6results about How to "Accurate and efficient calculation" patented technology

A computer vision-based method for calculating the volume of stacked goods within a regular cube space is disclosed. This method trains a neural network for semantic segmentation using the projected images of the stacked goods on both sides of the cube to obtain a model for calculating the projected area of ​​the stacked goods. This model is then used to calculate the projected area of ​​the collected image data to determine the volume of the stacked goods within the regular cube space. This method avoids the problems of human error and subjective judgment inherent in traditional manual observation methods, and also avoids the drawbacks of instrument measurement methods, such as high equipment costs and maintenance expenses, and susceptibility to environmental interference. It enables accurate and efficient real-time calculation of the volume of stacked goods within a regular cube space.

This invention provides a method for predicting the pressure distribution of a shale gas horizontal well in a gas-liquid two-phase flow wellbore, belonging to the field of oil and gas field development. The method includes: dividing the target shale gas horizontal well into target well sections; performing a detailed simulation of the target well sections to obtain detailed simulation results; determining the functional relationship between the gas-liquid two-phase slip velocity and the average transport rate of the water phase in the target well based on the detailed simulation results of the target well sections; determining the functional relationship between the resistance coefficient and the outlet liquid holdup of the target well based on the detailed simulation results of each target well section; establishing a wellbore control coupling model for the target well based on conservation theorems, the functional relationship between the gas-liquid two-phase slip velocity and the average transport rate of the water phase, and the functional relationship between the resistance coefficient and the outlet liquid holdup; iteratively solving the wellbore control coupling model for the target well; and obtaining the pressure distribution of the shale gas horizontal well based on the iteration results to achieve accurate and efficient pressure distribution prediction.

The application discloses a kind of cylindrical detector angle measurement method, comprising the following steps: setting the projection plane of cylindrical detector;Based on the single frame result obtained by actual measurement of cylindrical detector to radioactive source, all angles are traversed, and the assumed incident part and the assumed exit part are projected to the projection plane in a one-to-one manner to obtain the first projection point and the second projection point;The first projection point and the second projection point are made to correspond to each other by interpolation;The first projection point and the second projection point are multiplied and summed to obtain the inner product result;Based on Cauchy inequality, the angle with the maximum inner product is selected as the correct incident angle.The application utilizes the property of mathematical Cauchy inequality to accurately and efficiently calculate the incident angle, eliminating the trouble of estimating the attenuation factor in the traditional method and the error introduced thereby.

This invention discloses a method for optimizing the thermal layout of satellite cabin components considering thermal radiation, belonging to the field of component layout optimization technology. The method includes: geometrically describing the components based on level set functions; constructing an interference model between components using Heaviside functions; estimating the global heat transfer matrix of satellite cabin radiation heat transfer in the space environment; dividing the satellite cabin layout area into finite element meshes; determining the global thermal load vector based on the component's heat source intensity distribution function using Heaviside functions and density projection methods; establishing the mapping relationship between component position parameters and the satellite cabin layout temperature field; constructing a satellite cabin thermal layout optimization model; and applying a gradient optimization algorithm to solve the satellite cabin thermal layout optimization model to obtain the optimal component layout scheme. The method of this invention avoids nonlinear iterative solutions, reduces the computational load, and obtains the optimal component layout scheme considering thermal radiation.

This invention discloses a virtual item recommendation method, a recommendation model training method, an apparatus, and a device. The method includes the following steps: constructing a virtual item vector sequence and a target object vector; obtaining a first behavior sequence and a second behavior sequence of the target object; determining a first interest vector using an LSTM model and a multi-head self-attention mechanism based on the virtual item vector sequence and the first behavior sequence; determining a second interest vector using an attention mechanism based on the virtual item vector sequence, the target object vector, and the second behavior sequence; fusing the first interest vector and the second interest vector to obtain a target interest vector; and determining virtual item recommendation information based on the matching degree between the target interest vector and each virtual item vector in the virtual item vector sequence. This method can improve the accuracy of virtual item recommendations and further enhance the recommendation experience for target objects, ultimately increasing the commercial value of products. It can be widely applied in the field of computer technology.

The application discloses a processing method suitable for large marine propellers and relates to the technical field of precise composite processing of large marine propellers, and comprises the following steps: installing a propeller and a standard ball on a rotating table of a machine tool, installing a high-precision calibration needle on a main shaft, establishing a positioning datum of a workpiece by using a fitting algorithm, constructing a workpiece coordinate system and a conversion relationship between the workpiece coordinate system and a machine tool coordinate system; acquiring point cloud data of each part of the propeller, and converting the point cloud data to the workpiece coordinate system by using coordinate conversion; performing coarse and fine splicing on blade root point cloud, combining data of the rest parts, and forming workpiece coordinate system point cloud data of the propeller; calculating polishing amount by using a normal projection algorithm based on the data; generating a machining track containing blade thickness calibration according to the polishing amount, and milling and polishing the propeller according to the machining track. The method significantly improves positioning accuracy, effectively eliminates clamping errors, is high in polishing amount calculation precision and efficiency and strong in self-adaptability, and significantly improves machining efficiency and shortens a production cycle.