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The application discloses a method for matching selection of a ship body, a main engine and a propeller, and comprises the following steps: step 1, setting ship parameters, design requirements and propeller parameters; step 2, constructing a propeller hydrodynamic performance prediction model based on a support vector machine, wherein the input of the model is the propeller parameters, and the output of the model is the open water power of the propeller; step 3, constructing a four-stage matching method, and optimizing a disc area ratio in each stage; step 4, performing cavity checking and strength checking on the matching results output in step 3, and taking the matching results meeting the checking as effective propellers; and step 5, sorting the effective propellers by a double optimization target method, and taking the optimal effective propeller as the final matching result. The application can quickly provide the matching selection result of the ship body, the main engine and the propeller, can comprehensively design the main engine and the propeller parameters, and ensures that the open water efficiency of the propeller reaches the optimum, and reduces the labor cost in the design process.

This invention discloses a method and system for optimizing gift design schemes by integrating multimodal user demand perception, relating to the field of data processing technology. The method includes: acquiring a set of gift size demand features; calculating the weight coefficients of each gift size demand feature through sensitivity analysis combined with historical gift design schemes; constructing a collaborative optimization objective function for gift size, using size design parameters as independent variables and maximizing the overall matching degree as the optimization objective, while setting cost constraint thresholds and material size matching thresholds as optimization constraints; acquiring the gift size design range, iteratively solving the collaborative optimization objective function to obtain multiple candidate size design schemes that satisfy all constraints, and the overall matching degree corresponding to each candidate scheme; selecting the candidate size design scheme with the highest overall matching degree and single-dimensional matching degree to obtain the optimal gift size design scheme set. This invention effectively improves the overall matching degree of gift size design under multimodal user demand.