Acquirement method of tool nose point modal parameters relative to speed in principal shaft dry running stimulation

Abstract

The invention discloses an acquirement method of tool nose point modal parameters. According to the fact that repeated acceleration and deceleration impact is exerted in rotation of principal shaft dry running of a numerically-controlled machine tool, the tool nose point modal parameters on a principal shaft are obtained. The method specifically comprises the steps that time and an accelerated speed value of single acceleration and deceleration impact exerted in rotation of principal shaft dry running are confirmed; partition time of adjacent acceleration and deceleration impact exerted in rotation of principal shaft dry running is confirmed, wherein the sequence of the partition time is a random sequence; rotation of principal shaft dry running is controlled according to the confirmed accelerated speed, the time of the single acceleration and deceleration impact and the partition time of the adjacent acceleration and deceleration impact, and therefore stimulation is produced; the tool nose point modal parameters can be acquired after response signals of a principal shaft tool nose point are collected, analyzed and processed in stimulation. According to the method, the modal parameters relative to speed in rotation of principal shaft dry running can be acquired, and the modal parameters of actual working conditions can be acquired more accurately.

Description

technical field [0001] The invention belongs to the field of numerical control equipment structural modal parameter analysis, and in particular relates to a method for acquiring the modal parameter of a tool tip point on a main shaft of the numerical control equipment. Background technique [0002] Traditional experimental modal analysis techniques can obtain complete modal parameters, including natural frequencies, damping ratios, and mode shape vectors. The traditional experimental modal analysis technology needs to use excitation signals in the analysis process, and the corresponding complex excitation equipment is required in the experiment process, and it is carried out in a static state of the structure. A large number of studies and experiments have proved that the modal parameters of the machine tool structure in the static state and the working state are not consistent. In the field of machine tool structure dynamics research, people pay more attention to the dynami...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for acquiring the modal parameters of the tool tip point. Perform excitation to obtain the modal parameters of the tool tip point of the spindle at a certain speed or in a static state, thereby solving the technical problem that the modal parameters under actual working conditions cannot be accurately obtained

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