The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Robert A. Rhea - One of the best experts on this subject based on the ideXlab platform.
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Building 3D Piping Models
Pipe Drafting and Design, 2012Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:An overview of the application of 3D modeling techniques as they apply to pipe facilities is provided. A comparison of orthographic views and pictorial renderings is depicted. The feature of clash or interference detection in pipe modeling software is demonstrated. A sample Piping Isometric and bill of materials generated by a 3D modeling software is provided. A broad review of how various 3D model elements are developed with Plant Design Management System (PDMS) software is shown. Screen captures of the actual commands used by PDMS to build various 3D model components ranging from vessels to foundations to pipe is included.
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Chapter 13 – Piping Isometrics
Pipe Drafting and Design, 2012Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:Publisher Summary The Piping Isometric is an important drawing that serves several purposes. It is the primary source for material take-off of each pipe configuration in a facility. Material take-off is the process by which each individual component that makes up a pipe configuration is tabulated for purchase or procurement. This means that all Piping components (elbows, flanges, nuts, bolts, washers, gaskets, etc.) must be counted so that purchases of those items can be made. The tabulated results are referred to as the bill of materials. Isometrics also serve as fabrication drawings. Once drawn and properly dimensioned, Isometrics are provided to fabricators who build each Piping configuration. Fabricators will use the completed Isometrics to build shop spools. Shop spools are detailed specifically for pipe welders and fitters with precise cut-lengths and weld symbols. After configurations are fabricated, X-rayed, painted, and shipped to the construction site, Isometric drawings serve as an aid to the construction and erection of the facility by providing workers with the locations of tie-ins, connections, and routings.
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Chapter 13 – Piping Isometrics
Pipe Drafting and Design, 2002Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:Publisher Summary This chapter deals with the explanation of Piping Isometrics. An Isometric is a type of three-dimensional drawing known as a “pictorial.” Isometrics—or “isos” as they are commonly called—are developed using the three primary dimensions of an object: height, width, and depth. Piping Isometric is an important drawing that serves several purposes. It is the primary source for material take-off of each pipe configuration in the facility. Material take-off is the process by which each individual component that makes up a pipe configuration is tabulated for purchase or procurement. To make Piping Isometrics look uniform, most companies use the grid units on the Isometric vellum to establish sizes for fitting, flange, and valve symbols. Isometric symbols drawn with AutoCAD can be developed so that a single orientation of the symbol can be used in any of the Isometric axes. Isometric symbols can be drawn, rotated, and WBLOCKed for repeated use in any drawing at any Isometric angle.
Weiqing Tang - One of the best experts on this subject based on the ideXlab platform.
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A unified framework for authenticating topology integrity of 2D heterogeneous engineering CAD drawings
Multimedia Tools and Applications, 2016Co-Authors: Zhiyong Su, Lang Zhou, Weiqing TangAbstract:This paper presents a novel unified framework for authenticating topology integrity of 2D heterogeneous engineering CAD drawings. Topology information, through which a variety of engineering reports are generated, plays the most important role in the engineering CAD field. However, topology integrity authentication for engineering CAD drawings is still in its infancy and few efforts were made in the literature. By efficiently extracting topological and geometric features regardless of their heterogeneity with respect to geometrical shape and topology representation, the proposed framework supports verifying topology integrity for various heterogeneous engineering CAD drawings, such as process flow diagrams (PFD), Piping and instrument drawings (P&ID), Piping Isometric drawings (ISO) as well as sectional drawings. Topology authentication is achieved through embedding local topological features into geometric features by introducing a generic and effective semi-fragile watermarking scheme. A novel descriptor, called topology local binary patterns (T-LBP), is proposed to extract local topological features of heterogeneous drawings. Theoretical analysis and experiments have demonstrated the discrimination power, robustness and sensitivity of the proposed T-LBP descriptor. We also carry out further experiments to prove that the proposed framework can not only detect and locate malicious topological modifications, but also yield strong robustness against various topology preserving modifications.
