作者：周东, 李广武

作者单位：航天科技集团四院四零一所, 陕西西安 710025

关键词：波纹管; 振动; 频谱分析; 有限元; 供气系统

摘要：

针对冲压发动机地面直连式试验推力测量数据振动现象,利用LabWindows/CVI编程对实际推力测量试验数据进行了频谱分析;探讨了进气管路失稳条件,给出了横向振动固有频率,采用有限元方法对波纹管进行了模态计算。分析表明所述振动问题主要诱因为垂向波纹管的横向振动与轴向波纹管轴向振动,提出了改进方案,多次发动机热试验验证了分析结果的正确性。

Research on vibration features of gas-feeding pipes in thrust measurement system for ramjet motor connected ground testing

ZHOU Dong, LI Guang-wu

The 401 Institute of the Fourth Academy of CASA, Xi'an 710025, China

Abstract: Aiming at the vibration problem of thrust measurement data in ramjet-motor ground testing, spectrum analysis of practical data with Windows/CVI program was conducted. The instability condition of pipes was discussed and the intrinsic frequency of transverse direction in pipes was deduced. The modal of bellow was studied under different conditions with FEM,and the results show that the key reasons of the described problem is due to cross-oscillation of the vertical-bellows and axial vibration of the axial bellows. Some suggestions were also proposed. Test results are in excellent agreement with those of the available analytical solution.

Keywords: bellows; vibration; spectrum analysis; finite element method; gas feeding pipe

2011, 37(2): 5-8,57  收稿日期: 2010-8-10;收到修改稿日期: 2010-10-20

基金项目: 

作者简介: 周东(1963-),男,高级工程师,硕士,主要从事冲压发动机地面试验测量控制方向的研究。

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