Course Introduction to virtual engineering

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/


1

2

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

l1'

A1

A2

l1

l2

A1

A2

l3

l2 '

A1

A2

l3


Adding relative movements to solid shapes at relationships

C1

C2 C3

R3

R1

R2 R4

C4

Structure of mechanismC – jointR – rodRv – frame

Rv=R1

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

Ball

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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