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35 results about "Equivalent static load" patented technology
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Equivalent Static Load. The equivalent static load P 0 is a theoretical value (according to ISO 76). It is a radial load for radial bearings and an axial and centrical load for thrust bearings. P 0 causes the same stress at the center of the most heavily pressurized contact area of the rolling element or raceway as the actual load combination.
Topology optimization method using equivalent static loads
InactiveUS20100058257A1Accurate solutionReduce in quantityMulti-objective optimisationSoftware simulation/interpretation/emulationTopology optimizationEngineering
A topology optimization method. Characteristics of a structure to be designed are differentiated to calculate equivalent static loads. A relative fraction of material is adopted as a design variable. It is determined whether or not an element exists based on an objective function and constraints. Design topology is derived through a linear static analysis that processes the equivalent static loads as multiple loading conditions. Topology of the structure to be designed is compared with the design topology, and thereby the progress of optimization is determined. The topology optimization processes are terminated when a difference of the compared result is less than a setup value, and are returned to an initial step when the difference is greater than the setup value, and the equivalent static loads are calculated using the design topology as a new structure to be designed.
Owner:IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
Automobile chassis part weight reduction method based on multi-body dynamics and topological optimization technology
The invention provides an automobile chassis part weight reduction method based on multi-body dynamics and a topological optimization technology for the purpose of solving the problems that in existing automobile designs, a clear and feasible weight reduction method is unavailable, and an automobile chassis part still has a large weight reduction space. The automobile chassis part weight reduction method comprises the following steps: step 1, a finished automobile multi-body dynamic model and an object part finite element model of an object automobile type for weight reduction are established; step 2, multiple typical working conditions are selected, and an equivalent static load borne by an object part under each typical working condition is extracted; step 3, the equivalent static loads extracted in the step 2 are used as optimization boundary conditions, a flexibility weighting coefficient of each typical working condition is selected, the minimum total weighting flexibility serves as an objective function, and topological optimization is conducted with a constraint function including modality and stress; step 4, a threshold value is selected for a topological optimization result, and the position of a material to be removed is guided. The automobile chassis part weight reduction method based on the multi-body dynamics and the topological optimization technology combines a fatigue strength design with a static strength design, thereby having high reliability, portability and operability and being capable of effectively shortening the development cycle.
Owner:NINGBO HUIZHONG AUTOMOTIVE CHASSIS MFG
A realization method for integrated load model of distribution network in power system
InactiveCN101192754AReduce problem sizeSmall amount of calculationReactive power adjustment/elimination/compensationAc network voltage adjustmentTransient statePower compensation
The invention provides a method for realizing consideration of the synthesis load model of a distribution network in an electric power system, wherein an equivalent static load, an equivalent motor, an equivalent generator and a reactive power compensation device are connected with a transformer generatrix though an equivalent impedance of the distribution network, thus forming a virtual load node. According to the arithmetic feature of the synthesis load model structure and the stable simulation software in a transient state of the electric power system, the invention provides an iterative solution method which does not expand the scope of node admittance determinant and has a small increase in calculation quantity.
Owner:CHINA ELECTRIC POWER RES INST
Dynamic response topological optimization method implemented by application of improved bi-directional evolutionary structural optimization (BESO) to equivalent static load method
InactiveCN106372347AReduce optimization timeCalculation speedDesign optimisation/simulationConstraint-based CADTopology optimizationPhases of clinical research
The invention relates to a dynamic response topological optimization method implemented by application of improved bi-directional evolutionary structural optimization (BESO) to an equivalent static load method. In the method, improved BESO is applied to the equivalent static load method to form an optimized iteration method for replacing an original variable density method, and establish a new convergence condition in order to improve a dynamic response topological optimization flow. By adopting the method, optimization time of a design circulation stage of which k is greater than 1 can be reduced effectively, and CPU (Central Processing Unit) total time needed by optimization in two examples is reduced by 21.8 percent and 25.3 percent compared with an original method; the method has the characteristics of high computation speed and simple optimization flow; along with the increase of external load acting points and the expansion of the optimization scale, design circulation times needed by optimization are increased, and the method has greater advantages.
