\documentclass[sn-mathphys,Numbered]{sn-jnl}
\usepackage{multirow}
begin{table*}[b]
\centering
\caption{Summary of Electrical and Mechanical Fault Detection Method}
\label{Table:1}
\begin{tabular}{ |p{1cm}|p{1.75cm}|p{4.5cm}|p{4cm}| }
\hline
\multicolumn{1}{|c|}{Fault Part} & \multicolumn{1}{|c|}{Fault Type} & \multicolumn{1}{|c|}{Fault Detection Method} & \multicolumn{1}{|c|}{Signal Analysis Technique} \\
\hline
\parbox[t]{1mm}{\multirow{18}{*}{\rotatebox[origin=c]{90}{Induction Motor
(Electrical Based Fault)}}} & \multicolumn{1}{c|}{\multirow{4}{*}{Broken Rotor Bar}} & Model Based Approach - DAE-SVM & Fast Fourier Transform
\\ \cline{3-4}
& &
MCSA & Wavelet Transform \newline{Stockwell Transform} \newline{Hilbert Transform} \newline{Short time Fourier Transform} \\ \cline{3-4}
& &
Improved Bare-Bones Particle Swarm Optimization & Multiple Signal Classification \& Discrete Fourier Transform \\ \cline{3-4}
& & Computing The Homogeneity and Kurtosis & Discrete Fourier Transform \\ \cline{2-4}
& \multirow{4}{*}{Bearing} &
MCSA & Wavelet Transform \newline{Stock well Transform} \newline {Hilbert Huang Transform} \\ \cline{3-4}
& & Vibration Measurements & Fast Fourier Transform \\ \cline{3-4}
& &
High Frequency Demodulation & Local Low Rank Matrix Approximation \newline{Fast Fourier Transform} \\ \cline{2-4}
& \multirow{4}{*}{Stator Winding} &Model Based Approach-Tacholess Order Tracking
& Fast Fourier Transform \\ \cline{3-4}
& &
Finite Element Analysis & Stockwell Transform \\ \cline{3-4}
& & Support Vector Machine (SVM) & Fast Fourier Transform \\ \cline{1-4}
\parbox[t]{1mm}{\multirow{18}{*}{\rotatebox[origin=c]{90}{ESP (Mechanical Based Fault)}}} & \multicolumn{1}{c|}{\multirow{4}{*}{Breakage (Shaft Failure)}} & Model Based Approach - DAE-SVM & Fourier Transform \\ \cline{3-4}
& &
MCSA & Wavelet Transform \newline{Stock well Transform} \newline {Hilbert Huang Transform} \\ \cline{3-4}
& &
Torsional Dynamic Stress Analysis & N/A \\ \cline{3-4}
& & Support Vector Machine & Fast Fourier Transform\\ \cline{2-4}
& \multirow{3}{*}{Impeller} &
MCSA & Wavelet Transform \newline{Stock well Transform \&} \newline {Hilbert Huang Transform\&}\newline {Modulation Signal Bispectrum} \\ \cline{3-4}
& & Adaptive Chirp Mode Decomposition (ADMD) & Instantaneous Frequency analysis \newline {Zero-Crossing Time (ZCT) Technique}
\\ \cline{3-4}
& &
High Frequency Demodulation & Fast Fourier Transform \\ \cline{2-4}
& \multirow{4}{*}{Leakage}
&Downhole Sensor& N/A \\ \cline{3-4}
& &
Principal Component Analysis & Artificial Neural Network \\ \cline{3-4}
& & Mahalonobis Distance& N/A \\ \cline{3-4}
\hline
\end{tabular}
\end{table*}
\end{document}