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459 results about "Thermal force" patented technology
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Defect repairing method based on digital twinning and friction stir welding technology
The invention discloses a defect repair method based on digital twinning and friction stir welding technologies, and relates to the technical field of intelligent manufacturing and digital twinning, and the defect repair method comprises the following steps: synchronously capturing full-dimensional data of a welding area through a multi-mode sensor array integrated by an actuator; secondly, segmenting defect boundaries by adopting a deep learning algorithm, constructing a dynamic twin model in combination with thermal-force field coupling simulation, and accurately mapping defect three-dimensional features; generating a repair track according to the twinborn model, converting the repair track into a robot joint instruction through a curved surface parameterization mapping algorithm, and implanting real-time anti-collision constraint; in the repairing process, based on reinforcement learning control of the material rheological resistance and the temperature gradient, the rotating speed, the advancing speed and the down force of the tool are dynamically adjusted; and after repairing, micro-focus CT scanning is started immediately, actually measured data is compared with twinborn prediction, and when the deviation exceeds a threshold value, a re-repairing process is triggered automatically. The method solves the problems that a traditional method depends on manual intervention and the precision of a sensor is easily interfered by the environment.
Owner:SOUTHWEST TECHNICAL ENGINEERING RESEARCH INSTITUTE OF CHINA SOUTH IND GROUP
Early-age concrete anti-cracking reverse design method
PendingCN119830621ASustainable transportationDesign optimisation/simulationShrinkage crackingCrack resistance
The invention discloses an anti-cracking reverse design method for early-age concrete. Comprising the following steps: acquiring material performance parameters; constructing a chemical-thermal-force-phase field damage model of the early-age concrete; constructing a constitutive relationship between early-age behaviors and stress-strain of the concrete; carrying out shrinkage cracking simulation calculation on the early-age concrete, and quantitatively evaluating the damage cracking risk of the early-age concrete by using a damage development index Idd. And performing crack resistance optimization design on the early-age performance of the concrete by using an orthogonal design method to obtain a crack resistance optimization result in the performance combination and development process of the concrete. According to the method, the damage development index peak value is taken as a control target, the shrinkage cracking risk of the early-age concrete structure under different material properties, development processes, constraints and curing temperatures can be quantitatively evaluated, the optimal design of the concrete mix proportion is guided, a large amount of test exploration is avoided, the manpower and material resource cost is reduced, and the method is suitable for large-scale popularization and application. The method has important significance on early crack control of a concrete structure and has remarkable progress.
Owner:HOHAI UNIV
High-precision dynamic error real-time compensation method based on five-axis linkage
The invention discloses a high-precision dynamic error real-time compensation method based on five-axis linkage, and relates to the technical field of machine manufacturing, and the method comprises the following steps: multi-source dynamic error perception: collecting geometric errors of a machine tool through a grating ruler, collecting temperature field distribution through an infrared thermal imager, and collecting cutting force disturbance through a piezoelectric force sensor; the method comprises the steps of constructing a grating ruler, constructing a thermal infrared imager, constructing a multi-source data acquisition system, carrying out nonlinear coupling modeling, and establishing a dynamic error model based on improved Volterra series, and has the advantages that the multi-source data acquisition system is constructed through the grating ruler, the thermal infrared imager and the piezoelectric force sensor, geometric, thermal and force multi-source dynamic errors are sensed synchronously, and the dynamic error detection accuracy is improved. The nonlinear coupling characteristic of the thermal-force-geometric error is accurately quantified by combining an improved Volterra series model and Lyapunov exponent analysis, the problem that a traditional single-source error model cannot accurately describe a complex error field is solved, and the accuracy of error prediction is remarkably improved.
Owner:BIQIN AUTOMATION EQUIP (SHANGHAI) CO LTD
Rapid forming control system and control method for tempered glass production
The invention relates to the technical field of glass hot working control, and discloses a rapid prototyping control system and a rapid prototyping control method for tempered glass production. Comprising a thermal coupling module, a temperature control decision module, a flow field solving module, a photoelastic stress analysis module, a quantum annealing optimization module and a time domain synchronous control module. According to the system, a three-dimensional thermal-stress field is constructed on the basis of physical properties and thermal boundaries of glass, heating power is predicted through reinforcement learning, flow field simulation and stress image analysis are combined, control parameter self-adaptive adjustment is achieved through quantum annealing optimization, beats of all subsystems are coordinated through a synchronization module, and an efficient closed-loop control structure is formed. By introducing the quantum annealing optimization module, parameter adjustment in the control system is optimized, the technical effect of improving the precision of complex control decisions is achieved, and the optimization speed and the decision quality of the system are improved.
