In order to investigate effects of reflector on insertion loss of a U-beam’s adhesive sound-absorbing material, an analog reflector was constructed for tests based on the outline of a train car. The test results were analyzed using the sound line theory. It was shown that when a reflector exists, noise within medium and high frequency ranges after repeated reflections between reflector and a U-beam’s adhesive sound-absorbing material gradually dissipates energy, the insertion loss increases; in the noise sensitive area outside the U-beam, the insertion loss during reflector existing is significantly larger than that be during absence of reflector; the 1/3 octave insertion loss curve for each measured point reveals the existence of reflector has a larger influence on noise within medium and high frequency ranges but a less influence on noise within a lower frequency range. This study provided a reference for evaluating the actual noise reduction effect of a certain newly developed adhesive sound-absorbing material used at the inner side of a U-beam’s web.
吴波波，王高沂，李海霞，任重义，韩西明. 反射体对U型梁贴附式吸声材料插入损失影响的实验研究[J]. 振动与冲击, 2018, 37(9): 239-242.
WU Bobo，WANG Gaoyi，LI Haixia，REN Zhongyi，HAN Ximing. Tests for influences of reflector on insertion loss of a U-beam’s adhesive sound-absorbing material. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(9): 239-242.
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