| 无风环境下振动薄平板断面的非线性气动效应研究 |
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| 引用本文： | 应旭永,张哲.无风环境下振动薄平板断面的非线性气动效应研究[J].振动与冲击,2020,39(8):239-244. |
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| 作者姓名： | 应旭永 张哲 |
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| 作者单位： | 1.在役长大桥梁安全与健康国家重点实验室，南京211112;
2.苏交科集团股份有限公司，南京211112;
3.大连理工大学 土木工程学院，辽宁 大连116024 |
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| 基金项目： | 江苏省自然科学青年基金项目(BK20180150)。 |
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| 摘 要： | 基于随机拉格朗日-欧拉(ALE)法和弱耦合方法,建立了断面风振响应计算的数值模型。提出了无风环境下振动断面的气动力数学表达式,模拟了薄平板断面在无风环境下的自由振动响应,进而计算了断面的非线性振动频率和阻尼比。结果表明:提出的气动力模型能够有效的描述无风环境下作用在振动断面上的非定常气动力;无风环境下振动中的主梁断面,竖向振动比扭转振动对周围空气的干扰作用更大;若忽略无风环境下的气动效应,将会带来一定的误差;初始激励对无风环境下主梁断面的气动效应有较大的影响。
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| 关 键 词： | 无风环境 薄平板断面 非线性气动效应 计算流体力学(CFD) |
A study on nonlinear aerodynamic effect of a vibrating thin plate section in windless condition |
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| YING Xuyong,ZHANG Zhe.A study on nonlinear aerodynamic effect of a vibrating thin plate section in windless condition[J].Journal of Vibration and Shock,2020,39(8):239-244. |
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| Authors: | YING Xuyong ZHANG Zhe |
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| Affiliation: | 1.State Key Laboratory of Safety and Health for In-Service Long Span Bridges, Nanjing 211112, China;
2.Jiangsu Transportation Institute Co.，Ltd., Nanjing 211112, China;
3.School of Civil Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | Based on an arbitrary lagrange-euler (ALE) method and a weak coupled method, a numerical model for calculating the wind-induced response of section was developed.The mathematical expression of aerodynamic forces for vibrating section in windless condition is proposed.The free vibration response of a thin plate section in windless condition was simulated, and the nonlinear vibration frequency and damping ratio were calculated.The results indicate that the unsteady aerodynamic forces acting on vibrating section in windless condition can be effectively described by the presented aerodynamic force model.For the vibrating section in windless condition, the interference to the ambient air for the vertical motion is larger than that for torsional motion.The aerodynamic effect of vibrating section in windless condition cannot be neglected; otherwise, the error will be increased.The free vibration response of thin plate section in windless condition is significantly influenced by initial excitation. |
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| Keywords: | windless condition thin plate section nonlinear aerodynamic effect computer fluid dynamics(CFD) |
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