后临界湍流区间内旋转薄壳结构振动演化与作用机制实测研究

王浩; 柯世堂

doi:10.6052/0459-1879-18-125

后临界湍流区间内旋转薄壳结构振动演化与作用机制实测研究

doi: 10.6052/0459-1879-18-125

王浩,
柯世堂^2),

南京航空航天大学航空宇航学院,南京210016

基金项目: 1)国家重点基础研究发展计划(2014CB046200),国家自然科学基金(51878351,51761165022,U1733129),江苏省优秀青年基金(BK20160083),江苏省六大人才高峰高层次人才计划(JZ-026)和江苏省研究生科研与实践创新计划(KYCX18_0244)资助项目.

详细信息

作者简介:
作者简介: 2)柯世堂,教授,主要研究方向：风工程与结构工程.E-mail: keshitang@163.com

中图分类号: TU279.7$^+$41;
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出版历程
- 刊出日期: 2019-01-18

EVOLUTION CHARACTERISTIC AND WORKING MECHANISM ANALYSIS OF ROTATING THIN-WALLED STRUCTURES IN POST-CRITICAL TURBULENT INTERVAL BASED ON FIELD MEASUREMENT

Wang Hao,
Ke Shitang^{2)
,}

College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

摘要

摘要: 载荷的时变特征可能会对结构振动强度和能量作用机理产生重要影响,火/核电厂最重要的大型建筑结构均为典型的旋转薄壳结构(如冷却塔、烟囱等).为揭示后临界湍流区间内旋转薄壳结构的振动演化特征及其作用机制,实测了后临界雷诺数($Re\ge $3.5$\times $10$^{6}$)条件下8座典型旋转薄壳结构的振动响应.首先,在对实测响应进行降噪滤波处理后进行了不同时距的信号非平稳识别,基于非平稳分析模型对响应的时变均值和极值估计进行研究,并基于多尺度小波变换的演化谱方法开展了响应的频域演变特性研究.在此基础上,探讨了结构风振响应的共振分量占比及其效应,识别了结构的自振频率和阻尼比,并以结构基频为划分依据分别讨论了不同旋转薄壳结构的阻尼作用机制.研究结果表明：(1)旋转薄壳结构在后临界湍流区间内风致振动响应表现为强度非平稳、频率平稳的演化特性;(2)后临界湍流区间内的旋转薄壳结构的风振问题应区分准静力作用点与共振激发点分别进行研究,不同共振激发点的功率谱分布形式较为相近,而准静力作用点的功率谱分布规律差异较大;(3)共振激发点的振动能量分布呈现明显的分段趋势,基于本文大量实测分析结果回归得出适用于共振激发点的三阶段共振谱表达式;(4)借助本文提出的等效阻尼比概念拟合出此类结构的阻尼比预测公式,论证了目前工程中通用的5%阻尼比取值的不合理性.
- 旋转薄壳结构 /
- 后临界湍流区间 /
- 现场实测 /
- 振动演化 /
- 作用机制
Abstract: Recent study found that the time-varying characteristic of the load may have a significant effect on the vibrational strength and energy mechanism. The most important structures in fire/nuclear power plants (such as cooling towers, chimneys, etc.) are all typical rotating thin-walled structures. To reveal the vibration evolution characteristic and working mechanism of thin-walled structures in post-critical turbulent interval, the vibration responses of eight typical rotating thin-walled structures of high Reynolds number flow ($Re \ge $3.5$\times $10$^6$) are measured. Firstly, non-stationary identifications of signals with different time intervals are performed after depressing and filtering noise. The time-varying mean and extreme estimation of response are studied based on non-stationary analysis model. Besides, the frequency domain evolution characteristics are studied based on evolution spectrum method. On this basis, proportion of resonance component in wind-induced response and its effect are discussed. Then, self-resonant frequency and damping ratio of the structures are identified, and the damping mechanism of different rotating thin-walled structures is studied. The evolution characteristic and working mechanism are revealed as follows. (1) The wind-induced vibration response of the rotating thin-shell structure in post-critical turbulent interval is characterized by stable frequency evolution characteristics and non-stationary evolution characteristics in intensity aspect; (2) The wind-induced vibration problem of rotating thin-walled structures in post-critical turbulent interval should be studied as quasi-static and resonance excitation points separately. The vibration energy distributions of resonance excitation points at different regions of the cooling tower were similar, but the PSD functions of quasi-static points were dramatically different from each other; (3) Vibration energy distribution of the resonant excitation points showed a phased trend, and the proposed resonance spectral expression takes three variation stages of responses into account and achieves high prediction accuracy; (4) With the concept of equivalent damping ratio proposed in this paper, the damping ratio prediction formula is proposed. More importantly, these analysis results show that resonance effects and non-stationary effects on wind-induced effects of rotating thin-walled structures in post-critical turbulent interval are generally notable, and the irrationality of 5% damping ratio value commonly used in the current project for this type of rotating thin-walled structure has been demonstrated.
- rotating thin-walled structures /
- post-critical turbulent interval /
- field measurement /
- vibration evolution /
- working mechanism

