UTA MAE 1351 Exam 2
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173 Terms
From the textbook 7.02...
Components
the objects that make up a system (assembly).
From the textbook 7.02...
Instances
the copies of a component within the system (assembly).
From the textbook 7.02...
Subassembly
a grouping of components that serves a single purpose within the overall assembly.
From the textbook 7.02... A benefit for using subassemblies and instances.
- improve assembly modeling efficiency and save computer space allowing the software to run smoother.
- subassemblies remove the need to creates instances of individual components, saves computer memory.
From the textbook 7.02... Associativity
when changing the geometry of a part, the component and all instances of it will also change by the same amount (similar to regenerating a part after altering the profile sketch).
From the textbook 7.02...
A benefit of associativity.
- greatly increases the computer's modeling efficiency for complex parts and systems.
From the textbook 7.03...
Hierarchy
the organization or structure of a system (assembly).
- it is similar to an inverted family tree, with the main assembly at the top.
From the textbook 7.03...
Associations between components and subassemblies.
parent-child relationships
- An example from the text would be the handrail being the parent whose children are the horizontal members.
From the textbook 7.03...
An advantage of creating an assembly hierarchy.
- subassemblies can be dealt with as a whole rather than as separate components.
From Module 2.1...
A helpful use of assembly modeling.
- relative motion analysis between parts.
From Module 2.1...
In an assembly, the feature tree in SW includes.
The top level assembly followed by subassemblies and their components and respective subassemblies.
From Module 2.1...
The three basic degrees of freedom.
The X, Y, Z coordinates.
From Module 2.1...
A rigid (solid) body has the 3 degrees of freedom plus 3 more parameters that determine its orientation in space. They are _____ quantities.
Angular
From Module 2.1...
The 6 degrees of freedom.
- Up/Down
- Left/Right
- Forward/Back
- Roll
- Yaw
- Pitch
From Module 2.1...
A part that is completely fixed has ___ degrees of freedom.
Zero.
From Module 2.1...
The process of assembly is the process of.
Removing degrees of freedom from a component from 6 to however many degrees of freedom needed for the component to make sense within the assembly.
From Module 2.1...
Removing degrees of freedom in SW is done by using.
Constraints.
From Module 2.1...
"An assembly cannot be nested inside an existing assembly, only parts can" T/F
False.
From Module 2.1...
"I bring a part into an assembly in SW, and click the OK check mark in the top right, this will..."
Align the component origin with the assembly origin.
From the textbook 7.04...
Base instance
remains stationary with the other instances moving into place around it.
- used to orient instances so they are properly located in space relative to one another.
From the textbook 7.04...
The first step after selecting the base component/instance...
reference planes that are connected to the base instance should be established
- serve as the coordinated plane for the space defined by the system.
From the textbook 7.04...
Assembly Constraints
constraints applied between 2 3-D instances so they maintain dimensional or geometric relationships with respect to one another.
From the textbook 7.04...
Each time a constraint is applied...
One or more degrees of freedom are removed.
From the textbook 7.04...
When are concentric constraints especially useful?
when dealing with cylindrical shafts that fit within a cylindrical hole in another part.
From the textbook 7.04...
Concentric constraint
constraining a centerline to coincide with a centerline of a different instance, forcing them to be concentric.
From the textbook 7.04...
Insert Constraint
a special type of concentric constraint used to insert a fastener into a hole in a different part.
From the textbook 7.04...
Mating Surfaces Constraint
defines 2 surfaces as mating surfaces, meaning they line up on top of each other.
- can only be applied to flat/planar surfaces.
From the textbook 7.04...
A surface normal
a vector that is perpendicular to the surface and points away from it.
From the textbook 7.04...
Mating surfaces constraint in terms of the surface normals
forcing the normals of the 2 surfaces to be parallel.
From the textbook 7.04...
Both ____ and _____ DOFs are removed when Mating surfaces constraints are applied.
rotational and translational
From the textbook 7.04...
Coincident constraint
a coincidence can occur between 2 lines, 2 points or between a line and a point. (corner or edge between instances, most commonly.)
- coincidence of 2 planes is already defined by the Mating Surfaces constraint.
From the textbook 7.04...
When applying a coincident constraint you are typically required to...
input offset distances between points or flip instances to achieve your final desired result.
From the textbook 7.04...
Distance constraints
define the relationship between two instances.
- points, edges and surfaces can be used to define the distance between instances.
From the textbook 7.04...
A mechanism
a predominant type of analysis that you can perform with an assembled model
From the textbook 7.04...
Mechanism analysis can only be accomplished if...
an assembly is properly constrained (not fully, not unconstrained).
From the textbook 7.04...
