Implementation of methods and algorithms for geometric and structural modeling in the problems of parametric design of a ship's hull structure

2021 ◽  
pp. 159-170
Author(s):  
С.Н. Рюмин ◽  
В.Н. Тряскин
Keyword(s):  
Computer Aided Design ◽  
Parametric Design ◽  
General Structure ◽  
Three Dimensional ◽  
Structural Modeling ◽  
Ship Structures ◽  
Common Structure ◽  
Hull Structure ◽  
Computer Aided ◽  
Aided Design

В работе рассмотрены методология и алгоритмы геометрического и конструктивного моделирования судовых конструкций специализированного программного обеспечения и автоматизированных систем для проектирования конструкции корпуса судна в соответствии с требованиями Правил Российского морского Регистра судоходства и Гармонизированных общих Правил МАКО. Даны понятия геометрического и конструктивного моделирования. Показано место геометрического и конструктивного моделирования в общей структуре системы автоматизированного проектирования судовых конструкций, рассмотрены основы моделирования конструкций в виде плоского конструктивного сечения и трехмерного перекрытия. Описаны возможности специального программного обеспечения – редакторов геометрической и конструктивной модели. Рассмотрена структура специализированного геометрического ядра автоматизированной системы. Приведены примеры использования предлагаемых методов и алгоритмов в разработанном авторами программном обеспечении автоматизированных систем, обоснованы преимущества предлагаемых методов по сравнению с ранее известными решениями. The paper considers the methodology and algorithms for geometric and structural modeling of ship structures, which are used in specialized software of computer-aided systems for the design of the ship's hull structure in accordance with the requirements of the Russian maritime register of Shipping Rules and the IACS Harmonized Common Structure Rules. The concepts of geometric and constructive modeling are given. The place of geometric and structural modeling in the general structure of the computer-aided design of ship structures is shown, the basics of modeling structures in the form of a flat structural section and three-dimensional grillage are considered. The possibilities of special software - editors of geometric and structural models are described. The structure of a specialized geometric kernel of the computer-aided system is considered. Examples of using the proposed methods and algorithms in the developed by authors software of computer-aided systems are given, the advantages of the proposed methods are substantiated in comparison with previously known solutions.

scholarly journals Methods of integrated computer-aided design of structural elements of the aircraft

2015 ◽  
pp. 92-98
Author(s):  
Деніс Миколайович Данилюк ◽  
Геyнадій Анатолійович Вірченко
Keyword(s):  
Computer Aided Design ◽  
Parametric Design ◽  
Three Dimensional ◽  
Integrated Design ◽  
Longitudinal Force ◽  
Structural Elements ◽  
Method Of Calculation ◽  
Computer Aided ◽  
Force Element ◽  
Aided Design

Previously applied methods of designing aircraft based on two-dimensional geometric models that made it impossible to take into account all the necessary design and technological features. It was a prerequisite for the development of an integrated methodology that includes design and computer simulation of three-dimensional parametric design of the aircraft as a whole and its individual parts [2-5]. In this paper, the method of computer-aided design stringer at the master model geometry and space allocation wing aircraft.In article approaches to integrated computer-aided design. These types of problems preliminary design and the method of calculation of typical aircraft structural elements for example longitudinal force element sets as stringer. Also, the algorithm constructs a fully stringer system aided design of integrated Siemens NX. What can shorten the design time and use it as a reference for the calculation and further change just values for other dimensions stringers.Methods integrated design ensure the application of standard parametric analytical stringers in the calculation of aerodynamics and strength, life and vitality, weight of the aircraft and its alignment, safety of structures, as well as technological preparation of production and quality control, maintenance and repair.Considered aided design techniques can be extended to other than the stringers typical elements airframe.

Application of CAD Secondary Development Technology in the 3D Parametric Design of Mechanical Parts

2012 ◽  
Vol 246-247 ◽  
pp. 1251-1254
Author(s):  
Ming Lu
Keyword(s):  
Graphic Design ◽  
Computer Aided Design ◽  
Parametric Design ◽  
Mechanical Design ◽  
Three Dimensional ◽  
Secondary Development ◽  
Mechanical Parts ◽  
Computer Aided ◽  
Development Technology ◽  
Aided Design

This paper mainly studies the technology of computer aided design in mechanical design application. In the three-dimensional spring parametrization design as an example, introduced the use of AutoCAD embedded Visual LISP development tools for3D parametric graphic design principles, processes and methods, introduction of computer aided design technology, reduces the design personnel repetitive drawing work, improve the efficiency of design.

scholarly journals Automatized Evaluation of Students’ CAD Models

2021 ◽  
Vol 11 (4) ◽  
pp. 145
Author(s):  
Nenad Bojcetic ◽  
Filip Valjak ◽  
Dragan Zezelj ◽  
Tomislav Martinec
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Application ◽  
Test Cases ◽  
Cad Model ◽  
Computer Solution ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

The article describes an attempt to address the automatized evaluation of student three-dimensional (3D) computer-aided design (CAD) models. The driving idea was conceptualized under the restraints of the COVID pandemic, driven by the problem of evaluating a large number of student 3D CAD models. The described computer solution can be implemented using any CAD computer application that supports customization. Test cases showed that the proposed solution was valid and could be used to evaluate many students’ 3D CAD models. The computer solution can also be used to help students to better understand how to create a 3D CAD model, thereby complying with the requirements of particular teachers.

