CAJ | 학술논문

在列车车轮表面喷涂阻尼材料可以降低车轮振动声辐射，通过试验调查喷涂阻尼厚度对其减振降噪性能的影响。在半消声室进行对比试验，测试了斜曲型辐板车轮在无阻尼、喷涂1 mm和2 mm情况下的振动声辐射，和双S型辐板车轮在无阻尼、喷涂1 mm和4 mm阻尼下的声辐射。测试结果表明：对于斜曲型辐板车轮，2 mm阻尼层对车轮的减振区域和减振量均优于1 mm阻尼层，在径向和轴向激励下，1mm阻尼层降噪量分别为2.0 dB(A)和1.0 dB(A)；对于双S型辐板车轮，在径向和轴向激励下，1 mm阻尼层降噪量分别为1.9 dB(A)和1.1 dB(A)。对于这两种辐板形式车轮，阻尼层增厚，降噪效果均增加。对于斜曲型车轮，在径向激励下阻尼具有更好的降噪效果，对于双S型车轮，在径向激励和轴向激励下阻尼降噪效果近似相同。
재열차차륜표면분도조니재료가이강저차륜진동성복사，통과시험조사분도조니후도대기감진강조성능적영향。재반소성실진행대비시험，측시료사곡형복판차륜재무조니、분도1 mm화2 mm정황하적진동성복사，화쌍S형복판차륜재무조니、분도1 mm화4 mm조니하적성복사。측시결과표명：대우사곡형복판차륜，2 mm조니층대차륜적감진구역화감진량균우우1 mm조니층，재경향화축향격려하，1mm조니층강조량분별위2.0 dB(A)화1.0 dB(A)；대우쌍S형복판차륜，재경향화축향격려하，1 mm조니층강조량분별위1.9 dB(A)화1.1 dB(A)。대우저량충복판형식차륜，조니층증후，강조효과균증가。대우사곡형차륜，재경향격려하조니구유경호적강조효과，대우쌍S형차륜，재경향격려화축향격려하조니강조효과근사상동。
Spraying damping materials on the surface of wheels is an effective measure to reduce vibration and sound radiation. In this paper, the influence of spread damping thickness on the vibration and sound radiation of a sprayed damping wheel is investigated experimentally. The comparative experiments are carried out in a semi-anechoic room. The vibration and sound radiation of obliquely curved wheel with 1 mm and 2 mm thick sprayed damping layers and without damping material are measured respectively. Then the sound radiation of a double-S shaped wheel with 1mm and 4 mm thick damping layers and without damping material is also measured respectively. The results show that the 2 mm thick damping material has better vibration absorption and noise reduction performance for the obliquely curved wheel than that of the one with 1mm thick damping layer. And the noise reductions of 1mm thick damping layer are 2.0 dB(A) and 1.0 dB(A) respectively under radial and axial excitations. For the double-S shaped wheel, the noise reductions of 1mm thick damping layer are 1.9 dB(A) and 1.1 dB(A) respectively under radial and axial excitations. Noise reduction increases as the thickness of the damping layer increases for the two types of wheels. For the obliquely curved wheel, the effects of sprayed damping layer are more effective under radial excitations. While for double-S wheel, the effects of the sprayed damping layer are almost the same under radial and axial excitations.