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Acquisition Method of Frequency Response Function of CNC Machine Tool Based on Different Structural States of Machine Tool

A technology of structural state and frequency response function, applied in the direction of digital control, electrical program control, etc., can solve the problems of occupying the working time of the machine tool, time-consuming and labor-intensive, and achieve the effect of saving cost and time

Active Publication Date: 2017-01-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, in the working modal analysis, after obtaining the natural frequency, damping ratio and uncalibrated mode shape, the input force must be measured to obtain the frequency response function of the machine tool’s structural state, and the measurement of the input force requires a large amount of time on the machine tool. working hours, laborious

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  • Acquisition Method of Frequency Response Function of CNC Machine Tool Based on Different Structural States of Machine Tool
  • Acquisition Method of Frequency Response Function of CNC Machine Tool Based on Different Structural States of Machine Tool
  • Acquisition Method of Frequency Response Function of CNC Machine Tool Based on Different Structural States of Machine Tool

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[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the invention.

[0035] In this embodiment, the method of the present invention is described by taking the XHK5140 vertical machining center as an example. The method for obtaining the frequency response function of a CNC machine tool based on different structural states of the machine tool includes the following steps:

[0036] (1) Figure 1 is a schematic diagram of the positions of the fixed parts and movable parts of the XHK5140 vertical machining center. Divide the whole machine tool into fixed parts and movable parts, including fixed parts composed of bed and column and movable parts composed of mach...

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Abstract

The invention provides a numerical-control machine tool frequency-response function obtaining method based on different structure states of a machine tool. The method comprises the steps that (1) the whole machine tool is divided into two parts, namely a fixed part and a movable part; (2) the modal parameter of the structure state of the machine tool when the movable part is in a first position is obtained; (3) the modal parameter of the structure state of the machine tool when the movable part is in a second position is obtained; (4) a modal calibration factor is worked out by using the modal parameters of the different structure states firstly, and then the frequency-response function of the machine tool in the structure states is synthesized by combining a modal expression of the frequency-response function. By means of the method, the frequency-response function can be obtained without measuring input force, and the dynamic characteristic of the machine tool can be monitored in real time.

Description

technical field [0001] The invention belongs to the field of dynamic analysis of the structural state of numerical control equipment, and in particular relates to a method for obtaining frequency response functions of numerical control machine tools based on different structural states of the machine tool. Background technique [0002] The frequency response function is the frequency response function, which is the quotient obtained by dividing the cross power spectrum function by the self power spectrum function. The frequency response function is a complex function, which is the description of the dynamic characteristics of the system under test in the frequency domain, that is, the description of the transfer characteristics of the input signal in the frequency domain by the system under test itself. In CNC machine tools, frequency response functions are used to characterize the dynamic characteristics of the machine tool's structural state, and the dynamic characteristic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/18
Inventor 李斌毛新勇罗博闫睿智蔡辉张译寒刘响求潘大为彭芳瑜
Owner HUAZHONG UNIV OF SCI & TECH
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