ISO INTERNATIONAL STANDARD 22423 First edition 2019-01 Foil bearings - Performance testing of foil thrust bearings Testing of static load capacity, bearing torque, friction coefficient and lifetime Reference number IS0 22423:2019(E) ISO @ IS0 2019 IS0 22423:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 22423:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions ..1 4 Symbols. .2 4.1 Basic characters - Roman alphabet .2 4.2 Basic characters — Greek alphabet .3 4.3 Additional signs Subscripts. .3 5 Purpose of test .3 6 Test conditions .3 6.1 General. .3 6.2 Design of test apparatus 4 6.3 Installation of sensors .4 6.4 Test specimens 4 Test methods. .5 7.1 Principle. .5 7.2 Start-stop test cycle and evaluation of the take-off speed 5 7.3 Calculation of bearing torque and load. .7 7.4 Determination of static load capacity .7 7.5 Evaluation of static load capacity per unit area. ..8 8 Friction coefficient ..8 9 Durability test and lifetime ..8 9.1 Test procedure. ..8 9.2 Determination of lifetime ..9 10 Test report .9 Annex A (informative) Configuration of a typical foil thrust bearing .10 Annex B (informative) Test report ..12 Bibliography ..13 @ IS0 2019 - All rights reserved iii