Owner:XIAMEN UNIV TAN KAH KEE COLLEGE
Power distribution network comprising direct-current distributed power supply and analysis method of comprehensive load characteristics of power distribution network
InactiveCN103595040ASimple structureComprehensive description abilityAc network circuit arrangementsLoad modelInduction motor
The invention relates to a power distribution network comprising a direct-current distributed power supply and an analysis method of comprehensive load characteristics of the power distribution network. The power distribution network comprises static loads, a dynamic load bus and comprehensive loads, wherein the static loads are equivalent static loads formed by combining static load elements and the direct-current distributed power supply, a model structure of the comprehensive loads is a generalized comprehensive load model structure and comprises a reactive compensation device, static loads, induction motor loads, an equivalent power supply, a power distribution network equivalent impedor, the reactive compensation device, the static loads, the equivalent power supply and an induction motor are connected in parallel and are connected to an external system through the power distribution network equivalent impedor. The model structure of the comprehensive loads adopted in the power distribution network can integrally describe various load characteristics of nodes, and the problem that after a large number of distributed power generation devices are connected to the power distribution network, the power distribution network affects the comprehensive load characteristics is solved.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
Nonlinear topological optimization method for car body welding spot arrangement
ActiveCN106126849AGuaranteed accuracyGuaranteed reasonablenessGeometric CADDesign optimisation/simulationManufacturing cost reductionElement model
The invention discloses a nonlinear topological optimization method for car body welding spot arrangement. The method comprises the steps that a vehicle crash simulation finite element model is established, LS-DYNA calculation is submitted, and displacement values of crash performance key attention nodes are output; a white car body linear rigidity simulation finite element model is established, and GENESIS optimizing calculation is submitted; entity units are adopted for modeling of relevant welding spots in a crash model and a white car body model; an equivalent static load method is adopted for transforming crash nonlinear conditions into linear static conditions for topological optimization design; the welding spots are set to be topological variables, obtained welding spot density values are updated into the crash finite element model, and a new round of crash simulation analysis is conducted; lastly, a convergence result is postprocessed. According to the method, the entity welding spots are subjected to topological optimization, car body welding spot arrangement is realized on the premise that crash properties at all important moments are met, reasonability of car body welding spot arrangement is ensued, redundant welding spot arrangement is avoided, the number of the welding spots is reduced, manufacturing cost is lowered, and production efficiency is improved.
Owner:迅仿科技(上海)有限公司 +2
On-site wind pressure resistance equivalent static-load detection method and device
InactiveCN102095568ASolve the technical problem that the wind pressure resistance performance cannot be detectedTroubleshoot undetectable technical issuesAerodynamic testingMaterial strength using tensile/compressive forcesFixed frameEngineering
The invention relates to an on-site wind pressure resistance equivalent static-load detection method and device. The method comprises the following steps of: (1) opening and closing an openable part on a tested curtain wall component for at least five times and finally closing; (2) fixedly arranging a fixed frame at one side of the tested curtain wall component and fixedly connecting a displacement meter matched with the tested curtain wall component on the fixed frame; (3) fixedly arranging a counter-force supporting frame at the other side of the tested curtain wall component; (4) arranging an airbag connected with a manometer and an air pump in a gap between the counter-force supporting frame and the tested curtain wall component; (5) preliminary pressing; and (6) detecting deformation. By using the detection method, the wind pressure resistance of an existing curtain wall can be rapidly and accurately detected to provide guarantee for the normal use of the curtain wall, the detection method is simple, rapid, suitable for popularization and use in a large area, and the detection device is extremely simple in structure, low in manufacture cost and convenient to operate.
Owner:CHINA ACAD OF BUILDING RES
Method for designing hybrid fiber composite anti-explosion tank
The invention discloses a method for designing a hybrid fiber composite anti-explosion tank. The hybrid fiber composite anti-explosion container tank is obtained with an anti-explosion tank mechanical property determining method and a fiber hybrid ratio determining method based on anti-impact performance. The method is characterized by including the steps that impact loads of the anti-explosion tank during an explosion are obtained through the incoming overpressure, the reflecting overpressure and the power coefficient generated during a TNT explosion with an equivalent static load method; the stress borne by fibers is calculated through a grid theory in cooperation with a direct cylinder section and an end socket section of the anti-explosion tank, and the thickness of the wound fibers is obtained; the anti-impact performance in the fiber level is evaluated by introducing fiber energy absorption, and an anti-impact performance judgment criterion in the equivalent anti-explosion structure level is obtained; and the fiber ratio generated when the anti-impact performance is highest is selected as the optimal hybrid ratio by controlling the mass and the elastic modulus of the anti-explosion tank. According to the method, due to the anti-impact performance judgment criterion and the hybrid fiber anti-explosion tank optimal hybrid ratio determining method, powerful bases are provided for designing and manufacturing of the hybrid fiber composite anti-explosion tank.
