MAFAULDA

Machinery Fault Database [Online]

Database

MAFAULDA

 

1. Database Description

1.1. Introduction

This database is composed of 1951 multivariate time-series acquired by sensors on a SpectraQuest's Machinery Fault Simulator (MFS) Alignment-Balance-Vibration (ABVT). The 1951 comprises six different simulated states: normal function, imbalance fault, horizontal and vertical misalignment faults and, inner and outer bearing faults. This section describes the database.

For more information please contact Felipe M. L. Ribeiro (felipe.ribeiro@smt.ufrj.br).

1.2. Experimental Bench Specifications

The used SpectraQuest Inc. Alignment/Balance Vibration Trainer (ABVT) Machinery Fault Simulator (MFS).

Specification Value Unit
Motor 1/4CV DC
Frequency range 700-3600rpm
System weight 22kg
Axis diameter 16mm
Axis length 520mm
Rotor 15.24cm
Bearings distance 390mm
Specification Value Unit
Number of balls 8
Balls diameter 0.7145cm
Cage diameter 2.8519cm
FTF 0.3750CPM/rpm
BPFO 2.9980CPM/rpm
BPFI 5.0020CPM/rpm
BSF 1.8710CPM/rpm

1.3. Data Acquisition System

1.4. Sequences

Each sequence was generated at a 50 kHz sampling rate during 5 s, totaling 250.000 samples. Below its a summary of each type of sequence:

Sequence Measurements
Normal 49
Horizontal misalignment197
Vertical misalignment 301
Imbalance 333
Underhang bearing
Cage fault188
Outer race184
Ball fault186
Overhang bearing
Cage fault188
Outer race188
Ball fault137
Total1951

1.4.1. Normal Sequences

There are 49 sequences without any fault, each with a fixed rotation speed within the range from 737 rpm to 3686 rpm with steps of approximately 60 rpm.

1.4.2. Imbalance Faults

Simulated with load values within the range from 6 g to 35 g. For each load value below 30 g, the rotation frequency assumed in the same 49 values employed in the normal operation case. For loads equal to or above 30 g, however, the resulting vibration makes impracticable for the system to achieve rotation frequencies above 3300 rpm, limiting the number of distinct rotation frequencies. The table below presents the number of sequences per weight.

Weight (g) Measurements
649
1048
1548
2049
2547
3047
3545
Total 333

1.4.3. Horizontal Parallel Misalignment

This type of fault was induced into the MFS by shifting the motor shaft horizontally of 0.5 mm, 1.0 mm, 1.5 mm, and 2.0 mm. Using the same range for the rotation frequency as in the normal operation for each horizontal shift, the table below presents the number of sequences per degree of misalignment.

Misalignment (mm) Measurements
0.5050
1.0049
1.5049
2.0049
Total 197

1.4.4. Vertical Parallel Misalignment

This type of fault was induced into the MFS by shifting the motor shaft horizontally of 0.51 mm, 0.63 mm, 1.27 mm, 1.40 mm, 17.8 mm and 1.90 mm. Using the same range for the rotation frequency as in the normal operation for each vertical shift, the table below presents the number of sequences per degree of misalignment.

Misalignment (mm) Measurements
0.5151
0.6350
1.2750
1.4050
1.7850
1.9050
Total 301

1.4.5. Bearing Faults

As one of the most complex elements of the machine, the rolling bearings are the most susceptible elements to fault occurrence. The ABVT manufacturer provided three defective bearing, each one with a distinct defective element (outer track, rolling elements, and inner track), that were placed one at a time in two different positions in the MFS experimental stand: between the rotor and the motor (underhang position), or in the external position, having the rotor between the bearing and the motor (overhang position). Bearing faults are practically imperceptible when there is no imbalance. So, three masses of 6 g, 20 g, and 35 g were added to induce a detectable effect, with different rotation frequencies as before.

Underhang

The table below presents the underhang cases with outer track faults.

Weight (g) Measurements
049
648
2049
3542
Total 188

The table below presents the underhang cases with rolling elements faults.

Weight (g) Measurements
049
649
2049
3537
Total 184

The table below presents the underhang cases with inner track faults.

Weight (g) Measurements
050
649
2049
3538
Total 186

The underhang has a total of 558 sequences.

Overhang

The table below presents the overhang cases with outer track faults.

Weight (g) Measurements
049
649
2049
3541
Total 188

The table below presents the overhang cases with rolling elements faults.

Weight (g) Measurements
049
649
2049
3541
Total 188

The table below presents the overhang cases with inner track faults.

Weight (g) Measurements
049
643
2025
3520
Total 137

The overhang sequences totaling 513.

2. Machinery Fault Database [Online]

The following table contains links to entire parts of this database, joined in as a single package.

Description Tgz File Size (GB) Zip File Size (GB)
All Data Download 13.0 Download 13.0
Normal (No fault) Download 0.3 Download 0.3
Horizontal Misalignment Download 1.4 Download 1.4
Vertical Misalignment Download 2.1 Download 2.1
Imbalance Download 2.3 Download 2.3
Underhang Bearing Download 3.7 Download 3.7
Overhang Bearing Download 3.4 Download 3.4

The database is composed by several CSV (Comma-Separated Values) files, each one with 8 columns, one column for each sensor, according to:


MAFAULDA

SMT

Signals, Multimedia, and Telecommunications Laboratory

COPPE/Poli/UFRJ

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