Design of a measurement system for use in static balancing a two-axis gimbaled antenna

2014 ◽  
Vol 228 (13) ◽  
pp. 2530-2541 ◽  
Author(s):  
WX Yan ◽  
ST Zhan ◽  
ZY Qian ◽  
Z Fu ◽  
YZ Zhao
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Measurement Accuracy ◽  
Key Factors ◽  
Measurement Principle ◽  
Working Principle ◽  
Control Configuration ◽  
Major Factors ◽  
Two Degree Of Freedom ◽  
Novel Design

The two-axis gimbaled antenna’s performance can be greatly improved if it is statically balanced. This paper intends to present a novel design of a measurement system for use in statically balancing a two-axis gimbaled antenna mounted on an aircraft. The details of the measurement system and its working principle are explained, including the dynamics of the two-degree-of-freedom flexure-hinge leverage and the control configuration of the measurement system. The measurement principle is proposed after the theoretical measurement uncertainties estimated and the key factors that determine the measurement accuracy are found. By controlling the uncertainty induced from the major factors, the measurement accuracy can be finally controlled. The measurement result is proved sufficiently accurate by means of High-speed centrifuge method.

Simultaneous identification of joint stiffness, kinematic and hand-eye parameters of measurement system integrated with serial robot and 3D camera

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jinlei Zhuang ◽  
Ruifeng Li ◽  
Chuqing Cao ◽  
Yunfeng Gao ◽  
Ke Wang ◽  
...  
Keyword(s):  
Measurement System ◽  
Measurement Accuracy ◽  
Joint Stiffness ◽  
Calibration Method ◽  
Identification Accuracy ◽  
Kinematic Calibration ◽  
Content Type ◽  
3D Camera ◽  
Serial Robot ◽  
Measurement Principle

Purpose This paper aims to propose a measurement principle and a calibration method of measurement system integrated with serial robot and 3D camera to identify its parameters conveniently and achieve high measurement accuracy. Design/methodology/approach A stiffness and kinematic measurement principle of the integrated system is proposed, which considers the influence of robot weight and load weight on measurement accuracy. Then an error model is derived based on the principle that the coordinate of sphere center is invariant, which can simultaneously identify the parameters of joint stiffness, kinematic and hand-eye relationship. Further, considering the errors of the parameters to be calibrated and the measurement error of 3D camera, a method to generate calibration observation data is proposed to validate both calibration accuracy and parameter identification accuracy of calibration method. Findings Comparative simulations and experiments of conventional kinematic calibration method and the stiffness and kinematic calibration method proposed in this paper are conducted. The results of the simulations show that the proposed method is more accurate, and the identified values of angle parameters in modified Denavit and Hartenberg model are closer to their real values. Compared with the conventional calibration method in experiments, the proposed method decreases the maximum and mean errors by 19.9% and 13.4%, respectively. Originality/value A new measurement principle and a novel calibration method are proposed. The proposed method can simultaneously identify joint stiffness, kinematic and hand-eye parameters and obtain not only higher measurement accuracy but also higher parameter identification accuracy, which is suitable for on-site calibration.

scholarly journals A High-Precision Method for Dynamically Measuring Train Wheel Diameter Using Three Laser Displacement Transducers

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4148 ◽  
Author(s):  
Fajia Zheng ◽  
Bin Zhang ◽  
Run Gao ◽  
Qibo Feng
Keyword(s):  
Measurement Error ◽  
Measurement System ◽  
High Speed ◽  
Measurement Accuracy ◽  
Field Experiments ◽  
Interaction Force ◽  
Simple Method ◽  
Repeatability Error ◽  
Displacement Transducers ◽  
Multi Body

Wheel diameter is a significant geometric parameter related to the safe operation of trains, and needs to be measured dynamically. To the best of the authors’ knowledge, most existing dynamic measurement methods and systems do not meet the requirement that the wheel diameter measurement error for the high-speed vehicle is less than 0.3 mm. In this paper, a simple method for dynamically and precisely measuring train wheel diameter using three one-dimensional laser displacement transducers (1D-LDTs) is proposed for the first time, and a corresponding measurement system which was developed is described. The factors that affect the measurement accuracy were analyzed. As a main factor, rail deformation caused by the wheel-rail interaction force at low (20 km/h) and high (300 km/h) speeds was determined based on the combination of multi-body dynamics and finite element methods, and the effect of rail deformation on measurement accuracy is greatly reduced by a comparative measurement. Field experiments were performed to verify the performance of the developed measurement system, and the results of the repeatability error and measurement error of the system were both less than 0.3 mm, which meets the requirement of wheel diameter measurements for high-speed vehicles.

Design of a Bioelectrical Impedance Spectrometer Based on AD5933

2012 ◽  
Vol 239-240 ◽  
pp. 392-396
Author(s):  
Ke Ning Wang ◽  
Heng Zhao ◽  
Wei Wang
Keyword(s):  
Measurement Error ◽  
Impedance Spectroscopy ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Impedance Measurement ◽  
Bioelectrical Impedance ◽  
I2c Bus ◽  
Working Principle ◽  
Machine Interface ◽  
Impedance Converter

This paper designed a bioelectrical impedance spectroscopy (BIS) measurement system based on the integrated impedance converter AD5933. The working principle of the AD5933 was briefly introduced, and a bipolar BIS measurement device was designed. The AD5933 can be controlled by MCU STC89LE516AD through an I2C bus. The software of the BIS device was written in C51 language and provides a friendly human-machine interface. Preliminary experiment showed that the impedance measurement error at different frequencies is less than 3% and found that the measurement accuracy is relatively high for larger resistor.

