NURBS curve self-adaptive look-ahead interpolation method

An adaptive and interpolation technology, applied in the direction of instruments, computer control, simulators, etc., can solve problems such as real-time interpolation, poor precision, and low processing efficiency

Pending Publication Date: 2021-03-12
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing interpolation methods based on forward-looking technology have problems: poor accuracy, low processing efficiency, real-time interpolation, and unstable speed

Method used

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  • NURBS curve self-adaptive look-ahead interpolation method
  • NURBS curve self-adaptive look-ahead interpolation method
  • NURBS curve self-adaptive look-ahead interpolation method

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Experimental program
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Effect test

Embodiment Construction

[0086] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments: taking this as an example to further describe and illustrate the present application.

[0087] The inventive method is carried out simulation verification on PC, and used programming software is Microsoft Visual C ++ 6.0, uses C language to write program, carries out simulation verification on MATLAB platform, and the spline curve selected is NURBS curve.

[0088] The main technical imputation parameters of the test environment are as follows:

[0089] Operating system: Microsoft Windows 7

[0090] CPU: Intel(R) Core(TM) i7-7700

[0091] Main frequency: 3.60GHz

[0092] Memory: 8G

[0093] The interpolation parameters of the CNC system are as follows:

[0094] Maximum speed F=0.05m / s

[0095] Maximum acceleration A max =0.002m / s 2

[0096] Maximum jerk J max =0.0002m / s 3

[0097] Maximum chord height error E max =0.002mm

...

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Abstract

The invention discloses an NURBS curve self-adaptive prospective interpolation method. The method comprises the following steps: obtaining interpolation parameters of each interpolation point by adopting a second-order Taylor expansion; finding an extremely low speed point according to the curvature change condition, and segmenting the curve; adaptively adjusting the feeding speed by using constraint conditions of the curve bow height error, the normal maximum acceleration, the jerk, the machine tool characteristics and the machine tool dynamic characteristics; performing path planning througha trigonometric function acceleration and deceleration control algorithm to obtain acceleration and deceleration start and end parameters, and recording the parameters into an acceleration and deceleration array; obtaining acceleration section information and acceleration and deceleration distances according to the obtained deceleration section information and prospective interpolation; and calculating the feeding speed in real time for interpolation according to the obtained interpolation parameters, the feeding speed and a trigonometric function acceleration and deceleration equation. Flexible acceleration and deceleration control is achieved, the machining speed changes stably, the smoothness of the surface of a workpiece is improved, in addition, the feeding speed is adjusted in a self-adaptive mode, and high-speed and high-precision machining of the workpiece is guaranteed.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a NURBS curve adaptive forward-looking interpolation method. Background technique [0002] With the continuous development of CNC machine tools, the traditional interpolation method can no longer meet the current high-speed and high-precision machining requirements, and it is easy to cause fluctuations in feed speed and affect the flatness of the workpiece surface. Because the NURBS curve has good intuition, locality, convergence and approximation, the data transmission volume is small and the transmission speed is fast, and the curve can be directly interpolated. Applying NURBS curves to process complex curves and surfaces can greatly improve the machining accuracy and efficiency of workpieces. NURBS interpolation technology has become the main indicator to measure the machining capabilities of CNC machine tools. [0003] At present, the core technology of N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/41
CPCG05B19/41G05B2219/34083
Inventor 盖荣丽马淑雅
Owner DALIAN UNIV
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