Condition monitoring of hydraulic systems Data Set at ZeMA

Abstract:

The data set addresses the condition assessment of a hydraulic test rig based on multi sensor data. Four fault types are superimposed with several severity grades impeding selective quantification.

Source:

Creator: ZeMA gGmbH, Eschberger Weg 46, 66121 Saarbrücken
Contact: t.schneider '@' zema.de, s.klein '@' zema.de, m.bastuck '@' lmt.uni-saarland.de, info '@' lmt.uni-saarland.de

Data Set Information:

The data set was experimentally obtained with a hydraulic test rig. This test rig consists of a primary working and a secondary cooling-filtration circuit which are connected via the oil tank [1], [2]. The system cyclically repeats constant load cycles (duration 60 seconds) and measures process values such as pressures, volume flows and temperatures while the condition of four hydraulic components (cooler, valve, pump and accumulator) is quantitatively varied.

Attribute Information:

The data set contains raw process sensor data (i.e. without feature extraction) which are structured as matrices (tab-delimited) with the rows representing the cycles and the columns the data points within a cycle. The sensors involved are:
Sensor Physical quantity Unit Sampling rate
PS1 Pressure bar 100 Hz
PS2 Pressure bar 100 Hz
PS3 Pressure bar 100 Hz
PS4 Pressure bar 100 Hz
PS5 Pressure bar 100 Hz
PS6 Pressure bar 100 Hz
EPS1 Motor power W 100 Hz
FS1 Volume flow l/min 10 Hz
FS2 Volume flow l/min 10 Hz
TS1 Temperature °C 1 Hz
TS2 Temperature °C 1 Hz
TS3 Temperature °C 1 Hz
TS4 Temperature °C 1 Hz
VS1 Vibration mm/s 1 Hz
CE Cooling efficiency (virtual) % 1 Hz
CP Cooling power (virtual) kW 1 Hz
SE Efficiency factor % 1 Hz

The target condition values are cycle-wise annotated in ‘profile.txt’ (tab-delimited). As before, the row number represents the cycle number. The columns are

1: Cooler condition / %:
3: close to total failure
20: reduced effifiency
100: full efficiency

2: Valve condition / %:
100: optimal switching behavior
90: small lag
80: severe lag
73: close to total failure

3: Internal pump leakage:
0: no leakage
1: weak leakage
2: severe leakage

4: Hydraulic accumulator / bar:
130: optimal pressure
115: slightly reduced pressure
100: severely reduced pressure
90: close to total failure

5: stable flag:
0: conditions were stable
1: static conditions might not have been reached yet

Relevant Papers:

[1] Nikolai Helwig, Eliseo Pignanelli, Andreas Schütze, ‘Condition Monitoring of a Complex Hydraulic System Using Multivariate Statistics’, in Proc. I2MTC-2015 - 2015 IEEE International Instrumentation and Measurement Technology Conference, paper PPS1-39, Pisa, Italy, May 11-14, 2015, doi: 10.1109/I2MTC.2015.7151267.
[2] N. Helwig, A. Schütze, ‘Detecting and compensating sensor faults in a hydraulic condition monitoring system’, in Proc. SENSOR 2015 - 17th International Conference on Sensors and Measurement Technology, oral presentation D8.1, Nuremberg, Germany, May 19-21, 2015, doi: 10.5162/sensor2015/D8.1.
[3] Tizian Schneider, Nikolai Helwig, Andreas Schütze, ‘Automatic feature extraction and selection for classification of cyclical time series data’, tm - Technisches Messen (2017), 84(3), 198 – 206, doi: 10.1515/teme-2016-0072.

Citation Request:

Nikolai Helwig, Eliseo Pignanelli, Andreas Schütze, ‘Condition Monitoring of a Complex Hydraulic System Using Multivariate Statistics’, in Proc. I2MTC-2015 - 2015 IEEE International Instrumentation and Measurement Technology Conference, paper PPS1-39, Pisa, Italy, May 11-14, 2015, doi: 10.1109/I2MTC.2015.7151267.