A Study on the Generating Mechanism of Elevated Structure Noise and Its Countermeasures

高架结构噪声产生机理及对策研究

• 批准号: 06452293
• 负责人: MORIMOTO Masayuki
• 金额: $ 1.28万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452293/
• 关键词: elevated structure noise; elevated motor way; sound radiation; noise control; vibration; model analysis; boundary element analysis; 高架構造物; 桁

The problems with the elevated structure noise, which is the noise in audio-frequency range radiated from the structural elements of the elevated motorway, recently arises around the elevated motorways. To investigate the mechanism of the generation of, and to establish the countermeasure to the elevated structure noise, the following considerations were carried out :1. Model analysis of the acoustic radiation of steel I-beams : The sound radiation characteristics of web plate of steel I-beams were analyzed using a simplified model. The beam was modelled a baffled strip of elastic plate of infinite length in the model analysis. The features of the calculated results were discussed in comparison with those of those of the actual elevated structure noise in order to shed some light on the main cause of the noise.2. Boundary element analysis of the vibration of steel I-beams : To make a further investigation on the main cause of the noise, vibration of a steel I-beam was analyzed by bound … More ary element method (BEM). The relationship between the elevated structure noise and the structure of the beam was discussed in detail from the above BEM results.As the results from the model analysis, the radiated sound from an elastic plate strip of infinite length was found to have very similar features to the elevated structure noise. This can be interpreted to imply that steel I-beams can possibly be the main cause of the elevated structure noise. The results of the BEM analysis show that the transverse vibration, which may be the most responsible to sound radiation, is dominant in the web plate around 500Hz, and it is still dominant when the web is excited by a nearly in-plane force. These results suggest that the web plate of steel I-beams is strongly relevant to the elevated structure noise. From the above results, it can be concluded that the main cause of the elevated structure noise is the web plate of steel I-beams. Though there is still some problems to be solved, which include the actual excitation condition of the beam, for example, the above results can help with basic ideas for countermeasures to the elevated structure noise problems. Less

高架结构噪声是指高架道路结构元件辐射的音频范围内的噪声，是近年来在高架道路周围出现的问题。为了研究高架结构噪声的产生机理，制定高架结构噪声的防治措施，本文进行了以下几方面的研究：1。工字钢梁声辐射模态分析：采用简化模型分析了工字钢梁腹板的声辐射特性。在模态分析中，梁被模拟为无限长的弹性板的折流板条。通过与实际高架结构噪声计算结果的比较，分析了计算结果的特点，揭示了高架结构噪声产生的主要原因.工字钢梁振动的边界元分析：为了进一步研究噪声产生的主要原因，采用边界元法对工字钢梁的振动进行了分析 ...更多信息 元法（BEM）。从边界元法的结果出发，详细讨论了高架结构噪声与梁结构的关系，并通过模态分析发现，无限长弹性板带的辐射声与高架结构噪声具有非常相似的特征。这可以解释为意味着钢工字梁可能是高架结构噪音的主要原因。边界元分析结果表明，在500Hz附近，腹板的横向振动占主导地位，这可能是声辐射的主要原因，当腹板受到近面内力激励时，横向振动仍占主导地位。这些结果表明，腹板的工字钢是强烈相关的高架结构噪声。由以上结果可知，高架结构噪声的主要原因是工字钢腹板。虽然仍有一些问题需要解决，例如梁的实际激励条件，但上述结果可以为高架结构噪声问题的对策提供基本思路。少

项目成果

北村泰寿: "鋼桁に発生する高次振動の境界要素解析" 建設工学研究所報告. 37. 17-26 (1995)

Yasutoshi Kitamura：“钢梁高阶振动的边界元分析”建筑工程研究所报告37. 17-26（1995）。

Kimihiro SAKAGAMI,et al.: "Acoustic radiation from a baffled elastic plate strip of infinite length" Memoirs of the Faculty of Engineering, Kobe University. No.42. 13-27 (1995)

Kimihiro SAKAGAMI 等人：“无限长度的带挡板弹性板条的声辐射”神户大学工学院回忆录。

阪上公博: "Acoustic Radiation from a Baffled Elastic Plate strip of Infinite Length" Memoirs of the Faculty of Engineering, Kobe University. 42. 13-27 (1995)

Kimihiro Sakagami：“无限长度的挡板弹性板带的声辐射”神户大学工程学院回忆录 42. 13-27 (1995)。

北村康寿: "鋼桁に発生する高次振動の境界要素解析" 建設工学研究所報告. 37. 17-26 (1995)

Yasutoshi Kitamura：“钢梁中发生的高阶振动的边界元分析”建筑工程研究所报告37. 17-26 (1995)。

Yasutoshi KITAMURA and Shinji FUJIWARA: "Boundary element analysis on vibration of steel I-beam in high frequencies" Research Report of Construction Engineering Research Institute Foundation. No.36. 17-26 (1995)

Yasutoshi KITAMURA和Shinji FUJIWARA：“工字钢高频振动的边界元分析”建筑工程研究基金会的研究报告。