Owner:廖俊生
Thermal mechanical composite fatigue test equipment for turbine blade in rotating environment
ActiveCN121364073AGas-turbine engine testingJet-propulsion engine testingCombustion chamberSpray cooling
The invention belongs to the technical field of aero-engine high-temperature part test, and particularly relates to a thermal mechanical composite fatigue test device in a turbine blade rotation environment, which comprises a high-temperature gas system, a stator system, a rotor system, a support system, a test system, an auxiliary system and a turbine rotor blade test piece, the high-temperature fuel gas system is used for providing a fuel gas environment for a turbine rotor blade test piece and controlling the high-low temperature circulation state of fuel gas, a combustion chamber is arranged at the front end of the high-temperature fuel gas system and provided with a double-oil-way nozzle, a fuel gas flowing system is arranged at the rear end of the high-temperature fuel gas system, and a blade grid structure is designed for the fuel gas flowing system according to the geometrical shape of a turbine rotor blade. And a spray cooling section is arranged at the rear part of the test section. The device is composed of six core systems including a high-temperature fuel gas system, a stator system, a rotor system, a supporting system, a testing system and an auxiliary system, all the systems work cooperatively, and integrated simulation of the high-temperature fuel gas environment, rotating centrifugal loads and heat-force synchronous circulation is achieved.
Owner:SHENYANG AVIATION FUEL TECH CO LTD
Fabricated steel structure thermal expansion analysis and calculation method based on finite element method
PendingCN120217771ADesign optimisation/simulationMachine learningThermal forceMechanical engineering
The invention relates to the field of constructional engineering and structural design, and discloses a fabricated steel structure thermal expansion analysis and calculation method based on a finite element method.The fabricated steel structure thermal expansion analysis and calculation method comprises the following steps that fractal parameters are inversely optimized by constructing a thermal-force coupling equation and introducing an adjoint equation, errors of a temperature field and a displacement field are iteratively calculated, and the fractal parameters are updated; the convergence condition is met; the adjoint equation comprises an adjoint equation of a temperature field and an adjoint equation of a displacement field, and is used for calculating the gradient of the fractal parameter and performing back propagation optimization; in each iteration, recalculating the fabricated steel structure thermal expansion analysis model based on the updated fractal parameters, and judging whether a convergence condition is met or not; and finally outputting the optimized temperature field, displacement field and fractal parameters through repeated iterative optimization. According to the method, the calculation efficiency and optimization precision of thermal expansion analysis can be improved, the safety, stability and reliability of the steel structure under the thermal action are ensured, and the method is suitable for automatic analysis and optimization of a large-scale structure.
Owner:CHINA RAILWAY CONSTR GP OR GRP EAST CHINA ENG CO LTD +1
Composite material curing forming defect prediction method and system considering flow compaction process
The invention discloses a composite material curing forming defect prediction method and system considering a flow compaction process, and relates to the technical field of composite material curing forming simulation prediction. The method comprises a data acquisition step; a data preprocessing step; obtaining a curing degree field; and a corresponding parameter obtaining step. The system comprises a thermal-chemical coupling temperature field calculation module, a component material time-varying performance calculation module and a thermal-force coupling stress field calculation and flow-compaction calculation module which are connected in sequence. According to the method, resin flowing and fiber bed compaction characteristics are considered on the basis of existing research, and accurate prediction of two molding defects of thickness out-of-tolerance and non-uniform resin content generated after curing molding of the composite material structural member is realized.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Contact type thermal resistance dynamic measurement system and measurement method
The invention provides a contact type thermal resistance dynamic measurement system and a measurement method, and belongs to the technical field of thermal resistance measurement. According to the method, accurate characterization of the heat conduction characteristic of a complex interface is achieved through multi-physical field data fusion and a real-time compensation mechanism, firstly, initial reference pressure is set based on contact surface three-dimensional shape extraction and material attributes, and heat-force-flow multi-source data are synchronously collected through a multi-parameter measurement execution module; combining a weighted Kalman filtering algorithm and a phase change-seepage coupling correction model, and dynamically optimizing heat flow density data to eliminate phase change latent heat and micro-flow interference; and for abnormal fluctuation, a combined control strategy of fuzzy PID pressure regulation, high-frequency ultrasonic liquid film stabilization and porous silica gel vibration suppression is adopted, and + / -1% steady-state thermal resistance output is achieved. According to the method, cloud parameter iterative optimization and a fault self-diagnosis mechanism are integrated, and the robustness and reliability of measurement in dynamic high-noise scenes such as lithium battery pole piece expansion and geothermal wellbore unsteady-state heat transfer are remarkably improved.
