第
32
卷第
4
期
2008
年
8
月
南京理工大学学报(自然科学版)
Journal
of
Nanjing
University
of
Science
and
Technology
(Natural Science)
Vo
l.
32
No.4
主监
J
些主
基于阻尼比实时算法的转动惯量测量研究
李慧鹏,唐文彦,张春富,王
军
(哈尔滨工业大学电气工程学院,黑龙江哈尔滨
15
∞
01)
摘
要:为了提高扭摆动法转动惯量测量精度和测量稳定性,从理论上证明了采用光电计时法
测量扭摆动周期时,测量位直偏差会引起周期测量误差,而利用多次周期平均的计算方法不会
减小测量误差
O
提出了一种利用相邻扭摆周期面积比实时计算阻尼比的方法,并证明了该方法
的可行性。实验结果表明:利用该文提出的方法测得转动惯量的标准差比光电计时法减小一个
数量级。
关键词:转动惯量;阻尼比;光电计时法;扭摆
中图分类号
:TJ
760.6
文章编号:
1005 -
9830
(2008)
04
-
0472
-
04
Measurement of Moment of Inertia
ßased
on Real-time
Computing Damping Ratio
LI
Hui-peng ,
TANG
Wen-yan ,
ZHANG
Chun-
旬,
WANG
Jun
(School of Electrical Engineering and Automation , Harbin Institute of Technology , Harbin 150001 ,
China)
Abstract:
In order to enhance the accuracy and the stability for measuring moment of inertia through
the torsion pendulum method
, it is demonstrated in principle the measuring position error can cause
the period measurement error in the measurement of the period of torsion pendulum using the photoe-
lectricity timing method
, but the measurement error can not be reduced by multi-average. A method
of real-time computing damping ratio using the ratio of adjacent area of period is presented
, and the
feasibility of this method is demonstrated by theoretical analysis. The experimental results show that
the standard deviation of moment of inertia with the method introduced here decreases an order of
magnitude than that with photoelectricity timing method.
Key
words:
moment of inertia; damping ratio; photoelectricity timing method; torsion pendulum
转动惯量是各类飞行器物理参数中重要的参
数之一,比较常用的转动惯量测量方法有扭摆法、
收稿日期
:2
∞
6
-05
一
22
修回日期
:2008
-05
-08
三线摆法、落体法等
[1
,
2]
。除扭摆法外,其它的测
量方法承重和测量精度相对较低。对于质量和外
基金项目:哈尔滨工业大学优秀青年教师培养计划资助项目
(HITQNJS.2
∞
7.022)
作者简介:李慧鹏(1
975
-
),男,讲师,主要研究方向:传感技术、光电测控、空间大尺寸测量技术,
E-mail:
li-
huipeng@
hi
t.
edu.
cn
o