Method of correction on amplitude attenuation and phase delay of fast tool servo system
A servo system and phase delay technology, which is applied to the correction field of amplitude attenuation and phase delay in fast tool servo system, can solve problems such as low working frequency, and achieve the effect of simple solution process and accurate and reliable correction results.
Inactive Publication Date: 2013-05-22
NAT UNIV OF DEFENSE TECH
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[0008] 4. Based on the linear phase delay method to process sinusoidal shape parts, the linear phase delay generated by the fast tool servo system is only delayed by a fixed time in phase compared with the input sinusoidal signal, and has no effect on the processed surface shape; but it The working frequency is relatively low, it is necessary to reasonably match the motion quality and circuit time constant, and the amplitude attenuation should be compensated
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[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0044] Such as Figure 11 As shown, the correction method of amplitude attenuation and phase delay of the fast tool servo system of the present invention, the specific process is:
[0045] 1. Obtain the transfer function of the fast tool servo system through mathematical modeling and frequency sweep test;
[0046] see image 3 and Figure 4 , the fast tool servo system is an electromechanical coupling system consisting of a mechanical part and a circuit part ( Figure 4 The left side is the circuit part, and the right side is the mechanical part). Among them, the piezoelectric ceramic driver 1 is equivalent to a capacitor in the circuit part. Under the action of high-voltage driving voltage, the dimension of the piezoelectric ceramic driver 1 along the axial direction will be elongated in real time, and the elongation is approxima...
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The invention discloses a method of correction on amplitude attenuation and phase delay of a fast tool servo system. The method includes the steps of firstly, acquiring a transfer function of the fast tool servo system by mathematical modeling and frequency scanning test; secondly, solving an amplitude-frequency characteristic function and a phase-frequency characteristic function of the fast tool servo system; and thirdly, designing a feed-forward controller of the fast tool servo system on the basis of expected iterative leaning control algorithm, designing advanced step length m of the feed-forward controller according to the phase-frequency characteristic requirement of the expected iterative leaning control algorithm, designing advanced gain gamma of the feed-forward controller according to the amplitude-frequency characteristic requirement of the expected iterative leaning control algorithm, and correcting amplitude attenuation and phase delay in output displacement of the fast tool servo system by certain iterations. The method is simple in solving process and accurate and reliable in correction result, and enables processing precision of complex surface shapes or microstructure parts to be higher.
Description
technical field [0001] The invention mainly relates to the control field of tool processing, in particular to a correction method suitable for amplitude attenuation and phase delay in a fast tool servo system. Background technique [0002] The fast tool servo system is generally used for precision and ultra-precision turning of complex surface or microstructure parts. It refers to the high-frequency response and small-scale z-direction precision feed movement of the diamond tool controlled by the servo during the machining process. Through fast Track the height of the part surface at the processing point (x, θ), and achieve precise and efficient turning of complex surface or microstructure parts in the form of cylindrical coordinates (x, θ, z), such as figure 1 shown. [0003] The processing accuracy and application range of the fast tool servo system are limited by the dynamic performance. The mechanical moving parts and the circuit drive link will cause the output displac...
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IPC IPC(8): G05B19/404
Inventor 李圣怡戴一帆王贵林石峰陈善勇杨帆
Owner NAT UNIV OF DEFENSE TECH