4 results about "Projection algorithms" patented technology

This application provides a data-driven multivariable adaptive predictive control method for an adaptive cyclic engine, belonging to the field of aero-engine technology. The method includes: constructing an equivalent data model of the adaptive cyclic engine based on full-format dynamic linearization of the engine's input and output data to obtain multi-step forward output prediction equations; performing real-time estimation of the pseudo-gradient matrix in the prediction equations using autoregressive and projection algorithms to form a predictive control rolling optimization framework; embedding a model-free adaptive control algorithm based on single-step optimization into this framework to form a composite control strategy; designing control input performance indicators with the goal of minimizing tracking error to obtain optimal control parameters; and generating real-time optimal control parameters using the engine's real-time input and output data based on the composite control strategy to achieve precise multivariable coordinated control. This application improves the long-term prediction, constraint handling, and global optimization capabilities of the control system.

The invention discloses a three-dimensional Gaussian modeling method for analyzing biomacromolecule components and conformation heterogeneity, and belongs to the technical field of cryoelectron microscope image processing. According to the method, the component and conformation heterogeneity can be directly represented through the change of Gaussian parameters, and an intuitive and explainable structure change description is provided; the consistency and integrity of the local structure along the transformation trajectory are ensured through geometric constraint; modeling of tens of thousands of Gaussian models on a pseudo-atom level is supported; gaussian variation is converted into an atomic conformation landscape through natural support, and a direct bridge is provided between density-based analysis and pseudo-atom level interpretation; the method is realized through an efficient Gaussian projection algorithm and parallel computing, and the processing capacity of a large-scale data set is remarkably improved. According to the method, the component and conformation heterogeneity can be effectively processed at the same time, the continuous conformation change is visually represented, the local structure consistency is kept, the density model and the atomic model are naturally connected, and the defects in the prior art are overcome.

The invention belongs to the technical field of three-dimensional radar imaging, and discloses a target defect detection method based on vortex electromagnetic waves, which comprises the following steps: step 1, generating vortex electromagnetic waves by using a UCA; for the uniform circular array, vortex electromagnetic waves are generated by adopting an incremental phase modulation excitation method; step 2, background cancellation; and step 3, providing an improved OAM-BP algorithm in combination with vortex electromagnetic waves and a backward projection algorithm. The method integrates the advantages of a plane scanning technology, vortex electromagnetic wave characteristics and a backward projection algorithm. Through precise control of a plane scanning path, vortex electromagnetic waves are used as a detection carrier, and high-sensitivity detection of internal defects of the material is realized. And the collected scattering signals are processed by adopting a backward projection algorithm, so that high-resolution reconstruction of defect images is realized. Theoretical analysis and numerical calculation both verify that the method improves the detection resolution.

The invention discloses a gesture point selection and distance measurement method in a three-dimensional point cloud perspective display mode, and the method comprises the steps: obtaining a two-dimensional coordinate of a user gesture through a touch screen of an intelligent mobile device, mapping the two-dimensional coordinate into a ray end point in a three-dimensional space coordinate system through normalization conversion and inverse matrix operation, and obtaining a ray end point in a three-dimensional space coordinate system; the method comprises the following steps of: acquiring a ray, converting the ray into an actual three-dimensional coordinate, converting three-dimensional point cloud data from a Cartesian coordinate system into a cylindrical coordinate system, judging whether the ray is intersected with a cylinder or not through a ray equation, screening intersection points meeting conditions, calculating the shortest distance between the ray and the central axis of the cylinder, and determining whether a target point is selected or not through a distance threshold value. According to the method, misoperation is effectively avoided through minimum distance judgment and screening, the interaction experience of a user is improved, the method is suitable for multiple application scenes such as augmented reality and virtual reality, coordinate conversion and ray projection algorithms are optimized, and the response speed and accuracy of the system are improved.