MAE 1351 Exam 2 UTA

assembly constraints:

Used to establish relationships between instances in the development of a flexible assembly model.

associativity

The situation whereby parts can be modified and the components referenced to the parts will be modified accordingly.

base instance:

The one fixed instance within an assembly.

bill of materials:

A tabular list of the components, with quantities of each for the parts, that make up an assembly.

bottom-up modeling:

The process of creating individual parts and then creating an assembly from them.

clearances:

The minimum distances between two instances in an assembly.

exploded configuration:

A configuration of an assembly that shows instances separated from one another. An exploded configuration is used as the basis for an assembly drawing.

components:

References of object geometry used in assembly models.

hierarchy:

The parent-child relationships between instances in an assembly.

instances:

Copies of components that are included within an assembly model. interference: The amount of overlap between two instances in an assembly.

subassembly:

A logical grouping of assembly instances that is treated as a single entity within the overall assembly model.

top-down modeling:

The process of establishing the assembly and hierarchy before individual components are created.

fishbone diagram:

A diagram that shows the various subsystems in a device and the parts that make up each subsystem

analysis:

The study of the behavior of a physical system under certain imposed conditions

laser scanning

(three-dimensional): A process where cameras and lasers are used to digitize an object based on the principle of triangulation.

black box diagram:

: A diagram that shows the major inputs and outputs from a system.

mass:

A property of an object's ability to resist a change in acceleration.

boundary conditions: T

The constraints and loads added to the boundaries of a finite element model.

mechanical dissection:

The process of taking apart a device to determine the function of each part.

mechanical stress:

Developed force applied per unit area that tries to deform an object.

caliper: A

A handheld device used to measure objects with a fair degree of accuracy

center-of-mass (centroid)

): The origin of the coordinate axes for which the first moments are zero.

mesh:

The series of elements and nodal points on a finite element model

constraint:

: A boundary condition applied to a finite element model to prevent it from moving through space.

metrology:

The practice of measuring parts.

. coordinate measuring machine:

A computer-based tool used to digitize object geometry for direct input to a 3-D CAD system.

moment-of-inertia:

The measure of an object's ability to resist rotational acceleration about an axis.

radius-of-gyration:

The distance from an axis where all of the mass can be concentrated and still produce the same moment-of-inertia.

density: T

: The mass per unit volume for a given material.

displacement:

A change in the location of points on an object after it has been subjected to external loads.

reverse engineering:

A systematic methodology for analyzing the design of an existing device.

engineering scale:

: A device used to make measurements in much the same way a ruler is used.

surface area:

The total area of the surfaces that bound an object.

Finite Element Analysis:

An advanced computerbased design analysis technique that involves subdividing an object into several small elements to determine stresses, displacements, pressure fields, thermal distributions, or electromagnetic fields.

volume:

The quantity of space enclosed within an object's boundary surfaces.