ISO 20816-9:2020 機械的振動—機械振動の測定と評価—パート9：ギアユニット | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 108, Mechanical vibration, shock and condition monitoring, Subcommittee SC 2, Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures.

This first edition of ISO 20816-9 cancels and replaces ISO 8579-2:1993, which has been technically revised.

The main changes compared to ISO 8579-2:1993 are as follows:

• It has been re-formatted to match other parts of the ISO 20816 series and includes zones A to D.

— It has two new tables for values of vibration and displacement at zone boundaries.

— A table with values for vibration acceleration rating at zone boundaries has also been included.

— The classifications table has been revised, referring to these new rating tables.

— The displacement and velocity rating graphs have been moved into an informative annex.

A list of all parts in the ISO 20816 series can be found on the ISO website.

Introduction

ISO 20816-1 is the part of the ISO 20816 series that gives the general requirements for evaluating the vibration of various machine types when the vibration measurements are made on both non-rotating parts and rotating shafts.

ISO 20816-9 (this document) provides specific provisions for assessing the vibration of individually housed, enclosed, speed increasing or speed reducing gear units. It can be used for acceptance testing, and, by agreement between manufacturer and customer and/or operator, for guidance for routine operational measurements.

Guidance is provided for assessing the vibration of gear units when operating under steady-state conditions and considering the magnitude of the observed vibration. However, no criteria are provided for transient operating conditions.

The evaluation procedures presented in this document are based on broad-band measurements. However, because of advances in technology, the use of narrow-band measurements or spectral analysis has become increasingly widespread, particularly for the purposes of vibration evaluation, condition monitoring and diagnostics. The specification of criteria for such measurements is beyond the scope of this document. They are provided in greater detail in the relevant parts of the ISO 13373 series which establish requirements for the vibration condition monitoring of machines.

1 Scope

This document specifies requirements for determining and classifying mechanical vibration of individually housed, enclosed, speed increasing or speed reducing gear units. It specifies methods for measuring housing and shaft vibrations, and the types of instrumentation, measurement methods and testing procedures for determining vibration magnitudes. Vibration grades for acceptance are included.

Torsional vibration measurements are outside the scope of this document.

It applies to a gear unit operating within its design speed, load, temperature range and lubrication for acceptance testing at the manufacturer's facility. By agreement between manufacturer and customer and/or operator, it can be used for guidelines for on-site acceptance testing and for routine operational measurements.

This document applies to gear units of nominal power rating from 10 kW to 100 MW and nominal rotational speeds between 30 r/min and 12 000 r/min (0,5 Hz to 200 Hz).

This document does not apply to special or auxiliary drive trains, such as integrated gear-driven compressors, pumps, turbines, etc., or gear type clutches used on combined-cycle turbo generators and power take-off gears.

The evaluation criteria provided in this document can be applied to the vibration of the main input and output bearings of the gearbox and to the vibration of internal shaft bearings. They can have limited application to the evaluation of the condition of those gears. Specialist techniques for evaluating the condition of gears are outside the scope of this document.

This document establishes provisions under normal steady-state operating conditions for evaluating the severity of the following in-situ broad-band vibration:

• a) structural vibration at all main bearing housings or pedestals measured radially (i.e. transverse) to the shaft axis;
• b) structural vibration at thrust bearing housings measured in the axial direction;
• c) vibration of rotating shafts radially (i.e. transverse) to the shaft axis at, or close to, the main bearings;
• d) structural vibration on the gear casing.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 2041 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography