PPOD User Guide
This article outlines the setup and use of the 6 DoF PPOD for part manipulation and flexure testing, as well as analysis of flexure test results.
DAQ Info
PCI Cards
For all uses of the 6 DoF PPOD the computer should have the National Instruments PCI-6224 input DAQ card and the National Instruments PCI-6713 output DAQ card. The installed National Instruments DAQ cards can be checked using the MATLAB command:
daqhwinfo('nidaq')
The BoardNames match up with the respective InstalledBoardIds in the output structure. If the PPOD does not work, ensure that the DAQ objects were initialized properly by comparing the 'DevX' from above with the handles.daqinfo.ai and handles.daqinfo.ao object in the Initializedaqinfo.m file, set in lines 25-26. Output channels should be 0:6 (0 is the clock pulse, 1:6 are speaker channels) set in line 36. Input channels should be 0:11 (for the 12 accelerometer signals) set in line 39.
Calling this with no argument outputs a structure with all of the available DAQ hardware:
daqhwinfo
DAQ Board
The output card connects to the lower left socket in the photo above. The input card has two ribbon cables that connect to the other two sockets along the bottom: the upper cable on the PCI card connects to the right socket (channels AI0:AI15) and the lower cable connects to the middle socket (channels AI16:AI31).
The ribbon cable socket along the right edge connects to the accelerometer/speaker board, providing power and accelerometer readings.
The D-Sub socket in the upper right corner is for the force sensor used in flexure testing experiments. The switches above the screw terminals should both be to the left. For part manipulation the force sensor should be unplugged as it adds a small amount of noise to the other signals in the system.
The power socket is on the left edge with the power switch found directly below it. The six speaker outputs are found along the top with speaker 1 on the far left and speaker 6 on the right.
All screw terminals should be empty during normal use (with the exception of channels 16:17 and 24:25 which can be used at any time). The input channels can also be used to read in signals from the screw terminals found above the lower sockets. To read in from the screw terminals for channels 0:15, unplug the ribbon cable leading to the accelerometer board. To read channels 18:23, slide the right switch found above the screw terminals to the right. The same goes for channels 26:31 with the left switch.
