【摘要】：隨著我國(guó)高速鐵路的發(fā)展,列車運(yùn)行速度越來(lái)越快,同時(shí)鐵路橋梁的跨度也越來(lái)越大,在自然風(fēng)的作用下,車橋系統(tǒng)的動(dòng)力作用將越來(lái)越明顯。為了提高列車通過(guò)橋梁時(shí)的安全性,有必要對(duì)車橋系統(tǒng)進(jìn)行更加精細(xì)化的研究。抖振是自然風(fēng)中的脈動(dòng)成分引起的一種限幅振動(dòng),列車高速通過(guò)橋梁時(shí),過(guò)大的振動(dòng)雖不能帶來(lái)致命的危險(xiǎn),但也會(huì)使乘客的舒適性大打折扣。基于此本文對(duì)車橋系統(tǒng)抖振力的一些關(guān)鍵參數(shù)進(jìn)行了試驗(yàn)研究。本文采用理論分析和風(fēng)洞試驗(yàn)相結(jié)合的方法,以一大跨鐵路桁架橋?yàn)楸尘?測(cè)量了車橋系統(tǒng)中列車的三分力系數(shù)、研究了紊流風(fēng)作用下列車斷面氣動(dòng)力的跨向相關(guān)性,并識(shí)別出了列車的氣動(dòng)導(dǎo)納,提出了列車氣動(dòng)導(dǎo)納的經(jīng)驗(yàn)公式。本文主要研究?jī)?nèi)容如下：1)介紹了橋梁的風(fēng)致振動(dòng)現(xiàn)象,回顧了氣動(dòng)導(dǎo)納的研究現(xiàn)狀并對(duì)列車氣動(dòng)力的研究?jī)?nèi)容進(jìn)行了說(shuō)明。2)對(duì)大氣邊界層的紊流特性進(jìn)行了描述,在風(fēng)洞中模擬了兩種紊流場(chǎng),分析了模擬紊流場(chǎng)的紊流特性。3)對(duì)列車的繞流進(jìn)行了說(shuō)明,分析了自然風(fēng)作用于車橋系統(tǒng)列車上的定常氣動(dòng)力和非定常氣動(dòng)力。在風(fēng)洞中對(duì)車橋系統(tǒng)節(jié)段模型進(jìn)行了測(cè)力試驗(yàn),同時(shí)也進(jìn)行了CFD數(shù)值計(jì)算,獲得了考慮橋梁影響的列車和橋梁的三分力系數(shù)。4)采用測(cè)壓法測(cè)量了車橋系統(tǒng)列車斷面表面的脈動(dòng)壓力,獲得了列車斷面的平均壓力分布和脈動(dòng)壓力分布特征。計(jì)算出了列車斷面的氣動(dòng)力,對(duì)列車斷面氣動(dòng)力的跨向相關(guān)性進(jìn)行了探討。5)采用等效氣動(dòng)導(dǎo)數(shù)法對(duì)車橋系統(tǒng)列車斷面的氣動(dòng)導(dǎo)納進(jìn)行了識(shí)別,分析了氣動(dòng)導(dǎo)納的影響因素,對(duì)列車斷面的氣動(dòng)導(dǎo)納進(jìn)行了曲線擬合,提出了列車抖振力氣動(dòng)導(dǎo)納的經(jīng)驗(yàn)公式。
[Abstract]:With the development of high-speed railway in China, the speed of train running is getting faster and faster, and the span of railway bridge is becoming larger and larger. Under the action of natural wind, the dynamic effect of vehicle-bridge system will be more and more obvious. In order to improve the safety of the train passing through the bridge, it is necessary to do more detailed research on the bridge system. Buffeting is a kind of limiting vibration caused by the pulsating component of natural wind. When the train passes through the bridge at high speed, the excessive vibration will not bring fatal danger, but it will also make the passenger's comfort greatly reduced. Based on this, some key parameters of buffeting force of vehicle-bridge system are studied experimentally. In this paper, using the method of theoretical analysis and wind tunnel test, taking a large span railway truss bridge as the background, the three-point force coefficient of the train in the vehicle-bridge system is measured, and the cross-direction correlation of the cross-section aerodynamic force of the train under the action of turbulent wind is studied. The aerodynamic admittance of train is identified and the empirical formula of train pneumatic admittance is put forward. The main contents of this paper are as follows: 1) the wind-induced vibration of the bridge is introduced, the research status of aerodynamic admittance is reviewed and the research content of train aerodynamic force is explained. 2) the turbulent characteristics of the atmospheric boundary layer are described. In the wind tunnel, two kinds of turbulent flow fields are simulated, and the turbulent characteristics of the simulated turbulence field are analyzed. 3) the flow around the train is explained, and the steady and unsteady aerodynamic forces acting on the train in the vehicle-bridge system are analyzed. In the wind tunnel, the model of the vehicle-bridge system is tested by force measurement, and the CFD numerical calculation is also carried out. The three-point force coefficients of the train and the bridge considering the influence of the bridge are obtained. 4) the fluctuating pressure on the surface of the train section of the vehicle-bridge system is measured by using the pressure measurement method, and the average pressure distribution and the fluctuating pressure distribution characteristics of the train section are obtained. The aerodynamic force of the train section is calculated, and the cross-direction correlation of the aerodynamic force of the train section is discussed. 5) the aerodynamic admittance of the train section of the vehicle-bridge system is identified by using the equivalent aerodynamic derivative method, and the influencing factors of the aerodynamic mobility are analyzed. The aerodynamic admittance of train section is fitted by curve, and the empirical formula of aerodynamic admittance of train buffeting force is proposed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3

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本文編號(hào)：2382666