23 results about "Thermal mechanical coupling" patented technology

The invention provides a clutch pressure plate thermal deformation simulation method, system and device and a medium, and belongs to the technical field of automobile clutches. A three-dimensional model of a dry diaphragm spring clutch is obtained, and a clutch heat engine coupling deformation finite element model is established; setting a constraint set point at a preset position; calculating the density of heat flow applied to the friction surface of the pressure plate; respectively calculating a pressure plate temperature field simulation result and a pressure plate thermal mechanical coupling deformation simulation result; outputting a calculation result as a simulation result file; and configuring the thermomechanical coupling deformation simulation result of the pressure plate to the temperature distribution cloud chart of the pressure plate, respectively extracting and analyzing the axial displacement of the inner side and the outer side of the friction surface of the pressure plate, and calculating to obtain the thermomechanical coupling deformation of the pressure plate. According to the method, multiple aspects such as heat flow density application, heat conduction, mechanical load application and heat engine coupling are comprehensively considered, the actual working condition of the clutch can be reflected, and the design and optimization requirements of the clutch are met.

The invention discloses a flip chip FC packaging technology method, and relates to the technical field of chip packaging, and the method comprises the steps: collecting the physical parameters of a flip chip packaging material, building a thermal-mechanical coupling model, carrying out the thermal-mechanical coupling simulation and mechanical stress analysis of a packaging structure through the built thermal-mechanical coupling model, and carrying out the analysis of the mechanical stress of the packaging structure. And a stress concentration area and a part with large deformation are identified, and optimization design of the packaging structure is carried out based on a thermal-mechanical coupling analysis result. The reliability of the packaging structure is remarkably improved through optimization design and a strict testing process, in the design stage, a stress concentration area and a potential deformation problem are analyzed and recognized through thermal-mechanical coupling, so that the geometrical shape, material selection and solder ball layout are optimized in advance, and the reliability of the packaging structure is improved through optimization of a thermal management strategy. The heat management performance of the packaging structure is effectively improved, the heat dissipation efficiency of the packaging structure is remarkably improved, and the packaging structure can better adapt to application scenes with extremely high requirements for heat management.

A phase change material cantilever beam structure light-heat-mechanical coupling performance joint simulation method comprises the following steps: integrating a wave optics module, a solid heat transfer module and a solid mechanics module in multi-physics field simulation software (such as COMSOL), and constructing a three-dimensional model containing a photon metamaterial layer and a phase change material cantilever beam; a light-heat-mechanical basic coupling framework is formed through a temperature correlation interpolation function; setting conditions such as photon metamaterial boundary excitation and cantilever beam anchor region constraint; optical-thermal-mechanical closed-loop iterative coupling is realized by using an electromagnetic thermal interface and a thermal expansion interface; a free tetrahedral mesh is adopted, and a tip contact area of the cantilever beam is refined; influences of incident light wavelength and the like on light absorption and a temperature field are analyzed through parameter scanning, and structural parameters are optimized. According to the method, the problem that traditional cantilever beam simulation lacks multi-physics field coupling is solved, full-chain dynamic simulation is achieved, device design efficiency and precision are improved, parameter matching is optimized, technical support is provided for device design, cost is reduced, and related MEMS sensor development is assisted.

The present application provides a method, system, equipment and medium for predicting the fire resistance performance of on-board hydrogen storage cylinders, which belongs to the field of hydrogen storage cylinder application technology. The method includes: establishing a mechanical property degradation model of carbon fiber epoxy resin-based composite materials at high temperature and a mechanical response finite element model of on-board hydrogen storage cylinders under thermal-mechanical coupling; applying the mechanical property degradation model to the mechanical response finite element model, and performing finite element analysis in combination with the cylinder fire failure criterion to obtain a first change curve, which characterizes the relationship between the degree of fire failure of the on-board hydrogen storage cylinder and the gas pressure in the cylinder; obtaining a second change curve, which characterizes the change law of the gas pressure in the cylinder of the on-board hydrogen storage cylinder with the fire time; combining and analyzing the first change curve and the second change curve according to the cylinder fire failure criterion to obtain the bursting pressure and fire resistance time of the on-board hydrogen storage cylinder under fire. The present application can reliably predict the fire resistance performance parameters of on-board hydrogen storage cylinders.