Assemblies can be ____ constrained, ___constrained, or _____ constrained.
fully, un-, partially
From the textbook 7.04...
Unconstrained systems should be avoided because...
all instances in the assembly are free to move relative to one another.
From the textbook 7.04...
When trying to analyze an unconstrained assembly...
each instance/subassembly would have to be moved one by one.
From the textbook 7.04...
An assembly that is rigid and unable to move is...
fully constrained
From the textbook 7.04...
An ideal system should have just enough constraints to...
define the permissible motion in the assembly.
From Module 2.2...
The number between <#> in the feature tree represents
the number of instances of a part/subassembly in a system
From Module 2.2...
To anchor the first part in an assembly...
click the green checkmark after adding a part, this will force the coordinates of the part to be coincident with the coordinate system of the assembly.
From Module 2.2...
(f) in the feature tree stands for
fixed - has 0 DOFs, cannot move
From Module 2.2...
(-) in the feature tree represents a part/subassembly in the ___ state
float - it has a number of DOFs, some range of motion
From Module 2.2...
Right clicking a mate in the feature tree and clicking "Mate Alignment" will...
flip the axes of the parts to face same/different directions
From Module 2.2...
In an assembly, the mate coincident implies...
colinear, not necessarily taking up the same space (lie along the same line in space).
From Module 2.2...
T/F Constraints must be used on a feature of a part.
F - Constraints work with reference geometry as well.
From Module 2.2...
T/F Dimensional constraints are necessary in an assembly.
F - Geometric constraints work just as well alone.
From Module 2.2...
Examples of advanced mates are...
- profile center
- symmetric
- width
- path mate
- linear/linear coupler
- limit distance
(you probably don't need to know all, but i would remember width and limit distance - shown in the video)
From Module 2.2...
The advanced mate "Width" is useful when
aligning parts, especially when there is a gap.
From Module 2.2...
The advanced mate "Limit Distance" allows you to....
impose a dimensional constraint on an otherwise infinite range of motion (can be applied linear or angular).
From Module 2.2...
Examples of mechanical mates are...
- cam
- slot
- hinge
- gear***
- rack pinion
- screw
- universal joint
From Module 2.2...
The mechanical mate "Gear" allows you to....
select two round surfaces and set a gear ratio between them, you can reverse the direction and change the gear ratio at any time.
From Module 2.2...
I bring a cube into an assembly & mate coincident one of its edges to a fixed edge, it now has these many DOFs.
2 DOF
From Module 2.2...
I bring a cube into an assembly & mate coincident one of its vertices to a fixed vertex, it now has these many DOFs.
3 DOF
From Module 2.2...
For every mate I apply, I reduce the DOF of the part by ___ many.
Depends on the mate
From Module 2.2...
I bring a cylinder into an assembly & mate parallel one of it's flat surfaces to the top plane. This causes it to lose this many DOFs.
2 DOF
From Module 2.2...
I bring a cylinder into an assembly & mate tangent it's curved surface to the curved surface of a fixed identical cylinder. It now has this many DOFs.
3 DOF
From the textbook 8.05...
The physical properties of a part can be computed about any set of axes - the ___, the _____, or some other set of _____ axes.
global, local, user-defined.
From the textbook 8.05...
To increase a device's stability, you may need to know where a system's ____ is.
center-of-mass
From the textbook 8.05...
Inertial properties such as, _____, ______, ______, and _______ can be calculated from models.
- radii-of-gyration
- moments of inertia
- principal axes of rotation
- products of inertia
From the textbook 8.05...
The command "Measure Point"...
returns the coordinates (x, y, and z) of a specific point on a sketch or model.
- Usually, this point has to be a pickable point, such as a corner or circle center. You could, however, interpolate between two pickable points to return the coordinates of a point that is halfway between two defined points.
From the textbook 8.05...
The command "Measure Line Length"...
returns the length of a line.
- does not have to be a specific edge on the model.
From the textbook 8.05...
The command "Measure Line Distance"...
returns the shortest (perpendicular) distance between a line and another identified entity, such as a point.
From the textbook 8.05...
The command "Measure Circle"....
returns the center & diameter of a circle, such as a hole diameter.
From the textbook 8.05...
The command "Measure Arc"...
returns the center & radius of an arc.
From the textbook 8.05...
The command "Measure Surface"...
returns the area of a specified surface and the length of the perimeter surrounding that surface.
From the textbook 8.05...
Mass properties depend on two things:
- the geometry of a part
- the density of the part (mass per unit volume)
From the textbook 8.05...
In mass properties, "Mass" is...
the measure of the body's property to resist change in it's steady motion.
- depends on volume and density.
From the textbook 8.05...
