燃油管路系统振动特性有限元技术研究

航空发动机燃油管主要用于提供燃油,属于复杂3维管路系统.为了更好地分析管路系统的振动特性,以双路总管燃油管路系统为例,结合其管路繁多、连接结构多样、支撑结构特殊、管内充液等特点,系统研究了各部件的有限元模拟方法.考虑到支撑刚度对管路系统振动特性有较大影响,采用有限元静力分析对其进行了求解.结合以上不同部件的分析方法,建立起系统的振动有限元模型.对该管路系统进行模态分析,得到系统固有频率变化规律及具有分簇特点的振动模态;对系统进行共振评估,认为副燃油分管最有可能发生共振,提出了振动优化的合理建议.

Research on finite element simulation technology of fuel pipe system vibration characteristics

Aircraft engine fuel pipe is a three-dimensional pipeline system, mainly used for fuel supply. In order to analyze thevibration characteristics, taking dual fuel line system as an example, combining clustered lines, diversified connection structures, specificbracing structures and pipe with injecting liquids, the finite element simulation method has been systematically studied. Bracing stiffness ofpipeline system, which has great influence on vibration characteristics, was analyzed by the finite element static method. Combining theabove analysis methods of different components, the finite element model of vibration system was established. After modal analyzed thepipeline system, natural frequency change rule of the vibration system was obtained. The analysis results show that the mode of vibration hascluster characteristics. After the resonance evaluation of the system, vice fuel line branch was considered most possibly to resonate, andsome reasonable optimization suggestions were proposed.