Determination of the Workspace of a Three-Degrees-of-Freedom Parallel Manipulator Using a Three-Dimensional Computer-Aided-Design Software Package and the Concept of Virtual Chains1

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Andrew Johnson ◽  
Xianwen Kong ◽  
James Ritchie
Keyword(s):  
Computer Aided Design ◽  
Parallel Manipulator ◽  
Degrees Of Freedom ◽  
Graphical Representation ◽  
Three Dimensional ◽  
Parallel Manipulators ◽  
Workspace Analysis ◽  
Computer Aided ◽  
Aided Design

The determination of workspace is an essential step in the development of parallel manipulators. By extending the virtual-chain (VC) approach to the type synthesis of parallel manipulators, this technical brief proposes a VC approach to the workspace analysis of parallel manipulators. This method is first outlined before being illustrated by the production of a three-dimensional (3D) computer-aided-design (CAD) model of a 3-RPS parallel manipulator and evaluating it for the workspace of the manipulator. Here, R, P and S denote revolute, prismatic and spherical joints respectively. The VC represents the motion capability of moving platform of a manipulator and is shown to be very useful in the production of a graphical representation of the workspace. Using this approach, the link interferences and certain transmission indices can be easily taken into consideration in determining the workspace of a parallel manipulator.

scholarly journals Development of integrated intelligent computer-aided design system for mechanical power-transmitting mechanism design

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401771038 ◽  
Author(s):  
Isad Saric ◽  
Adil Muminovic ◽  
Mirsad Colic ◽  
Senad Rahimic
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Mechanical Power ◽  
Design System ◽  
Computer Aided ◽  
Aided Design ◽  
Intelligent Computer

This article presents architecture of integrated intelligent computer-aided design system for designing mechanical power-transmitting mechanisms (IICADkmps). The system has been developed in C# program environment with the aim of automatising the design process. This article presents a modern, automated approach to design. Developed kmps modules for calculation of geometrical and design characteristics of mechanical power-transmitting mechanisms are described. Three-dimensional geometrical parameter modelling of mechanical power-transmitting mechanisms was performed in the computer-aided design/computer-aided manufacturing/computer-aided engineering system CATIA V5. The connection between kmps calculation modules and CATIA V5 modelling system was established through initial three-dimensional models – templates. The outputs from the developed IICADkmps system generated final three-dimensional virtual models of mechanical power-transmitting mechanisms. Testing of the developed IICADkmps system was performed on friction, belt, cogged (spur and bevel gears) and chain transmitting mechanisms. Also, connection of the developed IICADkmps system with a device for rapid prototyping and computer numerical control machines was made for the purpose of additional testing and verification of practical use. Physical prototypes of designed characteristic elements of mechanical power-transmitting mechanisms were manufactured. The selected test three-dimensional virtual prototypes, obtained as an output from the developed IICADkmps system, were manufactured on the device for rapid prototyping (three-dimensional colour printer Spectrum Z510) and computer numerical control machines. Finally, at the end of the article, conclusions and suggested possible directions of further research, based on theoretical and practical research results, are presented.

Recognising Facial Surfaces

Perception ◽  
1991 ◽  
Vol 20 (6) ◽  
pp. 755-769 ◽  
Author(s):  
Vicki Bruce ◽  
Patrick Healey ◽  
Mike Burton ◽  
Tony Doyle ◽  
Anne Coombes ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Head Model ◽  
Matching Accuracy ◽  
The People ◽  
Computer Aided ◽  
Closed Head ◽  
The Face ◽  
Aided Design ◽  
Dimensional Surface

The extent to which faces depicted as surfaces devoid of pigmentation and with minimal texture cues (‘head models’) could be matched with photographs (when unfamiliar) and identified (when familiar) was examined in three experiments. The head models were obtained by scanning the three-dimensional surface of the face with a laser, and by displaying the surface measured in this way by using standard computer-aided design techniques. Performance in all tasks was above chance but far from ceiling. Experiment 1 showed that matching of unfamiliar head models with photographs was affected by the resolution with which the surface was displayed, suggesting that subjects based their decisions, at least in part, on three-dimensional surface structure. Matching accuracy was also affected by other factors to do with the viewpoints shown in the head models and test photographs, and the type of lighting used to portray the head model. In experiment 2 further evidence for the importance of the nature of the illumination used was obtained, and it was found that the addition of a hairstyle (not that of the target face) did not facilitate matching. In experiment 3 identification of the head models by colleagues of the people shown was compared with identification of photographs where the hair was concealed and eyes were closed. Head models were identified less well than these photographs, suggesting that the difficulties in their recognition are not solely due to the lack of hair. Women's heads were disproportionately difficult to recognise from the head models. The results are discussed in terms of their implications for the use of such three-dimensional head models in forensic and surgical applications.

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