The application discloses a large liquid carbon dioxide ship low-temperature steel plate and a preparation method thereof, and belongs to the field of steel metallurgy. The main chemical components of the steel plate are C, M, Si, Ni, Ni+Cu+Cr, Nb, Al, Ti, Nb+Al+Ti, S, P, and the rest are Fe and inevitable impurity elements. The clean steel smelting process is adopted to prepare a large-thickness continuous casting billet with high purity and high homogenization. The fine quasi-polygonal ferrite+acicular ferrite+carbide-free bainite structure is obtained through low-temperature large reduction (compression ratio greater than or equal to 7) hot mechanical coupling rolling+two-stage controlled rolling and controlled cooling. The large liquid carbon dioxide ship low-temperature steel plate is produced by adopting the TMCP process, has the advantages of large thickness, high strength, -60 DEG C CTOD and the like, meets the construction requirements of the large liquid carbon dioxide ship with low temperature and low pressure, has the advantages of simple manufacturing process, short production period and low alloy cost, and will greatly promote the large-scale development of the liquid carbon dioxide ship.

The invention belongs to the field of steam turbine safety assessment, and discloses a steam turbine blade safety margin dynamic assessment method, which can obtain the unsteady aerodynamic load distribution of the blade surface under the real geometric and dynamic load conditions by establishing a parameterized three-dimensional finite element model and carrying out transient CFD simulation, and has the advantages that compared with the traditional static working condition hypothesis, the dynamic assessment method has the advantages that the efficiency is high; the influence of dynamic load changes such as power grid AGC adjustment, deep peak regulation and quick start and stop on blade stress and temperature fields can be accurately reflected, so that the authenticity and timeliness of load input are improved. After the aerodynamic load is mapped to a structural mechanical model, the distribution rule of the multi-axis complex stress state of the blade can be obtained by combining centrifugal stress and thermal mechanical coupling stress calculation, and an accurate basis is provided for subsequent safety margin calculation.

The invention belongs to the technical field of power module design, discloses a power module reliability optimization design method, system and equipment based on the thickness of a solder layer and a medium, and aims to solve the problem that the optimal thickness of the solder layer cannot be accurately determined in the prior art. The method comprises the steps that a thermal-mechanical coupling simulation model is constructed, and thermal stress distribution data are obtained through simulation with the thickness of a solder layer as a variable; selecting a theoretical optimal thickness and a rapid change area representative thickness based on a simulation result to prepare a sample, and determining the thickness with a slow aging speed as a first optimal thickness through a power cycle experiment; scanning the aged sample to calculate the porosity, and determining the thickness with smaller porosity as a second optimal thickness; and carrying out collaborative analysis on the three, directly determining if the three are consistent, otherwise, taking the first optimal thickness as the criterion. According to the method, simulation-experiment-observation integrated optimization is realized, and the scientificity and the accuracy of the thickness design of the solder layer are remarkably improved.

The present application belongs to the technical field of generator, and provides a generator winding insulation failure prevention method based on coating electrostatic spraying, which can accurately simulate the accelerated aging and failure of the generator stator winding under the condition of thermal-mechanical coupling load. And according to the experimental device, an improved coating electrostatic spraying process is proposed to effectively improve the insulation damage of the stator winding. Finally, through the analysis of the insulation performance of the stator winding, the effectiveness of the improved process is proved. It is conducive to studying the influence of mechanical load, thermal load and coupling load on the insulation response and the stator insulation aging condition and performance change trend through experimental simulation, and provides a solid foundation for effectively preventing the shutdown failure of the generator winding insulation due to wear.

The invention provides an ultrasonic magnetic field assisted low-speed wire cut electrical discharge machining microstructure simulation method, belongs to the technical field of wire cut electrical discharge machining, and aims to introduce ultrasonic waves and a magnetic field into existing low-speed wire cut electrical discharge machining, establish a thermomechanical coupling model, and combine finite element analysis and a cellular automaton model to simulate the microstructure of the low-speed wire cut electrical discharge machining. Accurate simulation is performed on distribution of a temperature field, a stress field and a strain field in the machining process, and meanwhile, dynamic evolution of crystal grains in a material cutting surface metamorphic layer is simulated through a cellular automaton, so that a visual microstructure evolution simulation result is obtained. According to the method, surface microstructures of materials such as shape memory alloy are remarkably improved by introducing ultrasound and a magnetic field, the grain size is reduced, and the uniformity of grains is improved; ultrasonic, magnetic field and thermomechanical coupling are combined, the influence of different factors on the microstructure of the material can be comprehensively considered, the limitation of a single factor in the prior art is broken through, and therefore more efficient machining optimization is achieved under the complex technological condition.

