This page provides details about the apparatus used to collect data for the PHM09 Data Challenge.


The data presented here is representative of generic industrial gearbox data. Figure 1 is a schematic of the gearbox used to collect the data.

Gearbox Schematic
Figure 1: Schematic of the apparatus (click to enlarge).

Two geometries are used,one using a spur gears, the other using spiral cut (helical) gears. The spur geometry is:

  • Input shaft: 1-Input Pinion: 32 teeth
  • Idler shaft: 1st idler gear: 96 teeth
  • Idler shaft: 2nd (output) idler gear: 48 teeth
  • Output shaft: output pinion: 80 teeth

Thus, from input to output the gear reduction ratio is: 16/48*24/40, or 5 to 1 reduction.

Acquisition System

Endevco 10mv/g Accel, +/- 1% error, Resonance > 45KHz.
Three Channels:

  • Channel 1 is the input side Accelerometer
  • Channel 2 is the output side Accelerometer
  • Channel 3 is the Tachometer Signal: 10 pulse per revolution

Sample Rate: 66,666.67 Samples per Second (200 KHz/3).


MB Manufacturing ER-10K
Number of Elements: 8
Roller Element Diameter: 0.3125″
Pitch Diameter: 1.319″
Contact Angle: 0

Apparatus overview
Figure 2: Overview of the apparatus (click to enlarge).

Inside the gearbox
Figure 3: Inside the gearbox (click to enlarge).

Inside the gearbox detail
Figure 3a: Inside the gearbox detail (click to enlarge).

Example gear faults
Figure 4: Example of gear faults. Left to right: normal, missing tooth, chipped tooth (click to enlarge).

Location of input shaft accelerometer
Figure 5: Location of input shaft accelerometer.

Location of output shaft accelerometer
Figure 6: Location of output shaft accelerometer.

etail of tachometer pickup
Figure 7: Detail of tachometer pickup.

A video of the system being run can be downloaded here. The change in gearbox tone is a function of the brake being applied.