桅杆模型中纤绳初张力识别

桅杆有限元模型一般用实测平衡张力作为纤绳的初张力,研究表明这种做法对桅杆振动特性的影响不可忽略,有必要对有限元模型中纤绳初张力进行识别。针对实测数据可能少于、恰好或多于能确定纤绳初张力所需数目等3种情况,分别给出了纤绳初张力的识别方法,并结合算例对方法进行了验证,结果表明其方法执行效率高,提高了桅杆有限元分析的准确性。

Identification of Cable Initial Tension in the Model of Guyed Masts

Cable equilibrants measurements are usually used as the initial tensions in establishing FEM model of guyed masts. An example study of a guyed raast shows that there is distinct difference in the structure dynamic characteristics. Identification of cable initial tensions in FEM is necessary for improving numerical analysis. The different identification methods for three possible cases, in which the test data may be less, equal or more than what is needed to fix the initial tensions,are developed. Examples are employed to verify the proposed methods. The results show that the methods are highly robust with the numerical analysis of FEM improved.