Owner:ZHEJIANG SCI-TECH UNIV
Single-rod CHF test device and method
The invention discloses a single-rod CHF test device and method, and belongs to the field of thermal hydraulic tests. The single-rod CHF test device comprises a heating rod, a thermal insulation pipe and a fixed grillwork, the heating rod coaxially penetrates through the thermal insulation pipe and is radially limited by the fixed grillwork, a cooling medium is filled between the thermal insulation pipe and the heating rod, the diameter d of the heating rod and the inner diameter D of the thermal insulation pipe meet Dh = De = (D2-d2) / d, Dh is the thermal diameter corresponding to a simulated fuel rod, and De is the thermal diameter corresponding to the simulated fuel rod. De is the hydraulic diameter corresponding to the simulated fuel rod. According to the device, the thermal hydraulic characteristics of the full-length rod bundle fuel can be accurately simulated through the single heating rod, the cost of a CHF test is effectively reduced, and the test efficiency is improved.
Owner:SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
Internal combustion engine thermal characteristic virtual sensing method
The invention discloses a virtual sensing method for thermal characteristics of an internal combustion engine. The method comprises the following steps: S1, acquiring temperature distribution data; s2, time sequence temperature data mapping; s3, acquiring fusion temperature data; s4, obtaining thermal characteristics; and S5, abnormal judgment of a combustion chamber, an exhaust pipeline and a cooling system. According to the method, the comprehensiveness and the accuracy of thermal state analysis are remarkably improved by constructing a global sensing system of a three-dimensional space temperature field of the internal combustion engine and combining a multi-source sensor collaborative acquisition and deep learning feature fusion mechanism. Through closed-loop coupling of time-space sequence temperature data and a thermodynamic mechanism model, quantitative correlation between thermal characteristics and combustion efficiency, heat energy loss and cooling efficiency core performance parameters is established. According to the LSTM-CNN-MLP collaborative framework, the spatio-temporal evolution law of a temperature field is extracted in a self-adaptive mode, and the robustness of thermodynamic state perception is remarkably enhanced.
Owner:GUANGXI UNIV +1
Porcelain insulator quality evaluation system based on multi-physics field coupling analysis
The invention provides a porcelain insulator quality evaluation system based on multi-physics field coupling analysis, and relates to the technical field of rod-column porcelain insulator data processing.The porcelain insulator quality evaluation system adopts an electricity-heat-force multi-physics field joint simulation model to comprehensively reflect the heat accumulation and stress deformation effect caused by electric field concentration; an electric field concentration coefficient, a temperature rise trend coefficient and a stress gradient coefficient at a sharp point can be accurately captured, and degradation path prediction in a real operation environment is formed; according to the technology, the thread coupling abnormal index F alpha i of the ith rod-type column porcelain insulator is constructed, whether the thread structure has the risk of partial discharge, flashover or breakdown or not can be dynamically evaluated, and by introducing equivalent dielectric layer simulation of various environmental media, the simulation of the influence of various pollutants, attachments and climates on electric field concentration in reality is promoted; quantitative evaluation of the corona discharge risk of the sharp point is realized, and the reliability of the structural design of the insulator is promoted and improved.
