| Antenna seat is installed on the head of plane. The radar is installed above it. It is used to adjust the radar for different angles and positions. The antenna seat is driven by shaft and gear. According to the survey of America institution, aircraft faults, in 50 percent, is caused by vibration and shock. Vibration causes dynamic stress and fatigue and noise. These will seriously affect the reliability of radar,reduce the life of the radar and damage electronic components and electrical module. Therefore, the design of the antenna seat considers not only the reliable and integrated functions, as well as the structural strength and stiffness requirements, but also the dynamic performance which is needed to all working conditions requirements. In this paper, a finite element analysis of the strength and stiffness for the antenna seat structure has been done. Improvement methods of structural dynamic performance have been developed. Mainly, the following several aspects of the research work have been done in this paper.â‘ The 3-D finite element model of the major components of the antenna seat has been established. The structural static finite element analysis has been done based on these models. By analysis results, the stress and displacement field of the main components have been showed directly. Structural strength and stiffness of main components satisfy all of the conditions of static requirements.â‘¡The 3-D finite element model of antenna seat has been established. The modal analysis of two typical locations has been performed. By the analysis, the various modal parameters (natural frequencies and mode shapes) are obtained. By analyzed modal parameters to determine the dynamic performance of the antenna seat can not satisfy the dynamic performance of practice requirements. So, the next study goal is that structure improvement must be brought forward to change dynamic performance of the antenna seat to satisfy the dynamic performance of practice requirements.â‘¢It has fulfilled the thinking that the dynamic performance of the whole assembly structure based on the dynamic performance improvement of the main components. Firstly, the sensitivity analysis of the influence of the part parameters amendment to dynamic characteristics is used. By changing the parameters of the structure of the various components, it has obtained key rule that it describes the change of structural parameters of the components which impact the dynamic performance of the various components. â‘£The key rule, describes the change of structural parameters of the components which impact the dynamic performance of the various components, has been used in next step of study. The realization of structure improvement of main components of antenna seat has been obtained. So, the structure improvement of antenna seat has been obtained. The improved structure has greatly enhanced the dynamic performance of antenna seat.The paper aims at increasing the reliability of structural design. By study, one design ideas of structure improvement to enhance reliability of the design has been obtained. The research results provide a good reference of the study to raise the reliability of structural design. |
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