*** technofysica_sets_*_tudelft.zip ***

This dataset consists of 8 .mat-files, each representing a multichannel 
measurement of machine vibration. The machine under investigation is a pump 
that is driven by an electromotor. The incoming shaft is reduced in speed by 
two delaying gear-combinations (a gear-combination is a combination of 
driving and a driven gear). The number of teeth in the gears are: 
 
		  gear-combination:   1                 2
driving/driven
 
 driving				
 driven

Measurements are repeated for two identical machines, where the first (pump no. 2) shows a progressed pitting in both gears, and the second machine (pump no.3) is virtually fault free. 

The rotating speed of the driving shaft is measured with a tachometer. This measurement is done synchronously with the 7 vibration measurements, and is stored in channel 8. 

The measurements are also repeated for two operating conditions: 
** minimum load (000)
** maximum load (200)

Some more details: 

* 7 accelerometers were used, in the following manner: 
  sensor 1,2 are radially mounted near the driving shaft, with an angle of 
	  90 degrees between them
  sensor 3 is axially mounted near the driving shaft
  sensor 4-7 are radially mounted on different parts of the machine

  Schematically:

     E	  A			MC
  **** **     *******************************
  *     *  1,2*		4		6   *
  *     *******3	B	 	C   * 	
  *     *******				    *
  *     * T   *		5		7   *	
  *******     *******************************
					**
					**
					** D	

  E = electromotor
  A = incoming shaft (driving shaft)
      (coupling between E and P is flexible)
  MC = machine casing
  T = tachometer (== sensor 8)
  B = first delay (gear-combination) 
  C = second delay (gear-combination) 
  D = outgoing shaft (to vane in water) 

  1-7: position of sensors 1,7
  
  The channels are numbered according to these sensor numbers

Measurement details: 

 a. the high-frequency measurements (hf_...):

 * data was measured for 6.1 seconds, lowpass-filtered (analog) to 5 KHz and 
   digitized at 12.800 Hz (oversampled). This gives a datalength of 6.1*12800 = 77824


 b. the low-frequency measurements (lf_...):

 * data was measured for 24.3 seconds, lowpass-filtered (analog) to 1 KHz and 
   digitized at 3200 Hz (oversampled). This gives a datalength of 24.3*3200 = 77824

In the _small datafiles, you'll find a subset of the above datasets. Datalengths are now only 16384. 

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

This dataset was acquired in the Delft "Machine diagnostics by neural networks"-project with help from 

* TechnoFysica b.v., The Netherlands 

and can be downloaded freely at the following web-address: 

* http://www.ph.tn.tudelft.nl/~ypma/mechanical.html 

(c) 12-08-99 Pattern recognition group, Delft University of Technology
    Remarks should be directed to: 

    Alexander Ypma
    ypma@ph.tn.tudelft.nl