工程 Resources

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Time series forecasting holds significant importance in economics and engineering fields. This study leverages the characteristics of dynamic neural networks to propose a time series prediction methodology, implementing a designed dynamic network to forecast response time series of Duffing's equation. Results demonstrate that dynamic neural networks effectively predict response time series of dynamic systems, with MATLAB implementation utilizing NARX (Nonlinear Autoregressive with Exogenous Input) network architecture and time-delay feedback mechanisms.

MATLAB 273 views Tagged
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The PCA (Principal Component Analysis) algorithm is widely applied in engineering and scientific research. This report investigates its fundamental structure and working principles. Conventional PCA primarily employs linear algorithms, but research reveals limitations such as inability to separate independent signal components from linear combinations, with principal components determined solely by second-order statistics (autocorrelation matrices) that only describe stationary Gaussian distributions. Improved versions include nonlinear PCA and robust algorithms. We demonstrate engineering applications through a line/plane fitting example using minor components (variance-minimizing elements) from component analysis.

MATLAB 231 views Tagged
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Development of a universal engineering model for photovoltaic cells. Presents an algorithm for maximum power point tracking (MPPT) using perturb and observe method through Boost converter duty cycle control, with simulation verification. First establishes a generic PV model in MATLAB/Simulink environment that can simulate various photovoltaic cell types and specifications. Implements MPPT control to ensure optimal power output by dynamically adjusting operating parameters based on real-time power measurements.

MATLAB 250 views Tagged
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