ISO 21250-4:2020
Rolling bearings — Noise testing of rolling bearing greases — Part 4: Test and evaluation method NQ
This document specifies the testing and evaluation method of rolling bearing grease noise in accordance with the method NQ.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, abbreviated terms and subscripts
5 Calculation method
5.1 Signal processing
5.2 Peak detection
6 Test method NQ
6.1 Measuring principle
6.2 Testing procedure
7 Evaluation of results
Annex A (informative) Test machine
Annex B (informative) Calibration
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, abbreviated terms and subscripts
5 Calculation method
5.1 Signal processing
5.2 Peak detection
6 Test method NQ
6.1 Measuring principle
6.2 Testing procedure
7 Evaluation of results
Annex A (informative) Test machine
Annex B (informative) Calibration
Bibliography