4 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.