Course Introduction to virtual engineering

Óbuda UniversityJohn von Neumann Faculty of Informatics

Institute of Applied Mathematics

Lecture and laboratory 5.

Positioning and moving related shapes

László Horváth university professor

http://users.nik.uni-obuda.hu/lhorvath/

Contents

Keeping constraints at modification of related solid shapes

Creating mechanisms by adding relative movements to solid shapes

Positional relationships of solid shapes in model space

Lecture

Placing and modification of relationships at connection of components (VE5.1)

Laboratory

Definition of mechanism and simulation of kinematics (VE5.2)

László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/

Under and over defined constraining are to be avoided.

Required and sufficient number of relationships (constraints).

Examples for relationships (constraints)

Reference plane

Coincidence

AngleContact Distance

Change positional relationship

Definition of Part3 in the context of placed Part1 and Part2

Definition mechanism

Modified offset parameter value needs modified Part3

Syncronize then update the contextual Part3

Kinematics simulation of the modified mechanism

Analysis results for placing constraints and mechanism

Keeping constraints at modification of related solid shapes

Adding relative movements to solid shapes at relationships

Structure of mechanismC – jointR – rodRv – frame

Base featureBoundaryrepresentation

Shape modifications

Placing of parts

Allowed movements (DOFs)

Adding relative movements to solid shapes at relationships

1 translation

Translational

1 rotation + 1 translation

Cylindrical

2 rotations

Universal

3 rotations

Joint type

Degrees of freedom (DOFs)

1 rotation

Rotational

Relationships and kinematics of boundary represented feature driven solids

Laboratory tasks VE5.1 and VE5.2

Parts to be placed: Part1

Part1 and part2 in the placing space

Placing Part1 and Part2

Result of part placing

Definition of kinematics

Kinematics definition result

Basic simulation of mechanism

Course Introduction to virtual engineering

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