Multi-objective optimization method for eight-link mechanical press based on nsga-ii algorithm

Abstract

The invention provides a multi-objective optimization method for an eight-link mechanical press based on the NSGA-II algorithm, including determining the optimization target, design variables and constraints, and establishing a mathematical model; simplifying the eight-link mechanism model; and setting the initial design variables and the initial eccentric body speed, the kinematic analysis of the eight-bar linkage mechanism model is carried out to obtain the kinematic parameters including the slider stroke, slider speed and slider acceleration; according to the kinematic parameters and the tonnage information of the press, the eight-bar linkage mechanism Perform dynamic analysis on the model to obtain the crank torque; use the NSGA-II algorithm to optimize the slider speed fluctuation and the maximum crank torque, solve the multi-objective optimization mathematical model, and obtain the Pareto optimal solution set of the design variables and other steps. The design variable obtained by the invention has high accuracy rate and fast optimization, which reduces the design and development time of the enterprise.

Description

technical field [0001] The invention relates to the field of mechanical transmission, more specifically, it relates to a multi-objective optimization method for an eight-link mechanical press based on the NSGA-II algorithm. Background technique [0002] Mechanical press is a typical mechanical product with many varieties and small batches. It is generally designed on the basis of the whole machine. With the development of the automobile industry and the renewal of old stamping equipment, the current product structure is divided by the original standard machine. 60%, 40% of customized machines, and gradually develop to 60% to 70% of customized machines. This is undoubtedly a huge technical challenge. Moreover, the mechanical press is made to order, and each press needs to be redesigned according to the customer's order requirements. Sometimes a production line needs to design 3 to 5 machines at the same time, and the conventional design of each machine generally needs to go t...

AI Technical Summary

Problems solved by technology

In addition, mechanical presses are made to order, and each press needs to be redesigned according to the customer's order requirements. Sometimes a production line needs to design 3 to 5 machines at the same time, and the conventional design of each machine generally needs to go through data retrieval, A series of iterative processes such as scheme conception, calculation and analysis, drawing and document preparation involve many contents and steps, a large amount of formulas, charts and data, and many mutual constraints, which require a lot of manpower. Therefore, the design cycle is long and the tasks are heavy.

[0003] However, some orders can be realized only by fine-tuning the design parameters on the basis of mature models, while the conventional manual modification of the model is not only error-prone, but also takes a lot of time, greatly increasing the design and development cycle of the enterprise

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