity comprehensive evaluation method which comprises the steps that multi-source data are collected to construct a three-dimensional damage voxel field, and an initial finite element model is generated; simulating a heavy load identification control section, and designing an equivalent static load test scheme according to an equivalent internal force principle; executing a field static load test, collecting elastic response data and constructing an actual measurement response vector; calculating errors and iteratively adjusting parameters in a voxel field constraint range to finish model correction; and generating an operation space-time security envelope based on the correction model, and comparing the state in real time to output a control instruction. A three-dimensional damage voxel field is constructed, voxels are used as a normalized data carrier, discrete apparent and internal damage data such as three-dimensional laser scanning point cloud, ultrasonic velocity and rebound strength are mapped into a continuously distributed space field, and the space variability of the rigidity of an existing bridge material can be represented in a refined mode. And the accuracy of describing the physical current situation of the structure by the initial finite element model is improved.

The invention provides a jacket type offshore electrical platform optimization method based on a sequential quadratic programming algorithm. The jacket type offshore electrical platform optimization method comprises the following steps: S1, establishing a parameterized offshore electrical platform structure analysis model; s2, calculating an environmental load borne by the offshore electrical platform by adopting an equivalent static load method; s3, establishing an offshore electrical platform optimization model which comprises a target function and a constraint function; s4, performing optimization design by adopting a sequential quadratic specification algorithm; and S5, performing dynamic analysis on the optimal structure, judging whether the optimal structure meets a constraint condition or not under a dynamic load working condition, if so, ending optimization, and if not, manually adjusting the size of the component which does not meet the constraint until the constraint condition is met. According to the method, the sequential quadratic programming algorithm is adopted, the optimization efficiency is high, the engineering optimization requirement is met, the size optimization of the offshore structure considering the pile-soil interaction under wind, wave and flow loading can be achieved, and the cost is further reduced on the premise that the structural stability and safety are guaranteed.

The application relates to a structure lightweight design method based on a modified equivalent static load method, which comprises the following steps: step 1, establishing a finite element model of an initial structure to be optimized, and calculating linear equivalent static loads; step 2, calculating modulus proportionality coefficients of a plastic deformation stage of the structure to be optimized; step 3, modifying the equivalent static loads of the structure according to the calculated modulus proportionality coefficients; and step 4, carrying out nonlinear topology optimization according to the modified equivalent static loads to obtain an energy-absorbing point lattice cell configuration, and realizing structure lightweight design. The application is based on a material and geometric nonlinear numerical modified equivalent static load method, the equivalent static load method is modified through modulus proportionality coefficients and strain matrix correction coefficients, nonlinear topology optimization of the structure is realized, a three-dimensional model of the point lattice cell configuration is reconstructed according to an optimization result, a geometric parameterized model of the energy-absorbing point lattice cell configuration is obtained, and the model is used for lightweight design of the point lattice structure under a compression load working condition.

The present invention provides a method for failure-safe topology optimization design under dynamic load, comprising: step 1, defining the design domain and design parameters of the structure; step 2, performing transient dynamic analysis on the structure; step 3, calculating the equivalent static load of the dynamic load; step 4: performing failure-safe topology optimization design on the model under equivalent static load; minimizing the maximum flexibility of the structure under local failure as the optimization goal; and using the moving asymptote method to iteratively optimize the design variable unit density until the inner loop failure-safe topology optimization process is completed; step 5: judging whether the outer loop convergence condition is met based on the updated design variables after the failure-safe topology optimization. The present invention fully considers the possible local failure of the structure during the design process, thereby improving the performance of the structure under local failure conditions; converting the dynamic load under the original working condition into a static load through the equivalent static load method, effectively improving the computational efficiency of the optimization process.

The invention provides a dynamic load prediction and dynamic intensity checking method and system for a water surface aircraft cabin section. The method comprises the steps of obtaining feature information of a water surface aircraft cabin section structure; simplifying the cabin section of the water surface aircraft into a two-dimensional model according to the feature information; establishing a hydrodynamic load prediction analysis model of the water surface aircraft cabin based on a potential flow theory; obtaining the dynamic load of each skin in the vertical water entry process according to the water entry dynamic load prediction analysis model; calculating a dynamic load factor at each skin position; calculating an equivalent static load according to the dynamic load of each skin in the vertical water entry process and the corresponding dynamic load factor, and applying the equivalent static load to the skin at the bottom; the underwater dynamic load prediction analysis model is adopted to carry out dynamic load rapid prediction of underwater of a water surface aircraft cabin section, large-scale numerical calculation of a traditional fluid-solid coupling algorithm is avoided, and a large amount of time and hardware resources are remarkably saved; and structure dynamic strength checking based on statics is realized.

