2.2.2 Modifying Part Properties
Each moving part in ADAMS/View can have the following properties in addition to having geometry:
Location and name
Mass and inertia
Initial velocities
Initial location and orientation
ADAMS/View automatically calculates the total mass of the part and its inertia based on the part’s volume and density. It also automatically calculates the initial velocity and position for the part based on any other initial conditions and connections in your model.
2.3 About Constraining Your Model
After you’ve created the parts for your model, you need to define how they are attached to one another and how they move relative to each other. You use constraints to specify part attachments and movement. This section explains the different types of constraints and how to add them to your model.
2.3.1 Types of Constraints
Constraints define how parts (rigid bodies, flexible bodies, and point masses) are attached to one another and how they are allowed to move relative to each other. Constraints restrict relative movement between parts and represent idealized connections.
ADAMS/View provides a library of constraints including:
Idealized joints - Have a physical counterpart, such as a revolute (hinge) or translational (sliding dovetail) joint.
Joint primitives - Place a restriction on relative motion, such as the restriction that one part must always move parallel to another part.
Motions generators - Drive your model.
Higher-pair constraints
2.3.2 Accessing the Constraint Creation Tools
You can create constraints using the tools on the Joint palette or the tools on the Joint and Motion tool stacks on the Main toolbox. The palette contains the entire library of constraints while the tool stacks contain only subsets of the most commonly used constraints. The palette and tool stacks for creating constraints are shown in figure 2.3.
Figure 2.3 Constraint Palette and Tool Stacks
To display the Joint palette:
From the Build menu, select Joints.
To display the contents of the Joint or Motion tool stack:
From the Main toolbox, right-click the Joint or Motion tool stack.
By default, the Revolute tool
appears at the top of the Joint tool stack and the Rotational
Motion tool
appears at the top of the Motion tool stack.
2.3.3 Working with Joints
Idealized joints are mathematical representations of joints that have physical counterparts, such as a revolute (hinge) or translational joint (sliding dovetail). ADAMS/View provides a variety of idealized joints from which you can choose. The next sections explain the different types of joints and how to create and modify them.
2.3.3.1 Working with Idealized Joints
Idealized joints connect two parts. The parts can be rigid bodies, flexible bodies, or point masses. You can place idealized joints anywhere in your model. ADAMS/View supports two types of idealized joints: simple and complex.
Simple joints directly connect bodies and include the following:
Table1 2.3 Simple joints in adams/View
Icon |
Idealized Joints |
An example |
DOF |
|
Translational |
Revolute |
|||
|
Revolute Joints |
|
3 |
2 |
|
Translational Joints |
|
2 |
3 |
|
Cylindrical Joints |
|
2 |
2 |
|
Spherical Joints |
|
3 |
0 |
|
Planar Joints |
|
1 |
2 |
|
Constant-Velocity Joints |
|
3 |
1 |
|
Screw Joints |
|
3 |
2 |
|
Fixed Joints |
|
3 |
3 |
|
Hooke Joint |
|
3 |
1 |
Universal Joint |
|
3 |
1 |
|
Complex joints indirectly connect parts by coupling simple joints. They include: Gear Joint and Coupler Joint. See table 2.4.