Owner:LIAONING NORTH ELECTRIC PORCELAIN CO LTD
Thermal-mechanical-metallurgical coupling numerical simulation method for low alloy steel welding and additive manufacturing
PendingCN121052035ADesign optimisation/simulationConstraint-based CADHeat-affected zoneThermal force
The invention discloses a thermal-mechanical-metallurgical coupling numerical simulation method for low alloy steel welding and additive manufacturing, which comprises the following steps of: S1, constructing a three-dimensional model of a test piece according to the geometric size and the size of a heat affected zone of the test piece after welding or additive manufacturing, performing grid division to form grid units, and endowing the grid units with material attributes; s2, endowing the grid units with thermophysical attributes, introducing an external heat source model, solving the change of a temperature field along with time by using a finite element method until all the grid units are cooled to a set environment temperature, and exporting a temperature field model; s3, simulating a phase change process under any thermal process; and S4, calculating a stress-strain field and a displacement field by taking the temperature field model in the step S2 and the phase fraction model in the step S3 as driving external force. The temperature, phase fraction, stress-strain and displacement changes in the low alloy steel welding and additive manufacturing process can be predicted and analyzed faster and more comprehensively, the design period is shortened, and the economical efficiency of the implementation process is promoted.
Owner:JURASSIC MARKREWEI EQUIP TECH CO LTD
Method for refining grains on surface of tungsten material based on friction induction and application
The invention relates to the technical field of tungsten metal surface refinement, in particular to a method for refining grains on the surface of a tungsten material based on friction induction and application, and the method achieves grain refinement on the surface of refractory metal through the shear friction force and the thermal-mechanical coupling effect. Firstly, a tungsten material sample is in contact with a friction pair of a friction instrument, then a certain pressure is applied to the surface of the tungsten material through the friction pair, the material is heated to a preset temperature through a temperature control module, then rotary friction is conducted at a certain rotating speed, and after a period of time, a nanoscale gradient structure layer can be formed on the surface of the sample. By means of the method, the grain size can be refined to the nanometer level from the initial micrometer level, and the surface hardness of the material is greatly improved. The method is simple in process, low in cost and obvious in grain refinement effect, and has important engineering application value.
Owner:HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES
Additive manufacturing extrusion device and forming method based on heat-force synergistic densification enhancement
PendingCN119795325AAdditive manufacturing apparatusAuxillary shaping apparatusThermal forceAdditive layer manufacturing
The additive manufacturing extrusion device comprises a feeding hopper, a charging barrel, an auger, a nozzle, an electric heating roll shaft and a spring, the auger is installed on the upper portion in the charging barrel, two baffles are obliquely installed in the charging barrel space below the auger, and the two baffles are symmetrically arranged with the auger as the center; a first gap is formed between the two baffles, the baffles do not make contact with the packing auger, and the first gap is located under the packing auger; electric heating rollers are connected between the bottom of the charging barrel and the baffles through springs, the lower portions of the two baffles are each provided with one electric heating roller, a second gap is formed between the two electric heating rollers, and the diameter of the second gap is smaller than that of the nozzle; the spring is used for adjusting the size of the second gap between the two electric heating rolling shafts, so that the nozzle can uniformly discharge materials at the set rotating speed of the electric heating rolling shafts; and in the extrusion process, the electric heating roller is used for heating and compacting the material. And the density and the strength of the component are improved.
Owner:HEBEI UNIV OF TECH
Corrosion product deposition behavior numerical simulation analysis method and related device
The invention relates to a corrosion product deposition behavior numerical simulation analysis method and a related device, which are applied to a heat exchanger of a nuclear power plant residual heat removal system, and the method comprises the following steps: S1, establishing a three-dimensional geometric model corresponding to the heat exchanger based on a CFD platform; s2, performing grid division on the three-dimensional geometric model, setting boundary conditions and initial conditions of the three-dimensional geometric model, and establishing a thermal hydraulic model corresponding to the three-dimensional geometric model according to the grid division, the boundary conditions and the initial conditions; s3, calculating the thermal hydraulic model based on a FLUENT platform to obtain a temperature calculation result of a preset position of the heat exchanger; and S4, when the temperature calculation result meets the design value requirement, a corrosion product deposition and migration coupling model corresponding to the heat exchanger is established, and a sediment distribution result corresponding to the heat exchanger is calculated through the corrosion product deposition and migration coupling model based on the thermal hydraulic model. The method can predict the influence of corrosion product migration and deposition on the thermal performance of the heat exchanger.
