基于测点优化和加速度计的叶轮模态测试

刘景云; 孙 涛; 彭 博; 伊 寅; 严 海; 高慧中

doi:10.11993/j.issn.1673-1948.2016.05.008

基于测点优化和加速度计的叶轮模态测试

doi: 10.11993/j.issn.1673-1948.2016.05.008

刘景云^1,2,
孙涛¹,
彭博¹,
伊寅¹,
严海¹,
高慧中¹

1.
中国船舶重工集团公司第705研究所, 陕西西安, 710077
2.
水下信息与控制重点实验室, 陕西西安, 710077

基金项目: 船舶工业国防科技预研基金项目(14J4.4.1)

详细信息

作者简介:
刘景云(1991-), 男, 在读硕士, 主要研究方向为测试测量技术.

中图分类号: TJ630.32; TP35
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出版历程
- 收稿日期: 2016-06-12
- 修回日期: 2016-07-07
- 刊出日期: 2016-10-20

Impeller Modal Testing Based on Measuring Points Optimization and Acceleration Sensors

1.
The 705 Research Institute, China Shipbuilding Industry Corporation, Xi′an 710077, China
2.
Science and Technology on Underwater Information and Control Laboratory, Xi′an 710077, China

摘要

摘要: 鱼雷涡轮机叶轮体积小、质量轻, 加速度传感器的数量对叶轮模态的测试精度和可测阶数有直接影响。为了尽可能减少测点数目以降低附加质量对叶轮固有频率的影响, 将叶轮有限元网格模型及模态计算结果导入LMS Virtual.lab中进行模态置信度分析, 优化出叶轮模态试验的响应测点数量和位置, 以及激励点的位置和方向。以预试验分析结果为指导, 采用加速度传感器测量出叶轮前3阶固有频率和振型。试验模态和计算模态的振型基本一致, 固有频率最大相对误差为3.3%。研究表明, 对传感器的位置和数量进行优化后可提高涡轮机叶轮模态测试效果, 但无法完全消除附加质量对叶轮固有频率的影响, 建议采用非接触激光测振技术来获取精确详细的叶轮模态参数。
- 鱼雷涡轮机 /
- 叶轮 /
- 有限元 /
- 预试验 /
- 模态测试
Abstract: Since torpedo turbine impeller is small and light, the number of acceleration sensors has a direct effect on testing precision and measured order of impeller modal. In order to reduce the number of testing points for the purpose of decreasing the effect of additional mass on the natural frequency of the impeller, modal confidence analysis is carried out by introducing the finite element grid model and the modal calculation result of the impeller into the software LMS Virtual.lab. The response number and positions of the measuring points, as well as the position and direction of the excitation point, in impeller modal testing are optimized. The first 3 orders of natural frequency and vibration modes of the impeller are identified with acceleration sensors on the basis of pre-test. The vibration modes of the modals from testing coincide with that from calculation, and the maximum error of natural frequency is 3.3%. This research indicates that the optimized position and number of sensors can improve modal testing effect, but cannot eliminate the influence of additional mass on the natural frequency of the impeller completely. It is suggested that the non-contact laser vibrameter technology be employed to obtain more accurate impeller modal parameters.
- torpedo turbine /
- impeller /
- finite element /
- pre-test /
- modal testing

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参考文献(7)

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