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Topology authentication for Piping Isometric drawings
Computer-aided Design, 2015Co-Authors: Zhiyong Su, Weiqing Li, Xin Yang, Weiqing TangAbstract:Piping Isometric drawings, which feature their intrinsical topological relation rather than just geometrical shape, are important industrial art works in the field of Computer-Aided Design (CAD). This paper takes a fresh look at the topology integrity authentication of Piping Isometric drawings, which has not been mentioned before in the literature, from the digital watermarking perspective. A blind and semi-fragile watermarking based algorithm is proposed to address the referred interesting issue. The topology authentication problem of Piping Isometric drawings is investigated. In addition to the stretching operation, both global and local similarity transformation operations, which are critical problems in the case of watermarking embedding and extraction, are analyzed in detail. The topological graph is extracted and constructed from the drawing firstly. Then, similarity transformation invariants are constructed as watermarks carriers for each node. After that, the topological relation among joint components is encoded into singular watermarks for each node of the graph. These generated topology sensitive watermarks are embedded into geometrical invariants of each node via quantization index modulation. Theoretical analysis and experimental results demonstrate that our approach yields a strong ability in detecting and locating unauthorized topology attacks while achieves robustness against both global and local similarity transformations especially the stretching operation. The proposed scheme can be employed to authenticate topology integrity for each of the drawings derived from the model individually in industry practices. The topology authentication problem of Piping Isometric drawings is addressed.A semi-fragile watermarking scheme for the topology authentication is proposed.The proposed scheme is robust against local similarity transformations.The proposed scheme is invariant to the stretching operation on pipes.The proposed scheme provides good tamper localization accuracy.
Roy A. Parisher - One of the best experts on this subject based on the ideXlab platform.
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Building 3D Piping Models
Pipe Drafting and Design, 2012Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:An overview of the application of 3D modeling techniques as they apply to pipe facilities is provided. A comparison of orthographic views and pictorial renderings is depicted. The feature of clash or interference detection in pipe modeling software is demonstrated. A sample Piping Isometric and bill of materials generated by a 3D modeling software is provided. A broad review of how various 3D model elements are developed with Plant Design Management System (PDMS) software is shown. Screen captures of the actual commands used by PDMS to build various 3D model components ranging from vessels to foundations to pipe is included.
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Chapter 13 – Piping Isometrics
Pipe Drafting and Design, 2012Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:Publisher Summary The Piping Isometric is an important drawing that serves several purposes. It is the primary source for material take-off of each pipe configuration in a facility. Material take-off is the process by which each individual component that makes up a pipe configuration is tabulated for purchase or procurement. This means that all Piping components (elbows, flanges, nuts, bolts, washers, gaskets, etc.) must be counted so that purchases of those items can be made. The tabulated results are referred to as the bill of materials. Isometrics also serve as fabrication drawings. Once drawn and properly dimensioned, Isometrics are provided to fabricators who build each Piping configuration. Fabricators will use the completed Isometrics to build shop spools. Shop spools are detailed specifically for pipe welders and fitters with precise cut-lengths and weld symbols. After configurations are fabricated, X-rayed, painted, and shipped to the construction site, Isometric drawings serve as an aid to the construction and erection of the facility by providing workers with the locations of tie-ins, connections, and routings.
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Chapter 13 – Piping Isometrics
Pipe Drafting and Design, 2002Co-Authors: Roy A. Parisher, Robert A. RheaAbstract:Publisher Summary This chapter deals with the explanation of Piping Isometrics. An Isometric is a type of three-dimensional drawing known as a “pictorial.” Isometrics—or “isos” as they are commonly called—are developed using the three primary dimensions of an object: height, width, and depth. Piping Isometric is an important drawing that serves several purposes. It is the primary source for material take-off of each pipe configuration in the facility. Material take-off is the process by which each individual component that makes up a pipe configuration is tabulated for purchase or procurement. To make Piping Isometrics look uniform, most companies use the grid units on the Isometric vellum to establish sizes for fitting, flange, and valve symbols. Isometric symbols drawn with AutoCAD can be developed so that a single orientation of the symbol can be used in any of the Isometric axes. Isometric symbols can be drawn, rotated, and WBLOCKed for repeated use in any drawing at any Isometric angle.
