Design and Implementation of the Stone Elliptical Arc Contour Fitting Algorithm

2013 ◽  
Vol 579-580 ◽  
pp. 241-247
Author(s):  
Dong Wei Xu ◽  
Jian Qun Liu ◽  
Xian Fu Wu ◽  
Wei Qiang Gao
Keyword(s):  
Chebyshev Approximation ◽  
Large Radius ◽  
Circular Saw ◽  
Cutting Machine ◽  
Trajectory Simulation ◽  
Maximum Value ◽  
Fitting Algorithm ◽  
Start Section ◽  
Contour Fitting ◽  
Fitting Error

Elliptical arcs have been widely used in stone contours, but the circular saw of the existing stone bridge cutting machine can only cut stone contours which compose of long lines and large radius arcs. The elliptical arc is often fitted by small line segments or small arc segments, and the circular saw cannot be used to process the stone elliptical arc contour. Therefore, a better choice of fitting the elliptical arc in the stone contour is the four-arc fitting algorithm. The traditional four-arc fitting ellipse algorithm can only fit the whole ellipse, in order to fit elliptical arcs, a new fitting algorithm of four-arc fitting elliptical arc is designed. Firstly, identify the stone contour and analyze the elliptical entities section from the DXF file, and divide the elliptical arc curve into several arcs according to the angular relationship. Then adopting the Chebyshev approximation theory of four-arc fitting ellipse, the preliminary fitting of the elliptical arc is performed, and re-fit the start section and end section of the elliptical arc curve, the elliptical arc fitting algorithm is designed. In addition, the maximum value of fitting error has been calculated. Finally, by using the Visual C++ as the developing software, the stone elliptical arc contour fitting algorithm and its processing trajectory simulation are realized. Testing results show that the fitting algorithm can meet the requirements of the circular saw cutting the stone elliptical arc contour.

Noise Analysis of Diamond Saw Blade

2015 ◽  
Vol 1095 ◽  
pp. 773-776
Author(s):  
Min Zhao ◽  
Lin Zhang ◽  
Bei Ming Tang ◽  
Kattan Maher
Keyword(s):  
Working Condition ◽  
Noise Analysis ◽  
Experimental Results ◽  
Circular Saw ◽  
Cutting Machine ◽  
Different Types ◽  
Diamond Saw ◽  
Saw Blade

In this paper, noise of diamond circular saw blades has been measured, five different types of saw blades are used to measure their noise under different working condition. By analyzing of the experimental results, the effect of different factors on the saw blade noise is studied. The result shows that the increasing the speed of cutting machine or the diameter of blade, noise will become larger. The noise of saw blade with a hole or water slot would be greater than others without any hole or water slot.

Design and Implementation of the Circular Saw CNC Machining of the Stone Bridge Cutting Machine

2013 ◽  
Vol 579-580 ◽  
pp. 289-294
Author(s):  
Xian Fu Wu ◽  
Jian Qun Liu ◽  
Dong Wei Xu ◽  
Wei Qiang Gao
Keyword(s):  
Tangential Direction ◽  
Cnc Machining ◽  
Numerical Control ◽  
Cnc System ◽  
Numerical Control Machining ◽  
Circular Saw ◽  
Cutting Machine ◽  
Motion Control Card ◽  
Machining Lines ◽  
Angle Calculation

The stone bridge cutting machine is a multi-function processing machine which can saw, mill and grind. The circular saw machining is the most common processing way. This paper introduced the angle calculation method of the circular saw CNC(Computer Numerical Control) machining lines and arcs, focused on the tangential following algorithm of the circular saw, which was that the tool moved along the tangential direction of the circle or arc with the interpolated motion. Meanwhile, combining with the mechanical property of the stone bridge cutting machine, that is, the rotation angle of the C-axis was less than 360 degrees, two kinds of segmentation machining algorithms were put forward. Based on PC & motion control card, using VC++ software, the stone bridge cutting machine CNC system software was developed. By running stone bridge cutting machine CNC system and testing in the factory, the results show that the circular saw machining is stable, and can meet the requirements of the circular saw CNC cutting processing.

