回转件弯扭测量系统及其不确定度分析

李志凤; 赵登峰; 马国鹭; 曾国英; 卢展

doi:doi:10.5768/jao201536.0503003

应用光学, 2015, 36 (5): 778, 网络出版: 2015-12-18

回转件弯扭测量系统及其不确定度分析

Bending and torsion measuring system of rotary parts and it’s uncertainty analysis

论文大纲

李志凤 ^*赵登峰马国鹭曾国英卢展

作者单位

西南科技大学制造科学与工程学院, 四川绵阳 621010

激光多普勒扭转振动弯曲振动测量不确定度 laser Doppler torsional vibration flexural vibration measurement uncertainty

摘要

为了准确诊测轴系振动特性, 基于激光多普勒的频移原理, 提出一种能同时测量旋转轴系弯曲振动、扭转振动和轴系旋转速度的方法。设计了能分离弯扭振动的多普勒外差干涉光路, 结合光学差拍及参考光技术, 构建了测量系统数学模型。对影响激光多普勒弯扭振动测量的主要因素进行了分析, 讨论了各参量对测量结果的影响, 并给出了相应的测量不确定度。在置信水平为95%时, 瞬时转速的不确定为0.079 r/min,弯曲振动速度分量的不确定为0.001 4 mm/s, 其精度能满足旋转状态下轴系振动的综合测量要求。

Abstract

In order to accurately diagnose the shafting vibration characteristics,a method based on the principle of laser Doppler frequency shift was proposed to measure the rotation shaft bending vibration,torsional vibration and shaft rotation speed at the same time. Combining with the optical heterodyne technique and the reference light technology, the Doppler heterodyne interference light path was designed for separating the twist vibration,and the mathematical model of the measurement system was constructed.Moreover, the main factors were analyzed for affecting the laser Doppler bending torsional vibration measurement, the influence of various parameters on the measuring results were discussed and the corresponding measurement uncertainty was presented . In the confidence level of 95%, the uncertainty of the instantaneous speed is 0.079 r/min,and that of the bending vibration velocity component is 0.001 4 mm/s, which can meet the requirement of the rotating shaft vibration comprehensive measurement.

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李志凤, 赵登峰, 马国鹭, 曾国英, 卢展. 回转件弯扭测量系统及其不确定度分析[J]. 应用光学, 2015, 36(5): 778. Li Zhifeng, Zhao Dengfeng, Ma Guolu, Zeng Guoying, Lu Zhan. Bending and torsion measuring system of rotary parts and it’s uncertainty analysis[J]. Journal of Applied Optics, 2015, 36(5): 778.

回转件弯扭测量系统及其不确定度分析

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