ME 9 Midterm

Model-based definition (MBD)

an approach to creating solid models that contain all the data needed to define a product

Solid modeling

a computer-based simulation that provides a visual display of an object as if it existed in three dimensions

Sketching

a quickly executed freehand drawing that’s made with using drawing instruments

Conceptual Design

generate as many concepts as possible

Isometric pictorial sketch

a type of parallel projection that represents all three dimensions in a single image

Oblique pictorial sketch

the front face of an object is shown flat

Spatial visualization ability

the ability to mentally manipulate 2-D and 3-D images

Cross-section

intersection between solid object and cutting plane

Combining solids

result of two objects joined

Design

a goal-oriented, problem-solving activity

Engineering design

the process of devising a system, component or process to meet desired needs

Decision-making process

which the basic sciences, mathematics and engineering sciences are applied to convert resources optimally to meet a stated objective

An “open-ended” problem

has many possible solutions – the task is to identify all these solutions and then select and develop the best one

Original design

development of a process, assembly or component not previously in existence

Redesign

modification of an existing product or process to meet new requirements

Recognition of Need

needs associated with products for which a market could develop

Problem definition

clarify project objectives, establish functions and set design specifications

Function

describes what the product must do

Conceptualization

generate as many concepts as possible

Brainstorming

most common form of group ideation and concept generation

Brainwriting (6-3-5 method)

generates a list of concepts

Morphological chart method

to generate overall design concepts based on various combinations of sub-function ideas

Concept selection

to determine which concept has the greatest potential for meeting all requirements and becoming a quality product

Embodiment design

a conceptual solution is developed into a detailed layout, including component shapes, dimensions, materials, and manufacturing processes

Detail drawing

a drawing that contains all information necessary for fabrication, finish, marking and inspection of a component

Exploded assembly drawing

depicts an assembly with parts exploded along center lines showing assembly/disassembly relationships

Design verification

reassurance that the design is correct and doing the right thing

Prototyping

the process of generating a working model

Virtual prototyping

computer-aided design (CAD) and computer-aided engineering (CAE) software is used to validate a design before committing to making a physical prototype

Tradeoffs and constraints

engineers must weigh competing factors such as cost, function, and environmental impact

SolidWorks

a 3D Solid Modeling CAD package used to create simple and complex parts, assemblies and drawings

Features

the distinctive geometric shapes that form the part

Base feature

the first created feature that is created

Protrusion

a specific type of extrusion that adds a new feature to an existing 3D solid

Chamfer

an angled cut to remove sharp corners

Fillet

internal corner

Round

external corner

Parameter

the attribute of features that can be modified

Boss-extrude

a fundamental feature that creates a new solid body by extending a 2D sketch into 3D

Revolved boss

a 3D feature created by rotating a 2D sketch around a defined centerline or axis

Boss feature

a method for adding material to a part, creating a raised or protruding area on a component

Cut feature

removes material

Modifying features

the process of changing the definition, parameters, or dimensions

Mirroring

creating a symmetrical copy of a part, feature, face, or assembly component

Mirroring sketch

copies individual sketch geometry within the sketch

Design intent

the intellectual arrangements of features and dimensions of a design

Profile

a planar sketch that is used to create a solid

Co-radial

a sketch constraint that forces two or more arcs or circles to share the same center point and have the same radius

Blind

extends that feature from the sketch plane for a specified distance

Up to next

extends that feature from the sketch plane to the next surface that intercepts the entire profile

Through all

extends the feature from the sketch plane through all existing geometry

Through all - both

extends the feature from the sketch plan through all existing geometry for Direction 1 and Direction 2

Up to vertex

extends the feature from the sketch plane to a plane that is parallel to the sketch plane and passing through the specified vertex

Up to surface

extends the feature from the sketch plane to the selected surface

Offset from surface

extends the feature from the sketch plane to a specified distance from the selected surface

Mid plane

extends the feature from the sketch plane equally in both directions

Up to body

extends the feature up to the selected body

Revolved feature

add or remove material by revolving one or more profiles around a centerline

Sweep feature

creates a base, boss, cut, or surface by moving a profile along a path

Shell feature

creates thin-walled, hollowed-out parts from solid bodies

Pattern feature

enable rapid replication of features

Loft feature

creates a feature by making transitions between profiles