The application discloses a rigidity design method of a self-standing reinforced steel chimney, and belongs to the technical field of structural engineering. Firstly, according to the chimney size of the preliminary design and the basic wind pressure value of the design, the standard value of the along-wind load and the equivalent static load of the transverse-wind vortex-induced resonance are respectively calculated, and based on the virtual work principle of structural mechanics, a theoretical solution of the top horizontal displacement of the chimney is obtained. Secondly, considering the influence of the deformation characteristics of the chimney shell and the like, the theoretical solution is multiplied by a maximum horizontal displacement correction coefficient to obtain a real value of the maximum absolute value of the horizontal displacement of the top of the chimney cylinder. Finally, whether the real value of the horizontal displacement exceeds the limit value of the specification is checked to determine whether the chimney wall thickness needs to be increased to improve the rigidity. The application is accurate and reliable, simple to calculate, can save the building materials as much as possible under the premise of ensuring the reliable rigidity of the chimney cylinder structure, and is helpful to obtain a reasonable and reliable rigidity design scheme of the self-standing reinforced steel chimney under the combined action of the along-wind load and the transverse-wind load.

The invention provides a fastener stress determination method, electronic equipment and a readable storage medium, and is suitable for the technical field of fastener stress calculation. The method comprises the following steps: acquiring related parameter information; wherein the related parameter information is a parameter related to the stress of the fastener; based on an equivalent static method and the structure and the installation type of the motor, determining a target stress calculation formula from a preset corresponding relation between the motor and a stress calculation formula; wherein the equivalent static method is used for converting an earthquake load into an equivalent static load; and determining the stress of the fastener based on the related parameter information and a target stress calculation formula. According to the embodiment of the invention, the problems of high calculation cost, long time consumption and relatively high requirement on the precision of the model are avoided, the efficiency of calculating the stress of the fastener is improved, and the accuracy of calculating the stress of the fastener is ensured.

This invention provides a multi-level collaborative topology optimization method for aluminum alloy frames based on Internet of Vehicles (IoV) big data, applied to the field of lightweighting technology for new energy vehicles. The method includes the following steps: generating a comprehensive weight by integrating subjective and objective weights; constructing a multi-task topology optimization objective function using a compromise programming method; performing a first-level overall frame topology optimization using the SIMP variable density method to determine the number and spatial layout of crossbeams; constructing a rigid-flexible coupling virtual prototype to extract the equivalent static load at the longitudinal / crossbeam connections, and performing a second-level cross-sectional topology optimization based on extrusion process constraints to obtain the optimal longitudinal / crossbeam cross-sectional configuration. Through this multi-level optimization architecture of "data-driven weight allocation, overall layout optimization, and local cross-sectional collaborative design," the frame lightweighting rate is increased by 15%-22%, while bending and torsional stiffness are increased by 12%-18% and 10%-15%, respectively, while ensuring the process feasibility of aluminum alloy extrusion.

The present application relates to steel frame assembly technical field, and disclose a kind of steel frame-combination lateral force resisting system and assembly method, a kind of steel frame-combination lateral force resisting system assembly method, comprising: step S1, foundation positioning and support installation;Step S2, main frame hoisting;Step S3, transverse beam installation and node splicing fixed;Step S4, repeat installation and expand to full-span structure;Step S5, final fastening and acceptance detection.The present application follows the logic of "first welding flaw detection, then load test, finally glue sealing", to prevent hidden works "sealing with disease";Modified epoxy resin is injected under equivalent static load stress state, fill micro gap, form prestressed occlusion after unloading, realize excellent "reinforcement under load" and fatigue resistance, last glue emptying air before acceptance, maximum limit reduce water vapor residue, achieve real air-tight long-term corrosion protection.

The present application relates to steel frame assembly technical field, and disclose a kind of steel frame-combination lateral force resisting system and assembly method, a kind of steel frame-combination lateral force resisting system assembly method, comprising: step S1, foundation positioning and support installation;Step S2, main frame hoisting;Step S3, transverse beam installation and node splicing fixed;Step S4, repeat installation and expand to full-span structure;Step S5, final fastening and acceptance detection.The present application follows the logic of "first welding flaw detection, then load test, finally glue sealing", to prevent hidden works "sealing with disease";Modified epoxy resin is injected under equivalent static load stress state, fill micro gap, form prestressed occlusion after unloading, realize excellent "reinforcement under load" and fatigue resistance, last glue emptying air before acceptance, maximum limit reduce water vapor residue, achieve real air-tight long-term corrosion protection.

