Method for executing layout optimization on model analysis measurable nodes of numerical control machining equipment

Abstract

The invention discloses a method for executing layout optimization on experimental model analysis measurable nodes of numerical control machining equipment, which comprises the following steps: (1) obtaining the overall structure modal shape of the equipment and a corresponding modal shape matrix through finite element simulation; (2) determining and selecting a modal shape sensitive component of the equipment and a corresponding shape matrix by utilizing the overall structure modal shape; (3) selecting surface measurable nodes from the modal shape sensitive component, wherein the surface measurable nodes are used as objects to be optimized in layout; (4) performing iteration elimination on the surface measurable nodes by using an effective independence method; and (5) executing linear even node distribution on the modal shape sensitive component by adopting the Shannon's sampling theorem. Through the method for executing the layout optimization on the experimental model analysis measurable nodes of the numerical control machining equipment, the defects in the aspects that the traditional modal testing efficiency is low, the time is long and the like can be overcome, and the number of the measurable nodes and the positions of the measurable nodes can be optimized, and the testing efficiency can be increased on the premise of ensuring natural frequency and shape identification in numerical control machine structure modal testing.

Description

technical field [0001] The invention belongs to the field of structural modal testing of numerically controlled machining equipment, and in particular relates to a method for performing layout optimization on experimental modal measuring points of numerically controlled machining equipment. Background technique [0002] In recent years, measurement point optimization has attracted more and more attention. Measuring point selection is the basic problem of response signal picking in modal test analysis. In the modal experiment test of CNC machine tools, the selection of measuring points plays an important role in the structural modal identification. The so-called experimental modal analysis method is to implement artificial excitation through hammer, exciter or excitation table, and analyze the modal properties of the structure by measuring the input and output signals, so as to provide a reference for structural optimization and structural condition analysis. With the conti...

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Problems solved by technology

However, the measuring points obtained by the effective independent method cannot meet the requirements of identifying the mode shape, so the arrangement optimization of the measuring points cannot be fully and effectively realized in terms of the number of measuring points and the location of the measuring points

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