Owner:DALIAN UNIV OF TECH
Battery bin anti-collision beam topological optimization method based on equivalent static load method
PendingCN107729657AImprove optimization efficiencyDesign optimisation/simulationSpecial data processing applicationsTopology optimizationEngineering
The invention discloses a battery bin anti-collision beam topological optimization method based on an equivalent static load method. Time steps of equivalent static load extraction points are cleared,the mass of an anti-collision beam is adopted as a target function, displacement is adopted as constraint, and the optimal anti-collision beam structural mode is finally obtained through uninterrupted iterative optimization process. In other technical fields, extraction of equivalent static loads is performed in the whole dynamic process, only first six time steps before collision ending are extracted from the equivalent static loads, the optimization efficiency is improved, and by adopting topological optimization based on a variable density method, the passenger car battery bin anti-collision beam with the optimal structure can be obtained finally.
Owner:开沃新能源汽车集团股份有限公司
Air conditioner load modeling method based on least squares parameter identification
InactiveCN104701839AHarm reductionChanging the situation where there is no dedicated modeling methodLoad forecast in ac networkTransient stateLoad model
An air conditioner load modeling method based on least squares parameter identification is characterized in that air conditioner load is simulated by equivalent static load and equivalent dynamic load, a non-linear state equation is used to describe the equivalent mechanism model of the compressive load of the air conditioner load; and the steady state constraint condition of the air conditioner load is set and added into a weighing matrix for calculation; the working principle of the load modeling method based on the steady state constraint weighing least squares parameter identification, and corresponding detailed parameter identification steps which can be implemented by a computer are provided. The method has the advantages that a precise air conditioner load model can be provided, simulation results approximate to actual situations can be acquired, influence of the air conditioner load to a power grid can be identified favorably, and searching of methods for reducing air conditioner load damage is helped; the situation that no air conditioner load modeling exits is changed, the defects that the air conditioner load model cannot consider both steady state and transient state, and air conditioner load model accuracy is increased.
Owner:STATE GRID CORP OF CHINA +1
Topological parameter hybrid optimization method for nonlinear dynamic system structure of high-speed light load mechanism
ActiveCN105243231AMeet different design needsImprove performanceSpecial data processing applicationsAlgorithmTopology optimization
The invention discloses a topological parameter hybrid optimization method for a nonlinear dynamic system structure of a high-speed light load mechanism. According to the method, a linear structure optimization iteration of a standard ESLM (equivalent static loads method) is defined into a single modification, so that a change of an inertial load caused by a structure modification is immediately reflected into an optimization model; a structure with the minimal equivalent load change is obtained; and aiming at a problem that a topological structure tending to 0 or 1 cannot be obtained by the single modification, the standard ESLM is further introduced to obtain a clear topological optimization structure, so that the hybrid optimization of the high-speed light load mechanism on the basis of a single or maximum iteration ESLM is achieved. According to the topological parameter hybrid optimization method, equivalent loads are considered into a function of a design variable; the optimization model is reconstructed; a corresponding determining method is provided; the residual amplitude can be lowered to the maximal extent under the condition of meeting optimization conditions; compared with standard equivalent static loads, the amplitude under the same motion condition can be lowered by a half; the properties of the high-speed light load mechanism are greatly improved; and different design requirements of the high-speed light load mechanism are met.
Owner:GUANGDONG UNIV OF TECH
An automobile bumper mask size optimization method based on an equivalent static load method
ActiveCN109726506AImprove general performanceStrong computational efficiencySustainable transportationSpecial data processing applicationsEngineeringFinite element software
The invention belongs to the technical field of automobiles, and particularly relates to an automobile bumper mask size optimization method based on an equivalent static load method. According to themethod, the total mass of the automobile bumper mask is taken as an objective function, displacement is taken as a constraint, and the thickness of the mask is taken as a design variable to carry outsize optimization design on the bumper mask. According to the method, a final optimization result is required to meet a convergence condition and a displacement constraint condition, and the optimization result is more accurate. In addition, only the equivalent static load of the time step with the maximum displacement is calculated, the equivalent static load of all the time steps does not need to be calculated, and the calculation efficiency is high. All the functions are integrated through matlab, automatic solving is achieved, besides basic model preprocessing, finite element software doesnot need to be opened any more to solve the model, a running program directly calls a related solver to solve the model, and operation is convenient.
