ISO 31657-1:2025

International Standard   Current Edition · Approved on 16 October 2025

Plain bearings — Hydrodynamic plain journal bearings under steady-state conditions — Part 1: Calculation of multi-lobed and tilting pad journal bearings

ISO 31657-1:2025 Files

English 38 Pages
Current Edition
OMR 85.13

ISO 31657-1:2025 Scope

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.

The calculation method applies to 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.

Best Sellers

GSO 150-2:2013
 
Gulf Standard
Expiration dates for food products - Part 2 : Voluntary expiration dates
OS GSO 150-2:2013
GSO 150-2:2013 
Omani Standard
Expiration dates for food products - Part 2 : Voluntary expiration dates
OS GSO 9:2022
GSO 9:2022 
Omani Standard
Labeling of prepackaged food stuffs
GSO 9:2022
 
Gulf Technical Regulation
Labeling of prepackaged food stuffs

Recently Published

ISO 20816-3:2026
 
International Standard
Mechanical vibration — Measurement and evaluation of machine vibration — Part 3: Industrial machines with operating speeds between 120 r/min and 30 000 r/min
ISO 20816-1:2026
 
International Standard
Mechanical vibration — Measurement and evaluation of machine vibration — Part 1: General guidelines
ISO 23375:2026
 
International Standard
Intelligent transport systems — Collision evasive lateral manoeuvre systems (CELM) — Requirements and test procedures
ISO 18722-2:2026
 
International Standard
Tobacco heating systems — Determination of aerosol collected mass and nicotine in the aerosol with a puffing regime according to the ISO 5501 series — Part 2: Aerosol heated tobacco products (aHTPs)