火箭推进

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。

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.

引言
1 测试原理
2 离心轮模态分析
3 结论

图1 3D-DIC原理示意图<br/>Fig.1 Schematic diagram of 3D-DIC testing principle

图1 3D-DIC原理示意图
Fig.1 Schematic diagram of 3D-DIC testing principle

图2 基于3D-SLDV的离心轮测试现场<br/>Fig.2 Test photos of the impeller based on 3D-SLDV

图2 基于3D-SLDV的离心轮测试现场
Fig.2 Test photos of the impeller based on 3D-SLDV

图3 基于高速3D-DIC的离心轮测试现场<br/>Fig.3 Photos of impeller testing based on high-speed 3D-DIC

图3 基于高速3D-DIC的离心轮测试现场
Fig.3 Photos of impeller testing based on high-speed 3D-DIC

图4 3D-DIC计算的子集<br/>Fig.4 Subset of 3D-DIC calculations

图4 3D-DIC计算的子集
Fig.4 Subset of 3D-DIC calculations

表1 3D-SLDV和3D-DIC所得固有频率对比<br/>Tab.1 Comparison of natural frequencies obtained by 3D-SLDV and 3D-DIC

表1 3D-SLDV和3D-DIC所得固有频率对比
Tab.1 Comparison of natural frequencies obtained by 3D-SLDV and 3D-DIC

图5 3D-SLDV和3D-DIC所得全场平均位移频域结果对比<br/>Fig.5 Comparison of the frequency-domain results of the full-field average displacement obtained by 3D-SLDV and 3D-DIC

图5 3D-SLDV和3D-DIC所得全场平均位移频域结果对比
Fig.5 Comparison of the frequency-domain results of the full-field average displacement obtained by 3D-SLDV and 3D-DIC

图6 3D-SLDV和3D-DIC所得工作变形对比<br/>Fig.6 Comparison of operational deformation shapes obtained by 3D-DIC and 3D-SLDV

图6 3D-SLDV和3D-DIC所得工作变形对比
Fig.6 Comparison of operational deformation shapes obtained by 3D-DIC and 3D-SLDV

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备注

引言

1 测试原理

2 离心轮模态分析

3 结论

期刊信息