BS ISO 8625-4:2011 BSl Standards Publication Aerospace Fluid systems - Vocabulary Part 4: General terms and definitions relating to control/actuation systems bsi. ..making excellence a habit: BSISO 8625-4:2011 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0 8625-4:2011. The UK participation in its preparation was entrusted to Technical Committee ACE/69,Aerospace hydraulic systems, fluids and components. A list of organizations represented onthis committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @BSI 2011 ISBN9780580696251 ICS 01.040.49; 49.080 Compliance witha British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2011. Amendments issued sincepublication Date Text affected BS ISO 8625-4:2011 INTERNATIONAL ISO STANDARD 8625-4 First edition 2011-10-15 AerospaceFluid systems Vocabulary- Part 4: General terms and definitions relating to control/actuation systems Aeronautiqueetespace-Systemesdefluides-Vocabulaire- Partie 4:Termes et definitions generaux relatifs aux systemes de commande/d'actionnement Reference number ISO 8625-4:2011(E) @ISO 2011 BS ISO 8625-4:2011 ISO 8625-4:2011(E) COPYRIGHTPROTECTEDDOCUMENT ? ISO2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office Casepostale 56.CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2011 - All rights reserved BSISO 8625-4:2011 ISO8625-4:2011(E) Contents Page Foreword. .iv Introduction.. Scope Terms and definitions .... 4.1 Control system classification ....... 4.2 Control systemtechnology (control engineering) 4.3 Controlsystemperformance(servomechanism). @ ISO 2011 - All rights reserved ili BS ISO 8625-4:2011 ISO 8625-4:2011(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has beer InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 adopted by the technical committees are circulated to the member bodies for voting.Publication as an Attention is drawn to the possibility that some of the elements of this document may be the subject of paten rights. IsO shall not be held responsible for identifying any or all such patent rights. IsO 8625-4 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10,Aerospacefluidsystems and components. —Part1:Generaltermsanddefinitionsrelatingtopressure —Part2:Generaltermsanddefinitionsrelatingtoflow Part3:Generalterms anddefinitions relatingtotemperature Part4:Generaltermsanddefinitions relatingtocontrol/actuationsystems iv ISO 2011 All rights reserved BS ISO 8625-4:2011 ISO 8625-4:2011(E) Introduction are only used for specific applications and specific components are to be incorporated into the relevant product specifications and product standards. Terms and definitions for components and systems which are associated with other systems (such as electromechanical actuation systems or electronic control units) are incorporated only on a very general basis, provided they have direct interfaces with fluid systems. @ ISO 2011 - All rights reserved V