In mass properties, the "Center-of-Mass" is...
the origin of coordinate axes for which first moments are zero.
- considered the center of a volume.
From the textbook 8.05...
In mass properties, "Principal Axes of Inertia" are...
extreme moments of inertia for a body, they are associated with principal axes of inertia that have their origin at the COM.
- The direction of each is usually given by the 3 unit vector components.
From the textbook 8.05...
In mass properties, "Moments of Inertia" are...
the second moment of mass of a body relative to an axis.
- It is a measure of the body's property to resist change in its steady rotation about the axis. Depends of the body's mass and its distribution around the axis.
From the textbook 8.05...
If the moment of inertia is large, a wheel will require a _______ to accelerate to a desired rotation rate.
Higher torque, the opposite is also true.
From the textbook 7.06...
The amount that two instances overlap is referred to as the ______ between them.
Interference
From the textbook 7.06...
A way to adjust interference is....
changing the size of features as appropriate to remove interference or increase clearances.
From the textbook 7.06...
T/F The most practical way to check for interference is to check between all parts.
F - Select which parts to check
From the textbook 7.06...
T/F Two instances can have both interference and clearance at the same time.
F - only one of the two is possible, seeing as they are opposite.
From the textbook 7.06...
A common place to check for interference and clearances would be...
between shafts and circular holes.
From Module 2.3...
Using Visualization in SW, you can show shadows, reflections, colors, and textures to gain levels of _______.
Photorealism
From Module 2.3...
Using Visualization in SW, you can create _____ assemblies that are also photorealistic.
exploded
From Module 2.3...
________ allow people to download and view your 3-D models without having to download the entire CAD system. The SW equivalent to this is _____.
Portable viewers, E-Drawings
From Module 2.3...
Evaluate --> Measure (various things that this tool does)
- Clicking on a face, you get surface area and perimeter.
- You can combine and measure two features.
- If two points are not aligned in the x, y, and z axes, Measure will break down distances in those axes for you and give you the overall distance.
- Distance between circles, you can change where from (center, min/max, and a custom distance).
- Change the units you measure in
- SW keeps a history of your measurements.
From Module 2.3...
Evaluate --> Mass Properties (various things that this tool does)
- Can be calculated for the assembly or individual components
- Can obtain the COM, which becomes a feature
- You get mass and volume with customizable units.
- You can get the principle axes of inertia and moments of inertia.
- You can change coordinate plane by creating a coordinate system using reference geometry. (changes where the COM is relative to whatever origin you have created, it will not physically move.
From Module 2.3...
Evaluate --> Interference Detection (various things that this tool does)
- Can select components to check or do the entire assembly.
- SW will show where the interferences are and will rank them by severity.
From Module 2.3...
Evaluate --> Clearance Verification (various things that this tool does)
- measure distances between parts
From Module 2.3...
The equivalent of mass in a rotational system is called the...
Moment of Inertia
From Module 2.3...
I have an assembly with moving parts and wish to check that I have part clearances throughout for this I need...
Motion Study
From Module 2.4...
Animation better communicates...
the capabilities of the part.
From Module 2.4...
From Motion Study, you can choose ______ or _____ other dynamics would require using the SW add-ins.
animation, basic motion
From Module 2.4...
Animations works in the principles of ____ and ____ ______.
keys and key frames.
From Module 2.4...
In Motion Study, you can add _____ to gain autonomous motion.
motors
From Module 2.4...
You can check interferences in Motion Study, this is useful because...
the system provides a list of interferences and indications of where and when they happen.
From Module 2.4...
In order to use Rigid Body Dynamics _____ must be turned on along with Motion Study in SW.
Motion Analysis SW Add-On
From Module 2.4...
Within Motion Analysis in SW, clicking plots and a specific component will allow you to create...
A plotted analysis of the motion/force of a specific part.
From Module 2.4...
Applying a contact condition between two parts within Motion Study will...
remove interference between the two parts (will not be allowed to interfere).
From Module 2.4...
T/F When applying a force within Motion Study, the force must be constant throughout the whole motion.
F - can change it's function so it is not constant all throughout the application.
From Module 2.4...
In a SW assembly it is possible to assign an arbitrary motion to a component - for ex: sinusoidal - to visualize it's overall behavior. True?
Yes, easily.
From the textbook 8.06...
Finite Element Analysis (FEA) is...
an advanced design analysis technique that has been made possible through the development of sophisticated 3-D CAD solid modeling tools.
From the textbook 8.06...
Mesh
the small pieces the part is divided into when using FEA.
From the textbook 8.06...
The governing differential equation can be easily solved for each of the individual pieces within the mesh, these pieces are called...
Elements