Owner:JILIN UNIV
Method for carrying out structural topological optimization on nonlinear dynamic systems of high-speed light-load mechanisms
ActiveCN105224770AMeet different design needsImprove performanceSpecial data processing applicationsAlgorithmNon linear dynamic
The invention discloses a method for carrying out structural topological optimization on nonlinear dynamic systems of high-speed light-load mechanisms. According to the method, the number of linear static structure optimization iterations in an ESLM (equivalent static loads method) is restricted according to the minimum number of iterations required by the structural topological optimization, so that the modifier in the optimization is restricted, the model error caused by equivalent load is reduced, and the structural topological optimization of the high-speed light-load mechanisms on the basis of structure restricted modified ESLM. According to the method, the equivalent load is considered as a function of a design variable, the optimization model is reconstructed, and a corresponding solving method is proposed, so that the residual amplitude is reduced as much as possible while the optimization condition is satisfied, compared with the standard equivalent static load, the amplitude under the same movement condition can be reduced by a half, the performance of the high-speed light-load mechanisms can be greatly improved and different design requirements of the high-speed light-load mechanisms can be satisfied.
Owner:GUANGDONG UNIV OF TECH
Method and device for detecting stability of transient voltage of electric power system
ActiveCN106599425AImprove the level of safe and stable operationHelps to identifyDesign optimisation/simulationSpecial data processing applicationsStability parameterLoad bus
The invention relates to a method and a device for detecting stability of transient voltage of an electric power system. The method comprises the following steps of reading offline load parameters of a synthetic load model, wherein the offline load parameters include rotor impedance, stator impedance and excitation reactance of an equivalent motor and impedance of an equivalent static load; reading voltage at a load bus and active power at the load bus in real time; computing rotating speed of the equivalent motor at the next moment according to the offline load parameters, the active power at the load bus and the voltage at the load bus; computing recovery time of the rotating speed of the equivalent motor according to the offline load parameters, the rotating speed of the equivalent motor at the current moment and the rotating speed of the equivalent motor at the last moment; and determining stability parameters of the transient voltage according to the recovery time of the rotating speed of the equivalent motor. The method and the device put forward quantitative evaluation indexes for analysis of the stability of the transient voltage of the electric power system and have the advantages of simplicity, rapidity, high efficiency and the like.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Method of determining impact-load equivalent static load
ActiveCN106706190AEquivalent impact loadImprove realismApparatus for force/torque/work measurementElasticity measurementFundamental frequencyPeak value
The invention belongs to the structure and equipment impact resistance design technology field and relates to a method of determining an impact-load equivalent static load. The method comprises the following steps of step1, according to the following formula which is defined in the description, calculating a dynamic scaling coefficient lambda, wherein TD is duration of an impact load, and fn is a fundamental frequency of a structure to be impacted; and step2, according to the following formula, calculating an equivalent static load Ps of the impact load, wherein the formula is Ps=lambda P, and the P is a peak value of the impact load. A lambda value acquired through calculation in the scheme can be greater than and less than 1 according to a change of TDfn, which is really equivalent to the impact load, and a truth degree of the equivalent static load is increased.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
A lightweight design method of protective structure under equivalent static load
ActiveCN109241685ATo achieve the purpose of lightweightIncrease profitGeometric CADSustainable transportationShock waveMathematical model
The invention provides a lightweight design method of a protective structure under the action of an equivalent static load. According to the actual plugging size of civil air defense engineering, thewhole structure of protective equipment is established, the dynamic load of explosion shock wave is transformed into the uniformly distributed static load on the surface of the structure by the equivalent static load method, Mathematical model is established to optimize the topology, and the whole solid structure is designed by differential structure. Finally, according to the requirements of theassembly structure and the theory of size optimization, the purpose of lightweight is achieved. Through the design method of the invention, the design variables can be changed and the optimal solutionof single objective or even multi-objective value under constraint conditions are obtained. It is an excellent method to realize the lightweight of structure in mechanical design. It greatly improvesthe utilization rate of material, lightweight design lightens the weight of equipment, improves the operation performance of equipment and the safety of civil air defense engineering assembly.
