Experimental research on in-process measurement of large-scale gear profile with a straight-line basis

1993 ◽  
Author(s):  
Nianzhao Liao ◽  
Dai-Hua Wang ◽  
Xiao-Ying Fu
Keyword(s):  
Experimental Research ◽  
Large Scale ◽  
Process Measurement ◽  
Straight Line ◽  
Gear Profile

Impact of plumb location on the determination accuracy of chimney heeling by photographic method

2017 ◽  
Vol 919 (1) ◽  
pp. 55-59
Author(s):  
O.V. Raskatkina
Keyword(s):  
Image Processing ◽  
Experimental Research ◽  
Optimal Location ◽  
Paint System ◽  
Photographic Method ◽  
Round Shape ◽  
Straight Line ◽  
Left And Right

There is a method of using the corded plumb as vertical reference straight line, located in front of the objective of a digital photocamera in the article. When we take picture of the object under study, there will be this straight line in the photo, from which we can carry out all necessary measurements in the Paint system with the following conversion them into metric system. All possible variants of location of the reference straight line relative to it axis are considered by the example of the construction of the tower round shape and it is shown a method of heeling calculation by image processing results. Experimental research to determine the degree of influence of plumb location in the photo relative to it axe on the accuracy of the heeling determination was carried out by shooting the brick chimney with the 30 metres height when the plumb is located on the chimney axis and on different distance from the left and right of the axis. It is set in the result that the plumb location has influence on the accuracy of heeling determination. The optimal location is on the centre of the top section of the chimney and there is shown the method of accounting corrections due to inaccurate location.

scholarly journals A very straight and collimated outflow in the core of OMC-1

1991 ◽  
Vol 147 ◽  
pp. 491-493
Author(s):  
J. Schmid-Burgk ◽  
R. Güsten ◽  
R. Mauersberger ◽  
A. Schulz ◽  
T. L. Wilson
Keyword(s):  
Large Scale ◽  
Position Angle ◽  
Full Length ◽  
Hii Region ◽  
The Core ◽  
Straight Line ◽  
Outflow System

We have recently discovered a large-scale (200″) outflow system in the core of OMC-1 (fig. 1), centered about 100″ South of IRc2 and extending over some 120″ (red lobe) resp. 60″ (blue) along a position angle of —31° (Schmid-Burgk et al. 1990). The blue lobe which might actually protrude into the HII region M42 is poorly defined in CO 2-1, but the red lobe reveals a number of remarkable properties which we summarize here:The outflow is very straight and smooth. Over the full length of 120″, the center of any cross scan deviates by not more than about 1″ from a straight line. This line passes to within 2″ the peak of the submm source FIR4 of OMC-1 (Mezger, Wink and Zylka 1990) and the mm continuum peak CS3 (Mundy et al. 1986); it also cuts across the red and blue SiO-outflow lobes recently discovered some 5-10″ to either side of FIR4 (Ziurys, Wilson and Mauersberger 1990). It thus seems that the “base” of our large-scale CO jet can be seen as well.

scholarly journals Linear Correction and Matching Method for 3D Line Structure Reconstruction

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Di Jia ◽  
Yuxiu Li ◽  
Si Wu ◽  
Ying Liu
Keyword(s):  
3D Reconstruction ◽  
Large Scale ◽  
Computational Cost ◽  
Small Neighborhood ◽  
Line Detection ◽  
Reconstruction Technique ◽  
Matching Method ◽  
Line Structure ◽  
Straight Line ◽  
Linear Correction

The 3D reconstruction technique using the straight-line segments as features has high precision and low computational cost. The method is especially suitable for large-scale urban datasets. However, the line matching step in the existing method has a mismatching problem. The two main reasons for this problem are the line detection result is not located at the true edge of the image and there is no consistency check of the matching pair. In order to solve this problem, a linear correction and matching method for 3D reconstruction of target line structure is proposed in this paper. Firstly, the edge features of the image are extracted to obtain a binarized edge map. Then, the extended gradient map is calculated using the edge map and the gradient to establish the gradient gravitational map. Secondly, the straight-line detection method is used to extract all the linear features used for the 3D reconstruction image, and the linear position is corrected by the gradient gravitational map. Finally, the point feature matching result is used to calculate the polar line, and the line matching results of the adjacent three images are used to determine the final partial check feature area. Then, random sampling is used to obtain the feature similarity check line matching result in the small neighborhood. The aforementioned steps can eliminate the mismatched lines. The experimental results demonstrate that the 3D model obtained using the proposed method has higher integrity and accuracy than the existing methods.

