液压脉动引起液压管路和壁板振动的振动响应分析

发布时间：2018-09-17 16:07

【摘要】：作为现代飞机内部机构的主要动力来源,液压系统起着重要的作用。液压管路常常由于振动而导致管路结构以及与之相连的部件发生破坏,轻者造成断裂泄漏,重者造成机毁人亡。据统计由于振动、冲击等动载荷所导致的疲劳破坏所占飞机失效形式的比例达到百分之四十以上。管道以及管道连接件等流固耦合部件等的动态失效已经成为导致飞机故障的主要原因,因此解决液压管路的振动问题是在飞机设计时的重中之重。本文运用有限元仿真软件—ANSYS/Workbench,研究了管道壁板结构的振动特性。首先,本文介绍了流固耦合理论,同时介绍了有限元仿真软件ANSYS/Workbench在模态分析和瞬态分析中的应用。其次,本文运用CATIA对管道壁板结构进行三维建模,并讲解了CATIA和ANSYS两个软件之间的模型数据传递,在ANSYS中对导入的模型进行有限元前处理。接着,运用ANSYS自带的MODAL模块对整体结构进行了模态分析,并提出了结构优化,并对改进后模型进行了有限元仿真,分析了改进措施的合理性。最后,将ANSYS自带的Transient structure模块和CFX进行连接,模拟在管道内液压正弦脉冲冲击下管道壁板结构任意一点的振动响应。
[Abstract]:As the main power source of modern aircraft internal mechanism, hydraulic system plays an important role. The hydraulic pipe is often damaged by vibration, which causes the damage of the pipe structure and the parts connected with it, the light one causes the rupture and leakage, and the heavy one causes the mechanical destruction and death. According to statistics, the proportion of fatigue failure caused by vibration and shock iso-dynamic load is more than 40%. The dynamic failure of fluid-solid coupling components such as pipelines and pipe connectors has become the main cause of aircraft failure, so it is the most important thing to solve the vibration problem of hydraulic pipes in the design of aircraft. In this paper, finite element simulation software-ANSYS / Workbench is used to study the vibration characteristics of pipe wall structure. Firstly, the fluid-solid coupling theory is introduced, and the application of finite element simulation software ANSYS/Workbench in modal analysis and transient analysis is also introduced. Secondly, this paper uses CATIA to model the pipe wall structure, and explains the model data transfer between CATIA and ANSYS, and carries on the finite element preprocessing to the imported model in ANSYS. Then, the modal analysis of the whole structure is carried out by using the MODAL module of ANSYS, and the optimization of the structure is put forward. The improved model is simulated by finite element method, and the rationality of the improvement measures is analyzed. Finally, the Transient structure module of ANSYS is connected with CFX to simulate the vibration response of pipe wall structure at any point under the impact of hydraulic sinusoidal pulse in pipeline.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V214;V245.1

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