薄膜结构风致振动研究进展

薄膜结构具有质量轻、刚度小、自振频率低的特点 ,因而属于风敏感结构。作用在薄膜结构上的风荷载 ,除与气流本身的特性有关外 ,还与结构在风荷载作用下的位移、速度、加速度等有关 ,从而引起附加的气动力。因此 ,在研究薄膜结构的风致振动时 ,必须考虑流固耦合作用。笔者对薄膜结构的风振研究方法进行了总结 ,主要介绍了简化气弹力学模型方法及简化流体力学解析模型方法 ,并分别用于分析小于临界风速时结构的反应和确定结构的颤振临界风速。

Progress in Research of Wind-induced Vibration of Membrane Structures

With light mass, small stiffness and low natural frequency, membrane structures are sensitive to wind. The wind pressure acting on a membrane structure is relative to the structural displacement, velocity and acceleration as well as the characteristics of airflow itself. So the additional aerodynamic forces are induced. Therefore, the fluid structure interaction must be considered in the analysis of wind induced response of the membrane structures. The research methods of wind induced vibration of membrane structures are summarized, and two methods are mainly introduced. One is the simplified aeroelastic model, which is used to analyze the wind induced response of the membrane structures under the action of wind less than the critical velocity. And the other is the simplified fluid mechanics analytical model, which is used to determine the flutter critical wind velocity.