The invention belongs to the technical field of new energy wind power generation, and discloses an IGBT module failure prediction method and system, and the method comprises the steps: obtaining electric stress data, thermal stress data and mechanical stress data of a to-be-detected IGBT module, carrying out the time-space alignment processing, and obtaining a multi-dimensional feature vector of the to-be-detected IGBT module; performing multi-physical field coupling effect quantitative modeling based on the multi-dimensional feature vector to obtain a coupling feature matrix; the coupling characteristic matrix comprises a corrected electrical-thermal coupling coefficient, a thermal-mechanical coupling coefficient, a normalized electrical-mechanical coupling coefficient, a maximum temperature gradient and strain dominated by mechanical stress; inputting the coupling characteristic matrix into a pre-constructed coupling sensitive failure prediction model, and outputting to obtain a predicted failure cycle index of the to-be-tested IGBT module; according to the method, the accuracy, comprehensiveness and timeliness of IGBT module failure prediction are effectively improved, and a scientific basis is provided for IGBT model selection, life prediction and inverter system optimization.

The invention discloses a selective laser melting forming method and application for reducing the porosity of nickel-based superalloy.The method comprises the steps that a nickel-based alloy workpiece is prepared through selective laser melting, then the nickel-based alloy workpiece is subjected to subzero treatment in liquid nitrogen at the temperature of-196 DEG C for 10-60 min, then the nickel-based alloy workpiece is placed at the high temperature of 650 DEG C for heat preservation for 10-60 min, and through multiple cooling-heating cycles, the porosity of the nickel-based superalloy is reduced; the thermal mechanical coupling effect and microstructure regulation and control are combined, the density and comprehensive performance of the selective laser melting formed nickel-based alloy are remarkably improved, the porosity of the nickel-based high-temperature alloy can be reduced to 0.1% or below, and efficient pore closing is achieved. And meanwhile, dynamic release and redistribution of thermal strain in the circulation process are achieved, local stress concentration is effectively reduced, microcrack initiation is inhibited, the fatigue life of a component is prolonged, and the problems that in the prior art, nickel-based high-temperature alloy is treated at high temperature and high pressure, so that the yield strength is reduced, and the high-temperature durability is degraded are solved.

The application is suitable for the technical field of computer-aided fuel nozzle design, and particularly relates to a coupling design method and equipment for a fuel nozzle needle valve cone angle and a seat surface stress, comprising: obtaining a design variable vector and a target performance vector; generating a geometric model based on the design variable vector; performing thermal analysis and thermal-mechanical coupling analysis on the geometric model to obtain an analysis result; calculating a performance index of the geometric model based on the analysis result; judging whether a convergence condition is met according to the performance index and the target performance vector, and if the convergence condition is met, determining the geometric model as a final design model; if the convergence condition is not met, updating the design variable vector based on the performance index and the target performance vector; and iterating the above process until the convergence condition is met. The method can improve the sealing performance of the fuel nozzle and the engineering applicability of the design result.

The invention relates to the technical field of power supply equipment, and discloses a combined electric appliance pipeline transverse displacement U-shaped compensation unit displacement monitoring method and equipment, and the method comprises the steps: building a structure analysis model based on the material parameters and geometric structures of a to-be-detected combined electric appliance pipeline and a U-shaped compensation unit through employing a three-dimensional finite element; collecting temperature distribution data and actual displacement of the to-be-detected composite apparatus pipeline in real time; mapping the temperature distribution data into grid nodes of the structural analysis model to obtain a thermal-mechanical coupling model; inputting the temperature distribution data as a boundary condition into a thermal-mechanical coupling model, solving a transverse displacement field of the U-shaped compensation unit by using a sequential coupling method, and obtaining a transverse displacement component as a theoretical displacement amount; and calculating a deviation value between the theoretical displacement and the actual displacement, and if the deviation value exceeds a preset threshold value, determining that the displacement of the to-be-detected combined electric appliance pipeline is abnormal.

