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ACCLR |
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ACCLR |
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»Click here to display Table of Contents«
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ACCLR |
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ACCLR |
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ACCLR – Accelerometer for Geometric Nonlinear Analysis
Defines accelerometer for geometric nonlinear analysis.
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ACCLR |
AID |
GID |
FCUT |
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AID |
Unique accelerometer identification number. (Integer > 0) |
GID |
Grid point identification number. (Integer > 0) |
FCUT |
Cutoff frequency. (Real > 0) |
| 1. | The accelerometer option computes a filtered acceleration in the output system. |
| 2. | These filtered accelerations provided by an accelerometer are used in either a SENSOR or in post-processing acceleration time history without aliasing problems. |
| 3. | A 4-pole Butterworth filter is used. |
| 4. | The recommended value for FCUT is 1650 Hz (1.65 ms-1) to obtain a class 1000 SAE filtering. |
| 5. | In addition to these filtered accelerations, the accelerometer also allows the output of the integrals of X, Y, and Z of the raw accelerations projected to the output coordinate system to time history. These quantities are not used by SENSOR. |
| 6. | Note that if the coordinates are moving, the integrals of X, Y, and Z raw accelerations projected to the output coordinate system are not the same as the velocities projected to the output coordinate system, as described in XHIST. Computation of these integrals in a post-processor allows retrieving the accelerations projected to the output coordinate system without aliasing problems. Integration and differentiation are acting like another filter on top of the 4-pole Butterworth. |
| 7. | This card is unsupported in HyperMesh. |
