ISO/TS 31657-1:2020
(Main)Plain bearings — Hydrodynamic plain journal bearings under steady-state conditions — Part 1: Calculation of multi-lobed and tilting pad journal bearings
Plain bearings — Hydrodynamic plain journal bearings under steady-state conditions — Part 1: Calculation of multi-lobed and tilting pad journal bearings
This document specifies the general principles, assumptions and preconditions for the calculation of multi-lobed and tilting-pad journal bearings by means of an easy-to-use calculation procedure based on numerous simplifying assumptions. For a reliable evaluation of the results of this calculation method, it is indispensable to consider the physical implications of these assumptions as well as practical experiences for instance from temperature measurements carried out on real machinery under typical operating conditions. Applied in this sense, this document presents a simple way to predict the approximate performance of plain journal bearings for those unable to access more complex and accurate calculation techniques. The calculation method serves for the design and optimisation of plain bearings, for example in turbines, compressors, generators, electric motors, gears and pumps. It is restricted to steady-state operation, i.e. in continuous operating states the load according to size and direction and the angular velocity of the rotor are constant. Unsteady operating states are not recorded. The stiffness and damping coefficients of the plain journal bearings required for the linear vibration and stability investigations are indicated in ISO/TS 31657-2 and ISO/TS 31657-3.
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TECHNICAL ISO/TS
SPECIFICATION 31657-1
First edition
Plain bearings — Hydrodynamic plain
journal bearings under steady-state
conditions —
Part 1:
Calculation of multi-lobed and tilting
pad journal bearings
PROOF/ÉPREUVE
Reference number
ISO/TS 31657-1:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO/TS 31657-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/TS 31657-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 1
5 General principles, assumptions and preconditions . 7
6 Calculation method . 9
6.1 General . 9
6.2 Load carrying capacity .11
6.3 Frictional power.11
6.4 Lubricant flow rate .12
6.5 Heat balance .13
6.6 Maximum lubricant film temperature .14
6.7 Maximum lubricant film pressure .15
6.8 Operating states .15
6.9 Further influencing parameters .15
6.10 Stiffness and damping coefficients .16
7 Figures .
...
TECHNICAL ISO/TS
SPECIFICATION 31657-1
First edition
2020-06
Plain bearings — Hydrodynamic plain
journal bearings under steady-state
conditions —
Part 1:
Calculation of multi-lobed and tilting
pad journal bearings
Reference number
ISO/TS 31657-1:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO/TS 31657-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/TS 31657-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units . 1
5 General principles, assumptions and preconditions . 7
6 Calculation method . 9
6.1 General . 9
6.2 Load carrying capacity .11
6.3 Frictional power.11
6.4 Lubricant flow rate .12
6.5 Heat balance .13
6.6 Maximum lubricant film temperature .14
6.7 Maximum lubricant film pressure .15
6.8 Operating states .15
6.9 Further influencing parameters .15
6.10 Stiffness and damping coefficients .16
7 Figures .
...
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