The invention discloses an anti-scald curling iron with a thermal trigger self-locking structure, and belongs to the technical field of personal care electric appliances. The curling iron comprises a handle unit, a heating cylinder unit, a protective cover unit and a sliding rotary lock catch unit. The sliding rotary lock catch unit comprises a sliding track mechanism, a rotary trigger mechanism and a thermal trigger lock catch mechanism; the sliding rail mechanism achieves stable switching of the protective cover between the using position and the protective position. The rotary triggering mechanism guides the protective cover to rotate when the protective cover reaches the protective position; the thermal triggering lock catch mechanism automatically drives a spring bolt to complete locking at high temperature through a bimetal temperature-sensitive element; intelligent safety protection is achieved through thermal mechanical coupling, and the problem that a traditional protective cover is manually forgotten to be locked and the locking state is disjointed with the thermal risk of equipment, so that the scalding hidden danger is caused is solved.

The present invention provides a method and system for analyzing thermo-mechanical coupling effects based on elastic connection, belonging to the field of stress analysis in the branch of elasticity. The method includes: constructing the boundary conditions of the heat balance equation for a model with an elastomeric constraint at one end of the object according to the measured environmental temperature; obtaining the dynamic temperature field equation for other regions of the model through the boundary conditions of the heat balance equation for a model with an elastomeric constraint at one end of the object; solving the stress fields at various locations in the model with an elastomeric constraint at one end of the object according to each temperature field; and obtaining the kinematic equations of the mechanical structures of each part of the object according to the stress fields at various locations in the model with an elastomeric constraint at one end of the object, and in combination with the thermal stress model and the elastomeric model, thereby analyzing the thermo-mechanical coupling effects. The present invention establishes a dynamic method considering thermal effects, which can be used to predict the thermal disturbance response of the measurement system of large space vehicles.

The invention relates to the technical field of electrical detection, and discloses a high-voltage current transformer automatic calibrating device which comprises an integrated testing base, an open type supporting structure is arranged in the center area of the surface, and a temperature control element and a force sensor array are embedded in the integrated testing base. An adjustable mechanical fixing clamp is arranged around the open type supporting structure, and the force sensor array is connected with an external data acquisition system; the thermal mechanical coupling self-calibration system comprises a partition temperature control unit and a programmable mechanical load applicator; the data fusion analysis unit performs real-time data processing and analysis by adopting a thermal mechanical coupling model and is used for constructing a performance curve of the high-voltage current transformer under a specific temperature and mechanical load combination; according to the invention, the cooperative control of the temperature field and the mechanical stress field is realized, the thermomechanical coupling state of the high-voltage current transformer in the actual operation environment is accurately simulated, and the deviation between the verification result and the actual operation state is reduced.

The invention discloses a method and a device for designing and loading a crack propagation simulation part of a typical stator part at a hot end of an aero-engine, and belongs to the technical field of aerospace engines. According to the method, alternation of a thermal load is simulated through alternation of a mechanical load, a load spectrum is obtained by performing static strength analysis on a simulation piece at the highest working temperature, the mechanical load is applied by synchronizing the thermal cycle period of a real structure in the test process through the load spectrum, and the mechanical behavior of the turbine guide vane under the complex load condition is reflected. According to the invention, conventional force loading is replaced by displacement loading, so that the problem of thermal mechanical coupling effect simulation distortion in the design of a typical hot-end stator part simulation part of an aero-engine is solved; a crack closing effect is considered, a stress intensity factor during crack opening is introduced and compared with a conventional stress intensity factor amplitude, an effective stress intensity factor range is comprehensively considered and determined, and the problem that a conventional crack propagation model cannot accurately reflect specific thermodynamic coupling characteristics of a typical hot-end stator part is solved.

The invention belongs to the technical field of generators, and provides a generator winding insulation failure prevention method based on coating electrostatic spraying, which can accurately simulate accelerated aging and failure of a generator stator winding under the condition of thermal-mechanical coupling load. And a coating electrostatic spraying improvement process for effectively improving the insulation damage of the stator winding is provided according to an experimental device. Finally, the effectiveness of the improved process is proved by analyzing the insulating property of the stator winding. The method is beneficial for researching the influence of mechanical load, thermal load and coupling load effects on insulation response, the stator insulation aging condition and the performance change trend through an experimental simulation mode, and provides a solid foundation for effectively preventing shutdown faults caused by abrasion of generator winding insulation.

