Óbuda University John von Neumann Faculty of Informatics

Óbuda University John von Neumann Faculty of Informatics Institute of Applied Mathematics Master in Mechatronics Course Modeling and Simulation 4. 1 Definition and simulation of form features in model of solid represented part Lecture and laboratory (MS 4. 1) on the same thematic example model László Horváth http: //nik. uni-obuda. hu/lhorvath/

This presentation is intellectual property. It is available only for students in my courses. The screen shots in tis presentation was made in the CATIA V 5 and V 6 PLM systems the Laboratory of Intelligent Engineering systems, in real modeling process. The CATIA V 5 és V 6 PLM systems operate in the above laboratory by the help of Dassult Systémes Inc. and CAD-Terv Ltd. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Contents Modification of base feature consisting of several topological lumps Definition of pocket volume subtracting feature Definition of rib volume adding form feature Definition of slot volume subtracting form feature Definition of fillet conditioning form feature Definition of tabulated solid form feature for the modification of several lumps Form feature in contextual pattern Definition of draft conditioning form feature Active and inactive form features Definition of finite element model (FEM) entities on boundary Finite element analysis on solid for part László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Modification of base feature consisting of several topological lumps The tabulated solid feature Pad. 1 is defined in the context of a closed contour which consists of four closed contour components. The result is a solid which topologically consists of four tabulated solid lumps. This is the base feature. László Horváth UÓ-JNFI-IAM The Pocket. 1 is a pocket volume subtracting feature which is defined using the rule of tabulation. It is defined in the context of the Spline. 1 closed curve which is defined in a plane on the boundary of the base feature (”on site”). http: //users. nik. uni-obuda. hu/lhorvath/

Definition of pocket volume subtracting feature The Pocket. 1 is a pocket volume subtracting feature which is defined using the rule of tabulation. It is defined in the context of the Spline. 1 closed curve which is defined in a plane on the boundary of the base feature (”on site”). László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of rib volume adding form feature The Rib. 1 rib volume adding form feature is defined in the context of section (Sketch 5) and center line (3 DCurve. 1) entities. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of rib volume adding form feature László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of slot volume subtracting form feature The Slot. 1 rib volume subtracting form feature is defined in the context of circle section and center line (3 DCurve. 2) entities. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of slot volume subtracting form feature László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of fillet conditioning form feature The edge fillets (Edge. Fillet 1 -5) are constant radius fillet form features. They are defined on edges in the topological structure and have first order continuity at connection of the new surfaces and the formerly generated surfaces in the boundary. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of tabulated solid form feature for the modification at several lumps The Pad. 2 tabulated volume adding form feature modifies four lumps by „on site” definition of its closed contour. Really, lumps were formerly integrated in a common shell by the rib form feature. Boundary is extended at four place where the lumps were originally defined. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of variable radius fillet conditioning form feature The Edge. Fillet. 6 variable radius fillet conditioning form feature is defined on a topological edge in the context of five radius values at five discrete points along the edge. In accordance with the parameter value specification, the result is a cubic surface. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Form feature in contextual pattern László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of draft conditioning form feature László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Active and inactive form features László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Definition of finite element model (FEM) entities on boundary László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Finite element analysis on solid for part László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

4. 2 Definition and simulation of functional form features László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

About functional features Functional goals and design constraints are focused. Geometry is derived through behavioral features. Volumes and features contain inherent behaviors and interact. How different behaviors of functional features interact together to produce the final shape? Relevant shape modeling methodologies apply and supposed to know (see previous lectures in this course). László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Functional shape model entities Body and solid functional set. Functional Feature It is inserted in a solid functional set. Characterized by inherent behaviors. Solid Functional Set Includes functional features. Multiple and nested functional sets organize the functional specifications. The solid functional set is the resulting shape of the functional specifications it contains. Curves and surfaces are included in functional sets. Shell and draft Properties Solid functional set may include shell and draft property features. They specify the thickness of the walls and mold process properties globally for the solid functional set and areas of the shape, respectively. Centralized way of modifications. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Functional features Special behaviors and considerations apply. Features represent material and empty spaces. Inherent: no history dependence applies (before of after creating of feature). Inherent behavior of existing inside or outside of a material feature within the same body. Features are defined by how they interact with another feature. Functional behaviors: shellable, protected, internal, external, added, core. Volume type is defined according to the required results. Depending on the type, function of a feature is add or subtract material as well as increase decrease or protect a spatial volume. Fitting shape into another shape Shape is fit into another shape in a different solid functional set. Protected area is defined. It is applied to take into account the space that will be occupied by shape in the same mechanism. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Functional features Features with inherent behaviors and specific design intents that are applied to other features to modify them. Each functional feature performs a function, such as creating walls, adding material to the inside or outside of a shape feature, or creating and protecting an empty space. Retain behavior. For example, pocket has an inner protected volume, which means that no other volumes in the same body can penetrate this area. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Basic functional features Added Feature Adds material to both the outside and inside of material volumes that it intersects within the same body. Shellable Feature Added volume and inherits the shell properties of the body. Protected Feature Material cannot penetrate the protected volume. Protected feature reserves space for another features or for volumes that must be kept open. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Basic functional features Core Feature A spatial volume replaces material volume only where the core feature intersects with the shellable or external feature within the same body. Interconnected core: Offset of the union of all shellable features contained within the same solid functional set. Isolated core: Offset of only shellable features geometry. Cutout Removes material and creates a protected volume. The cutout is shelled as you apply it to a shellable feature. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Basic functional features Internal feature Adds material only to the inside of the shellable and core feature that it intersects within the same body. Shellable properties are not inherited. External feature Adds material to the outside of another material volume that it intersects within the same body. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

Functional features Reinforcements The material is added to the outside of material volumes that it intersects. Rib Adds strength to a shelled body and is typically applied inside a shelled body. László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

MS 4. 2 laboratory exercise Functional model of shape László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/

MS 4. 2 laboratory exercise László Horváth UÓ-JNFI-IAM http: //users. nik. uni-obuda. hu/lhorvath/