Visual Integrated Measurement on Geometry Parameters of Circular Saw Blade

2010 ◽  
Vol 97-101 ◽  
pp. 4346-4350
Author(s):  
Qing Min Liu ◽  
Ling Zhao ◽  
Wei Feng Dai
Keyword(s):  
Radial Direction ◽  
Rake Angle ◽  
Least Square ◽  
Roundness Error ◽  
Clearance Angle ◽  
Circular Saw ◽  
Radial Rake Angle ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
Fitting Error

Established the circular saw blade visual measurement system and developed geometry parameters measurement software. Calculated the inner and outer circle diameters and the roundness error, the tooth angle and the radial rake angle, the radial direction clearance angle on the basis of image processing. Calibrated the measured part using the standard gauge block. Improved the circle and the line sub-pixel methods. Experiment results showed that the fitting error of improved least–square linear fitting method was quarter of ordinary least–square linear fitting error under small difference of orientation time. The diameters of the inner circle and the outer circle ,the roundness error ,the tooth cusp angle and the radial rake angle, the radial direction clearance angle were respectively 25.204mm, 193.624mm, 0.005mm, 59.999°±0.00695°, 15.004°±0.0104°, 14.997°±0.0137° while taken sub-pixel method.

Prothrombin Evaluation as Obtained by Kinetics Studies of Antigen-Antibody Reaction in a Laser Nephelometer

1984 ◽  
Vol 52 (01) ◽  
pp. 015-018 ◽  
Author(s):  
A Girolami ◽  
A Sticchi ◽  
R Melizzi ◽  
L Saggin ◽  
G Ruzza
Keyword(s):  
Liver Cirrhosis ◽  
Cirrhotic Patient ◽  
Maximum Rate ◽  
Serum Proteins ◽  
Clotting Factors ◽  
Kinetics Studies ◽  
Maximum Value ◽  
Time Required ◽  
Antigen Antibody ◽  
Kinetics Of

SummaryLaser nephelometry is a technique which allows the evaluation of the concentration of several serum proteins and clotting factors. By means of this technique it is also possible to study the kinetics of the reaction between antigen and antibody. We studied the kinetics of the reaction between prothrombin and an antiprothrombin antiserum using several prothrombins namely: Prothrombin Padua, prothrombin Molise, which are two congenital dysprothrombinemias, cirrhotic, coumarin or normal prothrombins. Different behaviors in the kinetics of the reactions were shown even when the concentration of prothrombins was about the same in all plasma tested. These differences were analyzed by means of a computer (Apple II 48 RAM) programmed to solve four unknown equations (Rodbard’s equation). From the data so obtained one can see that when voltages at the beginning and at the end of the reaction are in all cases about the same, a clear difference in the time required to reach half the maximum value of the voltage can still be demonstrated. This parameter, which is expressed in minutes, is longer in coumarin and prothrombin Molise than in controls. On the contrary it is shorter in prothrombin Padua and has about the same value of controls in the cirrhotic patient. Moreover the time at which the maximum rate is obtained is longer in coumarin and prothrombin Molise than in controls and shorter in liver cirrhosis and prothrombin Padua. In conclusion data obtained show that coumarin prothrombin behaves in a different way from cirrhotic prothrombin and also that there is a different behaviour between the two congenital dysprothrombinemias.

ESTIMATION OF ABOVE GROUND BIOMASS OF THE THREE SITES (GRAZED SITE, PROTECTED SITE AND SEED SOWN SITE) FOR COMPARING THEIR PRODUCTIVITY IN KASHMIR VALLEY

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
AFSHAN ANJUM BABA ◽  
SYED NASEEM UL-ZAFAR GEELANI ◽  
ISHRAT SALEEM ◽  
MOHIT HUSAIN ◽  
PERVEZ AHMAD KHAN ◽  
...  
Keyword(s):  
Protected Areas ◽  
Aboveground Biomass ◽  
Plant Biomass ◽  
Summer Season ◽  
Above Ground Biomass ◽  
Spring Season ◽  
Kashmir Valley ◽  
Ground Biomass ◽  
Maximum Value ◽  
Protected Site

The plant biomass for protected areas was maximum in summer (1221.56 g/m2) and minimum in winter (290.62 g/m2) as against grazed areas having maximum value 590.81 g/m2 in autumn and minimum 183.75 g/m2 in winter. Study revealed that at Protected site (Kanidajan) the above ground biomass ranged was from a minimum (1.11 t ha-1) in the spring season to a maximum (4.58 t ha-1) in the summer season while at Grazed site (Yousmarag), the aboveground biomass varied from a minimum (0.54 t ha-1) in the spring season to a maximum of 1.48 t ha-1 in summer seasonandat Seed sown site (Badipora), the lowest value of aboveground biomass obtained was 4.46 t ha-1 in spring while as the highest (7.98 t ha-1) was obtained in summer.

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