Method for High Frequency Wear Testing
The purpose of this project is to continue improving upon the existing test rig prototype
from last year’s team ME60. The requirements of the test rig are to represent low
amplitude (10 mil), high frequency (up to 1000 Hz) controlled wear patterns such as a
circle on a test specimen, while also applying a vertical load on the test specimen.
The test rig consists of a magnetic bearing which creates a magnetic field to control the
movement of a center core piece in user defined wear patterns. A LabVIEW VI sends
signals to external soundcards, which further send the signals to amplifiers to control
the power of the magnetic bearing’s coils. This LabVIEW VI is capable of changing the
frequency and amplitude of the desired signals, as well as the desired wear motion
pattern of the core. The VI also measures the movement of the core and plots this as a
comparison to the desired wear motion patterns.
A 3D printed platform is fastened into the core, upon which a material sample is
mounted. The vertical load applicator frame includes a 3D printed test specimen holder.
The test specimen holder is depressed by way of a pneumatic actuator, thereby
pressing the specimen against the material sample it will wear against during testing.
Load cells connected to the specimen holder measure the forces experienced by the
test specimen when the core is in motion, while position sensors measure the motion of
the core within the magnetic field.