## 4 Model Recognition in Volume Source Mode
(**a**) Volume sound source of internal sound field; (**b**) Cockpit test; (**c**) Engine room test; (**d**) Vehicle measuring point layout. to, in addition to the individual frequency maximum error is less than 3 dB. The results show that the test-measured SEA parameters and acoustics parameters are used to fix the hybrid model using the in-vehicle hybrid FE-SEA high-frequency simulation analysis. This method is accurate and reliable. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Analysis Frequency**} & \multicolumn{2}{c}{**Simulation (dB)**} & \multicolumn{2}{c}{**Test (dB)**} & \multirow{2}{*}{**Error Value (dB)**} \\ \cline{2-3} \cline{5-5}  & **Engine Nacelle-Driver’s Ear** & & & \\ \hline
400 & 39.19 & 34.67 & 4.51 \\
500 & 40.42 & 39.25 & 1.17 \\
630 & 41.44 & 39.01 & 2.43 \\
800 & 43.17 & 40.16 & 3.01 \\
1000 & 44.78 & 48.81 & \(-\)4.03 \\
1250 & 46.64 & 47.81 & \(-\)1.17 \\
1600 & 48.33 & 48.08 & 0.26 \\
2000 & 50.10 & 51.55 & \(-\)4.6 \\
2500 & 52.93 & 49.17 & 3.76 \\
3150 & 54.49 & 57.53 & \(-\)3.05 \\
4000 & 56.15 & 53.96 & 2.19 \\
5000 & 57.62 & 58.73 & \(-\)1.10 \\
6300 & 59.06 & 59.88 & \(-\)0.82 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Engine compartment excitation test results. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Analysis Frequency**} & \multicolumn{2}{c}{**Simulation (dB)**} & \multicolumn{2}{c}{**Test (dB)**} & \multirow{2}{*}{**Error Value (dB)**} \\ \cline{2-3} \cline{5-5}  & **Left Front Wheel-Near Driver’s Ear** & & & \\ \hline
400 & 40.67 & 38.01 & 2.66 \\
500 & 41.34 & 39.81 & 1.53 \\
630 & 41.48 & 39.07 & 2.41 \\
800 & 43.26 & 40.84 & 2.42 \\
1000 & 45.36 & 47.47 & \(-\)2.11 \\
1250 & 47.28 & 47.99 & \(-\)0.71 \\
1600 & 49.42 & 50.21 & \(-\)0.78 \\
2000 & 51.82 & 49.58 & 2.24 \\
2500 & 57.41 & 47.86 & 9.55 \\
3150 & 59.38 & 55.00 & 4.38 \\
4000 & 60.90 & 51.35 & 9.55 \\
5000 & 63.60 & 57.61 & 5.99 \\
6300 & 66.12 & 58.99 & 7.13 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Left front wheel drive test results. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Analysis Frequency**} & \multicolumn{2}{c}{**Simulation (dB)**} & \multicolumn{2}{c}{**Test (dB)**} & \multirow{2}{*}{**Error Value (dB)**} \\ \cline{2-3} \cline{5-5}  & **Right Front Wheel-Near Driver’s Ear** & & & \\ \hline
400 & 42.72 & 37.28 & 5.43 \\
500 & 42.87 & 41.57 & 1.30 \\
630 & 42.72 & 39.76 & 2.95 \\
800 & 44.21 & 37.03 & 7.18 \\
1000 & 46.14 & 44.55 & 1.59 \\
1250 & 47.98 & 46.35 & 1.63 \\
1600 & 50.08 & 46.83 & \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Analysis Frequency**} & \multicolumn{2}{c}{**Simulation (dB)**} & \multicolumn{2}{c}{**Test (dB)**} \\ \cline{2-3}  & **Left Rear Wheel-Middle Rear** & **Left Rear Wheel-Middle Rear** & **Error Value (dB)** \\ \hline
400 & 32.20 & 31.98 & 0.22 \\
500 & 35.90 & 35.84 & 0.06 \\
630 & 37.20 & 35.56 & 1.64 \\
800 & 38.40 & 40.74 & \(-\)2.34 \\
1000 & 40.80 & 43.80 & \(-\)3.00 \\
1250 & 43.70 & 45.50 & \(-\)1.80 \\
1600 & 45.90 & 46.10 & \(-\)0.20 \\
2000 & 47.70 & 49.70 & \(-\)2.00 \\
2500 & 49.30 & 52.10 & \(-\)2.80 \\
3150 & 51.80 & 53.80 & \(-\)2.00 \\
4000 & 55.10 & 55.50 & \(-\)0.40 \\
5000 & 57.70 & 58.50 & \(-\)0.80 \\
6300 & 59.00 & 60.20 & \(-\)1.20 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Right rear wheel excitation test results. Figure 13: _Cont._