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参考文献(1)

[1]	Bamu PC, Zingoni A.Damage, deterioration and the long-term structural performance of cooling-tower shells: A survey of developments over the past 50 years. Engineering Structures, 2005, 27(12): 1794-1800
[2]	Zdravkovich MM, Bearman PW.Flow around circular cylinders-volume 1: Fundamentals. Journal of Fluids Engineering, 1998, 120(1): 105-106
[3]	Ke ST, Ge YJ.The influence of self-excited forces on wind loads and wind effects for super-large cooling towers. Journal of Wind Engineering & Industrial Aerodynamics, 2014, 132: 125-135
[4]	Sun J, Xu X, Lim CW.Localization of dynamic buckling patterns of cylindrical shells under axial impact. International Journal of Mechanical Sciences, 2013, 66(4): 101-108
[5]	Noh HC.Nonlinear behavior and ultimate load bearing capacity of reinforced concrete natural draught cooling tower shell. Engineering Structures, 2006, 28(3): 399-410
[6]	柯世堂, 赵林, 葛耀君等. 大型双曲冷却塔气弹模型风洞试验和响应特性. 建筑结构学报, 2010, 31(2): 61-68
[6]	(Ke Shitang, Zhao Lin, Ge Yaojun, et al.Wind tunnel test on aeroelastic model of large hyperbolic cooling towers and features of wind-induced response. Journal of Building Structures, 2010, 31(2): 61-68(in Chinese))
[7]	周旋, 牛华伟, 陈政清等. 双冷却塔布置与山地环境风干扰作用效应研究. 建筑结构学报, 2014, 35(12): 140-148
[7]	(Zhou Xuan, Niu Huawei, Chen Zhengqing, et al.Study on interference effect of cooling towers under condition of tower-tower and hilly surroundings. Journal of Building Structures, 2014, 35(12): 140-148 (in Chinese))
[8]	及春宁, 陈威霖, 黄继露等. 串列双圆柱流致振动的数值模拟及其耦合机制. 力学学报, 2014, 46(6): 862-870
[8]	(Ji Chunning, Chen Weiling, Huang Jilu, et al.Numerical investigation on flow-induced vibration of two cylinders in tandem arrangements and its coupling mechanisms. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(6): 862-870(in Chinese))
[9]	Chen J, Hui MCH, Xu YL.A Comparative study of stationary and non-stationary wind models using field measurements. Boundary-Layer Meteorology, 2007, 122(1): 105-121
[10]	Tamura Y, Kareem A, Solari G, et al.Aspects of the dynamic wind-induced response of structures and codification. Wind & Structures An International Journal, 2005, 8(4): 251-268
[11]	程霄翔, 赵林, 葛耀君. 高超临界雷诺数区间内二维圆柱绕流的实测研究. 物理学报, 2016, 65(21): 232-247
[11]	(Chen Xiaoxiang, Zhao Lin, Ge Yaojun.Field measurements on flow past a circular cylinder in transcritical Reynolds number regime. Acta Physica Sinica, 65(21): 232-247(in Chinese))
[12]	Winney PE.The modal properties of model and full scale cooling towers, Journal of Sound & Vibration, 1978, 57(1): 131-148
[13]	Górski P.Investigation of dynamic characteristics of tall industrial chimney based on GPS measurements using random decrement method. Engineering Structures, 2015, 83: 30-49
[14]	GB 50009-2012 B 50009-2012. 建筑结构荷载规范. 北京: 中国建筑工业出版社, 2012
