A Windowed Interpolation Algorithm for High-Precision ADC Spectrum Testing

2022 ◽  
pp. 69-78
Author(s):  
Yang Yang
Keyword(s):  
High Precision ◽  
Interpolation Algorithm

The Confined Chord Error Algorithm for High Precision Machining Parametric Surface

2011 ◽  
Vol 201-203 ◽  
pp. 2334-2337 ◽  
Author(s):  
Zhi Qiang Zhang ◽  
Wen Jin Wang ◽  
Zhao Jian ◽  
Tai Yong Wang
Keyword(s):  
Surface Quality ◽  
High Precision ◽  
Order Derivative ◽  
Precision Machining ◽  
Interpolation Algorithm ◽  
Arc Length ◽  
Parametric Surface ◽  
Chord Error ◽  
First Order

The part’s surface quality of NC machining is influenced by the chord error greatly. The confined chord error algorithm for machining complex parametric surface is proposed for controlling the chord error. The arc length error is utilized to control the chord error of the interpolated point indirectly. The arc length error of interpolated point is computed by trapezia expressions, the coordinate and the first order derivative of interpolated point is computed by the interpolation algorithm. The computed error of confined chord error algorithm is discussed and the simulation indicate that the destined precision of the chord error can be satisfied by this algorithm.

Design of High Precision Multi-Channel Synchronizer Signal Generator

2012 ◽  
Vol 503-504 ◽  
pp. 1198-1202
Author(s):  
Li Min Chang ◽  
Qing Guo Zhang ◽  
Xue Yan Lv
Keyword(s):  
High Precision ◽  
Full Range ◽  
Signal Generator ◽  
Software Implementation ◽  
Interpolation Algorithm ◽  
Development Cycle ◽  
The Cost ◽  
Range Error ◽  
Work Stability

According to the characteristic of synchronizer signal, multi-channel synchronizer signal generator is designed based on USB and C8051F340. Software implementation is given using Aitken interpolation algorithm. It greatly reduces the cost of development and effectively improves the precision. Meanwhile, using the USBXPress development kit for PC and firmware development shortens the development cycle. Compared with the special numeric synchronizer converter, the price of designed Synchronizer signal generator cheap 100 times, the full range error less than 0.04º and the accuracy improved 25 times. At the same time, it has work stability, strong anti-interference and high practical value.

Manufacture of High Precision Spur Gears With End Milling Cutters

1988 ◽  
Vol 110 (4) ◽  
pp. 359-366 ◽  
Author(s):  
S. G. Papaioannou
Keyword(s):  
Design Process ◽  
High Precision ◽  
End Milling ◽  
Spur Gears ◽  
Interpolation Algorithm ◽  
Simple Geometry ◽  
Milling Machines ◽  
Nc Milling ◽  
Center Path ◽  
Gear Profile

A new method is proposed for cutting large module spur gears on NC milling machines, using end milling cutters. End milling eliminates undercutting and leads to a significant reduction of tooling costs. The method relies on the motion of a simple geometry tool rather than the shape of an expensive form tool to generate the gear profile. The tool center path is defined and computed for the standard 20 deg full-depth system. Tool steps are generated by a highly precise interpolation algorithm. The practical aspects of the method are also investigated to establish its feasibility. The computation of the maximum tool size shows that sufficient tool rigidity can be secured for gear modules greater than or equal to 10 mm. The Lewis equation is used to investigate the beam strength of the resulting tooth profile and generate data for the design process. Gears made by end milling are shown to be comparable in strength to those produced by shaping or hobbing.

DSP Curve Surface Interpolator Research Based on Open Platform

2007 ◽  
Vol 10-12 ◽  
pp. 471-475
Author(s):  
W.T. Sun ◽  
Yong Xian Liu ◽  
G.M. Sun ◽  
Y.C. Zhang
Keyword(s):  
Real Time ◽  
High Precision ◽  
High Speed ◽  
Curve Surface ◽  
Interpolation Algorithm ◽  
Limit Curve ◽  
Open Platform

For the improvement of the system real-time capability, the DSP Curve Surface interpolator has been designed to ensure high speed, high precision requirement for the machining of complexity curve surface. The hardware and software has been designed. The changeable feedrate interpolation algorithm of limit curve error has been studied. Furthermore, the algorithm has been applied to the interpolation and has well real-time capability to satisfy the requirement of high capability CNC by experimentation.

Automatic measurement of SAED patterns from asbestos minerals

1988 ◽  
Vol 46 ◽  
pp. 846-847
Author(s):  
J. C. Russ ◽  
T. Taguchi ◽  
P. M. Peters ◽  
E. Chatfield ◽  
J. C. Russ ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
High Precision ◽  
Diffraction Data ◽  
Automatic Measurement ◽  
Automatic Method ◽  
Important Method ◽  
X Ray ◽  
Integrated Intensity ◽  
Asbestiform Minerals ◽  
True Center

Conventional SAD patterns as obtained in the TEM present difficulties for identification of materials such as asbestiform minerals, although diffraction data is considered to be an important method for making this purpose. The preferred orientation of the fibers and the spotty patterns that are obtained do not readily lend themselves to measurement of the integrated intensity values for each d-spacing, and even the d-spacings may be hard to determine precisely because the true center location for the broken rings requires estimation. We have implemented an automatic method for diffraction pattern measurement to overcome these problems. It automatically locates the center of patterns with high precision, measures the radius of each ring of spots in the pattern, and integrates the density of spots in that ring. The resulting spectrum of intensity vs. radius is then used just as a conventional X-ray diffractometer scan would be, to locate peaks and produce a list of d,I values suitable for search/match comparison to known or expected phases.

On effects of non-systematic reflections on weak-beam images of partial dislocations

1991 ◽  
Vol 49 ◽  
pp. 688-689
Author(s):  
K. Z. Botros ◽  
S. S. Sheinin
Keyword(s):  
High Precision ◽  
Stacking Fault ◽  
Important Application ◽  
Stacking Fault Energy ◽  
Sharp Peak ◽  
Weak Beam ◽  
Partial Dislocations ◽  
Deviation Parameter ◽  
Beam Diffraction

The main features of weak beam images of dislocations were first described by Cockayne et al. using calculations of intensity profiles based on the kinematical and two beam dynamical theories. The feature of weak beam images which is of particular interest in this investigation is that intensity profiles exhibit a sharp peak located at a position very close to the position of the dislocation in the crystal. This property of weak beam images of dislocations has an important application in the determination of stacking fault energy of crystals. This can easily be done since the separation of the partial dislocations bounding a stacking fault ribbon can be measured with high precision, assuming of course that the weak beam relationship between the positions of the image and the dislocation is valid. In order to carry out measurements such as these in practice the specimen must be tilted to "good" weak beam diffraction conditions, which implies utilizing high values of the deviation parameter Sg.

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