Doing an impact test and want to define a custom impact sequence? This is possible with LMS Test.Lab version 16 and later.
When performing an impact test, it is typically required to hit the structure multiple times or in several locations.
With the User Defined Impact Sequence, the increment button can now increment the accelerometer Point IDs in any custom fashion, no longer just numerically.
Imaging doing an impact on a simple plate.
The desired impact sequence is as follows:
Essentially, the desired sequence is to hit at plate:1 each run and then rove the accelerometers down the plate.
By default, Test.Lab increments numerically. After each run, each accelerometer location is incremented numerically by 1.
To create the custom impact sequence, turn on the desired number of channels in channel setup. In this instance, one hammer and three uniaxial accelerometers are used.
In the measure workbook, click “All Settings”.
In the “All Settings” pop-up window, select “User Defined Increment Sequence” and then close the window.
Back on the “Measure” screen, select “Edit Points…”.
This will open the “Edit points…” pop-up window.
In this case, 5 runs are desired. It is desired to hit the hammer at plate:1 for every run. The response locations and direction are then input for all the following runs.
Back on the measure screen, when the increment button is pushed the proper impact sequence is used (see below video).
Compare this with the default increment sequence (see below video).
Enjoy the flexibility the User Defined Increment table offers.
Questions? Contact us!