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用自激振动理论说明由冰引起的结构振动现象已得到越来越多的现场测试和模型实验的印证。冰力振子模型是在自激振动理论基础上提出的一种建议的计算模型,目的在于更合理地描述冰与结构之间的动力相互作用。本文叙述冰力振子模型的建立原则及其特性,并给出一单自由度系统的数值解。由本文的论述以及计算结果同现有模型实验结果的对比表明,冰力振子模型从冰与结构两者各自的动力特性出发,可以正确预测“频率锁定”的全过程,它同现有的其他模型相比,更接近于这种振动现象的物理本质。
Using self-excited vibration theory to explain the phenomenon of structural vibration caused by ice has been more and more confirmed by field tests and model experiments. The ice-force oscillator model is a proposed calculation model based on the theory of self-excited vibration. The purpose is to more reasonably describe the dynamic interaction between ice and structure. This paper describes the establishment principle and characteristics of the ice-force oscillator model, and gives a numerical solution of a single-degree-of-freedom system. The comparison between the discussion of this paper and the calculation results shows that the ice-force oscillator model can correctly predict the whole process of “frequency locking” based on the respective dynamic characteristics of ice and structure. The model is closer to the physical nature of this vibration phenomenon.