force modify body gravitational
Allows modification of the gravitational body object.
Format:
force modify body gravitational |
|---|
gravity_field_name = | existing_gravity_field_name |
new_gravity_field_nam= | new_gravity_field_name |
comments = | comment_string |
units_consistency_factor = | real_number |
x_component_gravity = | real_number |
y_component_gravity = | real_number |
z_component_gravity = | real_number |
Example:
force modify body gravitational & |
|---|
gravity_field_name = | gravity & |
new_gravity_field_name = | ACCGRAV__1 & |
comments = | comment_string & |
units_consistency_factor = | 0.1 & |
x_component_gravity = | 0.99 & |
y_component_gravity = | 0.88 & |
z_component_gravity = | 0.9 |
Description:
Parameter | Value Type | Description |
|---|
gravity_field_name | An Existing Gravity Field | Specifies the gravity field to modify. You use this parameterto identify the existing gravity field to affect with thiscommand. |
new_gravity_field_name | A New Gravity Field | Specifies the name of the new gravity field. You may use this name later to refer to this gravity field. Adams Viewwill not allow you to have two gravity fields with the same full name, so you must provide a unique name. |
comments | String | Specifies comments for the object being created or modified. |
units_consistency_factor | Real | Specifies a conversion factor to make your force, mass, length, and time units consistent. If you do not specify UNITS_CONSISTENCY_FACTOR, or specify it as zero, Adams View will calculate it for you when it writes theAdams data set. |
x_component_gravity | Acceleration | Specifies the x component of gravitational acceleration with respect to the ground reference frame |
y_component_gravity | Acceleration | Specifies the y component of gravitational acceleration with respect to the ground reference frame |
z_component_gravity | Acceleration | Specifies the z component of gravitational acceleration with respect to the ground reference frame |
Extended Definition:
1. In conjunction with the part masses, the gravitational field defines a body force atthe center of gravity of each part. The force direction is defined by the X_COMPONENT_GRAVITY, Y_COMPONENT_GRAVITY, and Z_COMPONENT_GRAVITY parameters. The force magnitude is the part mass multiplied by the magnitude of the gravity vector. Each gravity field is written as an Adams ACCGRAV statement. Although Adams View allows you to create more than one gravity field, you should only use one, since Adams only allows one ACCGRAV statement.
2. You may also specify UNITS_CONSISTENCY_FACTOR in a gravity field.Adams View writes this as the GC parameter in the ACCGRAV statement. AlthoughUNITS_CONSISTENCY_FACTOR affects the reporting of all forces, not justgravitational, it is included here because it also appears in the ACCGRAVstatement.
3. You may identify a gravity field by typing its name or by picking it from the screen. If the gravity field is not visible on the screen, you must type the name. You may also find it convenient to type the name even if the gravity field is displayed.
If you created the gravity field by reading an Adams data set file, the gravity field name is 'acc'. If you created the gravity field during preprocessing, you gave it a name at that time. If a gravity field 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 gravity field under a different model, for instance, you may need to enter the model name as well. For example, you may specify gravity field 'grav' from model 'robot' by entering ".robot.grav". You must separate multiple gravity-field names by commas.
If the gravity field 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 gravity-field picks by commas.
4. 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 (e.g. 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"
5. The number of levels used varies from case to case and the parentage must exist before an entity can be assigned to it.
6. 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.
7. You may select any force, mass, length, or time units you wish. In order for Adams results to be meaningful, however, you or Adams View must compute a factor such that the equationForce = (Mass / UNITS_CONSISTENCY_FACTOR) * Accelerationis satisfied. For example, if you use Newtons, kilograms, millimeters, and seconds, UNITS_CONSISTENCY_FACTOR is 1000. Adams documentation and Data Set Language refer to this factor as GC, on the ACCGRAV card. The only case in which you should set UNITS_CONSISTENCY_FACTOR yourself is when you are using a set of units Adams View does not support. Otherwise, you should probably let Adams View compute it for you. If you do use this command to set UNITS_CONSISTENCY_FACTOR to a non-zero value, Adams View will write your value to an Adams data set.Adams View will not change your value, even if you later change your force, mass, length, or time units. If you explicitly set UNITS_CONSISTENCY_FACTOR, then later change your units, remember to updateUNITS_CONSISTENCY_FACTOR.
Tips:
■If you type a "?", Adams View will list the gravity fields available by default.