飞机燃油管道随机振动分析与设计优化

Random Vibration Analysis and Design Optimization of Aircraft Fuel Pipeline

为了降低管道结构振动,提高其疲劳寿命,针对某型飞机某段故障燃油管路,建立了基础激励下的燃油管道的管道-卡箍有限元动力学模型,利用Newmark-β法直接在时域进行了管道系统振动仿真,提出了3种卡箍优化方案,并用仿真分析的方法验证了其对于降低管道结构振动的有效性。最后进行了优化方案的试验验证,试验和仿真结果在3种优化方法的评价方面取得了很好的一致性,均表明了优化后的管道振动明显降低,疲劳寿命显著提高。

In order to reduce the vibration of pipeline structure and improve its fatigue life,aiming at a certain type of aircraft failure fuel pipeline of a section,the pipeline-clamp finite element dynamic model of the fuel pipeline under basic excitation was established.The Newmark-βmethod was used to simulate the vibration of pipeline system directly in time domain,three optimization schemes of clamp were put forward.The effectiveness of the method to reduce the vibration of pipeline structure was verified by simulation analysis.Finally,the optimization scheme was tested and verified.The results of the test and simulation are in good agreement with the evaluation of the three optimization methods,all of which show that the vibration of the optimized pipeline is significantly reduced and the fatigue life is significantly increased.