5 results about "Forward wave" patented technology

The application discloses a kind of plant fiber reinforced composite based on three-dimensional waveguide wave field's full complex stiffness matrix identification method and system, comprising: narrow-band waveguide excitation is applied to sample and three-dimensional velocity time-domain response signal is collected;Signal is converted to polar coordinate system and modal separation is carried out;Real wave number-frequency pair representing dispersion characteristics and imaginary wave number-frequency pair representing attenuation characteristics are extracted respectively;Based on material structure parameter, establish stiffness matrix method forward wave propagation model and calculate theoretical complex wave number;Two-stage optimization objective function of real and imaginary wave number joint constraint is constructed, and full complex stiffness matrix is obtained by mixed optimization algorithm inversion.This application realizes the decoupling of geometric diffusion and material dissipation by multi-modal three-dimensional wave signal processing and complex wave number separation extraction;Combined with efficient forward model and global-local mixed optimization strategy, the stability and precision of high-dimensional parameter inversion are improved, which can be used for nondestructive testing and viscoelastic parameter accurate identification of plant fiber reinforced composite.

This application relates to a method, system, terminal, and storage medium for suppressing coupled vibrations in ships, and pertains to the technical field of ship vibration reduction control. The method includes acquiring the shafting torsional vibration amplitude; determining whether the shafting torsional vibration amplitude exceeds a preset torsional vibration amplitude threshold; if not, continuously acquiring the shafting torsional vibration amplitude for cyclic judgment; if exceeding, acquiring the main engine output torque and shafting output torque; determining whether the main engine output torque and shafting output torque meet preset coupled vibration result requirements; if not, continuously acquiring the main engine output torque and shafting output torque for cyclic judgment; if meeting, acquiring historical intervention data and forward wave data; analyzing the historical intervention data and forward wave data, and controlling a preset dynamic torque output from the motor to suppress the coupled vibration between the preset ship main engine and the preset shaft drive system. This application improves the effectiveness and accuracy of ship coupling suppression.

The application provides a processing method for western system airborne friend-or-foe identification, comprising the following steps: developing laboratory test on OBA table of each sub-wave position in N main-wave position and M sub-wave position set and obtaining; carrying out autonomous scanning or traction inquiry according to working mode instruction, putting forward wave beam dispatch optimization according to demand, carrying out plot condensation according to response data obtained by inquiry, and obtaining initial plot; carrying out same sector preprocessing and different sector preprocessing on the initial plot; designing adaptive correlation threshold, taking each mode clear code as target friend-or-foe identification task processing criterion, carrying out correlation matching according to the adaptive correlation threshold, simultaneously introducing multi-target cluster similar identification, and obtaining target friend-or-foe identification attribute; maintaining and reporting once radar traction target set. The application can effectively improve the azimuth detection precision of the target, better avoid mis-correlation phenomenon when the number of targets in the same area is relatively large, and greatly improve the friend-or-foe identification success rate.

This invention relates to the field of ship adjustment technology and discloses a navigation planning and control method for an autonomous sightseeing boat based on ADRC. The method includes: acquiring the sightseeing boat's pose feedback and forward wave disturbance data; mapping the disturbance data to feature sampling points and fitting them to generate a spatiotemporal evolution envelope of the disturbance; determining a gradient gain factor based on the principal curvature of the evolution envelope at the forecast point; using the gradient gain factor to set the observation bandwidth of the extended state observer and estimating the lumped disturbance amount including environmental interference and unmodeled dynamics; generating an initial adjustment amount based on the path deviation and outputting a thrust command in conjunction with the lumped disturbance amount. This invention utilizes differential geometric features to actively adjust the observation bandwidth, transforming disturbance perception from a delayed response to an early prediction, effectively suppressing the divergence of observation logic caused by the physical limitations of the power system, and ensuring the fidelity of path tracking in complex waters.

This invention discloses a method for measuring the reflection coefficient of an internal electromagnetic field. Based on field values ​​measured at three equally spaced points, this method extracts the field values ​​of the forward and backward waves from the total electromagnetic wave, including both forward and backward waves, using the field values ​​of these three points within a one-dimensional uniform or periodic structure. The reflection coefficient within the structure is then obtained accordingly. This method is simple, fast, and accurate, and can be used in the design of transmission lines and antennas. It can be applied to both uniform and periodic structures; both closed transmission line structures such as waveguides and open transmission lines such as microstrip lines; both waveguide structures of transmission lines and radiating structures of antennas; and both lossless and lossy structures.