Zhiyong Su - One of the best experts on this subject based on the ideXlab platform.
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A unified framework for authenticating topology integrity of 2D heterogeneous engineering CAD drawings
Multimedia Tools and Applications, 2016Co-Authors: Zhiyong Su, Lang Zhou, Weiqing TangAbstract:This paper presents a novel unified framework for authenticating topology integrity of 2D heterogeneous engineering CAD drawings. Topology information, through which a variety of engineering reports are generated, plays the most important role in the engineering CAD field. However, topology integrity authentication for engineering CAD drawings is still in its infancy and few efforts were made in the literature. By efficiently extracting topological and geometric features regardless of their heterogeneity with respect to geometrical shape and topology representation, the proposed framework supports verifying topology integrity for various heterogeneous engineering CAD drawings, such as process flow diagrams (PFD), Piping and instrument drawings (P&ID), Piping Isometric drawings (ISO) as well as sectional drawings. Topology authentication is achieved through embedding local topological features into geometric features by introducing a generic and effective semi-fragile watermarking scheme. A novel descriptor, called topology local binary patterns (T-LBP), is proposed to extract local topological features of heterogeneous drawings. Theoretical analysis and experiments have demonstrated the discrimination power, robustness and sensitivity of the proposed T-LBP descriptor. We also carry out further experiments to prove that the proposed framework can not only detect and locate malicious topological modifications, but also yield strong robustness against various topology preserving modifications.
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Topology authentication for Piping Isometric drawings
Computer-aided Design, 2015Co-Authors: Zhiyong Su, Weiqing Li, Xin Yang, Weiqing TangAbstract:Piping Isometric drawings, which feature their intrinsical topological relation rather than just geometrical shape, are important industrial art works in the field of Computer-Aided Design (CAD). This paper takes a fresh look at the topology integrity authentication of Piping Isometric drawings, which has not been mentioned before in the literature, from the digital watermarking perspective. A blind and semi-fragile watermarking based algorithm is proposed to address the referred interesting issue. The topology authentication problem of Piping Isometric drawings is investigated. In addition to the stretching operation, both global and local similarity transformation operations, which are critical problems in the case of watermarking embedding and extraction, are analyzed in detail. The topological graph is extracted and constructed from the drawing firstly. Then, similarity transformation invariants are constructed as watermarks carriers for each node. After that, the topological relation among joint components is encoded into singular watermarks for each node of the graph. These generated topology sensitive watermarks are embedded into geometrical invariants of each node via quantization index modulation. Theoretical analysis and experimental results demonstrate that our approach yields a strong ability in detecting and locating unauthorized topology attacks while achieves robustness against both global and local similarity transformations especially the stretching operation. The proposed scheme can be employed to authenticate topology integrity for each of the drawings derived from the model individually in industry practices. The topology authentication problem of Piping Isometric drawings is addressed.A semi-fragile watermarking scheme for the topology authentication is proposed.The proposed scheme is robust against local similarity transformations.The proposed scheme is invariant to the stretching operation on pipes.The proposed scheme provides good tamper localization accuracy.
Tangweiqing - One of the best experts on this subject based on the ideXlab platform.
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Topology authentication for Piping Isometric drawings
Computer-aided Design, 2015Co-Authors: Suzhiyong, Yangxin, Liuguangjie, Liweiqing, TangweiqingAbstract:Piping Isometric drawings, which feature their intrinsical topological relation rather than just geometrical shape, are important industrial art works in the field of Computer-Aided Design (CAD). T...