Experimental modal analysis method of numerical control equipment

Abstract

The invention discloses an experimental modal analysis method of numerical control equipment, which belongs to the technical field of the performance parameter analysis of the numerical control equipment; the method comprises the following steps of: carrying out self-excitation input and generating broadband excitation to the structure of the numerical control equipment by self excitation; based on the analysis of the sensitive point of the excitation response of each component of the numerical control equipment, optimizing the arrangement of test points; picking up the excitation response signal data of each arrangement test point; collecting the excitation response signal data; analyzing and reprocessing the collected data; and based on a peak value method, processing the excitation response signal data of a reference point and each response point to obtain the dynamic property parameters of the structure of the numerical control equipment. The invention breaks through the defect that the traditional experimental modal analysis technology needs to additionally add excitation input and carry out various forced assumptions on the excitation input, and the experimental cost can be greatly lowered because external excitation is not needed.

Description

Technical field: [0001] The invention belongs to the technical field of performance parameter analysis of numerical control equipment, and in particular relates to an experimental modal analysis method of numerical control equipment. Background technique: [0002] At home and abroad, the theory and method of experimental modal analysis have been used to systematically study the dynamic characteristics of mechanical structures, and relatively mature analytical instruments and commercial software have been formed. The traditional modal parameter identification system is based on the test and analysis of the transfer function for parameter identification, that is, each excitation and response signal of the system is measured at the same time, and the FFT operation is performed to obtain the transfer function matrix. Curve fitting of nanofunctions to identify the modal parameters of the structure. This traditional experimental modal analysis system has been widely used in the i...

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Problems solved by technology

If the harmonic frequency is close to the natural frequency of the structure, the above-mentioned modal analysis method will not be able to accurately identify the modal parameters, and in the actual work excitation of CNC equipment, the harmonic interference introduced by the rotating parts will also be time-varying, which is even more important. increases the difficulty of analysis

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