航天推进技术研究院主办
[1]高轩,陈洪恩,王猛,等.基于有限测点的复杂管路全局振动预示方法[J].火箭推进,2022,48(02):45-55.
GAO Xuan,CHEN Hongen,WANG Meng,et al.A global vibration evaluation method based on information of limited measuring points for a complex pipeline[J].Journal of Rocket Propulsion,2022,48(02):45-55.
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GAO Xuan,CHEN Hongen,WANG Meng,et al.A global vibration evaluation method based on information of limited measuring points for a complex pipeline[J].Journal of Rocket Propulsion,2022,48(02):45-55.
基于有限测点的复杂管路全局振动预示方法
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
48
期数:
2022年02期
页码:
45-55
栏目:
目次
出版日期:
2022-04-30
- Title:
- A global vibration evaluation method based on information of limited measuring points for a complex pipeline
- 文章编号:
- 1672-9374(2022)02-0045-11
- 分类号:
- V434
- 文献标志码:
- A
- 摘要:
- 基于数值模拟和实验提出和验证了一种利用有限测点振动信息进行典型管路系统约束状态及载荷参数重构识别,进而通过精细有限元建模实现管路系统动态响应评估的管路全局振动检测预示方法。主要研究内容包括:首先,建立了典型发动机管路结构随机振动响应分析正问题有限元模型,提出了针对管路振动全面预示的测点设置策略 其次,发展了激励和约束参数分别重构的振动系统参数识别方法,基于共轭梯度法建立了载荷、约束确定论反演算法,确立了基于管路系统实际结构和载荷、约束参数重构结果的高精度振动建模方法 最后,搭建了管路系统的简谐/随机振动实验系统,基于位移和应变振动测量信号进行了约束刚度和载荷的重构,建立了发动机典型管路的精细有限元模型,实现了管路结构振动位移和应力的全面检测预示,验证了所提方法的有效性。结果发现,针对仿真和实测振动信号均可实现对管路振动的有效检测预示,能够确定管路薄弱位置和最大应力状态,可为重型等新型发动机管路结构设计和完整性评价提供有效支撑。
- Abstract:
- In this paper, a method was proposed and validated through numerical analysis and experiments to evaluate the global vibration state of a pipeline by establishing fine finite element model of the pipeline structure with practical excitation loads and constraint conditions. The major contents of this paper include three parts.Firstly, a finite element model for efficient forward analysis of the random vibration of typical engine pipeline system was developed, and a rule to select the number and the position of the vibration measuring points was proposed. Secondly, a multistep strategy was proposed to reconstruct the load and constraint parameters, respectively. And an inversion scheme and corresponding numerical code were developed based on the conjugate gradient optimization method. Furthermore, a reliable finite element model was established based on the designed geometry of the pipeline and the reconstructed load and constraint parameters to give proper prediction of vibration at any point of the pipeline. Thirdly, an experimental system was established with a cantilever straight pipe and a typical pipe structure of a real engine, to measure the vibration and dynamic strain signals under excitation of sinusoidal and random load. Based on the measured information, the load and constraint conditions were reconstructed and the fine finite element model using reconstructed information was established, which was proved capable to evaluate the global vibration state of the whole pipe structure. As conclusion, the method of this paper can give good prediction of the vibration state at any position of pipeline from both the simulated and measured vibration signals at limited measuring points, and predict the location and value of the maximum stress point for the structural integrity evaluation of the pipeline from the heavy rocket engines.
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备注/Memo
收稿日期:2022-02-04 修回日期:2022-03-07
基金项目:国家自然科学基金(11927801)
作者简介:高轩(1994—),男,博士生,研究领域为管路结构振动检测预示。
通信作者:陈振茂(1964—),男,博士,教授,研究领域为无损检测及结构完整性理论与应用。
更新日期/Last Update:
1900-01-01