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WinTest® Software Tech Tips
DiskFG
DiskFG is an optional WinTest® software feature that allows the user to program custom waveforms, time histories, or extended function generation sequences to be used in tests where a more complex drive function is needed for testing.
A waveform or waveform sequence is created in an external file and the data in the file is used to drive the system. These data files may be constructed in one of two ways, either point-by-point or by specifying frequency/level end levels.
The point-by-point approach defines each point that is to be output as a function of time. The points are evenly spaced in time and connected by steps, so it is important that the time between points be short (close to the update rate of the system controller) to avoid a stair-step behavior in the waveform generation. The user can create the drive file from WinTest timed data or use any ASCII text file properly formatted. One restriction is that there currently aren't any compensation techniques available for this waveform option. Important points to remember are:
- End levels are connected by steps;
- End levels are entered as a percent of full scale for the desired feedback;
- Point by point waveforms can be used for single or multi-axis systems.
The Frequency/level option provides the ability to combine sinusoidal or ramp
waveforms similar to the WinTest Block Waveform option. This option makes it easy
to define a large group of end levels. The user can define one frequency or velocity to use for all steps, or define a frequency and velocity for each step. A few key points for this option are:
- The user may choose whether all end levels are connected by a half sine or
ramp waveform;
- Entered end levels are input as a percent of full scale.
A typical example of a Frequency/level format is shown in the following figure where a section of an aerospace fatigue test sequence is shown below.
The DiskFG function has been used for a variety of simulation testing applications where complex drive signals are required. Waveform examples include the heel-to-toe gait profile for a running shoe test, a displacement waveform that applies strain at a true strain rate, a road load profile for an automotive component fatigue test, or a ground-air-ground sequence for an aerospace durability application.
The DiskFG function is a very useful option for WinTest software users and should be considered for test applications where non-standard function generation is required.
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