【摘要】：為了探討列車(chē)通過(guò)軌道交通高架槽形梁時(shí)誘發(fā)的結(jié)構(gòu)噪聲,以某擬建30 m軌道交通槽形梁為研究對(duì)象,建立車(chē)橋耦合系統(tǒng)振動(dòng)分析模型以及槽形梁結(jié)構(gòu)聲輻射有限元/邊界元模型。采用多體動(dòng)力學(xué)軟件Simpack建立列車(chē)的空間動(dòng)力學(xué)模型,采用有限元軟件Ansys建立槽形梁有限元模型,基于Simpack和Ansys相結(jié)合的聯(lián)合仿真方法,獲取輪軌激振力。在計(jì)算列車(chē)荷載作用下槽形梁結(jié)構(gòu)振動(dòng)響應(yīng)的基礎(chǔ)上,采用有限元-間接邊界元耦合聲學(xué)分析法,探討底板厚度以及腹板高度對(duì)槽形梁結(jié)構(gòu)噪聲的影響。研究結(jié)果表明:底板厚度的增加可以降低槽形梁梁體正下方的結(jié)構(gòu)噪聲,但并非越厚越好,底板厚度對(duì)結(jié)構(gòu)遠(yuǎn)聲場(chǎng)有一定程度的影響,但降噪效果不明顯;腹板高度的變化使槽形梁結(jié)構(gòu)噪聲輻射衰減方向有所改變,橋梁腹板兩側(cè)噪聲輻射衰減速度較快;橋梁底板正上方的結(jié)構(gòu)輻射噪聲最強(qiáng)區(qū)域有縮小趨勢(shì);分析結(jié)果可為軌道交通槽形梁結(jié)構(gòu)減振降噪優(yōu)化設(shè)計(jì)提供一定的理論參考依據(jù)。
[Abstract]:In order to investigate the structural noise induced by the train passing through the elevated groove beam of rail transit, a 30 m rail transit slot beam is taken as the research object. The vibration analysis model of vehicle-bridge coupling system and the finite element / boundary element model of acoustic radiation of grooved beam structure are established. The spatial dynamic model of train is established by Simpack and the finite element software Ansys is used to establish the finite element model of grooved beam. Based on the combined simulation method of Simpack and Ansys, the exciting force of wheel and rail is obtained. Based on the calculation of vibration response of grooved beam structure under train load, the influence of the thickness of bottom plate and the height of web plate on the structural noise of grooved beam is discussed by using the coupled acoustic analysis method of finite element and indirect boundary element. The results show that the increase of the thickness of the bottom plate can reduce the noise directly below the beam body, but not the thicker the better, the thickness of the bottom plate has a certain degree of influence on the far sound field of the structure, but the effect of noise reduction is not obvious. The change of the height of the web makes the direction of the noise radiation attenuation of the grooved beam structure change, and the attenuation speed of the noise radiation on the two sides of the bridge web plate is faster, and the strongest region of the structure radiation noise above the bridge bottom plate has a tendency to shrink. The analysis results can provide a theoretical reference for the optimal design of vibration and noise reduction of grooved beam structure of rail transit.
【作者單位】： 華東交通大學(xué)鐵路環(huán)境振動(dòng)與噪聲教育部工程研究中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51268014,51578238) 江西省“贛鄱英才555工程”領(lǐng)軍人才培養(yǎng)計(jì)劃資助項(xiàng)目
【分類(lèi)號(hào)】：U441.3

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