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Chatter active control method under driver saturation without model parameters

A technology of active control and drive, applied in the direction of simulator, program control, computer control, etc., can solve difficult, troublesome and other problems

Active Publication Date: 2016-06-22
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

[0005] Most of the current active chatter control methods require process model parameters, and these parameters will change with different cutting conditions, machine tools, workpieces and tools, so it is cumbersome and difficult to accurately obtain these parameters
In actual processing, it is impossible for the driver to have unlimited output capability, so output saturation is ubiquitous

Method used

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  • Chatter active control method under driver saturation without model parameters
  • Chatter active control method under driver saturation without model parameters
  • Chatter active control method under driver saturation without model parameters

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific implementation examples described here are only used to explain the present invention, not to limit the present invention.

[0050] Combine below figure 1 and figure 2 The present invention is described in detail.

[0051] In the actual turning process, for any specified spindle speed n, when the depth of cut b is very small, the dynamic cutting force F d The impact on the whole turning process is very small, that is, the whole turning process is stable, but the turning efficiency is very low at this time, which does not meet our requirements; therefore, we hope to have a larger depth of cut to obtain higher processing efficiency, but with With the increase of cutting depth b, the whole system...

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Abstract

The invention discloses a chatter active control method under driver saturation without model parameters, and relates to the field of machining automation. According to the technical scheme, the characteristic that the upper bound of the model parameters and the upper bound of interference can be estimated online by utilizing the self-adaptive control rate is utilized, the self-adaptive boundary layer control rate is designed by adopting the Liapunov function, and robustness and effectiveness of the method are further enhanced by utilizing the sliding mode reaching rate so that chatters are suppressed by changing the intrinsic characteristic of a machine tool through a driver, the beneficial effects that the whole lathing process can still be maintained to be stable in lathing work under the conditions of no model parameters, driver saturation and high cutting depth can be achieved, and thus the surface quality of workpieces can be guaranteed and lathing efficiency can also be enhanced.

Description

technical field [0001] The invention relates to the field of mechanical automation, in particular to an active control method for flutter under model-free parameters and driver saturation. Background technique [0002] Cutting chatter is a strong relative vibration between the machine tool, workpiece and tool during machining, and it is a complex dynamic instability phenomenon. The occurrence of chatter is closely related to the structural characteristics and dynamic characteristics of the machine tool itself, the material characteristics of the workpiece and the cutting tool, and the selection of cutting parameters. In machining, cutting chatter not only affects the machining accuracy of the workpiece and reduces the machining efficiency, but also causes damage to machine tool components and tools, and generates noise. Cutting chatter control can effectively suppress machining chatter and improve machining productivity, so it has received extensive attention. [0003] In ...

Claims

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Application Information

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IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356
Inventor 马海峰熊振华吴建华朱向阳
Owner SHANGHAI JIAO TONG UNIV
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