ADAMS中运动副以及其摩擦力参数理论原理

Joints

Idealized Joints

About Idealized Joints

Idealized joints connect two parts. The parts can be rigid bodies, Flexible bodies, or Point mass es. You can place idealized joints anywhere in your model.

Note:The joints you can attach to flexible bodies depend on the version of Adams/Solver you are using (C++ or FORTRAN). In addition, Adams/Solver (C++) does not support point

masses.

For a summary of which joints and forces are supported on flexible bodies, see Table of

Supported Forces and Joints in the Adams/Flex online help. Also refer to the Adams/Flex

online help for more information on attaching joints and forces to flexible bodies. Adams/View supports two types of idealized joints: simple and complex. Simple joints directly connect bodies and include the following:

•Revolute Joints. See Revolute Joint Tool.

•Translational Joints. See Translational Joint Tool.

•Cylindrical Joints. See Cylindrical Joint Tool.

•Spherical Joints. See Spherical Joint Tool.

•Planar Joints. See Planar Joint Tool.

•Constant-Velocity Joints. See Constant-Velocity Joint Tool.

•Screw Joints. See Screw Joint Tool.

•Fixed Joints. See Fixed Joint Tool.

•Hooke/Universal Joint. See Hooke/Universal Joint Tool.

Complex joints indirectly connect parts by coupling simple joints. They include:

•Gears. See Gear Joint Tool.

•Couplers. See Coupler Joint Tool.

You access the joints through the Joint Palette and Joint and Motion Tool Stacks.

Creating Idealized Joints

The following procedure explains how to create a simple idealized joint. You can select to attach the joint to parts or spline curves. If you select to attach the joint to a curve, Adams/View creates a curve marker,

Adams/View

2

Joints

and the joint follows the line of the curve. Learn more about curve markers with Marker Modify dialog

box help. Attaching the joint to a spline curve is only available with Adams/Solver (C++). L earn about

switching solvers with Solver Settings - Executable dialog box help.

Note that this procedure only sets the location and orientation of the joint. If you want to set the friction

of a joint, change the pitch of a screw joint, or set initial conditions for joints, modify the joint.

To create a simple idealized joint:

1.From the Joint palette or tool stack, select the joint tool representing the idealized joint that you

want to create.

2.In the settings container, specify how you want to define the bodies the joint connects. You can

select:

• 1 Location (Bodies Implicit)

• 2 Bodies - 1 Location

• 2 Bodies - 2 Locations

For more on the effects of these options, see the help for the joint tool you are creating and

Connecting Constraints to Parts.

3.In the settings container, specify how you want the joint oriented. You can select:

•Normal to Grid - Lets you orient the joint along the current Working grid, if it is displayed, or normal to the screen.

•Pick Geometry Feature - Lets you orient the joint along a direction vector on a feature in your model, such as the face of a part.

4.If you selected to explicitly define the bodies by selecting 2 Bodies - 1 Location or 2 Bodies - 2

Locations in Step 2, in the settings container, set First Body and Second Body to how you want

to attach the joint: on the bodies of parts, between a part and a spline curve, or between two spline

curves.

ing the left mouse button, select the first part or a spline curve (splines and data element curves

are all considered curves). If you selected to explicitly select the parts to be connected, select the

second part or another curve using the left mouse button.

6.Place the cursor where you want the joint to be located (for a curve this is referred to as its curve

point), and click the left mouse button. If you selected to specify its location on each part or curve,

place the cursor on the second location, and click the left mouse button.

7.If you selected to orient the joint along a direction vector on a feature, move the cursor around in

your model to display an arrow representing the direction along a feature where you want the joint

oriented. When the direction vector represents the correct orientation, click the left mouse button.

Modifying Basic Properties of Idealized Joints

You can change several basic properties about an Idealized joints. These include:

•Parts that the joint connects. You can also switch which part moves relative to another part.