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Optimized NURBS and DDA curve two level interpolation method

An interpolation and curve technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of complex parameter adjustment, high price, not in line with the development trend of open CNC systems, etc.

Active Publication Date: 2015-05-20
中国科学院沈阳计算技术研究所有限公司
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Problems solved by technology

However, the traditional NURBS spline processing complex surface needs to use a dedicated controller, which is expensive and complicated to adjust parameters, which does not conform to the development trend of open CNC systems.

Method used

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  • Optimized NURBS and DDA curve two level interpolation method
  • Optimized NURBS and DDA curve two level interpolation method
  • Optimized NURBS and DDA curve two level interpolation method

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0046] The algorithm of the invention includes a trajectory generation algorithm and a two-stage interpolation algorithm of NURBS and DDA.

[0047] The main problem to be solved by the trajectory generation algorithm is the method of obtaining the interpolation position according to the parameter points. Its trajectory curve is expressed as follows:

[0048] C ( u ) = Σ i = 0 n N i , p ( u ) W i ...

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Abstract

The invention relates to an optimized NURBS and DDA curve two level interpolation method which is composed of a track generation phase, a conversion phase and a DDA interpolation phase. The track generation phase mainly executes NURBS interpolation algorithm, a position of a corresponding point of the next interpolation period is generated according to the track generation algorithm. The DDA interpolation phase mainly generates corresponding servo burst according to the position increment of each interpolation period to transmit to a servo system. The conversion phase mainly converts the position of each interpolation period in the NURBS interpolation phase into a position increment of the DDA phase. Each phase is connected through fifo. The optimized NURBS and DDA curve two level interpolation method has the advantages that the system communication delay is low, the efficiency is high, the portability is good, and the program is friendly to Cache.

Description

technical field [0001] The invention relates to a design method of a two-stage interpolator for NURBS curves and DDA curves and a trajectory calculation method for spline curves, and belongs to the technical field of numerical control processing. Background technique [0002] The traditional numerical control system can only perform simple linear interpolation and circular interpolation, which requires that when processing workpieces with complex shape curves, CAD / CAM can only use a large number of straight lines or circular arcs under given error constraints. Approximate small line segments or arcs. This method is likely to cause CAD / CAM software to generate a large number of processing program codes, increase the transmission time between CAD / CAM and CNC systems, and affect the real-time performance of the system. The International Organization for Standardization, NURBS curve positioning, the mathematical representation of the geometric shape of industrial products and t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘荫忠徐勤朋王允森赵启杰
Owner 中国科学院沈阳计算技术研究所有限公司
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