constraint modify joint cylindrical
Allows the modifcation of a cylindrical joint.
Format:
constraint modify joint cylindrical |
|---|
joint_name = | existing joint name |
new_joint_name = | new joint name |
adams_id = | Geom_id |
comments = | String |
translational_ic = | length |
no_translational_ic = | true |
velocity_ic = | velocity |
no_velocity_ic = | true |
rotational_ic = | angle |
no_rotational_ic = | true |
angular_velocity_ic = | angular_velocity |
no_angular_velocity_ic = | true |
i_marker_name = | existing marker |
j_marker_name = | existing marker |
Example:
constraint modify joint Cylindrical & |
|---|
joint_name = | .model_1.JOINT_2 & |
new_joint_name = | My_Cylinderical_joint & |
adams_id = | 2 & |
i_marker_name = | MARKER_2 & |
j_marker_name = | MARKER_3 |
Description:
Parameter | Value Type | Description |
|---|
joint_name | New joint name | Specifies the name of an existing joint. |
New_joint_name | New joint name | Specifies new name of the joint. You may use this name later to refer to this joint. |
adams_id | Integer | Specifies an integer used to identify this element in the Adams data file. |
comments | String | Specifies comments for the object being created or modified. |
translational_ic | Length | Specifies the initial translational displacement on a translational or cylindrical joint. |
no_translational_ic | True | Specifies that if a "translational" velocity initial condition has been set, to "UNSET" the "translational" velocity initial condition for the specified constraint. |
velocity_ic | Velocity | Specifies the initial translational velocity on a translational or cylindrical joint. |
no_velocity_ic | True | Specifies that if a VELOCITY_IC has been set via any means, to "UNSET" the velocity initial condition. |
rotational_ic | Real | Specifies the initial rotational displacement on a revolute or cylindrical joint. |
no_rotational_ic | True | Specifies that if a "rotational" velocity initial condition has been set, to "UNSET" the "rotational" velocity initial condition for the specified constraint. |
angular_velocity_ic | Angular_velocity | Specifies the initial angular velocity on a revolute or cylindrical joint. |
no_angular_velocity_ic | True | Specifies that if an "angular_velocity" initial condition has been set, to "UNSET" the "angular_velocity" initial condition for the specified constraint. |
i_marker_name | Existing marker | Specifies a marker on the first of two parts connected by this joint. |
j_marker_name | Existing marker | Specifies a marker on the second of two parts connected by this joint. |
Extended Definition:
1. Adams View will not allow you to have two joints with the same full name, so you must provide a unique name.
Normally, entity names are composed of alphabetic, numeric, or '_' (underscore) characters, and start with an alphabetic or '_' character. They may be any length. For more information, see
Using Extended Names.
By enclosing the name in double quotes, you may use other printable characters, or start the name with a numeral. If a name contains characters, or starts with a numeral, you must always quote the name when entering it.
Note that you can specify the parentage of an entity (for example, what part "owns" a marker or a geometry element) when you CREATE it by changing the name. If you enter just the entity name, then the default parent will be assigned by Adams View. If you type in the full name, then you may over ride the default parent. In most cases, when creating an entity, Adams View will provide a default name. The default name that Adams View provides will specify the parentage that it has assumed. You may, or course, delete this name and use your own. The form of a full name is:
"...._NAME.GRAND_PARENT_NAME.PARENT_NAME.ENTITY_NAME"
The number of levels used varies from case to case and the parentage must exist before an entity can be assigned to it.
2. When you use the FILE ADAMS_DATA_SET WRITE command, Adams View writes an Adams data file for your model. Adams requires that each modeling element be identified by a unique integer identifier. If you use this parameter to specify a non-zero identifier, Adams View will use it in the corresponding statement in the AdamsAdams data file.
You may also enter zero as an identifier, either explicitly or by default. The next time you write an Adams file, Adams View will replace the zero with a unique, internally-generated identifier. Adams View will permanently store this identifier with the element just as if you had entered it yourself.
Normally, you would let all identifiers default to zero, and Adams View would generate the identifiers for you. You are never required to enter a non-zero identifier. You only need to specify it if, for some reason, you wish to control the Adams file output.
3. Adams View measures the translational displacement of the origin of the I marker along the common z-axis of the I and the J markers with respect to the origin of the J marker.
If you specify TRANSLATIONAL_IC, but not VELOCITY_IC, Adams View will set VELOCITY_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
4. Adams View measures the translational velocity of the origin of the I marker along the common z-axis of the I and the J markers with respect to the origin of the J marker.
If you specify VELOCITY_IC, but not TRANSLATIONAL_IC, Adams View will set TRANSLATIONAL_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
5. Adams View measures the rotational displacement of the x-axis of the I marker about the common z-axis of the I and the J markers with respect to the x-axis of the J marker.
If you specify ROTATIONAL_IC, but not ANGULAR_VELOCITY_IC, Adams View will set ANGULAR_VELOCITY_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
6. Adams View measures the angular velocity of the x-axis of the I marker about the common z-axis of the I and the J markers with respect to the x-axis of the J marker.
If you specify ANGULAR_VELOCITY_IC, but not ROTATIONAL_IC, Adams View will set ROTATIONAL_IC to zero.
Joint initial conditions impose constraints that are active only during initial conditions analysis (not at the time of the initial configuration). Adams does not impose initial conditions during subsequent analyses.
If you impose initial conditions on the joint that are inconsistent with those on a part in the joint, the initial conditions on the joint have precedence over those on the part. However, if you impose initial conditions on the joint that are inconsistent with imparted motions on the joint, the initial conditions as specified by the motion generator have precedence over those here.
7. A cylindrical joint is a two-degree-of-freedom joint that allows both relative translational and relative rotational displacement of one part with respect to another. For a cylindrical joint, Adams keeps the z-axis of the I marker parallel to, and co-directed with, the z-axis of the J marker and confines the origin of the I marker to the z-axis of the J marker so that the I and the J markers have a common z-axis. To determine translational motion, Adams measures the movement of the origin of the I marker along the z-axis and with respect to the J marker. To determine rotational motion, Adams measures the rotation of the x-axis of the I marker about the common z-axis and with respect to the x-axis of the J marker.
Caution: | For the parameters “no_translational_ic”,”no_velocity_ic”,”no_rotational_ic”,setting it to true is not the same as setting the value to zero. A zero velocity is not the same as "no" velocity. Therefore, by setting this parameter to true there is no longer a velocity initial condition for this element. |
Tip: | Adams View connects one part at the I marker to the other at the J marker. |