constraint modify complex_joint gear
Allows the modification of an existing gear pair.
Format:
constraint modify complex_joint gear |
|---|
gear_name = | an existing joint |
new_gear_name = | a new joint |
adams_id = | integer |
comments = | string |
joint_name = | an existing joint |
common_velocity_marker = | an existing marker |
Example:
constraint modify complex_joint gear & |
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gear_name = | GEAR__1 & |
new_gear_name = | GEAR__2 & |
adams_id = | 2 & |
comments = | "comment string" & |
joint_name = | JOINT__1 & |
common_velocity_marker = | marker_1 |
Description:
Parameter | Value Type | Description |
|---|
gear_name | An existing gear | Specifies the gear to modify. |
new_gear_name | A new gear | Specifies the name of the new gear. . |
adams_id | ADAMS_ID | Specifies an integer used to identify this element in the Adams data file. |
comments | String | Specifies comments for the object being created or modified. |
joint_name | An Existing Joint | Specifies the translational, revolute, or cylindrical joint associated with this entity. |
common_velocity_marker | An Existing Marker | Specifies the marker that designates the point of contact and determines the ratio of the two gears. |
Extended Definition:
1. The gear element uses the location of the common velocity marker to determine the point of contact of the two gear pitch circles. The direction of the z-axis of the common velocity marker indicates the direction of the common velocity of points on the gear teeth in contact. This is also the direction in which gear tooth forces act. The location of the common velocity marker is constant with respect to the carrier part.
2. You may identify a gear pair by typing its name or by picking it from the screen.
If the gear pair is not visible on the screen, you must type the name. You may also find it convenient to type the name even if the gear is displayed. If you created the gear by reading an Adams data set, the gear name is the letters GEA followed by the Adams data set gear ID number. The name of Adams GEAR/101 is GEA101, for example. If you created the gear during preprocessing, you gave it a name at that time. If a gear is available by default, you may identify it by entering its name only. If it is not, you must enter its full name. To identify a gear under another model, for instance, you may need to enter the model name as well. For example, you may specify gear 'spur1' from model 'train' by entering ".train.spur1". You must separate multiple gear names by commas. If the gear is visible in one of your views, you may identify it by picking on any of the graphics associated with it. You need not separate multiple gear picks by commas.
3. Normally, entity names like the gear name 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 defaultname 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.
4. 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 Adams 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.
5. When an Adams Solver data file (.adm) is read into Adams View, all comments associated with a statement (from the end of the previous statement through the end of the current statement) are stored with the object. Comments in the data file can be associated with model. These comments must follow the title statement and be followed by the comment 'END OF MODEL COMMENTS'. This string must be uppercase. When an Adams Solver data file is written, the comments for an object are written before the statement corresponding to the object.
6. You may identify a joint by typing its name or by picking it from the screen. If the joint is not visible on the screen, you must type the name. You may also find it convenient to type the name even if the joint is displayed. If you created the joint by reading an Adams data set or graphics file, the joint name is the letters JOI followed by the Adams data set joint ID number. The name of Adams JOINT/101 is JOI101, for example. If you created the joint during preprocessing, you gave it a name at that time. If a joint is available by default, you may identify it by entering its name only. If it is not, you must enter its full name. To identify a joint under a model, for instance, you may need to enter the model name as well. For example, you may specify joint 'lower_pivot' in model 'links' by entering ".links.lower_pivot". If you type a "?", Adams View will list the joints available by default. You must separate multiple joint names by commas. If the joint is visible in one of your views, you may identify it by picking on any of the graphics associated with it. You need not separate multiple joint picks by commas.
7. You define the constant-velocity (CV) marker on the carrier part to which the J markers of the joints belong. The z-axis of this marker must point in the direction of common velocity at the point of contact. The direction of common velocity is tangent to both pitch circles and would be normal to the tooth surfaces of the gears if the pressure angle was zero. (Adams always assumes a pressure angle of zero.)
The CV marker has constant position and orientation in the carrier LPRF and does not change when the direction of power flow through the gear changes.
8. A gear pair relates the motion of three parts and two joints. The three parts are the two gear parts and a third part, the carrier, to which the gears are attached by the two joints. The joints must be translational, revolute, or cylindrical. Different combinations of joint types and orientations allow you to model spur, helical, planetary, bevel, and rack-and-pinion gear pairs.
Tip: | 1. If you type a "?", Adams View will list the gears available by default. 2. You use the joint_name parameter to identify the existing gear to affect with this command. 3. You may use the new_gear_name later to refer to this gear. Adams View will not allow you to have two gears with the same full name, so you must provide a unique name. 4. Some entities constraint motion at, or are otherwise associated with, specific joints. You use this parameter to identify that joint. 5. The common_velocity_marker also determines the direction of the reaction forces developed by the joints in the gear pair. |