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Article
Publication date: 12 January 2010

Julien Blaise, Ilian Bonev, Bruno Monsarrat, Sébastien Briot, Jason Michel Lambert and Claude Perron

The purpose of this paper is to propose two simple tools for the kinematic characterization of hexapods. The paper also aims to share the experience of converting a popular…

Abstract

Purpose

The purpose of this paper is to propose two simple tools for the kinematic characterization of hexapods. The paper also aims to share the experience of converting a popular commercial motion base (Stewart‐Gough platform, hexapod) to an industrial robot for use in heavy duty aerospace manufacturing processes.

Design/methodology/approach

The complete workspace of a hexapod is a six‐dimensional entity that is impossible to visualize. Thus, nearly all hexapod manufacturers simply state the extrema of each of the six dimensions, which is very misleading. As a compromise, a special 3D subset of the complete workspace is proposed, an approximation of which can be readily obtained using a computer‐aided design (CAD)/computer‐aided manufacturing (CAM) software suite, such as computer‐aided 3D interactive application (CATIA). While calibration techniques for serial robots are readily available, there is still no generally agreed procedure for calibrating hexapods. The paper proposes a simple calibration method that relies on the use of a laser tracker and requires no programming at all. Instead, the design parameters of the hexapod are directly and individually measured and the few computations involved are performed in a CAD/CAM software such as CATIA.

Findings

The conventional octahedral hexapod design has a very limited workspace, though free of singularities. There are important deviations between the actual and the specified kinematic model in a commercial motion base.

Practical implications

A commercial motion base can be used as a precision positioning device with its controller retrofitted with state‐of‐the‐art motion control technology with accurate workspace and geometric characteristics.

Originality/value

A novel geometric approach for obtaining meaningful measures of the workspace is proposed. A novel, systematic procedure for the calibration of a hexapod is outlined. Finally, experimental results are presented and discussed.

Details

Industrial Robot: An International Journal, vol. 37 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Content available
Book part
Publication date: 23 April 2019

Abstract

Details

European Origins of Library and Information Science
Type: Book
ISBN: 978-1-78756-718-4

Book part
Publication date: 14 November 2022

Aude Le Guennec, Clare Rose, Laetitia Barbu, Anne-Charlotte Hartmann-Bragard, Maija Nygren and Yasmin Sekhon Dhilon

As a significant part of childhood material culture, children's clothes contribute to shaping their social identity and gender, as well as to developing and supporting their…

Abstract

As a significant part of childhood material culture, children's clothes contribute to shaping their social identity and gender, as well as to developing and supporting their interactions with their environment related to their age. The focus on children's education and well-being is essential. Their voices should be emphasised in the interest of promoting an inclusive future in both research on children's material culture and in practice. However, despite the daily nature of children's interaction with clothing, their relationship with clothes is ignored and methods to support an analysis of it are lacking. An investigation of children's clothing behaviour is needed to better understand children's agency, to influence industry experts and to encourage policymakers to engage more sustainably with children's fashion. IN2FROCC (Interdisciplinary and International Network for Research on Children and Clothing) is comprised of historians, anthropologists, sociologists, ethnologists, museum curators, childhood practitioners, designers, industry representatives and children united in an investigation into children's clothes around the globe, historically and in social ecosystems. This network seeks to engage in an innovative, inclusive and organic manner with current research on children's dress codes, fashion and clothes to establish a deeper understanding of children's clothing interactions. This chapter will present the initial reflections and actions of this network, creating impactful methods for participative children's clothing culture and design.

Details

Establishing Child Centred Practice in a Changing World, Part A
Type: Book
ISBN: 978-1-80117-407-7

Keywords

Expert briefing
Publication date: 30 December 2021

This forms part of a broader reform of government and the security sector begun in recent months and accelerated by the military’s worst single loss so far in its six-year battle…

Details

DOI: 10.1108/OXAN-DB266399

ISSN: 2633-304X

Keywords

Geographic
Topical
Article
Publication date: 1 January 1947

ALFRED LOEWENBERG

The following list is a first attempt to catalogue and describe systematically the British Museum's extensive holdings of early opera librettos and related plays. The great…

Abstract

The following list is a first attempt to catalogue and describe systematically the British Museum's extensive holdings of early opera librettos and related plays. The great importance of these unpretentious booklets as supplementary and, more often than not, even primary sources for the history and bibliography of dramatic music, besides or instead of the scores, was already clearly recognized in the eighteenth century by Dr. Burney and other scholars. But it is only since 1914, the year in which O. G. T. Sonneck's Library of Congress Catalogue of opera librettos printed before 1800 appeared, that their documentary value could to any greater extent be put to general use in international musicological research. A similar bibliography of the British Museum librettos, while naturally duplicating many Washington entries, would produce a great number of additional tides, not a few of them otherwise unrecorded; it would provide the musical scholar with the key to a collection unequalled elsewhere in Europe, which owing to the peculiar nature of the material is not easily accessible by means of the General Catalogue.

Details

Journal of Documentation, vol. 2 no. 4
Type: Research Article
ISSN: 0022-0418

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