Owner:SUZHOU NUCLEAR POWER RES INST CO LTD +1
Connecting device with function of dynamically adjusting clamping force
PendingCN120895918ACoupling device detailsClamped/spring connectionsThermal forceMonitoring and control
Owner:NINGDONG POWER SUPPLY COMPANY OF STATE GRID NINGXIA ELECTRIC POWER
Thermodynamic system of coupling back pressure turbine for wide-load peak regulation
The utility model relates to the technical field of steam turbines, and discloses a thermodynamic system of a coupling back pressure turbine for wide-load peak regulation, which is provided with a boiler, a back pressure turbine, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a generator and a recovery mechanism, the boiler is respectively connected with the back pressure machine, the high-pressure cylinder and the intermediate-pressure cylinder; the back pressure machine is connected with the high-pressure cylinder; the medium-pressure cylinder is connected with the low-pressure cylinder; the low-pressure cylinder is connected with the generator; the recycling mechanism is connected with the low-pressure cylinder and the boiler and used for condensing steam discharged by the low-pressure cylinder and recycling and conveying the steam to the boiler. In a high-load operation state, the thermodynamic system, the back pressure turbine and the high-pressure cylinder operate in parallel, and the boiler conveys steam to the back pressure turbine and the high-pressure cylinder. In the thermodynamic system in a low-load operation state, the back pressure machine and the high-pressure cylinder are connected in series for operation, the boiler conveys steam to the back pressure machine, and the back pressure machine conveys steam to the high-pressure cylinder. According to the utility model, the pressure of steam entering the steam turbine during low-load operation can be improved, and the feed water temperature and the operation economy can be improved.
Owner:DONGFANG TURBINE CO LTD
Thermal power generating unit deep peak regulation and efficient heat supply cooperative regulation and control method
The invention provides a thermal power generating unit deep peak regulation and efficient heat supply cooperative regulation and control method. The method comprises the steps of 1, thermodynamic modeling and performance analysis; 2, multi-section steam extraction optimal configuration; 3, designing a heat exchange and storage device; 4, dynamic regulation and control strategy development; and 5, verifying the system performance. According to the method, thermal performance and heat supply capacity of the unit under different load conditions are analyzed by constructing a thermal power unit thermodynamic simulation model, collecting operation parameters and performing thermotechnical calculation, steam distribution is optimized by adjusting the steam extraction proportion of a high-medium pressure cylinder and a low pressure cylinder, and meanwhile a heat exchange device and a heat storage device are designed and integrated. The method is used for balancing the heat supply capacity under the low-load and high-load working conditions. The dynamic regulation and control strategy further realizes real-time optimization and adjustment of combustion and heat supply, and ensures that the system stably operates under the deep peak regulation condition. Through simulation modeling and a dynamic regulation and control strategy, the heat energy utilization efficiency and the unit stability are effectively improved, meanwhile, coal consumption is reduced, and the deep peak regulation requirement is met.
Owner:INNER MONGOLIA JINGNING THERMAL POWER CO LTD
Building heat emission model modeling method and device, terminal and medium
ActiveCN120634777AData processing applicationsComplex mathematical operationsComputational simulationDensity of air
The invention discloses a building heat emission model modeling method and device, a terminal and a medium, and the method comprises the steps: firstly collecting building structure data and heat emission environment data of a target area, calculating artificial emission heat emitted by an air conditioner outdoor unit assembled on a building through an enthalpy difference method, and superposing the artificial emission heat to obtain dynamic heat emission data; dividing a heat storage space by taking an air conditioner position as an original point, and establishing a temperature change calculation formula in combination with a wind speed condition to calculate air flux change caused by a hot-pressing effect; thirdly, layering the urban canopies according to the vertical height, calculating the hot pressure difference formed by the air density difference of each layer, and constructing an interlayer heat transfer relationship; finally, integration of the coupling relation between the temperature rise data of the heat storage space and the thermal layer is achieved, the heat emission distribution and the temperature rise trend of the building in the target area under different wind speed conditions are simulated, and the technical problem that an existing heat emission temperature rise calculation simulation method is large in calculation error is solved.