The application relates to the technical field of bridge bearing capacity evaluation, and discloses a kind of comprehensive evaluation method of bearing capacity of existing continuous girder bridge, comprising the following steps: collecting multi-source data to construct three-dimensional damage voxel field, generating initial finite element model;Simulate heavy load identification control section, design equivalent static load test scheme according to equivalent internal force principle;Performing field static load test, collecting elastic response data and constructing measured response vector;Calculate error and iteratively adjust parameters within the constraint range of voxel field, complete model modification;Generate operation space-time safety envelope based on the modified model, and compare state output control instruction in real time.Through the construction of three-dimensional damage voxel field, the voxel is used as the normalized data carrier, and the discrete apparent and internal damage data such as three-dimensional laser scanning point cloud, ultrasonic velocity and rebound strength are mapped into continuous distribution space field, which can finely represent the spatial variability of the material stiffness of the existing bridge. The accuracy of the initial finite element model in describing the physical status of the structure is improved.

The embodiment of the invention provides a power electronic interface load equivalent model construction method considering harmonic characteristics. The method comprises the steps that a fault recorder is adopted to record voltage and current instantaneous values, and steady-state operation, static response and dynamic response data are separated; calculating an equivalent static load model based on the static response; identifying an equivalent dynamic load model based on the dynamic response; analyzing harmonic composition, obtaining the amplitude proportion and initial phase relation of each harmonic, and calculating a harmonic initial phase and fundamental wave initial phase function; and comprehensively establishing a power electronic interface load electromagnetic transient equivalent model. According to the technical scheme provided by the invention, the harmonic characteristics of the power load can be fully considered in the full-electromagnetic transient simulation of the power system, and the method has important significance for improving the accuracy of the full-electromagnetic transient simulation of the power system.

The application relates to the technical field of topology optimization, and discloses a thermal force coupling multi-scale parallel topology optimization method for additive manufacturing, which divides a macroscopic design domain into a plurality of macroscopic sub-design domains through a fuzzy C clustering method, maps macroscopic sub-design domain information on a microscopic side as a constraint condition for microscopic optimization, converts transient temperature load into equivalent static load, introduces the equivalent thermal load into a multi-scale topology optimization model, carries out thermal force coupling finite element analysis of the macroscopic and microscopic sides according to a thermal force coupling control equation, solves a displacement vector matrix by using an HHT-alpha method, analyzes the sensitivity of a macro-microscopic objective function and a constraint condition, and uses a moving asymptote MMA method as a solver for updating the macro-microscopic design variables; the microstructure is filled into the macroscopic configuration to obtain an overall configuration, and a convergence condition is judged; if the convergence condition is met, an optimal material distribution structure and a microscopic optimal configuration are output. The application can better reflect the real working state of a workpiece.

The invention relates to an amphibious equivalent static load loading experiment device of carrying equipment. The amphibious equivalent static load loading device comprises a force loading device, a carrying equipment fixing support, a portal frame, a lateral loading rack and a load transmission rack. The static load loading device is designed for solving the problems that high-speed amphibious carrying equipment has multi-working-condition cross-domain service requirements on water and land, multi-field load floating is large, constraint is complex, and consequently the rigidity, strength and lightweight design of a vehicle body structure is difficult, the static load loading device is used for simulating complex working conditions in an amphibious environment, and the real working conditions are equivalently loaded in an experiment. The loading device adopts a modular design, has height adjustability, can adapt to different test requirements, and provides a flexible test scheme. The device is used for detecting whether performance indexes such as rigidity and strength of equipment under typical working conditions meet specified requirements or not, and the safety and reliability of the equipment under complex working conditions are improved.

The invention discloses an integrated die-casting floor structure optimization method and related equipment, relates to the field of vehicle body structure design and manufacturing, and mainly aims to solve the problem of low development efficiency of an integrated die-casting floor structure caused by dependence on experience of engineers in the prior art. The method comprises the following steps: determining an optimization target and a performance constraint condition of a floor structure; an equivalent static load model is determined based on the collision peak force and the dynamic correction coefficient, and the equivalent static load model is used for feeding back the collision process of the floor; based on the equivalent static load model, the optimization target and the performance constraint condition are automatically solved to obtain an optimal scheme, and the optimal scheme is used for feeding back die-casting structure characteristics of the floor structure. The method is used for the optimization process of the integrated die-casting floor structure.