[14]	(GB 50009-2012 B 50009-2012. Load code for the design of building structures. Beijing: {China Building Industry Press, 2012(in Chinese))
[15]	Hu L, Xu YL.Extreme value of typhoon-induced non-stationary buffeting response of long-span bridges. Probabilistic Engineering Mechanics, 2014, 36(2): 19-27
[16]	康厚军, 郭铁丁, 赵跃宇. 大跨度斜拉桥非线性振动模型与理论研究进展. 力学学报, 2016, 48(3): 519-535
[16]	(Kang Houjun, Guo Tieding, Zhao Yueyu.Review on nonlinear vibration and modeling of large span cable-stayed bridge. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(3): 519-535(in Chinese))
[17]	Swartz SE, Chien CC, Hu KK, et al.Tests on microconcrete model of hyperbolic cooling tower. Experimental Mechanics, 1985, 25(1): 12-23
[18]	王杰方, 安海, 安伟光. 超空泡运动体圆柱薄壳的非线性动力屈曲分析. 力学学报, 2016, 48(1): 181-191
[18]	(Wang Jiefang, An Hai, An Weiguang.The nonlinear dynamic buckling analysis of a thin-walled cylindrical shell of supercavitating vehicles. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(1): 181-191(in Chinese))
[19]	徐万海, 马烨璇, 罗浩等. 柔性圆柱涡激振动流体力系数识别及其特性. 力学学报, 2017, 49(4): 818-827
[19]	(Xu Wanhai, Ma Yexuan, Luo Hao, et al.Identification and characteristics of hydrodynamic coefficients for a flexible cylinder undergoing vortex-induced vibration. Chinese Journal of Theoretical and Applied Mechanics, 2017, 49(4): 818-827(in Chinese))
[20]	Watson JN, Addison PS.Spectral-temporal filtering of ndt data using wavelet transform modulus maxima. Mechanics Research Communications, 2002, 29(2-3): 99-106
[21]	Bendat JS, Piersol AG.Random data: Analysis and measurement procedures. IEEE Transactions on Signal Processing, 2010, 58(7): 3938-3945
[22]	Daubechies I.Ten lectures on wavelets. Computers in Physics, 1992, 6(3): 1671-1671
[23]	Failla G, Spanos PD.Evolutionary spectra estimation using wavelets. Journal of Engineering Mechanics, 2004, 130(8): 952-960
[24]	Armitt JW.Wind loading on cooling towers. ASCE Journal of the Structural Division, 1980, 106(3): 623-641
[25]	Ibrahim SR.Random decrement technique for modal identification of structures. Journal of Spacecraft & Rockets, 2012, 14(11): 696
[26]	Kashani H, Nobari AS.Structural nonlinearity identification using perturbed eigen problem and ITD modal analysis method. Applied Mechanics & Materials, 2012, 232: 949-954
[27]	Moncayo H, Marulanda J, Thomson P.Identification and monitoring of modal parameters in aircraft structures using the natural excitation technique (NExT) combined with the eigensystem realization algorithm (ERA). Journal of Aerospace Engineering, 2010, 23(2): 99-104
[28]	Oppenheim AV, Willsky AS, Nawab SH. Signals & Systems (2nd ed.). Prentice-Hall, Inc. 1996
[29]	Kizilkaya A, Kayran AH.ARMA model parameter estimation based on the equivalent MA approach. Digital Signal Processing, 2006, 16(6): 670-681
[30]	Vargas-Loli LM, Fenves GL.Effects of concrete cracking on the earthquake response of gravity dams. Earthquake Engineering & Structural Dynamics, 2010, 18(4): 575-592