scholarly journals A Development of a High Resolution Measuring System of Movement in Six-Degree-of-Freedom.

1999 ◽  
Vol 43 (1) ◽  
pp. 149-159 ◽  
Author(s):  
Eiichi Bando ◽  
Toyoko Satsuma ◽  
Shuji Shigemoto
Keyword(s):  
High Resolution ◽  
Degree Of Freedom ◽  
Measuring System ◽  
Six Degree Of Freedom

Development of a Measuring System for the Measurement of Motions Errors of a Linear Stage

2004 ◽  
Author(s):  
Wen-Yuh Jywe ◽  
Chien-Hung Liu ◽  
Sheng-Chung Tzeng ◽  
Po Chou ◽  
Chu-Wei Lin
Keyword(s):  
Measuring Method ◽  
Degree Of Freedom ◽  
Angular Error ◽  
Measuring System ◽  
Linear Stage ◽  
Process Verification ◽  
Error Components ◽  
Dual Beam ◽  
Six Degree Of Freedom ◽  
Straightness Error

A high precision six-degree-of-freedom measuring system is developed in this paper for the motion measurement of a linear stage. It integrates a miniature dual-beam fiber coupled laser interferometer with the multiple optical paths and quadrant detectors to be capable of measuring six-degree-of-freedom motion errors. The proposed measuring method provides rapid performance, simplicity of setup, and pre-process verification of a linear positioning stage. The experimental setup and algorithm for the error verification are presented in the paper. The measuring range of the proposed measuring system is ±40μm for straightness and 40 arc sec for pitch, roll and yaw. Within the range of ±40μm and 40 arc sec, it has been found that the system’s resolution and accuracy of measuring straightness error components are about 0.04 μm and ±0.06 μm, respectively. The resolution and accuracy of measuring pitch and yaw angular error components are about 0.06 arc sec and ±0.8 arc sec, respectively. The resolution and accuracy of measuring roll angular error are about 0.05 arc sec and ±0.07 arc sec, respectively.

A Gravity-Powered Mechanism for Extending the Workspace of a Cable-Driven Parallel Mechanism: Application to the Appearance Modelling of Objects

2010 ◽  
Vol 4 (4) ◽  
pp. 372-379 ◽  
Author(s):  
Clément Gosselin ◽  
◽  
Samuel Bouchard
Keyword(s):  
High Resolution ◽  
Parallel Mechanism ◽  
Light Field ◽  
Degree Of Freedom ◽  
Passive Mechanism ◽  
Six Degree Of Freedom

This paper presents a gravity-powered passive onedof mechanism used to extend the workspace of a six-degree-of-freedom cable-driven parallel mechanism. The passive mechanism is mounted on the platform of the cable-driven mechanism in order to increase the useful workspace of the system. The application that stimulated the development of the mechanism is a system for capturing the light field of an object to reproduce the appearance of artefacts. The concept is based on a six-degree-of-freedom (6-dof) cable-driven parallel mechanism that is used to move a high resolution camera around the object. The geometry of the mechanism is optimized in order to cover a workspace defined as a hemisphere centred on the object.

Iterative feedback control based on frequency response model for a six-degree-of-freedom micro-vibration platform

2021 ◽  
pp. 107754632199731
Author(s):  
He Zhu ◽  
Shuai He ◽  
Zhenbang Xu ◽  
XiaoMing Wang ◽  
Chao Qin ◽  
...  
Keyword(s):  
Feedback Control ◽  
Frequency Response ◽  
Control Strategy ◽  
Degree Of Freedom ◽  
Small Displacement ◽  
Response Model ◽  
Parameter Uncertainties ◽  
Micro Vibration ◽  
Six Degree Of Freedom ◽  
Iterative Feedback

In this article, a six-degree-of-freedom (6-DOF) micro-vibration platform (6-MVP) based on the Gough–Stewart configuration is designed to reproduce the 6-DOF micro-vibration that occurs at the installation surfaces of sensitive space-based instruments such as large space optical loads and laser communications equipment. The platform’s dynamic model is simplified because of the small displacement characteristics of micro-vibrations. By considering the multifrequency line spectrum characteristics of micro-vibrations and the parameter uncertainties, an iterative feedback control strategy based on a frequency response model is designed, and the effectiveness of the proposed control strategy is verified by performing integrated simulations. Finally, micro-vibration experiments are performed with a 10 kg load on the platform. The results of these micro-vibration experiments show that after several iterations, the amplitude control errors are less than 3% and the phase control errors are less than 1°. The control strategy presented in this article offers the advantages of a simple algorithm and high precision and it can also be used to control other similar micro-vibration platforms.

scholarly journals Design and Calibration of a Hall Effect System for Measurement of Six-Degree-of-Freedom Motion within a Stacked Column

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3740
Author(s):  
Olafur Oddbjornsson ◽  
Panos Kloukinas ◽  
Tansu Gokce ◽  
Kate Bourne ◽  
Tony Horseman ◽  
...  
Keyword(s):  
Hall Effect ◽  
Degrees Of Freedom ◽  
Reactor Core ◽  
Degree Of Freedom ◽  
Life Extension ◽  
Scale Model ◽  
Design Development ◽  
Seismic Safety ◽  
Six Degrees Of Freedom ◽  
Six Degree Of Freedom

This paper presents the design, development and evaluation of a unique non-contact instrumentation system that can accurately measure the interface displacement between two rigid components in six degrees of freedom. The system was developed to allow measurement of the relative displacements between interfaces within a stacked column of brick-like components, with an accuracy of 0.05 mm and 0.1 degrees. The columns comprised up to 14 components, with each component being a scale model of a graphite brick within an Advanced Gas-cooled Reactor core. A set of 585 of these columns makes up the Multi Layer Array, which was designed to investigate the response of the reactor core to seismic inputs, with excitation levels up to 1 g from 0 to 100 Hz. The nature of the application required a compact and robust design capable of accurately recording fully coupled motion in all six degrees of freedom during dynamic testing. The novel design implemented 12 Hall effect sensors with a calibration procedure based on system identification techniques. The measurement uncertainty was ±0.050 mm for displacement and ±0.052 degrees for rotation, and the system can tolerate loss of data from two sensors with the uncertainly increasing to only 0.061 mm in translation and 0.088 degrees in rotation. The system has been deployed in a research programme that has enabled EDF to present seismic safety cases to the Office for Nuclear Regulation, resulting in life extension approvals for several reactors. The measurement system developed could be readily applied to other situations where the imposed level of stress at the interface causes negligible material strain, and accurate non-contact six-degree-of-freedom interface measurement is required.

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