The invention is suitable for the technical field of computer-aided oil nozzle design, and particularly relates to an oil nozzle needle valve cone angle and seat surface stress coupling design method and device. Generating a geometric model based on the design variable vector; performing thermal analysis and thermal-mechanical coupling analysis on the geometric model to obtain an analysis result; calculating a performance index of the geometric model based on the analysis result; according to the performance index and the target performance vector, whether a convergence condition is met or not is judged, and if the convergence condition is met, the geometric model is determined as a final design model; if the convergence condition is not met, updating the design variable vector based on the performance index and the target performance vector; and iterating the process until the convergence condition is met. According to the method, the sealing performance of the oil nozzle and the engineering applicability of a design result can be improved.

This disclosure provides a method for controlling the interfacial microstructure and properties of TiAl / Ti2AlNb alloy diffusion-bonded joints, comprising: subjecting the TiAl / Ti2AlNb alloy diffusion-bonded joints to electro-pulse treatment and thermomechanical treatment respectively; wherein the electro-pulse parameters are: pulse voltage of 30~50V, pulse frequency of 120~180Hz, and pulse time of 10~30s; the thermomechanical treatment parameters are: deformation temperature of 1050℃~1150℃, holding time of 20~40min, and deformation controlled below 15%, wherein the deformation direction during the thermomechanical treatment is parallel to the alloy diffusion-bonded interface. This invention employs an integrated technology of post-weld electro-pulse and thermomechanical coupling treatment, which can eliminate the defect of equal brittleness at the interface of the TiAl / Ti2AlNb alloy joint, while simultaneously allowing for more complete microstructure evolution, a more uniform and finer diffusion layer microstructure, and ultimately resulting in better strength and toughness at the TiAl / Ti2AlNb alloy joint, yielding a bi-alloy material with excellent comprehensive mechanical properties.

The invention relates to a hot bending coupling loading experiment device for a circuit board, and belongs to the technical field of electronic packaging reliability testing. The device comprises a heating system and a bending loading system. The heating system controls the temperature of the experimental environment through the heat preservation box, the heating resistance wire, the temperature controller and other components, and the heating process is controllable and stable. The bending loading system realizes fixation and bending loading of a circuit board sample piece through linkage of a double-stud supporting column, a micrometer and a T-shaped supporting column, and can adapt to circuit boards with different thicknesses. The device is compact in structure, flexible to adjust and suitable for testing the thermal-mechanical coupling performance of the circuit board.

The present invention discloses a flip-chip FC packaging technology method, which relates to the field of chip packaging technology. The physical parameters of the materials for flip-chip packaging are collected, and a thermal-mechanical coupling model is established. Using the established thermal-mechanical coupling model, thermo-mechanical coupling simulation and mechanical stress analysis are carried out on the packaging structure to identify the stress concentration areas and the parts with large deformations. Based on the results of the thermal-mechanical coupling analysis, an optimized design of the packaging structure is carried out. Through optimized design and strict testing procedures, the present invention significantly improves the reliability of the packaging structure. In the design stage, thermal-mechanical coupling analysis is used to identify the stress concentration areas and potential deformation problems, so as to optimize the geometry, material selection and solder ball layout in advance. Moreover, by optimizing the thermal management strategy, the thermal management performance of the packaging structure is effectively improved, and the heat dissipation efficiency of the packaging structure is significantly increased, enabling the packaging structure to better adapt to application scenarios with extremely high requirements for thermal management.

The invention discloses a finite element-based high-voltage direct-current cable temperature and current-carrying capacity calculation model and method, and the method comprises the steps: obtaining temperature change characteristic parameters of each layer of material of a cable, including a heat conductivity coefficient, a specific heat capacity, a thermal expansion coefficient and an elastic modulus, and obtaining a function relation of the heat conductivity coefficient, the specific heat capacity, the thermal expansion coefficient and the elastic modulus along with the temperature change; establishing a two-dimensional geometric model of the cable in finite element simulation software, and setting a temperature change parameter function of each layer of material of the cable; building a multi-physical field coupling model, and introducing a thermal-mechanical coupling item, so that mechanical loss generated by thermal expansion is fed back to a thermal field model in a negative heat source form; and solving the multi-physics field coupling model to obtain the temperature field distribution and the corresponding current-carrying capacity of the cable under the steady-state operation condition. The method has higher precision, the error of the final calculation result reaches 0.33% and is smaller than 1%, accurate calculation is achieved, and the index is remarkably superior to that in the prior art.