Owner:GUANGDONG UNIV OF TECH
Shield tunnel thermal disaster diagnosis method and system based on deep learning
The invention discloses a shield tunnel thermal disaster diagnosis method and system based on deep learning, and relates to the technical field of information technology and tunnel safety monitoring, and the method comprises the steps: collecting an infrared image of an inner arc surface temperature field of a shield tunnel segment; performing chromaticity matching on the screened infrared image to obtain a matched temperature cloud picture; inputting the temperature cloud picture into the trained thermal-stress diagnosis model, and outputting a stress cloud picture; the training process of the model comprises the following steps: constructing a numerical model for simulating the thermal performance of the shield tunnel under the thermal-seepage-force multi-field coupling action; based on the numerical model, a temperature cloud picture and a stress cloud picture of a temperature field of the inner cambered surface of the shield tunnel segment are obtained through transient simulation calculation; training a thermal-stress diagnosis model based on a convolutional neural network by using the temperature cloud picture and the stress cloud picture; and based on the stress nephogram, in combination with a preset diagnosis basis, judging a shield tunnel thermal disaster early warning level and performing early warning in time. Accurate early warning of the safety and stability of the shield tunnel structure can be achieved.
Owner:QINGDAO UNIV OF TECH
Processing detection system and detection device for hydraulic shaft sleeve
The invention relates to the field of precision machining detection, and discloses a hydraulic shaft sleeve machining detection system and detection device which comprises a pneumatic servo control module, a signal collecting and processing module and a thermal inversion calculation module. The pneumatic servo control module drives the overturning air cylinder to apply a composite pressure waveform containing a static reference and a periodic flutter component to the hydraulic sleeve; the signal acquisition and processing module performs frequency domain analysis on a displacement signal detected by the displacement sensor and separates average displacement and displacement amplitude; the thermal inversion calculation module calculates real-time dynamic stiffness according to the displacement amplitude, a material stiffness thermal softening model is used for reversely deducing a temperature rise value, thermal expansion and elastic deformation errors are stripped through multi-dimensional error decoupling operation, and real height data under the standard temperature and without external force are calculated. According to the invention, active excitation and frequency domain analysis technologies are utilized, so that the interference of an oil film and thermal deformation is effectively solved, and high-precision online detection and processing compensation of a thermal-state workpiece are realized.
Owner:ZHEJIANG HIGWAY HYDRAULIC TECH CO LTD
Intelligent path planning system and optimization method for large structure robot welding
PendingCN120985664AProgramme-controlled manipulatorWelding/cutting auxillary devicesMachineVisual perception
The invention relates to the technical field of robot welding, in particular to an intelligent path planning system and optimization method for large structure robot welding, by collecting three-dimensional point cloud data of a workpiece and temperature field and stress field data in the welding process, a geometry-heat-force multi-field coupling model is established, and a machine learning algorithm is adopted for parameter correction; based on the model, a deep learning network is adopted to identify welding seam topological features and generate a path constraint parameter set; welding path nodes are optimized by using a hybrid optimization strategy of reinforcement learning and a multi-target genetic algorithm; monitoring the shape of a molten pool through a visual sensing system, and dynamically adjusting welding parameters in combination with a model predictive control algorithm; a distributed model predictive control algorithm is adopted to coordinate the motion trails of the multiple robots; and finally, constructing a welding process knowledge graph to realize continuous optimization of the system. The problems of inaccurate welding deformation prediction and poor path planning adaptability in the prior art are solved, and the welding quality and the production efficiency of the large structural part are remarkably improved.
Owner:HARBIN ELECTRIC MACHINERY FACTORY (ZHENJIANG) CO LTD
Cooling tower water temperature control method and device, electronic equipment and storage medium
The invention discloses a cooling tower water temperature control method and device, electronic equipment and a storage medium. According to the main technical scheme, the method comprises the steps that the unit load, meteorological parameters and the circulating cooling water amount of an indirect air cooling tower are obtained; based on the unit load of the indirect air cooling tower, the meteorological parameters and the monitored parameters of the circulating cooling water amount, thermal performance calculation is carried out to determine the thermal state of the cooling tower; according to the thermal performance calculation result, the target opening degree of the louver is determined, and the louver is controlled according to the target opening degree. Compared with the prior art, according to the embodiment of the invention, the unit load, the meteorological parameters and the circulating cooling water parameters are monitored in real time, thermal performance calculation is combined, the opening degree of the louver is adjusted in time, it is ensured that the tower outlet water temperature meets the unit operation requirement, and by optimizing the opening degree of the louver, the energy consumption of the cooling tower can be reduced, and the operation cost is reduced. On the premise that the cooling effect is guaranteed, energy conservation and emission reduction are achieved, and the development concept of environmental protection is met.
