An Automatic Segmentation Algorithm Used in Pipeline Integrity Alignment Sheet Design

2010 ◽  
Author(s):  
Lei Guo ◽  
Lijian Zhou ◽  
Shaohui Jia ◽  
Li Yi ◽  
Haichong Yu ◽  
...  
Keyword(s):  
Design Method ◽  
Automatic Segmentation ◽  
Segmentation Algorithm ◽  
Basic Unit ◽  
Work Efficiency ◽  
Manual Method ◽  
Pipeline Section ◽  
Section Design ◽  
Intersection Points ◽  
Curve Simplification

Pipeline segmentation design is the first step to design alignment sheet. In this step, several rectangular boxes are used to cover pipeline and each box will become the basic unit of alignment sheet design. After studying various pipeline alignment sheet mapping technologies, the author found that traditional manual design method, which can take advantage of designers’ subjectivity, causes low work efficiency. By reviewing and studying existing works at home and abroad, the author believed that it is possible and feasible to develop an automatic segmentation algorithm based on existing curve simplification algorithms to improve to improve the efficiency of pipeline section design and alignment sheet mapping. Based on several classical curve simplification algorithms, the author proposed the automatic segmentation algorithm, which automatically adjusts the location of rectangular boxes according to the number of pipeline/circle intersection points and pipeline/ rectangular box intersection points. Finally, through comparing time and result with the traditional manual method, the author proved the algorithm’s effectiveness and feasibility.

Architecture and Paper Structures – Could Paper-Folding Become a Methodology in Architecture?

2014 ◽  
Vol 548-549 ◽  
pp. 1627-1634 ◽  
Author(s):  
Sílvia Edite Marcelo Calretas ◽  
Mário Say Ming Kong
Keyword(s):  
Design Method ◽  
Single Point ◽  
Spatial Modelling ◽  
Basic Unit ◽  
Structural Systems ◽  
Intuitive Thinking ◽  
Paper Folding ◽  
Japanese Art ◽  
Sustainable Materials ◽  
Real Essence

When we think of paper-folding, we usually think first of the name that is usually associated with it: origami. But in the field of architecture, origami is more than just imagining an animal or flower which is what this word usually brings to mind. In architecture, we extend the meaning to take in the real essence of the word – that of great structural and constructional loads. The basic unit of origami – the fold – allows us to start manipulating space and even to create space itself. Paper-folding, with its spatial modelling potential, is to three-dimensionality what drawing is to two-dimensionality. It is after all an ancient Japanese art which encapsulates the advantages of intuitive thinking and fast modelling, once the basic elements of folding are known. Heino Engel (2001) in his book “Structural Systems”, describes intensive studies on types of structures which derive from this systematization. And the architect Ming Tang often uses structures in his projects which clearly originate in the concept of origami, and he correlates these structures with sustainable materials. The architect Michael Hansmeyer manages to incorporate all the beauty of the action of folding with the help of a computer, where the final result is a shape that approaches a real application at an architectural level. Over time, there have been numerous people who have found a relationship between the harmony and proportions of paper-folding and their own studies and projects. What is missing is a single point where clear concepts on the possibilities of folding and the results of those who have experimented with it can be brought together. This cataloguing, which is being carried out in this Master’s dissertation, is intended to be a contribution to the design method in architecture, through which the architect may achieve spatial dexterity over a piece of paper.

Research on Automatic Segmentation Methods of Multi-Beam Waterjet Cutting Process Drawings

2011 ◽  
Vol 314-316 ◽  
pp. 1571-1575
Author(s):  
Hui Kang Yang ◽  
Dean Zhao ◽  
Jin Liang Guo ◽  
Jun Zhang ◽  
Bo Chen
Keyword(s):  
Automatic Segmentation ◽  
Cutting Process ◽  
Secondary Development ◽  
Manual Segmentation ◽  
Work Efficiency ◽  
Waterjet Cutting ◽  
Development Tool ◽  
Segmentation Methods ◽  
Low Efficiency

Currently, some manual segmentation problems exist in multi-beam waterjet cutting process drawings, such as low efficiency, incomplete segmentation and so on. In order to solve the problems, this paper designs a set of criteria for multi-beam cutting process and proposes the method of partition-classification trim, then uses the secondary development tool which is embedded in AutoCAD to program three user-defined commands, and these commands can partition the drawing by region, classify and trim the entities in the cutting process drawing. Through inputting the three simple commands on the command lines, it can realize automatic segmentation of cutting process drawings. Finally, the feasibility of this method is proved by a segmentation experiment. It can effectively solve the problems which exist in manual segmentation and greatly improve work efficiency.

Refinement of the Mean Streamline Method of Blade Section Design

1977 ◽  
Vol 99 (3) ◽  
pp. 561-566 ◽  
Author(s):  
M. W. McBride
Keyword(s):  
Design Method ◽  
Lift Coefficient ◽  
Recent Effort ◽  
Mean Flow ◽  
Surface Pressure Distribution ◽  
Section Design ◽  
Blade Section ◽  
The Mean ◽  
Design Characteristics ◽  
Streamline Method

The Mean Streamline Method of cascade blade section design developed by Wislicenus correlates the differences in the shape of the blade camber-line and the one-dimensional mean flow streamline. Recent effort has been directed toward the extension of this design method, to cover a wider range of loading distributions, including trailing edge loaded blades, and blades with higher than usual solidities (C/S). A computer analysis of many available blade shapes for subsonic compressors and pumps with differing loading distributions that have been tested experimentally was made. Relations between the deviation of the camber-line from the mean flow streamline as a function of the lift coefficient, solidity, a loading distribution parameter and blade stagger angle were found. Using these correlations, a computerized design method was developed which rapidly produces blade shapes with specified design characteristics. A radial equilibrium theory is utilized to compute the actual blade surface pressure distribution. When a blade is to be designed which is similar to existing designs, the method has proven very reliable.

Sign in / Sign up

Export Citation Format

Share Document