Owner:CHINA INST OF BUILDING STANDARD DESIGN & RES
High speed light-load mechanism nonlinear dynamic system structure evolution optimization method
InactiveCN105335565AMeet different design needsImprove performanceGeometric CADDesign optimisation/simulationNon linear dynamicStrain energy
The invention discloses a high speed light-load mechanism nonlinear dynamic system structure evolution optimization method. The method aims at a nonlinear kinetic analysis to directly calculate sensitivity information of element strain energy and directly obtain the element strain energy at each time point, the strain energy at all the time points is superposed after normalization processing, the comprehensive sensitivity for measuring all discrete points is obtained, structure modification is performed by adopting an evolutionary structural method, then the structure is updated, the nonlinear analysis is performed again, and the process is repeated until an optimal object is realized. According to the method disclosed by the invention, the equivalent load calculation is omitted, and the change on inertial load by structural modification is directly reflected into a model to obtain a more optimal optimization result. According to the method disclosed by the invention, the equivalent static load is considered as a function of a design variable, and a corresponding calculation method is proposed, compared with a standard equivalent static load, the amplitude in the same movement condition can be lowered by half, and the performance of the high speed light-load mechanism is greatly improved.
Owner:GUANGDONG UNIV OF TECH
Equivalent dead load acquisition method, topological optimization method and system
ActiveCN112818583AAccurately reflect the stress situationImprove optimization effectDesign optimisation/simulationSpecial data processing applicationsElement modelAlgorithm
The invention discloses an equivalent static load acquisition method and a topological optimization method and system, and the method comprises the steps: building a topological entity model according to engineering practice, and applying a moving load and a self-weight load to the entity model to obtain a topological finite element model; solving a displacement field of the topology under the action of a moving load according to the finite element model; and constructing a correlation equation between the equivalent static load and a displacement field generated by the equivalent static load, substituting the displacement field of the topology under the action of the moving load into the correlation equation based on the principle that the displacement field generated by the equivalent static load at each moment is the same as the displacement field generated by the moving load at the same moment, and solving the equivalent static load of the topology. Compared with the prior art, the method has the advantages that the dynamic effect of the moving load on the topology is fully considered, the calculated equivalent static load can accurately reflect the topology stress condition under the action of applying the moving load, and then the optimization effect of the method for topology optimization by using the equivalent static load is better.
Owner:CENT SOUTH UNIV
Improved Bidirectional Progressive Method Equivalent Static Load Method Dynamic Response Topology Optimization Method
InactiveCN106372347BReduce optimization timeCalculation speedDesign optimisation/simulationConstraint-based CADTopology optimizationComputer science
The invention relates to a dynamic response topological optimization method implemented by application of improved bi-directional evolutionary structural optimization (BESO) to an equivalent static load method. In the method, improved BESO is applied to the equivalent static load method to form an optimized iteration method for replacing an original variable density method, and establish a new convergence condition in order to improve a dynamic response topological optimization flow. By adopting the method, optimization time of a design circulation stage of which k is greater than 1 can be reduced effectively, and CPU (Central Processing Unit) total time needed by optimization in two examples is reduced by 21.8 percent and 25.3 percent compared with an original method; the method has the characteristics of high computation speed and simple optimization flow; along with the increase of external load acting points and the expansion of the optimization scale, design circulation times needed by optimization are increased, and the method has greater advantages.
Owner:XIAMEN UNIV TAN KAH KEE COLLEGE
A wind load simulation test method for mobile houses with double-slope roofs
The invention relates to a wind load simulation test method for a mobile house with a double-slope roof in the technical field of wind resistance detection of a mobile house. The wind load of the mobile house is converted into the wind load applied to the windward side by a transverse wind load simulation loading device and a wind suction simulation loading device. The equivalent static load of the multi-point loading on each main load-bearing component on the north wind side is carried out step by step multi-point loading test to measure the displacement and strain of each stressed beam column under various wind loads, and then evaluate and verify the activity room The wind resistance performance of the structure simplifies the loading method and graded loading process in the test process, and carries out graded loading and graded tests for the main load-bearing components. The safety of the test process is high, and it also solves the problem of wind resistance of large-scale movable houses. The problem of limited implementation of tests and wind tunnel tests.
