Field Measurements for Traffic Noise Reduction in Highway Tunnels Using Closed-Cell Aluminum Foam Board

Zanquan Lin,Weipeng Gong,Binbin Zhu,Jiajia Shen,Juan Huang,Hu Zhang,Li Wan

doi:10.3390/app12020538

Abstract

In order to explore the sound absorption and noise reduction performance of closed-cell aluminum foam in the tunnel, the field test of the sound absorption performance of aluminum foam board was carried out based on the installation of aluminum foam board in the whole line of Haoshanyu Tunnel on Qinglan Expressway. Combined with the existing loudspeaker test and typical tunnel measurements, a new field test method for the noise reduction performance of closed-cell aluminum foam board was proposed for two different working conditions including fixed-point pure tone sound source condition and mobile vehicle sound source condition. The testing results of the new methods were analyzed, and it showed that the closed-cell aluminum foam has good sound absorption property at the frequency spectra between 250 Hz and 1000 Hz, and the farther away from the sound source, the better the sound absorption effect. In the research on the noise reduction effect of actual vehicle, it was found that the insertion loss of the closed-cell foam aluminum board is about 4 dB(A), which indicated that the closed-cell aluminum foam can play a certain noise reduction effect in the tunnel.

Highlights

Academic Editor: Daniel DiasNoise pollution has attracted more and more people’s attention
This paper evaluates the effect of closed-cell aluminum foam boards in tunnel noise reduction under two different working conditions, and obtains the noise reduction effect of fixed pure sound sources and moving vehicle noise in the tunnel, which can provide theoretical basis for the promotion of closed-cell aluminum foam in tunnel application
We willgave analyze results measured by the above work method, and explain the sound absorption effects of the closed-cell aluminum foam board ing conditions

Summary

Introduction

Academic Editor: Daniel DiasNoise pollution has attracted more and more people’s attention. The noise pollution in the tunnel is serious. Tunnel construction in China has developed rapidly. There were 21,316 graded highway tunnels with a total length about. Compared with the previous two years, the number of graded highway tunnels increased by 40% and 49% respectively. More and more tunnels were constructed at a complex environment [1,2,3]. While the tunnel construction is highly developed, the noise pollution problem in the tunnel has become more serious. Due to the closed environment of the tunnel, the noise generated during the driving process is difficult to dissipate, seriously affecting the driver’s comfort [4], and causing harm to the staff on the shoulder

Methods

Results

Conclusion