Flexible center of gravity measurement method and uncertainty evaluation

Mei-bao WANG; Xiao-lin ZHANG; Wen-yan TANG; Jun WANG

doi:10.3788/OPE.20192707.1500

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Flexible center of gravity measurement method and uncertainty evaluation

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Flexible center of gravity measurement method and uncertainty evaluation
- Optics and Precision Engineering Vol. 27, Issue 7, Pages: 1500-1507(2019)
- 作者机构：
  
  哈尔滨工业大学仪器科学与工程学院，黑龙江哈尔滨 150001
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192707.1500
  CLC： TH89
- Received：09 January 2019，
  
  Accepted：20 February 2019，
  
  Published：15 July 2019
- 稿件说明：
移动端阅览
Mei-bao WANG, Xiao-lin ZHANG, Wen-yan TANG, et al. Flexible center of gravity measurement method and uncertainty evaluation[J]. Optics and precision engineering, 2019, 27(7): 1500-1507.
DOI：

Mei-bao WANG, Xiao-lin ZHANG, Wen-yan TANG, et al. Flexible center of gravity measurement method and uncertainty evaluation[J]. Optics and precision engineering, 2019, 27(7): 1500-1507. DOI： 10.3788/OPE.20192707.1500.

摘要

为了实现大尺寸飞行器质心的测量，提出了一种柔性质心测量方法。对该方法的重力作用线测量、坐标转换、质心合成等问题进行了研究并进行了不确定度分析。首先，测量被测件在任意一个状态下质心在测量设备中的投影，建立通过该投影的重力作用线并通过坐标转换将重力作用线转换到被测件坐标系下。然后，将被测件旋转或倾斜任意一个角度，测量该状态下重力作用线并转换到被测件坐标系中，通过求得两条重力作用线的交点获得质心。最后，采用蒙特卡洛仿真分析法对该测量方法进行了不确定度评定。仿真分析表明，该方法的测量误差≤0.3 mm，实验结果表明，质心测量误差≤0.3 mm，可以在被测件与测量设备相对位置关系未知的情况下实现质心的高精度测量。

Abstract

To measure the center of gravity of a large-sized aircraft

a flexible center of gravity measurement method is proposed. A method to obtain the line that passes through the center of gravity

the coordinate transformation

and the means to obtain the center of gravity itself are also proposed. First

the projection of the line that passes through the center of gravity is measured

and a line that passes through this projection point is established and converted into a coordinate system of the body under test. Second

by means of rotating or tilting the body at any angle

the second line using the same method is measured and converted into the coordinate system of the body. The center of gravity is obtained by finding the intersection of the two lines. Finally

a Monte Carlo simulation analysis method is used to determine the method's uncertainty. Both the simulation analysis and experimental results showed that the center of gravity measurement error is within 0.3 mm. Thus

the proposed method can achieve high-precision detection of the center of gravity even when the position between the device under test and the measuring device is unknown.

关键词

Keywords

references

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