System information

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Blastware Advanced Module
Blastware Operator Manual 6–55
a. Frequency Weighting File
Press the Browse button to navigate through your directories and load an existing frequency
weight table (.fwt) file. You can also Edit an existing file by clicking the Edit button, or create a
new file by clicking on New.
b. Data Selection
To generate VDV for the entire waveform select All Waveform. You may also specify only a part
of the waveform. Click on Partial Waveform, and then enter the From and To time values.
c. Calculate
Click on Calculate to update or generate a new VDV and RMS calculation.
d. Exit
This command Exits the Human Exposure tool.
6.10.12 Transfer Function
This tool is only available when an Analysis window is open. Use the Transfer Function tool to
determine structural response. The Transfer Function is the result of calculating the ratio of two
frequency spectras. One spectrum, the driving function, is computed from a waveform recorded
with a transducer located outside a building or structure; the second spectrum, the response
spectrum, is recorded with a transducer mounted inside the building or structure. The ratio of the
response function to the driving function is the resultant Transfer Function. The Transfer Function
can also be used to help determine the Natural Frequency of a building or structure.
You can only use the Transfer Function within one Event and it must be a Compliance Event
(Example: With a 4 channel Event, you will need two channels in the same orientation; if you are
using a triaxial sensor, you will need an 8 channel unit). To access the Transfer Function, click
once on the natural frequency event within the Event Manager, and then select the Analysis icon.
From the Tools menu, select the Transfer Function feature. The Transfer Function menu will
appear.
a. Ground Channel
Select the appropriate Ground Channel from the drop down list. The Ground channel represents
the driving function.
b. Structure Channel
Select the appropriate Structure Channel from the drop down list. The Structure Channel
represents the response to the Ground Channel vibration.
c. Lower Frequency Limit
Use the up and down arrow keys to define the Lower Frequency Limit you want to process. The
allowable limit is 2 – 300.