Owner:中国人民解放军陆军研究院特种勤务研究所
A Method of Quantitatively Analyzing the Starting Ability of Stepping Motor
The invention discloses a method for quantitatively analyzing the starting capability of a stepping motor, comprising: (1) testing the maximum static starting torque of the stepping motor at different starting frequencies, and drawing the static torque-frequency characteristic curve of the motor; (2) The stepper motor rotor is affected by the initial speed and initial position when it is dynamically started, which is equivalent to the initial speed equivalent load torque T L1 and initial position equivalent load torque T L2 ; (3) According to the actual initial running state of the stepper motor and the actual load torque T L , and further obtain the total equivalent static load at each initial speed and initial position when dynamic starting; (4) compare the total equivalent static load with the maximum static starting torque at a specific starting frequency, and judge that the stepper motor is at Whether it can start normally at this starting frequency. With the invention, the initial speed and the initial position can be equivalent to the equivalent load torque, so that the dynamic starting performance of the stepping motor can be analyzed by using the static torque-frequency characteristic.
Owner:ZHEJIANG UNIV
A structural design method for a double-speed translation mechanism of a robot
ActiveCN104182584BFast processFulfil requirementsSpecial data processing applicationsTopology optimizationEngineering
The invention discloses a structural designing method for a robot multiple-speed translation mechanism and belongs to the field of mechanical equipment. The structural designing method includes simulating load borne by a main beam in actual working condition and analyzing to acquire dynamic load; applying the dynamic load onto the main beam, and calculating equivalent static load of the main beam; taking the equivalent static load of the main beam as a boundary condition to adopt a variable density method to perform topological optimizing design on structure of the main beam. By taking the equivalent static load of the main beam of the robot multiple-speed translation mechanism as the boundary condition, optimal material distribution of the main beam is acquired on the basis of the variable density method, and finally a multiple-speed translation mechanism with optimal comprehensive performance is acquired, so that maximum deformation can be reduced while structural weight is reduced, and working requirements on high speed and high accuracy of a robot are met.
Owner:SHANGHAI FANUC ROBOTICS
A Method of Determining the Equivalent Static Load of Shock Load
ActiveCN106706190BEquivalent impact loadImprove realismApparatus for force/torque/work measurementElasticity measurementFundamental frequencyPeak value
The invention belongs to the structure and equipment impact resistance design technology field and relates to a method of determining an impact-load equivalent static load. The method comprises the following steps of step1, according to the following formula which is defined in the description, calculating a dynamic scaling coefficient lambda, wherein TD is duration of an impact load, and fn is a fundamental frequency of a structure to be impacted; and step2, according to the following formula, calculating an equivalent static load Ps of the impact load, wherein the formula is Ps=lambda P, and the P is a peak value of the impact load. A lambda value acquired through calculation in the scheme can be greater than and less than 1 according to a change of TDfn, which is really equivalent to the impact load, and a truth degree of the equivalent static load is increased.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
A method for optimizing the size of automobile bumper mask based on the equivalent static load method
ActiveCN109726506BImprove general performanceStrong computational efficiencyGeometric CADSustainable transportationSimulationFinite element software
Owner:JILIN UNIV
Design Method of Hybrid Fiber Composite Explosion-proof Tank
Owner:DALIAN UNIV OF TECH
Thin-wall structure large-deformation collision topological optimization method based on equivalent linear static load
PendingCN114218673ATheoretical rigorSimple calculationGeometric CADDesign optimisation/simulationCollision analysisTopological optimization
The invention belongs to the technical field of structural nonlinear dynamic response topological optimization design, and particularly relates to a thin-walled structure large-deformation collision topological optimization method based on an equivalent linear static load. The method comprises a structure collision analysis module, an equivalent linear static load calculation module, a structure linear static topological optimization module and a model updating module. Wherein an equivalent linear static load calculation method provided by the equivalent static load calculation module not only can realize free scaling according to the non-linear degree of a problem, but also can ensure that the used structure is always kept in a linear range; therefore, the problem that a standard equivalent static load method cannot be suitable for large-deformation collision topological optimization of the thin-wall structure is fundamentally solved, and a feasible technical scheme is provided for the crashworthiness and lightweight design of the thin-wall structure widely involved in automobile structure optimization design.