A Micro-Resistance Measurement Based Design Approach of Digital Micro-Ohmmeter

2011 ◽  
Vol 339 ◽  
pp. 36-42
Author(s):  
Jiang Hai Deng ◽  
Wen Jun Yan ◽  
Qiang Yang
Keyword(s):  
Measurement Accuracy ◽  
System Analysis ◽  
Current Source ◽  
Design Approach ◽  
Constant Current ◽  
Design Solution ◽  
Key Factors ◽  
Constant Current Source ◽  
The Common ◽  
Novel Design

This paper presents a novel design solution of digital micro-ohmmeter based on the micro-resistance measurements. Through the system analysis, two key factors which have impacts on the measurement accuracy are identified: constant-current source circuit and A/D converter. Therefore, we suggest a design approach to improve the common constant-current source circuit to obtain enhanced system linearity, stability, precision and robustness and use high resolution A/D converter to ensure converting accurately. The proposed design approach is assessed and demonstrates that the load disturbance can be limited to 0.05%, and the measurement precision could reach 0.2% ranging from 20mΩ to 20Ω and 1.0% below 20mΩ.

scholarly journals A New Method to Verify the Measurement Speed and Accuracy of Frequency Modulated Interferometers

2021 ◽  
Vol 11 (13) ◽  
pp. 5787
Author(s):  
Toan-Thang Vu ◽  
Thanh-Tung Vu ◽  
Van-Doanh Tran ◽  
Thanh-Dong Nguyen ◽  
Ngoc-Tam Bui
Keyword(s):  
Phase Change ◽  
High Speed ◽  
Measurement Accuracy ◽  
Slow Motion ◽  
New Method ◽  
Virtual Displacement ◽  
Electro Optic ◽  
Lock In ◽  
Speed And Accuracy ◽  
Electro Optic Modulator

The measurement speed and measurement accuracy of a displacement measuring interferometer are key parameters. To verify these parameters, a fast and high-accuracy motion is required. However, the displacement induced by a mechanical actuator generates disadvantageous features, such as slow motion, hysteresis, distortion, and vibration. This paper proposes a new method for a nonmechanical high-speed motion using an electro-optic modulator (EOM). The method is based on the principle that all displacement measuring interferometers measure the phase change to calculate the displacement. This means that the EOM can be used to accurately generate phase change rather than a mechanical actuator. The proposed method is then validated by placing the EOM into an arm of a frequency modulation interferometer. By using two lock-in amplifiers, the phase change in an EOM and, hence, the corresponding virtual displacement could be measured by the interferometer. The measurement showed that the system could achieve a displacement at 20 kHz, a speed of 6.08 mm/s, and a displacement noise level < 100 pm//√Hz above 2 kHz. The proposed virtual displacement can be applied to determine both the measurement speed and accuracy of displacement measuring interferometers, such as homodyne interferometers, heterodyne interferometers, and frequency modulated interferometers.

Development of high speed measurement system for cell-scaffold interaction

2015 ◽  
Author(s):  
Yu Hirano ◽  
Masaru Kojima ◽  
Mitsuhiro Horade ◽  
Kazuto Kamiyama ◽  
Yasushi Mae ◽  
...  
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Speed Measurement ◽  
Cell Scaffold

Synthesis of Inertially Compensated Variable-Speed Cams

2003 ◽  
Vol 125 (3) ◽  
pp. 593-601 ◽  
Author(s):  
B. Demeulenaere ◽  
J. De Schutter
Keyword(s):  
High Speed ◽  
Design Procedure ◽  
Variable Speed ◽  
Speed Variation ◽  
Design Choice ◽  
Cam Follower ◽  
Speed Fluctuation ◽  
Novel Design

Traditionally, cam-follower systems are designed by assuming a constant camshaft speed. Nevertheless, all cam-follower systems, especially high-speed systems, exhibit some camshaft speed fluctuation (despite the presence of a flywheel) which causes the follower motions to be inaccurate. This paper therefore proposes a novel design procedure that explicitly takes into account the camshaft speed variation. The design procedure assumes that (i) the cam-follower system is conservative and (ii) all forces are inertial. The design procedure is based on a single design choice, i.e., the amount of camshaft speed variation, and yields (i) cams that compensate for the inertial dynamics for any period of motion and (ii) a camshaft flywheel whose (small) inertia is independent of the period of motion. A design example shows that the cams designed in this way offer the following advantages, even for non-conservative, non-purely inertial cam-follower systems: (i) more accurate camshaft motion despite a smaller flywheel, (ii) lower motor torques, (iii) more accurate follower motions, with fewer undesired harmonics, and (iv) a camshaft motion spectrum that is easily and robustly predictable.

High speed automated pulsed I/V measurement system

1993 ◽  
Author(s):  
T. Fernandez ◽  
Y. Newport ◽  
J.M. Zamanillo ◽  
A. Mediavilla ◽  
A. Tazon
Keyword(s):  
Measurement System ◽  
High Speed

A Novel Design of the Device for Measuring Draw and Plug Forces

2012 ◽  
Vol 542-543 ◽  
pp. 1029-1032
Author(s):  
Ye Hu ◽  
Zhao Jun Yang ◽  
Ming Jun Xiang ◽  
Zi Chen Qiu ◽  
Chuan Gui Yang ◽  
...  
Keyword(s):  
Data Conversion ◽  
Memory Module ◽  
Novel Device ◽  
Working Principle ◽  
Tool Shank ◽  
Novel Design

The purpose of this paper is to present a novel device for measuring draw and plug forces, which is composed chiefly of a pull stud, a top modified tool shank, a middle modified tool shank, a down modified tool shank, and an end cover. The modified tool shank structure is proposed, and the working principle of the device for measuring draw and plug forces is demonstrated. Also, the data conversion and memory module and the circuit principle are investigated.

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