Method and system for improving evaluation precision of incomplete small arc, medium and equipment

Abstract

The invention relates to a method and system for improving the evaluation precision of an incomplete small arc, a medium and equipment. The method comprises the following steps: determining a first optimal smoothing coefficient of a pre-established cubic exponential smoothing prediction model; further determining other optimal smoothing coefficients; fitting the optimal smooth coefficient to obtain a change trend curve of the smooth coefficient, and obtaining the smooth coefficient of the prediction period outside the data point set according to a fitting formula; calculating and predicting data points outside the actual measurement data point set by utilizing the smoothness coefficient of the prediction period number outside the data point set; judging whether a preset prediction period number is reached or not, and if so, reversing the sequence of the data point set; combining the original actual measurement data point set and the prediction data point set to form a new data point set, and performing curvature parameter evaluation on the new data point set by using an evaluation method so that the incomplete small arc evaluation precision can be enhanced. According to the method and system, the accuracy of curvature radius parameter evaluation can be improved, and the stability and accuracy of incomplete small arc curvature radius parameter evaluation are effectively improved.

Description

technical field [0001] The invention relates to the technical field of performance detection of mechanical components, in particular to a method, system, medium and equipment for improving the evaluation accuracy of incomplete small arcs. Background technique [0002] The incomplete small arc refers to the arc line or arc surface whose central angle corresponding to the arc profile is less than 120° and the radius of curvature ranges from 0 to 25 mm. The incomplete small arc profile is widely used in the national defense technology industry and precision manufacturing because of its special properties: for example, the front and rear edge profiles of aeroengine blades have a direct impact on the aerodynamic performance of the engine and the fatigue performance of the blades; CNC machine tools The tool tip directly determines its machining accuracy; the edge chamfering of some precision parts is used to remove processing burrs and improve the stress concentration of parts. T...

AI Technical Summary

Problems solved by technology

For example, the two-way prediction method based on the radial basis function neural network (RBFNN) requires a huge amount of arc contour data samples, and the amount of arc data samples available for training and learning in actual engineering is basically difficult to meet the requirements, and the universality of the application not tall

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