基于3D-SLDV和高速3D-DIC的离心轮模态分析
Modal analysis of the impeller based on 3D-SLDV and high speed 3D-DIC technology
闫松 1张志伟1
作者信息
- 1. 航天液体动力全国重点实验室,陕西 西安 710100;西安航天动力研究所,陕西 西安 710100
- 折叠
摘要
全场振型对于研究发动机结构动特性至关重要,介绍了基于3D-SLDV和高速3D-DIC两种全场振动测试方法的测试原理.以液体火箭发动机离心轮为例,分别采用两种技术获得了 5 kHz内离心轮的固有频率和振型,对比分析了两种测试方法的优缺点,结果表明:3D-SLDV 技术比3D-DIC技术具有更低的位移本底噪声,对高频振型辨识更有利,但该方法属于逐点扫描测试,测试时间长;3D-DIC技术全场数据同时采集,采集时间短,具有更精细的振型,但图像的数据量大,数据传输和分析时间长,同时这种基于位移的测试方法存在本底噪声限制.
Abstract
The full-field mode shape is important for studying the structural dynamic characteristics of the engine structure.The test principles of two full-field vibration test methods based on 3D-SLDV and high-speed 3D-DIC are introduced.Taking the impeller of liquid rocket engines as an example,the natural frequency and mode shape of the impeller within 5 kHz are obtained by using two technologies respectively,and the advantages and disadvantages of the two test methods are compared and analyzed.Compared with 3D-DIC,the displacement noise floor of 3D-SLDV technology is lower,which is more beneficial to the identification of high-frequency mode shapes,but this method belongs to the point-by-point scanning test,and the test time is long.3D-DIC technology collects the full-field data simultaneously,its acquisition time is short,and it has a more refined mode shape.However,the amount of image data is large,and it takes a long time to download and analyze the data.At the same time,this displacement-based measurement method cannot identify the displacement below the noise floor.
关键词
液体火箭发动机/3D-SLDV/高速3D-DIC/离心轮/工作变形Key words
liquid rocket engines/3D-SLDV/high-speed 3D-DIC/impeller/operational deflection shape引用本文复制引用
基金项目
国家重点实验室项目(HTKJ2021KL011004)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据