# Research on Propagation Characteristics of Tire Cavity Resonance Noise in the Automobile Suspension
## 5 Conclusions  
In this research, the finite element model of a McPherson suspension system was established and the correctness of this model was verified by modal analysis. Finally, the power flow method was used to research the propagation characteristics of TCRN in the suspension system, and the propagation characteristics of TCRN at different running speeds, inflation pressures, and loads were obtained. The related conclusions are as follows:  
1. During the transmission of tire cavity resonance noise in a Y-spoke aluminum alloy wheel and suspension system, the power flow output by the lower arm front pushing is the largest and the power flow output by the rear bushing is the smallest. 2. The areas in the suspension system with high stress are located at the steering knuckle, lower swing arm, and shock absorber. With an increase in load, the stress and strain of a suspension system increase, and the structural sound intensity of the suspension system increases. 3. The output power flow of a suspension system decreases slightly with an increase in load. In our study, the output power flow of the suspension system was the largest when the inflation pressure was 0.22 MPa; the output power flow was relatively low under the other four inflation pressures. As the speed increased, the output power flow of the suspension system decreased slightly. Studying the propagation characteristics of tire cavity resonance noise in suspension systems can provide a basis for the design of wheels and suspension systems which could suppress the propagation of tire cavity resonance noise. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & & **Sum of** & & & **Power Flow** \\
**Speed Condition** & \begin{tabular}{c} **Structural** \\ **Sound Intensity** \\ **(10\({}^{-3}\) W/mm\({}^{2}\))** \\ \end{tabular} & \
\begin{tabular}{c} **Number of** \\ **Points** \\ **Area (mm\({}^{2}\))** \\ \end{tabular} &
\begin{tabular}{c} **Cross** \\ **of Cross** \\ **Section** \\ **(10\({}^{-3}\) W)** \\ \end{tabular} \\ \hline
20 km/h & \begin{tabular}{c} Input \\ Output \\ \end{tabular} & \begin{tabular}{c} 2.566 \(\times\) 10\({}^{-2}\) \\ 2.958 \(\times\) 10\({}^{-4}\) \\ \end{tabular} & \begin{tabular}{c} 15,064 \\ 2652 \\ \end{tabular} & \
\begin{tabular}{c} 81,367 \\ 11,180 \\ 11,180 \\ \end{tabular} &
\begin{tabular}{c} 1.386 \(\times\) 10\({}^{-1}\) \\ 1.247 \(\times\) 10\({}^{-3}\) \\ \end{tabular} \\ \hline
30 km/h & \begin{tabular}{c} Input \\ Output \\ \end{tabular} & \begin{tabular}{c} 2.635 \(\times\) 10\({}^{-2}\) \\ 2.894 \(\times\) 10\({}^{-4}\) \\ \end{tabular} & \begin{tabular}{c} 15,064 \\ 2652 \\ \end{tabular} & \
\begin{tabular}{c} 81,367 \\ 11,180 \\ \end{tabular} &
\begin{tabular}{c} 1.423 \(\times\) 10\({}^{-1}\) \\ 1.220 \(\times\) 10\({}^{-3}\) \\ \end{tabular} \\ \hline
40 km/h & \begin{tabular}{c} Input \\ Output \\ \end{tabular} & \begin{tabular}{c} 2.701 \(\times\) 10\({}^{-2}\) \\ 2.815 \(\times\) 10\({}^{-4}\) \\ \end{tabular} & \begin{tabular}{c} 15,064 \\ 2652 \\ \end{tabular} & \
\begin{tabular}{c} 81,367 \\ 11,180 \\ \end{tabular} &
\begin{tabular}{c} 1.459 \(\times\) 10\({}^{-1}\) \\ 1.187 \(\times\) 10\({}^{-3}\) \\ \end{tabular} \\ \hline
50 km/h & \begin{tabular}{c} Input \\ Output \\ \end{tabular} & \begin{tabular}{c} 2.782 \(\times\) 10\({}^{-2}\) \\ 2.722 \(\times\) 10\({}^{-4}\) \\ \end{tabular} & \begin{tabular}{c} 15,064 \\ 2652 \\ \end{tabular} & \
\begin{tabular}{c} 81,367 \\ 11,180 \\ \end{tabular} &
\begin{tabular}{c} 1.503 \(\times\) 10\({}^{-1}\) \\ 1.148 \(\times\) 10\({}^{-3}\) \\ \end{tabular} \\ \hline
60 km/h & \begin{tabular}{c} Input \\ Output \\ \end{tabular} & \begin{tabular}{c} 2.867 \(\times\) 10\({}^{-2}\) \\ 2.627 \(\times\) 10\({}^{-4}\) \\ \end{tabular} & \begin{tabular}{c} 15,064 \\ 2652 \\ \end{tabular} & \
\begin{tabular}{c} 81,367 \\ 11,180 \\ \end{tabular} &
\begin{tabular}{c} 1.549 \(\times\) 10\({}^{-1}\) \\ 1.107 \(\times\) 10\({}^{-3}\) \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}