9 results about "Transient stress" patented technology

This application discloses a digital twin analysis method and device for coke tower strain based on the cold point effect, relating to the field of coke tower stress analysis technology. The method includes: constructing a three-dimensional solid model based on point cloud data; constructing a structural digital twin model of the target coke tower based on the three-dimensional solid model; determining the region with the largest bulging on the target coke tower shell and continuously collecting the metal wall temperature-operation time curves at each monitoring point within the current working cycle; compiling the load steps of the cold point temperature loading history based on the metal wall temperature-operation time curves of the non-cold point region and the cold point region, and determining the digital twin temperature field of the target coke tower; obtaining the digital twin stress-strain analysis results through transient stress analysis in finite element software. This application performs digital twin simulation of the strain of coke tower equipment by considering the cold point effect of in-service coke towers and combining temperature monitoring statistics with finite element numerical analysis.

This invention relates to the field of power equipment condition monitoring technology, and discloses an online monitoring and evaluation device and method for series compensation capacitors. The method includes: acquiring operating signals and extracting steady-state operating characteristics and transient characteristic parameters; combining historical cumulative fatigue damage, calculating the dynamic frequency-varying equivalent series resistance modulated by the damage positive feedback effect, and substituting it into the thermal differential equation to iteratively calculate the dynamic hot spot temperature sequence; for transient events, constructing a cross-coupling term characterizing the synergistic effect of electrodynamics and thermomechanical softening, and calculating the high-frequency equivalent partial discharge; performing thermomechanical softening correction on the transient overvoltage peak to obtain the thermomechanical equivalent transient stress, and dynamically updating the electro-thermal-mechanical coupled cumulative fatigue damage by combining real-time dynamic hot spot temperature and high-frequency equivalent partial discharge; finally outputting a health status index. This invention integrates the time-varying evolution of thermal stress and the multi-physics field transient synergistic damage mechanism, significantly improving the accuracy of equipment damage quantification.

The application discloses a turbine disc creep-fatigue test load determination method and belongs to the technical field of aero-engines. The method comprises the following steps: performing transient stress and creep analysis on a turbine disc, calculating fatigue damage components and creep damage components in each stage, and accumulating total fatigue damage values and total creep damage values in a complete flight cycle; determining a flight state with the maximum total damage as a standard cycle; taking the standard cycle as the only reference, a complete set of test parameters are determined: the maximum creep damage state temperature is set as a test temperature, the maximum stress is used to determine a test rotating speed, the test cycle number is determined by backstepping, and the peak value holding time is determined by backstepping. The application realizes the cooperative and accurate design of thermal-mechanical loads, ensures that the test highly simulates actual working conditions, and provides a scientific basis for engine life determination.

The application provides a door and window production quality management method and system, relates to the door and window production quality management field, obtains performance data of doors and windows in actual use environment, identifies performance decline events, extracts environmental condition information and performance change information before and after the occurrence of the performance decline events, constructs scene feature description, traces back to the whole life cycle quality data of the doors and windows based on the scene feature description, identifies potential deviations activated and shown under specific transient stress corresponding environmental conditions, generates quality problem attribution reports and optimization suggestions according to the identified potential deviations, and can effectively solve the technical problems that in the prior art, when performance of door and window products declines in long-term operation, it is difficult to establish a clear cause-and-effect chain, and potential reasons cannot be effectively identified and attributed, so that the long-term reliability and user satisfaction of the door and window products are significantly improved.

The invention belongs to the field of finite element simulation laser-assisted micro-milling, and relates to a prediction method for residual stress of a laser-assisted micro-milling nickel-based superalloy. The method comprises the following steps: establishing a geometric model of the micro-milling cutter and a workpiece, and dividing a cutting area by adopting a transition encryption grid; in explicit dynamics solution, a VVDLUX subprogram is called to load a Gaussian distribution laser heat source moving along with time, a Johnson-Cook constitutive model and a damage failure criterion thereof are combined to describe material heat-force response and chip separation, and a transient stress field after machining is obtained; and then mapping an explicit result to an implicit model based on an analysis continuity technology, and simulating a workpiece stress release and natural cooling heat dissipation process so as to obtain the residual stress distribution of the machined surface. According to the method, the residual stress on the surface of the laser-assisted micro-milling nickel-based superalloy is effectively predicted, and the method has practical application value for improving the machining quality of parts and prolonging the service life of the parts.

