Computer Aided Exam 1

Chapters 1-4

CAD

Digital creation and modification of product geometry and engineering documentation

CAM

Use of computer systems for process planning, tool-path generation, and machine control

Design Intent

Information describing how geometry should update when requirements change.

Parametric Modeling

Modeling approach using parameters and relationships to control geometry.

Feature-Based Modeling

Creating models using engineering features rather than raw geometry.

Digital Product Model

Digital representation containing product geometry and design information.

Process Planning

Determining how a product will be manufactured

Tool-Path Generation

Creation of machine tool motion paths

Machine-Control Information

Instructions used by manufacturing equipment.

Engineering Documentation

Drawings and related design records

Associativity

Automatic updating of related model elements when changes occur.

BOM (Bill of Materials)

Structured list of parts and materials in a product.

GD&T

Geometric Dimensioning and Tolerancing system used on engineering drawings.

Postprocessor

Software that converts tool paths into machine-specific NC code.

Feeds and Speeds

Cutting parameters controlling machining performance.

CAE

Computer-Aided Engineering used for analysis such as stress and thermal studies.

CAPP

Computer-Aided Process Planning used to determine operation sequence and resources.

CAI

Computer-Aided Inspection used for measurement and quality verification.

CMM

Coordinate Measuring Machine used for inspection

Digital Thread

Continuous flow of product and process information throughout the lifecycle.

Digital Twin

Digital representation connected to data from a physical product or process.

Smart Manufacturing

Manufacturing using connected digital technologies and data.

Manufacturability

Ability of a design to be efficiently manufactured.

Lifecycle Consistency

Maintaining accurate and connected information throughout a product's life.

Revision Control

Management of engineering changes and model versions.

Data Exchange

Transfer of engineering information between systems

Solid Model

Complete, unique, and unambiguous representation of an object.

Geometric Modeling

Mathematical representation and visualization of geometry in a digital system

Face

Surface that bounds a solid model.

Edge

Boundary where two faces meet

Vertex

Point where edges meet.

Primitive Approach

Modeling method using basic geometric solids.

Features Approach

Modeling method using engineering features such as holes.

Sketching Approach

Modeling method based on sketches and operations such as extrusion

Boolean Operations

Mathematical operations combining or modifying solids

Loft

Creating geometry by blending between profiles.

Helix

Spiral-shaped curve.

Analytic Curves

Curves described using mathematical equations

Synthetic Curves

Curves generated using control points and geometric algorithms.

Point

Zero-dimensional geometric entity.

Fillet

Rounded transition between surfaces or edges.

Chamfer

Angled edge replacing a sharp corner.

Conic Curve

Curve created by intersecting a plane with a cone.

Implicit Equation

Equation written in the form F(x,y,z)=0

Explicit Equation

Equation directly expressing one variable in terms of others

Parameter (u)

Local coordinate identifying position on a curve.

Position Vector P(u)

Vector locating a point on a curve

Tangent Vector

Vector describing direction of a curve at a point

Bezier Curve

Synthetic curve defined by control points and Bernstein polynomials

Control Point

Point used to influence shape of a curve.

Multiplicity

Repetition of a control point to modify curve behavior

B-Spline Curve

Generalized form of Bezier curve with local control

Nonperiodic B-Spline

Open B-spline curve

Open B-Spline

B-spline that passes through beginning and ending control points.

Curve Degree

Polynomial degree of a curve. For B-splines, degree = k−1

B-Spline Function Nᵢ,ₖ(u)

Basis function used to define a B-spline curve

Hermite Cubic Spline

Cubic spline using position and tangent information at endpoints.

Cubic Spline

Piecewise cubic curve with continuity conditions

Curvature Continuity (C² Continuity)

Continuity of curvature between adjacent curve segments.

Interpolation

Curve passing through specified control points.

Convex Hull Property

Bezier curve remains inside the convex hull of its control points