振动模态识别技术在输电塔线动力特性研究中的应用

输电塔线体系是一种复杂的空间塔线耦联振动体系,体系动力特性计算中由于导地线的振型密集,输电塔的振型难以清辨。在对输电塔线体系的动力特性研究中,采用白噪声激励体系,得到输电塔耦合了导地线的响应;利用振动模态识别技术,可得到输电塔耦合了导地线的低阶模态。此外,在实际工程现场进行了环境振动测试,识别输电塔耦合了导地线的低阶模态,验证了数值计算模型和理论模态识别的正确性。

Application of Vibration Modal Identification in Dynamic Characteristics Research of Transmission Tower and Conductor

The transmission tower and conductor system is a 3-dimensional complicated tower-line coupled vibration system, analytical data indicates that the vibration mode of the transmission lines tower is extraordinary close and majority is the vibration modes of cables. In order to acquire an accurate vibration mode of transmission tower which coupled cables, the time-history responses of the tower is acquired by inputting White-noise wave. Firsty, by adopting vibration modal identification technology in frequency-domain, the vibration mode of tower coupled cable effects can be identified. Environmental vibration test was carried out at an engineering site, which further verified FEA model and vibration mode identified by theoretic analysis.