4 results about "Nonlinear perturbations" patented technology

The present application belongs to the technical field of power system, and particularly relates to a time-delay power system stability analysis method and system. The method firstly establishes a load frequency control system model including time delay and nonlinear load disturbance, wherein the nonlinear load disturbance is a nonlinear disturbance taking unknown exogenous load disturbance as current and delayed state variable; then an augmented Lyapunov-Krasovskii functional is constructed, and an analysis method based on time-delay dependent matrix free matrix integral inequality and anti-convex combination inequality is adopted to analyze the stability of the load frequency control system, so as to obtain the stability criterion of the load frequency control system. The present application plays an important role in improving the calculation accuracy and time delay upper limit, and is helpful to expand the stable operation area of the power system.

This invention discloses a smart parcel locker location selection method based on IF-WSP. It utilizes interval fuzzy numbers to establish a fuzzy evaluation matrix, defines random floating parameters, and uses these parameters to weight and integrate expert opinions. An improved chaotic mapping function based on nonlinear perturbation is employed. The method calculates cumulative and summative location selection schemes based on evaluation standard weights, generates a chaotic threshold using the nonlinear perturbation chaotic mapping function, and uses this threshold to perform multiple synthesis of the cumulative and summative location selection schemes. The average location score is then used for defuzzification to determine the final location result. Compared with existing technologies, this invention uses fuzzy logic to transform expert opinions into mathematical expressions and combines them with weighted aggregation and multiplication, fully considering the satisfaction of different customers. This results in parcel locker locations that are closer to customer needs, improving the performance of the parcel lockers and demonstrating significant social value and market application prospects.

An ultrasonic ranging calibration method and apparatus based on a multi-parameter coupled compensation sensing network is disclosed. The method includes: first, constructing an ultrasonic ranging system to accurately acquire and transmit basic time parameters and multi-dimensional perturbation parameters; second, constructing a multi-parameter coupled compensation sensing network for distance calibration, fusing multiple parameters through a nonlinear perturbation injection function to construct an input vector, and using a hierarchical coupling compensation method to achieve step-by-step error correction, outputting a compensation amount or compensation factor based on the basic ranging result to complete distance correction; subsequently, collecting sample data under multiple perturbation parameter combinations and multiple reflection conditions, preprocessing the data, dividing it into training and test sets, and using an error constraint strategy based on the predicted deviation distribution for closed-loop training optimization to improve the model's generalization ability; finally, deploying the trained model to the main control processing unit to achieve real-time dynamic compensation ranging. This invention effectively overcomes the accuracy limitations of traditional ultrasonic ranging technology in complex environmental perturbations and multi-reflection characteristic adaptation scenarios, significantly improving ranging accuracy and scenario adaptability, and promoting the application expansion of ultrasonic ranging technology in complex scenarios such as industry, intelligent robots, and autonomous driving.

This invention relates to a precipitation time-downscaling forecasting method based on the smoothed weighted allocation method, belonging to the field of meteorological precipitation forecasting technology. This invention addresses the key issue of refined quantitative precipitation forecasting in meteorological services and disaster prevention and mitigation decision-making. It achieves time-downscaling of precipitation at the hourly scale by sequentially averaging, smoothing, and weighting the model's 3-hour cumulative precipitation forecast using the ASW (Averaged-Smoothen-Weighted) method. During this process, a weighted allocation coefficient for time-downscaling is constructed and applied to the hourly precipitation sequence calculation. This adds a nonlinear perturbation term to the temporal variation of precipitation, making the downscaling process closer to the actual physical changes, while ensuring that the model's 3-hour cumulative precipitation remains unchanged before and after downscaling. This method can achieve hourly precipitation forecasts over 120 hours, improving the time resolution of model precipitation forecasts and is suitable for regional or single-station refined precipitation forecasting.