Owner:INNER MONGOLIA HELIN POWER GENERATION CO LTD
Performance-based fire-resistant design method for cable system of large-span suspension bridge
The invention discloses a performance-based fire-resistant design method for a cable system of a large-span suspension bridge. The method comprises the steps of bridge fire-resistant category division, fire intensity division, fire-resistant target determination, adverse fire scene determination, fire response calculation, fire-resistant checking calculation, fire-resistant protection and the like. The bridge fire-resistant category, the fire intensity, the fire-resistant performance and the fire-resistant target are all divided into three levels. The adverse fire scene is determined based on the fire type, fire combustion mode, fire position, wind speed and wind direction influence and combined with the structure stress state; fire response is calculated through thermal-mechanical coupling by adopting a finite element method; the fire-resistant checking calculation can adopt a design method based on overall structure fire-resistant checking calculation or component fire-resistant checking calculation; and when the fire-resistant checking calculation of each component of the cable system does not meet the fire-resistant target, fire-resistant protection design is carried out, and a fire-resistant protection scheme is designed by combining tests and numerical simulation. The fire-resistant design method based on the performance of the suspension bridge cable system is constructed, and reference can be provided for fire-resistant design of the suspension bridge.
Owner:NANJING TECH UNIV
Multi-physical-field intelligent optimization system and method for low-thermal-resistance stacked electrode packaging
PendingCN121525605AComputer aided designSpecial data processing applicationsData acquisitionClosed loop
The invention discloses a multi-physical-field intelligent optimization system and method for low-thermal-resistance stacked electrode packaging, and relates to the technical field of packaging thermal management. According to the system, a thermal, mechanical and electric multi-physics field coupling model of the stacked electrode packaging structure is established in a unified computational domain through a modeling module; the measurement module collects thermal resistance, thermal conductivity and interface stress data in real time through an integrated sensor; the self-correction optimization module executes a self-adaptive residual iterative algorithm based on the deviation between the model simulation result and the actually measured data, corrects model parameters and generates process control variables; and the process regulation and control module dynamically adjusts the sintering temperature, the coating thickness and the pressing pressure according to the control variables and feeds back updated data to form closed-loop optimization. According to the method, collaborative operation of modeling, measurement, optimization and process regulation and control is realized, dynamic self-correction of multi-physical field parameters and process adaptive optimization can be realized in the packaging operation process, the interface thermal resistance is remarkably reduced, and the heat-conducting property and the structural stability are improved.
Owner:YANGZHOU JIANGXIN ELECTRONICS CO LTD
Electromagnetic-thermal-mechanical full-coupling simulation design method and system for SiC controller
The invention provides a SiC controller electromagnetic-thermal-force full-coupling simulation design method and system, and belongs to the technical field of power electronic device simulation design, and the method comprises the steps: constructing a bidirectional real-time coupling model of an electromagnetic field, a thermal field and a mechanical stress field; the irradiation dose is determined based on the expected working environment of the SiC controller, irradiation damage factors are introduced to correct SiC material parameters, and a bidirectional real-time coupling model is input; different temperature conditions and stress conditions are input into the bidirectional real-time coupling model for multi-working-condition simulation, performance parameters of the SiC material are output, and a quantitative relation model of the performance parameters, the temperature and the stress is established to reveal the performance degradation law of the SiC material; and based on the bidirectional real-time coupling model and the performance degradation law of the SiC material, taking the switching loss and the temperature rise as optimization targets, and carrying out collaborative optimization on parameters of the SiC controller. The simulation precision is improved, the performance of the SiC controller is optimized, the reliability is improved, and the service life is prolonged.
