Abstract

This paper describes a numerical simulation of vibrations of an elastic rod whose height is significantly greater than its transverse dimension and which is placed perpendicularly to the external flow and rigidly mounted on a substrate. Simulation is carried out in the ANSYS software package using bidirectional coupling technology. The natural frequencies and vibration modes of the rod are calculated. The airflow structure is analyzed and its features in the vicinity of the model are described. The process of exciting the vibrations of an elastic rod under the action of an external flow is investigated and its stress-strain state is determined. Vibration modes in the direction of an incident flow and in the transverse direction are determined. It is shown that, if the first natural frequency and the vortex shedding frequency reach close values, the amplitude of the rod vibrations in the transverse direction sharply increases to a value approximately equal to 0.06 of the rod height, which is followed by natural vibrations with a constant amplitude in the transverse direction and variable amplitude in the direction of the incident flow.

中文翻译：

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对于接近共振模式的模式，高纵横比杆的气动弹性振动的直接数值模拟

摘要

本文描述了弹性杆的振动数值模拟，该杆的高度明显大于其横向尺寸，并且垂直于外部流动放置并刚性安装在基板上。仿真是在 ANSYS 软件包中使用双向耦合技术进行的。计算杆的固有频率和振动模式。分析了气流结构并描述了其在模型附近的特征。研究了弹性杆在外流作用下的振动过程，并确定了其应力应变状态。确定入射流方向和横向的振动模式。结果表明，如果第一固有频率和涡旋脱落频率接近，则