7results about How to "The overall calculation is small" patented technology

The invention discloses a liquid-solid coupling transient calculation method and device for a liquid-filled rotor of a centrifugal machine. The method comprises the implementation steps that (1) dynamic characteristics of fluid in a rotary drum of the centrifugal machine under multiple working conditions, namely different liquid filling amounts and different rotating speeds are obtained; 2) inputting the characteristic point displacement, the liquid filling amount and the rotation speed obtained by simulation into a neural network for training, and constructing a neural network finite element dynamic model; and 3) through a neural network and finite element coupling method, carrying out finite element modeling on a linear part, describing a nonlinear part by using a neural network, coupling a finite element model part and a neural network part according to a boundary condition and a connection condition, and carrying out linear-nonlinear transient dynamic solution analysis on the coupled dynamic model. The method can solve the problems that the calculation speed is slow and time is consumed due to the fact that the freedom degree of the model is too high in a traditional finite element modeling method, and the non-linear dynamic characteristic representation of the liquid-carrying rotor system model is inaccurate.

The application discloses a steady-state approximate modeling method for thermal characteristics of a high-power pulse semiconductor laser. The method comprises the following steps: obtaining material parameters of each layer of a laser chip, and calculating heat diffusion time of heat in the chip layer; determining characteristic heat diffusion time required for the device to complete main heat diffusion through transient heat simulation of a single pulse period; determining an effective heat participation coefficient according to the heat diffusion time and the characteristic heat diffusion time; multiplying average heat power density of an active region of the high-power pulse semiconductor laser by the effective heat participation coefficient to obtain equivalent heat source density of the active region, and loading the equivalent heat source density into a steady-state heat analysis model for calculation. By introducing the effective heat participation coefficient based on the heat diffusion mechanism, the application corrects errors of a traditional average power model under high-frequency and short-pulse working conditions, realizes the consideration of calculation accuracy and efficiency, and can quickly and accurately predict active region temperature and thermal stress distribution of the pulse laser.

A wind speed identification method, device, equipment and medium based on spectrum data, including spectrum preprocessing of original spectrum data, forming an image matrix from spectrum data after spectrum preprocessing under each range gate, performing convolution processing on the image matrix to perform signal enhancement on spectrum data on each range gate, and obtaining an enhanced image matrix; segmenting wind spectrum data and background data in the enhanced image matrix to obtain a segmented image matrix; binarizing the segmented image matrix using different binarization thresholds, and determining a target binarized image matrix according to the area of ​​the connected area in each binarized image matrix; screening out target feature areas in the target binarized image matrix that meet the wind spectrum feature label, and performing wind spectrum solution on the spectrum data under the range gate whose distance in the weighted target feature area is greater than the first distance threshold, and obtaining the solved wind speed. The accuracy of wind speed identification is improved.

The present invention discloses a simulation optimization method and optimization system for active highway control strategy based on Bayesian theory, which specifically includes building a SUMO simulation environment simulating real traffic flow to dynamically simulate the active highway control strategy; establishing evaluation indicators for traffic network performance; constructing a two-layer programming model, wherein the upper model uses the evaluation index as the optimization target, the lower model uses the balanced traffic flow simulated by SUMO as the decision variable, and simulates the real traffic flow according to the optimization target of the upper model; and iterates and optimizes the decision variables in the two-layer programming model using the Bayesian optimization method to find the best decision variable combination, and the best optimization target can be obtained based on the best decision variable of the combination. The method described in the present invention is applicable to complex highway traffic scenes, and can ensure that the proposed active control strategy can improve the traffic efficiency of the road while ensuring traffic safety, and has low computing requirements.

A wind speed identification method, device and equipment based on frequency spectrum data and a medium, comprising: performing frequency spectrum preprocessing on original frequency spectrum data, forming an image matrix by the frequency spectrum data after frequency spectrum preprocessing under each range gate, performing convolution processing on the image matrix to perform signal enhancement on the frequency spectrum data on each range gate, obtaining an enhanced image matrix; segmenting the wind spectrum data and the background data in the enhanced image matrix to obtain a segmented image matrix; binarizing the segmented image matrixes by using different binarization thresholds, and determining a target binarized image matrix according to the area of a connected area in each binarized image matrix; and screening out a target feature region meeting the wind spectrum feature tag in the target binary image matrix, and carrying out wind spectrum calculation on spectrum data under a distance gate of which the distance is greater than a first distance threshold in the target feature region after weight increase to obtain a calculated wind speed. And the accuracy of wind speed identification is improved.

This invention discloses a method and system for recovering encrypted files based on key context. The method includes: acquiring the underlying binary image of the target storage medium; parsing the file system structure to locate the inode table; filtering encrypted file inodes whose status is deleted, and extracting key information including data block pointers, master key identifiers, and encryption policy descriptors; obtaining the master key from the associated system kernel based on the master key identifier, and calculating and generating a file content encryption key in combination with the encryption policy descriptor; decrypting the extracted encrypted data blocks using the key, and reassembling them in sequence to complete file recovery. This invention avoids the huge computational consumption of traditional brute-force attacks by directly utilizing residual metadata of the file system and the master key cached by the kernel for key reconstruction, and, based on the general FBE mechanism, does not rely on specific vulnerabilities, significantly improving the recovery efficiency and applicability for Android FBE encrypted files.

The invention provides a robot indoor and outdoor fixed-point inspection method based on a GNSS and a 2D laser radar, and relates to the technical field of positioning navigation. The method comprises the following steps that S1, indoor and outdoor environment information is collected, a map is established, key nodes are selected indoors and outdoors, and key node information is collected; s2, constructing a topological map; s3, the robot receives all the specified inspection sites transmitted by the client, plans an inspection route passing through all the specified inspection sites, and starts to operate; s4, the robot arrives at the first designated inspection site, obtains key node information, receives the next inspection site as a new target site, judges whether the new target site is indoor or outdoor, adjusts the robot positioning method and goes to the new target site until the robot passes through all the designated inspection sites in sequence; and S5, determining whether the robot inspects again or not according to requirements. According to the invention, the robot can be accurately positioned in different indoor and outdoor environments, and positioning and navigation methods can be timely and accurately switched according to the environment.