Owner:SINO TRUK JINAN POWER CO LTD
MOTOR VEHICLE COMPRISING EXHAUST THERMAL PROTECTION BY ENGINE TORQUE RESTRICTION, METHOD AND PROGRAM BASED ON SUCH A VEHICLE
The invention relates to a motor vehicle comprising a heat engine, an exhaust line, and a thermal protection system which comprises: - a means for evaluating the temperature of the exhaust line (M1); - a means for evaluating temperature criticality (M2) between a low level 1 without risk of degradation of the components of the exhaust line; an intermediate level 2; and a high level 3 with said risk; - a means for cooling (M3) the heat engine above level 2 so as not to degrade the performance of the heat engine; and - a limiting means (M4) limiting the heat engine above level 3, by limiting the torque of the heat engine in the event of overheating of the exhaust line. The invention also relates to a method and a program based on such a vehicle. Figure 1
Owner:STELLANTIS AUTO SAS
Damage-considered solder bump viscoplastic constitutive model establishing method
PendingCN120524750AMaterial strength using tensile/compressive forcesDesign optimisation/simulationElement modelThermal force
The invention relates to a method for establishing a viscoplastic constitutive model of a solder bump considering damage. Comprising the following steps: performing a uniaxial tension and compression test on a solder bump sample to obtain a macroscopic stress-strain curve of the sample; a unit cube finite element model is established, the unit cube finite element model adopts the solder constitutive model constructed in the step (2), loads are set for the model for numerical simulation, and a stress-strain curve calculated by the model is obtained; and fitting the stress-strain curve obtained by simulation in the step (3) with the macroscopic stress-strain curve obtained by the tension and compression test in the step (1) through a test parameter method, and determining parameters of the solder constitutive model, so that the final solder bump viscoplastic constitutive model considering the damage is established. The method can accurately predict the deformation and other mechanical behaviors of the solder under the thermal-force loading condition, and can be widely applied to fatigue life prediction and reliability evaluation of the electronic packaging structure.
Owner:NANJING UNIV OF SCI & TECH
Molten pool dynamic simulation model and system for simulating laser drilling based on level-set method
PendingCN120781592ADesign optimisation/simulationSpecial data processing applicationsMathematical modelDynamic monitoring
The invention provides a molten pool dynamic simulation model and system for simulating laser drilling based on a level-set method, and the model comprises a two-dimensional molten pool simulation model which comprises heat transfer-laminar flow (two-phase flow) and level-set physical field coupling; on the basis of the confirmed implementation process parameters and material physical property parameters, a molten pool interface simulation metallographic phase under given process operation is compared with an actual metallographic phase, and a heat transfer mathematical model in the laser drilling process is obtained through simulation confirmation; and the three-dimensional thermal-mechanical coupling model is constructed based on a heat transfer mathematical model and further coupled with a solid mechanical physical field, so that temperature distribution and stress distribution at the welding printing position in the laser drilling process are obtained through simulation. The technical problems that in an existing laser drilling welding technology, parameter debugging depends on experience, dynamic monitoring of a molten pool is difficult, and thermal stress prediction means are lacked can be effectively solved, and powerful theoretical support and data basis are provided for optimizing the welding technology and improving the welding quality.
Owner:JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
A cooling tower adaptive air intake regulation system and method coupled with flow guiding energy saving
An adaptive air intake control system and method for cooling towers, coupled with airflow diversion for energy saving, belongs to the field of adaptive control system technology. The system includes an information acquisition unit, an execution unit, and an adaptive control unit. The information acquisition unit collects environmental wind parameters and key operating parameters in real time. The execution unit includes multiple independent fan blade groups with circumferential partitioning and vertical layering for precise execution of commands. The adaptive control unit executes operational decisions, selecting the dominant operating mode from airflow diversion energy saving, anti-freezing energy saving, and anti-drip energy saving modes; it then identifies and outputs wind condition characteristics and thermal anomaly indicators through key parameter status identification, and generates control commands based on the adaptive control strategy and command generation. The system forms a closed loop, capable of adaptively adjusting the identification model and control strategy based on feedback. A corresponding control method is also disclosed, enabling intelligent and precise control of air intake in cooling towers under complex environments, improving cooling efficiency and energy saving while ensuring anti-freezing safety.
Owner:济南蓝辰能源技术有限公司