FUNDAMENTAL RESEARCH ON IMPACT RESPONSE AND IMPACT SOUND GENERATION OF BRIDGE SLABS

桥板冲击响应及冲击声产生的基础研究

• 批准号: 13650534
• 负责人: MIZUSAWA Tomisaku
• 金额: $ 1.79万
• 依托单位: DAIDO INSTITUTE TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650534/
• 关键词: IMPACT SOUND; GENERATION OF IMPACT SOUND; IMPACT RESPONSE; ACOUSTIC PROPERTIES; RESUILUAL SOUND; CORE ; LATION ON VIBRATION AND SOUND; ACOUSTIC SPECTRUM; ENVELOP OF FREQUENCY SPECTRAM; 周波数スペクトルエンベローブ勾配; 音響インテンシティ; 衝撃応答の発生機構; 曲げ波の伝播特性

(a) IMPACT RESPONSE AND GENERATION OF IMPACT SOUND OF PLATES DUE TO COLLING BODYThis report presents the impact response of rectangular Mindlin plates subjected to colliding of a steel ball by using the eigenfunction expansion method and the Hertz's law of contact. The effects of impact force, contact time and material properties on the generation mechanism of impact response and the characteristics of propagation of flexural waves have been investigated. It is seen that the initial impact response of steel plates and wooden plates subjected to a colliding steel ball shows some different mechanism on the wave propagation. Beside the difference of mechanism of impact response generation, the sound pressure calculated by the present method on the assumption of plane wave shows good agreement of the acoustically experimental result.(b) RADIATION MECHANISM AND TIMBRE OF IMPACT SOUND OF PLATES DUE TO COLLING BODYImpact response and radiation of impact sound generated from bridge slabs and its joints under the action of moving vehicles have been one of the environmental noise problems. In view of troublesome nature of impact sound, several authors reported a series of studies on impact noise. However, attention was given to the radiation of residual sound after the impact of a body and a plate. In this report, the radiation mechanism and timbre of impact sound generated from plates subjected to colliding spherical bodies by the acoustic experiment are investigated. The effects of geometric and material properties of plates and spherical bodies on frequency spectrogram of sound pressure have been clarified, and the correlation between frequencies of vibrating plates and impact sound caused from plates due to colliding spherical bodies are also investigated.

(a)本文用本征函数展开法和赫兹接触定律研究了矩形Mindlin板在钢球碰撞下的冲击响应。研究了冲击力、接触时间和材料特性对冲击响应产生机理和弯曲波传播特性的影响。结果表明，钢板和木板在钢球碰撞下的初始冲击响应对波的传播有不同的影响。除了冲击响应产生机理的差异外，在平面波假设下用本文方法计算的声压与声学实验结果吻合较好。(b)桥梁板受冷冲击声的辐射机理与时间桥梁板及其接缝在车辆行驶作用下产生的冲击声的响应与辐射一直是环境噪声问题之一。鉴于冲击声的恼人性质，一些作者报道了一系列关于冲击噪声的研究。然而，人们注意到了物体和板碰撞后的残余声辐射。本文通过声学实验研究了平板与球体碰撞产生的声辐射机理和音质。阐明了板和球的几何和材料特性对声压频谱图的影响，并研究了板振动频率与板与球碰撞声的相关性。

项目成果

Tomisaku MIZUSAWA: "Vibration of completely free plates using the spline element method"2002 Annual Conference of the Chubu Branch of the Japan Society of Civil Engineers. I-33. 65-66 (2003)

Tomisaku MIZUSAWA：“使用样条单元法的完全自由板的振动”2002年日本土木工程学会中部分会年会。

近藤八重: "鋼球の衝突を受ける平板の衝撃応答の発生機構と曲げ波の伝播特性"応用力学論文集. Vol.5. 83-91 (2002)

近藤八重：“钢球撞击平板中弯曲波的产生机制和传播特性”应用力学杂志第 5 卷 83-91 (2002)。

Yae KONDO: "Assessment indexes on timbre of impact sound generated from plates due to a colliding body"2002 Annual Conference of the Chubu Branch of the Japan Society of Civil Engineers. I-34. 67-68 (2003)

近藤八重：“由于碰撞体而产生的板碰撞声音色的评价指标”日本土木学会中部分会2002年年会。

河原田豊: "鋼球の衝突を受ける板の衝撃音に関する基礎的研究"土木学会第57回年次学術講演会講演概要集. I-200. 399-400 (2002)

Yutaka Kawarada：“钢球撞击板材的冲击声的基础研究”日本土木工程师学会第 57 届学术年会摘要 I-200（2002 年）。

水澤富作: "Spline要素法を用いた周辺自由な平板の振動解析"平成14年度土木学会中部支部研究発表会講演概要集. I-33. 65-66 (2003)

Tomisaku Mizusawa：“使用样条单元法对具有自由环境的平板进行振动分析”2002 年日本土木工程师学会中部分会研究报告摘要 I-33（2003 年）。