5 results about "Random waves" patented technology

The application discloses a fundamental wave extraction method under frequency offset based on a linear neural network, and has the advantages of high extraction accuracy, adaptability to frequency disturbance and the like. A traditional digital band-pass filter cannot change its center frequency after design, when the frequency and amplitude of an input signal are offset, the output signal of the traditional digital filter will be phase-shifted and attenuated to different degrees in amplitude, and even waveform distortion will occur, so the traditional digital band-pass filter needs to be redesigned, which is complicated and greatly increases the design cost. The band-pass digital filter against frequency offset based on the adaptive linear neural network can adaptively filter according to the frequency and amplitude changes of the input signal, and thus has strong robustness for frequency-amplitude random fluctuation signal detection, and can be applied to fundamental wave signal extraction of power grid voltage / current and the like.

The application discloses a kind of ocean ranching platform based on post-bending pipe and oscillating float type wave energy generation system, including ocean ranching platform, post-bending pipe type power generation device, oscillating float type power generation device;Post-bending pipe is driven by the air movement of water column oscillation and drives turbine and generator to rotate and output electric energy;Oscillating float type power generation device can capture multiple direction vibration energy to generate electric energy.Application, when ocean ranching platform is moved by random wave load, two wave energy generation devices can generate power simultaneously, improve the utilization efficiency of wave energy.This scheme oscillating float type power generation device can be used as the cabin ballast of post-bending pipe type power generation device, realize ocean ranching platform to reduce roll while generating electricity;This scheme can also prevent key components from being eroded and damaged by seawater during power generation, thereby improving the service life of the device, and realizing continuous and stable power supply to the aquaculture equipment carried by the ocean ranching platform, effectively solving the long-term self-power problem of the existing ocean ranching platform.

This invention discloses a simulation method and system for ship berthing and unberthing maneuvering considering the combined effects of wind and waves. The method establishes a body-dependent coordinate system with the ship's center of gravity as the origin, constructs three-degree-of-freedom motion equations for the ship's sway, roll, and bow roll in the horizontal plane, and couples the ship's hydrodynamic forces, propeller forces, rudder forces, bow thruster forces, wind loads, current loads, and wave drift forces into the state model. Wind loads are calculated using the wind pressure coefficient method, current loads using the current pressure coefficient method, and wave drift forces are obtained through frequency domain integration of the random wave spectrum and the drift force transfer function. Based on the aforementioned maneuvering forces and environmental forces, the state vector is solved iteratively using the fourth-order Runge-Kutta method, updating the ship's position coordinates, heading angle, and velocities in each direction in real time, and outputting the time histories of environmental forces and maneuvering forces to support berthing and unberthing maneuvering decisions. This invention features complete environmental load modeling, high numerical solution accuracy, and a modular system structure, demonstrating good engineering applicability.

An apparatus includes at least one processor; and at least one memory storing instructions that, when executed using the at least one processor, cause the apparatus to: receive the activation signal including seed information, wherein the seed information is common to seed information in a reader; generate a signal based on at least one predetermined instruction and the seed information from the received activation signal; and transmit the generated signal from the apparatus.

This invention discloses a method and system for simulating stationary non-Gaussian wind fields based on random waves, relating to the field of non-Gaussian wind field simulation in structural wind engineering. It includes: acquiring the autopower spectrum and coherence function of the target wind speed field to construct the target non-Gaussian wavenumber-frequency spectrum; discretizing the wavenumber and frequency, and generating a bottom-level stationary Gaussian random field by combining random wave spectrum representation and two-dimensional fast Fourier transform; reconstructing the target non-Gaussian marginal probability density function and cumulative distribution function based on finite-order statistical moments using the maximum entropy method; embedding a piecewise Hermite polynomial model to construct a piecewise translation mapping function from Gaussian to non-Gaussian; inversely calculating the bottom-level Gaussian correlation structure and determining its spectral characteristics based on the correlation distortion relationship; and applying the piecewise translation mapping function to obtain stationary non-Gaussian wind field samples. This invention eliminates the need to decompose high-dimensional matrices, balancing computational efficiency and numerical stability, characterizing the high-order statistical properties and tail probabilities of strong non-Gaussian wind fields, and ensuring the spatiotemporal correlation of the wind field.