摘要
将国产大飞机C919的一段多弯曲液压管路,按弯曲结构分为多个分段,基于目前公认的液压管路流固耦合14-方程分析了各段之间的关系,采用传递矩阵法创建了该段管路的完整传递矩阵动力学模型。进一步,基于Matlab软件编程求解该动力学模型的偏微分方程组,分析该管路在正常飞行振动载荷及功能冲击载荷作用下的流固耦合振动,得到其在3个方向激励下的轴向速度频域响应,并通过实验验证了该数学模型的分析结果。研究结果表明:3个方向激励下的响应频率相同,仅响应幅值会有所不同;管路在低频处的振动幅值较大,说明低频振动更为剧烈,更易引发谐振失效,在管路设计时要予以重视;所建立的传递矩阵动力学模型及其求解算法准确度均较高,误差最大仅为4.5%。
A section of multi-bending hydraulic pipeline of the domestic large aircraft C919 is divided into multiple subsections according to the curved structure,the relationship between the subsections is analyzed based on the currently shared fluidsolid coupling equation-14 for hydraulic pipelines,and a complete dynamical model for transfer matrixes for the section of the pipeline is established by using the transfer matrix method. Then,the system of partial differential equation of the model is solved based on Matlab programming,and the pipeline＇s fluidsolid coupling vibration under normal flight vibration load and functional impact load is analyzed,thus the frequency domain response in the axial velocity under three-direction excitation is obtained. The results of the model analysis are verified by experiment. The experiment shows that the respective response frequencies under three directions of excitation are the same,only the amplitudes of the response are different. Furthermore,the vibration amplitude of the pipeline at low-frequency is larger,which indicates that the low frequency vibration is more intense,and which is more likely to trigger resonant failure. The proposed transfer matrix dynamic model and its solution algorithm have high accuracy,and the maximum error is only 4. 5%.
出处
《高技术通讯》
北大核心
2017年第11期966-974,共9页
Chinese High Technology Letters
基金
973计划(2014CB046400)
国家自然科学基金(51375423
51505410)资助项目
关键词
航空液压管路
流固耦合
动力学方程
传递矩阵法
频域响应
aviation hydraulic pipeline, fluid-solid coupling, kinetic equation, transfer matrix method, frequency domain response
