defaults units
Allows you to set the default length, angle, force, mass, time units, as well as the conventions for coordinates and orientation angles. It can also toggle between using full unit names and abbreviations for axis labels.
Format:
defaults units |
|---|
force = | force_units |
mass= | mass_units |
length = | linear_units |
time = | time_units |
angle = | angular_units |
frequency = | frequency_units |
coordinate_system_type = | coordinate_system_type |
orientation_type = | orientation_type |
axis_labels = | full_unit_names or abbreviations |
Example:
defaults units & |
|---|
force = | newton & |
mass = | kg & |
length = | meter & |
time = | second & |
angle = | degrees & |
frequency = | hz & |
coordinate_system_type = | cartesian & |
orientation_type = | space313 & |
axis_labels = | abbrevations |
Description:
Parameter | Value Type | Description |
|---|
force | Force_units | Specifies the default force units |
mass | Mass_units | Specifies the default mass units |
length | Linear_units | Specifies the default length units |
Time | Time_units | Specifies the default time units |
units_consistency_factor | Real | Specifies a conversion factor to make your force, mass, length, and time units consistent |
angle | Angular_units | Specifies the default angle units |
frequency | Frequency_units | Specifies the default frequency units |
coordinate_system_type | Coordinate_system_type | Specifies a Cartesian, cylindrical, or spherical coordinate system as the default |
orientation_type | Rotation_sequence | Specifies the axes and axis rotation order that Adams View should use when interpreting orientation angles |
axis_labels | full_unit_names or abbreviations | Specifies the axis label units to be written as full unit names or abbreviations. |
Extended Definition:
1. Adams View will use these units for any values you enter and any values it displays. Adams View also assumes these units for values read from or written to a file, unless you override them with parameters on the file read or write command. Adams View uses the coordinate and orientation conventions to interpret values you enter for location and orientation parameters, such as LOCATION and ORIENTATION on the 'MARKER CREATE' command.
2. You may select any force, mass, length, or time units you wish. For Adams results to be meaningful, however, you or Adams View must compute a factor such that the equation
Force = (Mass / UNITS_CONSISTENCY_FACTOR) * Acceleration is 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.
3. By default, Adams View will compute the proper factor when you write an Adams data set. You may, if you wish, specify it yourself using the 'FORCE CREATE BODY GRAVITATIONAL' command.
4. Adams View will use these units for any values you enter and any values it displays. Adams View also assumes these units for values read from or written to a file, unless you override them with parameters on the file read or write command.
5. If you do not specify UNITS_CONSISTENCY_FACTOR, or specify it as zero, Adams View will calculate it for you when it writes the Adams data set. You may select any force, mass, length, or time units you wish. For Adams results to be meaningful, however, you or Adams View must compute a factor such that the Equation
Force = (Mass / UNITS_CONSISTENCY_FACTOR) * Acceleration is 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.
6. 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 update UNITS_CONSISTENCY_FACTOR.
7. When specifying a location, in order to specify the coordinate system, you provide three coordinates with respect to the X, Y, and Z axes of a model, part, or marker. In a Cartesian coordinate system, you specify x, y, and z. These are distances from the coordinate system origin to the point along the X, Y, and Z axes. In a cylindrical coordinate system, you specify r, theta, and z. R is the distance in the XY plane to the point. R is measured from the origin to the point projected onto the XY plane. Theta is the angle in the XY plane to the point. Theta is measured from the X axis to the line connecting the origin and the point projected into the XY plane. Theta is positive towards the Y axis (that is, the right-hand rule about the Z axis). Z is the distance to the point along the Z axis.
In a spherical coordinate system, you specify rho, phi, theta. Rho is the distance from the origin to the point. Phi is the angle between the Z axis and the line connecting the origin and the point. Theta is the angle in the XY plane to the point, as in cylindrical coordinates. Distances are in the length units you have chosen. Angles are in the angle units you have chosen.
8. Adams View uses the three orientation angles to do three rotations about the axes of the coordinate system involved. These rotations may be space-fixed or body-fixed, and in any sequence. You specify the rotation sequence as three digits which determine which axes are rotated about, and in what order.The numbers 1,2,3 correspond to X, Y, Z axes. A rotation order of '312', for example, produces rotations about the Z, then X, then Y axes. If you select body-fixed rotations, Adams View applies the rotations about axes that move with the body as it rotates. The first rotation produces a new set of axes. The second rotation is applied about one of the new axes, producing another set of axes. The third rotation is applied about one of the 'new-new' axes, and produces the final orientation. If you select space-fixed rotations, Adams View applies the rotations about axes that remain in their original orientation.
Example: body313
■'body' indicates a progressive set of rotations.
■'313' indicates the axis rotation order is ZXZ.
■The first rotation will be about the existing Z-axis.
This produces new X and Y axes.
■The second rotation will be about the new X-axis.
This produces new Z and Y axes.
■The third rotation will be about the new Z-axis.
Example: space313
■'space' indicates a fixed set of rotations.
■'313' indicates the axis rotation order is ZXZ.
■The first rotation will be about the original Z-axis.
■The second rotation will be about the original X-axis.
■The third rotation will be about the original Z-axis.
9. Adams View will use full unit names in axis labels by default.