基础刚度对天线结构系统固有频率的影响

Influence of Foundation Stiffness on Inherent Frequency of Antenna Structure System

在天线结构系统设计中,为了提高结构系统的固有频率,往往对基础的固有频率提出明确的指标要求,却未对基础的刚度提出明确要求。文中从两自由度串联弹簧质量系统固有频率的计算公式出发,推导了基础刚度与天线结构系统固有频率之间的关系式,证明了提高基础刚度比提高基础固有频率更能有效地提高天线结构系统的固有频率。文中还给出了根据天线结构自身固有频率和天线结构系统固有频率确定基础刚度指标的方法并对该方法的有效性进行了论述。

In the antenna structure system design, in order to improve the inherent frequency of the system, clear requirement for the inherent frequency of the foundation is often put forward, but not for the stiffness of the foundation. From the formula to calculate the inherent frequency of the two degree of freedom spring mass series system, the relationship between the foundation stiffness and the inherent frequency of the antenna structure system is obtained. It is proved that increasing the foundation stiffness can improve the inherent frequency of the antenna structure system more effectively than increasing the inherent frequency of the foundation. The method to determine the index of the foundation stiffness is presented according to the inherent frequency of the antenna structure itself and the antenna structure system. And the effectiveness of the method is also discussed in this paper.