The invention discloses an engineering structure topological optimization method and system for rapid solution under transient stress constraint, which takes the square of the average dynamic flexibility of the whole structure as a target function, and adopts a modal displacement method for quasi-static response compensation in order to solve the problem of huge calculated amount consumption of transient dynamic analysis. Stress control considering transient analysis is realized, and in order to control the calculation efficiency, transient stress after P-norm aggregation is adopted for constraint; and based on an adjoint method, deriving the sensitivity of a target function and the transient stress after P-norm aggregation, and solving an optimization problem by adopting an optimization algorithm based on a moving asymptote method. An optimization example shows that the method can effectively meet the stress constraint requirement while reducing the transient dynamics analysis calculation amount.

The application discloses a rapid design method and system of a turbine blade, an electronic device and a storage medium. The rapid design method is characterized in that: first, boundary conditions of a gas side and a cold gas side of the turbine blade under an actual working environment are respectively obtained based on flow heat exchange test data; then, a heat exchange boundary model is constructed based on the boundary conditions, so that temperature field calculation becomes a pure solid heat conduction problem, and only depends on known boundary conditions and material properties, so that the heat exchange boundary model can be directly applied to a three-dimensional model of the blade for transient temperature field calculation, replacing CFD simulation calculation which needs to be solved iteratively, and completely eliminating the most time-consuming flow field solving and flow-heat coupling iteration links in the whole analysis process, thereby ensuring calculation accuracy and significantly improving calculation efficiency. Moreover, through decoupling calculation of transient temperature field and transient stress field, the heat-force coupling chain is also cut off, further improving the calculation efficiency.

The invention discloses an automobile fastener optimization design method and system, and relates to the technical field of fastener design, and the method comprises the following steps: obtaining a real-time magnetic flux density distribution signal of a fastener in a stress operation process, extracting magnetic field direction gradient information by using a high-sensitivity vector magnetic sensing array, forming a stress magnetization dynamic evolution curve, and obtaining a stress magnetization dynamic evolution curve; establishing a continuous time sequence base line for residual magnetic field identification based on the curve; and according to the established continuous time sequence baseline, extracting a magnetic domain rotation rate abrupt change section in the stress magnetization dynamic evolution curve, constructing a residual magnetic field accumulation characteristic function, and separating a steady-state magnetic domain signal from transient stress response. By constructing a stress magnetization dynamic evolution curve and a time sequence base line, accurate correspondence between a magnetic signal and a stress state is realized, residual magnetic interference is separated, and magnetic response is kept stable; through multi-dimensional magnetic flux reconstruction and dynamic compensation, a magnetic signal only responds to real looseness, and the accuracy and operation reliability of fastener detection are remarkably improved.

The invention relates to a film hole detection system based on image recognition and a detection method thereof, and belongs to the technical field of intelligent manufacturing and laser processing process control, and the method comprises the following steps: S1, adopting a multi-mode sensing module to collect various physical signals of a processing area in real time so as to form a multi-dimensional data stream; s2, inputting the multi-dimensional data stream into a digital twinning and simulation module to solve total interface stress, and generating a three-dimensional transient stress field distribution diagram; s3, inputting the multi-dimensional data stream into a defect prediction and early warning module to generate a defect occurrence probability; s4, generating a graded early warning signal based on the defect occurrence probability and a preset graded early warning threshold value; s5, based on the total interface stress and the graded early warning signal, a pulse energy control law is adopted, and an adjusted pulse energy parameter is solved; and S6, the adjusted pulse energy parameters are input into a laser machining execution module to achieve closed-loop control over the laser machining process, and an unprecedented data basis is provided for deep analysis and accurate prediction.