1.1.Introduction

该数据库由SpectraQuest的机械故障模拟器（MFS）校准平衡振动（ABVT）上的传感器采集的1951个多变量时间序列组成。1951包括六种不同的模拟状态：正常功能、不平衡故障、水平和垂直错位故障以及内外轴承故障。本节介绍数据库。

1.2.Experimental Bench Specifications

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

1.3.Data Acquisition System

• Three Industrial IMI Sensors, Model 601A01 accelerometers on the  radial, axial and tangencial directions:

  
  

• Sensibility
       (±20%) 100 mV per g (10.2 mV per m/s²);

• Frequency range
       (±3 dB) 16-600000 CPM (0.27-10.000 Hz);

• Measurement range
       ±50 g (±490 m/s²).

• One IMI Sensors triaxial accelerometer, Model 604B31, returning data  over the radial, axial and tangencial directions:

  
  

• Sensibility
       (±20%) 100 mV per g (10.2 mV per m/s²);

• Frequency range
       (±3 dB) 30-300000 CPM (0.5-5.000 Hz);

• Measurement range
       ±50 g (±490 m/s²)

• Monarch Instrument MT-190 analog tachometer

• Shure SM81 microphone with frequency range of 20-20.000 Hz

• Two National Instruments NI 9234 4 channel analog acquisition    modules, with sample rate of 51.2 kHz

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:

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.

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.

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.

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.

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

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

The underhang has a total of 558 sequences.

Overhang

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

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

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

The overhang sequences totaling 513.

2. Machinery Fault Database