Development and Calibration of a Large-scale Rainfall Simulator for the Urban Flood Experimental Research

2017 ◽  
Vol 17 (6) ◽  
pp. 433-441
Author(s):  
Tae Sung Cheong ◽  
◽  
Hyeonseok Choi ◽  
Teakjo Ko ◽  
◽  
...  
Keyword(s):  
Experimental Research ◽  
Large Scale ◽  
Rainfall Simulator ◽  
Urban Flood

Experimental Research on Self-Alignment Design Principle of a Large-Scale Precise Machine Bed

2010 ◽  
Vol 102-104 ◽  
pp. 306-310
Author(s):  
Zhan Hui Yan ◽  
Yi Cao ◽  
Jun Yi Yu
Keyword(s):  
Experimental Research ◽  
Machine Tools ◽  
Thermal Deformation ◽  
Large Scale ◽  
Design Principle ◽  
Simulation Experiment ◽  
Good Precision ◽  
Key Points ◽  
Machined Parts ◽  
Precise Machine

In order to eliminate thermal deformation of large-scale precise machine tools caused by ambient temperature change, self-alignment design principle and key points are proposed for a large-scale precise machine tools, Self-alignment simulation experiment, machined parts experiment and compared results for self-alignment rail grinder and other similar products are analysed, the present analysis show that self-alignment rail grinder has many advangtages of good precision, straightness stability.

Experimental Research of Shrinkage in Thick Concrete Elements

2015 ◽  
Vol 1106 ◽  
pp. 122-127
Author(s):  
Jan L. Vítek ◽  
David Čítek ◽  
Petr Tej
Keyword(s):  
Numerical Analysis ◽  
Experimental Research ◽  
Large Scale ◽  
Concrete Structures ◽  
Heat Of Hydration ◽  
Experimental Results ◽  
Thick Wall ◽  
Floor Slab ◽  
Scale Models ◽  
Concrete Elements

At the construction of complex concrete structures of the laser centre, the client required verification of casting procedures on large scale models. Models of the thick floor slab and of the thick wall were built in the scale 1:1, where the temperatures induced by heat of hydration and shrinkage strains were measured. The results of the experiments showed that the measured strains were larger than those expected on the basis of prediction according to European codes. Experimental results were compared with the results of numerical analysis.

scholarly journals The Analysis of the Possibility of Feeding a Liquid Catalyst to a Coal Dust Channel

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8521
Author(s):  
Zdzisław Bielecki ◽  
Marek Ochowiak ◽  
Sylwia Włodarczak ◽  
Andżelika Krupińska ◽  
Magdalena Matuszak ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Experimental Research ◽  
Lower Energy ◽  
Power Plants ◽  
Large Scale ◽  
Coal Dust ◽  
Exhaust Gases ◽  
Flow Parameters ◽  
Channel Outlet

This article presents the concept of a method of improving the dynamics of combustion in boilers operating in power plants, cogeneration plants, and heating plants by introducing a catalyst that is fed with a carrier in the form of droplets. Thanks to the proposed method, a greater degree of fuel burnout can be obtained, which, in turn, results in lower energy consumption in the case of producing the same amount of power. The parameters of the emitted exhaust gases and ash are also improved. The method described in the article involves the adding of a catalyst to the dust pipe of the boiler, which improves the combustion parameters. The catalyst was implemented using a sprayer/nebulizer. In order to obtain the correct flow parameters, the sprayer was modeled using CFD calculations. The calculations include trajectories, velocities and concentrations with regards to various flow parameters. Particular attention should be paid to the model of the evaporation of moving droplets. The results of these calculations enable the parameters that guarantee that the catalyst reaches the dust channel outlet in the desired form to be assessed. The analysis is an introduction to experimental research that is carried out on a medium and large scale.

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