Industry 4.1. Группа авторов

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chapter; the detailed experimental data are uploaded in the IEEE DataPort for references.

Appendix 2.A ‐ Abbreviation List

AC	Alternating Current
ADC	Analog‐to‐Digital Converter
AE	Acoustic Emission
AEN	Autoencoder
AI	Artificial Intelligence
AIO	Analog Input / Output
ANN	Artificial Neural network
AOI	Automated Optical Inspection
CbM	Condition‐based Maintenance
CCD	Charge‐Coupled Device
CMM	Coordinate Measuring Machine
CNC	Computer Numerical Control
CPSs	Cyber‐Physical Systems
DC	Direct Current
DIO	Digital Input / Output
DNN	Deep Neural Network
DWT	Discrete Wavelet Transform
EtherCAT	Ethernet for Control Automation Technology
FFT	Fast Fourier Transform
FT	Fourier Transform
Industry 4.0	Fourth Industrial Revolution
IIoT	Industrial Internet of Things
MRA	Multi‐Resolution Analysis
MQTT	Message Queuing Telemetry Transport
NC	Numerical Control
OPC‐UA	Open Platform Communication Unified Architecture
PC	Personal Computer
PLC	Programmable Logic Controller
PM	Preventive Maintenance
RM	Reactive Maintenance
RF	Random Forest
rpm	rotation per minute
RUL	Remaining Useful Life
SFs	Signal Features
S/N	Signal‐to‐Noise
STFT	Short‐Time Fourier Transform
TCP/IP	Transmission Control Protocol/Internet Protocol
TFT‐LCD	Thin‐Film‐Transistor Liquid‐Crystal Display
WPT	Wavelet Packet Transform

Appendix 2.B ‐ List of Symbols in Equations

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F s	sampling rate for acquiring a signal
F B	highest frequency component contained in a signal
M	number of precision items
N	data length of discrete signals
s[i]	ith data point of a discrete signal
p	pth precision item		raw sensor data of pth precision item		cleaned sensor data of pth precision item
g[k]	DWT low‐pass filters
h[k]	DWT high‐pass filters
L	number of decomposition levels;
j	scale parameters
n	translation parameter
cj[n]	nth discrete wavelet coefficient of at level j		nth approximation coefficient at level j		nth detail coefficient at level j		nth modified wavelet coefficients at level j