直管和弯管比较下的疲劳试验台稳定性的研究

为研究某型航空发动机叶片定寿试验台的压力和加载力的稳定性，通过仿真的方式对其进行了系统研究。首先，用MATLAB/SimHydraulics软件建立了液压试验台模型；其次，在系统模型的基础上，分析研究了当前端管路分别为直管和弯管时对系统压力脉动和载荷稳定性不同的影响；最后，改变弯管的弯曲度逐步进行仿真。通过研究发现，弯管环境下的高低周复合疲劳试验台能更好的降低压力脉动，提高载荷稳定性。大弯曲度的弯管可以有效提高试验台载荷稳定性，并在一定程度上稳定系统压力。此研究为试验台液压系统的设计与生产提供提供了必要的指导，可以确定更加准确的叶片寿命。

Research for the Stability of Fatigue Test Bench Based on A Straight Pipe and A Bend Pipe

In order to study the pressure of a lifetime-determination experiment bench of a certain type of aircraft engine fan blade and reach the purpose of improving the stability of the test loading force, the method of simulation has been used. First, we established the experiment bench model based on MATLAB/SimHydraulics. Then, on the basis of the system model, we completed the research of the front line of the accumulator: study the different influences of the system pressure pulsation and load stability when the front line are straight tube and bending tube respectively. Last, simulated step by step by changing the curvature of the bend pipe. From the study we found that the simulation of high low cycle fatigue test rig has reached the expected purpose based on bend pipe. The bend pipe with large curvature radius can increase the stability of the loading effectively under the experiment bench and steady the pressure of the system. In conclusion, this study provided necessary guidance to the design and production of experiment bench, so that we can get better lifetime determination results.