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管阵流体弹性不稳定性研究及随机响应分析【作者】黄平 【导师】杜庆华; 王勖成

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管阵流体弹性不稳定性研究及随机响应分析水利论文R;M3oD,`6U+u!Z$X

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【作者】黄平导师杜庆华; 王勖成
b8F"W*M1@zo s4d1o0【作者基本信息】清华大学,固体力学,1989年,博士

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-U1V`+L$D`0【中文摘要】 本论文对管阵流体弹性不稳定性及其随机振动问题进行了较详细的研究。文章内容主要包括: (1).利用不稳定流理论模型开发了计算横向流下管阵临界流速的程序,并利用H.Tanaha等的实验数据对一些算例进行了计算和分析; (2).考虑了固有频率改变、计算时管数取值、纵向流存在以及U形管弯曲部分对流体弹性不稳定性的影响; (3).提出以频率为参数的拟线性模型来分析临界流速的多值性,并给出了计算固有临界流速和受激临界流速的方法; (4).通过分析已有的实验数据和资料,提出关于管阵间功率谱的一些假设进行流体随机激励下响应问题的计算; (5).考虑了非有效支承对临界流速的影响,提出对各阶失调频率进行概率分析,然后用概率计算临界流速期望值的方法; (6).考虑了因参数不确定性而引起的失调问题。给出了利用数值法,计算由于跨距变化而引起临界流速变化的概率分布的方法。 本文编制了两个主要计算程序:(1) 计算管阵的临界流速;(2) 求解随机激励下管阵的响应。在程序中,利用模态分析方法结合单一振型法和频率截断法对引起各阶振塑耦合的问题做了处理,使程序可以考虑流速沿轴向变化、失调问题、纵向流的存在以及U形管等问题...更多。  还原

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,qF:`8yqN?0【英文摘要】 The fluidelastic instable vibration and random vibration of tube arrays are studied in this dissertation. Its contents include:(1) Based on unsteady flow theory model, the program of calculating the critical velocity of fluidelastic instability is developed. And with the experiment data of H.Tanaka et al. , some examples are calculated and the results are discussed.(2) The detuning of the intrinsic frequency of tubes, the number of tubes in the calculation, axial-flow and the curvature of U-tubes, which influence on the critical velocity of tube arrays, are studied carefully.(3) The quasi-linear model using the frequency as the parameter is proposed to analyze the multiple-valued critical velocities and a method to calculate the intrinsic and excited critical velocities is given.(4) After some experiment data being analyzed, some hypotheses on the power spectrums of tube arrays are given in order to get the solution of responses of tubes excited by random forces of turbulence and vorte...更多x.(5) The influence of inactive supports on the critical velocity is discussed thoroughly, and after the relation between the critical velocity and vibration frequency is studied, a probabilistic method is put forward to estimate the expectancy of the critical velocity.(6) Numerical methods are used to take account of the influence on the critical velocity by disordered structures such as tube spans are changed due to manufacturing or assembling.Following are the two main computer programs developed : (1) to calculate the critical velocity, and (2) to calculate the responses of tubes. In these programs, modal analysis method are used to take account of the influences of non-uniform flow velocity distribution. And the single mode method or frequency truncation method is used to solve the problems when different modes are coupled with each other.  还原水利论文a z(L/R3fQ*F%m:f

!sJM`~9y0【中文关键词】 流体诱发振动; 流体弹性不稳定性; 管阵; 换热器水利论文_?W.i"{l9D
【英文关键词】 fluidelastic instability; flow-induced vibration; tube array; heat exchanger

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TAG: 不稳定性 杜庆华 管阵 流体 黄平
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