Owner:任春
Power system transient voltage stability detection method and device
ActiveCN106599425BImprove the level of safe and stable operationHelps to identifyDesign optimisation/simulationSpecial data processing applicationsStability parameterTransient state
The invention relates to a method and a device for detecting stability of transient voltage of an electric power system. The method comprises the following steps of reading offline load parameters of a synthetic load model, wherein the offline load parameters include rotor impedance, stator impedance and excitation reactance of an equivalent motor and impedance of an equivalent static load; reading voltage at a load bus and active power at the load bus in real time; computing rotating speed of the equivalent motor at the next moment according to the offline load parameters, the active power at the load bus and the voltage at the load bus; computing recovery time of the rotating speed of the equivalent motor according to the offline load parameters, the rotating speed of the equivalent motor at the current moment and the rotating speed of the equivalent motor at the last moment; and determining stability parameters of the transient voltage according to the recovery time of the rotating speed of the equivalent motor. The method and the device put forward quantitative evaluation indexes for analysis of the stability of the transient voltage of the electric power system and have the advantages of simplicity, rapidity, high efficiency and the like.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Topology optimization method for nonlinear dynamic system structure of high-speed light-load mechanism
ActiveCN105224770BMeet different design needsImprove performanceSpecial data processing applicationsAlgorithmNon linear dynamic
The invention discloses a method for carrying out structural topological optimization on nonlinear dynamic systems of high-speed light-load mechanisms. According to the method, the number of linear static structure optimization iterations in an ESLM (equivalent static loads method) is restricted according to the minimum number of iterations required by the structural topological optimization, so that the modifier in the optimization is restricted, the model error caused by equivalent load is reduced, and the structural topological optimization of the high-speed light-load mechanisms on the basis of structure restricted modified ESLM. According to the method, the equivalent load is considered as a function of a design variable, the optimization model is reconstructed, and a corresponding solving method is proposed, so that the residual amplitude is reduced as much as possible while the optimization condition is satisfied, compared with the standard equivalent static load, the amplitude under the same movement condition can be reduced by a half, the performance of the high-speed light-load mechanisms can be greatly improved and different design requirements of the high-speed light-load mechanisms can be satisfied.
Owner:GUANGDONG UNIV OF TECH
Hybrid optimization method for structural topology parameters of nonlinear dynamic system of high-speed light-load mechanism
ActiveCN105243231BMeet different design needsImprove performanceSpecial data processing applicationsTopology optimizationNon linear dynamic
The invention discloses a topological parameter hybrid optimization method for a nonlinear dynamic system structure of a high-speed light load mechanism. According to the method, a linear structure optimization iteration of a standard ESLM (equivalent static loads method) is defined into a single modification, so that a change of an inertial load caused by a structure modification is immediately reflected into an optimization model; a structure with the minimal equivalent load change is obtained; and aiming at a problem that a topological structure tending to 0 or 1 cannot be obtained by the single modification, the standard ESLM is further introduced to obtain a clear topological optimization structure, so that the hybrid optimization of the high-speed light load mechanism on the basis of a single or maximum iteration ESLM is achieved. According to the topological parameter hybrid optimization method, equivalent loads are considered into a function of a design variable; the optimization model is reconstructed; a corresponding determining method is provided; the residual amplitude can be lowered to the maximal extent under the condition of meeting optimization conditions; compared with standard equivalent static loads, the amplitude under the same motion condition can be lowered by a half; the properties of the high-speed light load mechanism are greatly improved; and different design requirements of the high-speed light load mechanism are met.
Owner:GUANGDONG UNIV OF TECH
Wind load simulation test method for double-pitched roof mobile house
ActiveCN110926753ASolve the wind resistance testSolve the problem of limited implementation of wind tunnel testsAerodynamic testingEngineeringMechanics
The invention relates to a wind load simulation test method for a double-pitched roof mobile house in the technical field of wind resistance detection of mobile houses. The wind load of the mobile house is converted into multi-point loaded equivalent static loads applied to main bearing components of a windward side and a north wind side through a transverse wind load analog loading device and a wind suction analog loading device; a step-by-step multi-point loading test is carried out so as to measure the displacement and the strain of each stressed beam column under each stage of wind load; the wind resistance performance of the prefabricated house structure is evaluated and verified, the loading mode and the graded loading process in the test process are simplified, graded loading and graded testing are conducted on main bearing components in a targeted mode, the safety of the test process is high, and meanwhile the problem that implementation of a large prefabricated house wind resistance test and a wind tunnel test is limited is solved.
Owner:中国人民解放军陆军研究院特种勤务研究所
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