GB/T 9239.1-2006Mechanical vibration -- Balance quality requirements for rotors in a constant (rigid) state -- Part 1: Specification and verification of balance tolerances (English PDF)

Foreword

GB/T 9239 "Mechanical vibration - Balance quality requirements for rotors in a

constant (rigid) state" consists of the following two parts:

— Part 1: Specification and verification of balance tolerances;

— Part 2: Balance errors.

This Part is Part 1 of GB/T 9239.

This Part is identical to ISO 1940-1:2003 "Mechanical vibration - Balance quality

requirements for rotors in a constant (rigid) state - Part 1: Specification and verification

of balance tolerances" (English version, Second edition).

This Part is drafted in accordance with ISO 1940-1:2003 and its technical

corrigendum 1 published in 2005 by using translation method. The text structure and

technical content are consistent with that of ISO 1940-1:2003.

For convenience of use, this Part has made the following editorial modifications:

— DELETE the foreword of ISO 1940-1:2003;

— REPLACE the decimal point symbol "," with the decimal point symbol ".";

— MODIFY the introductory phrase in Clause 2 "Normative references";

— The international standards referenced in Clause 2 of ISO 1904-1:2003 are

changed into the corresponding national standards directly referenced by this

Part;

— CORRECT the misprints (see the footnote of A.3).

This Part replaces GB/T 9239-1988 "Balance quality of rigid rotors - Determination of

permissible residual unbalance".

This Part has made the following modifications to GB/T 9239-1988:

— MODIFY the standard name;

— ADD table of contents, foreword, introduction, and normative references;

— ADJUST the overall structure of the standard according to ISO 1940-1:2003;

— REDEFINE parts of terms;

— INTRODUCE reference planes for balance tolerances; tolerance planes replace

the using correction planes;

— DELETE some examples;

— MODIFY the Annex A;

— MODIFY the Annex B;

— ADD Annex C, Annex D, and Annex E;

— ADD the bibliography.

Annex A, Annex B, Annex C, Annex D, and Annex E of this Part are informative.

This Part was proposed by China Machinery Industry Federation.

This Part shall be under the jurisdiction of National Standardization Technical

Committee of Mechanical Vibration and Impact.

Responsible drafting organization of this Part: Changchun Institute of Test Machine.

Participating drafting organizations of this Part: Xiaogan Songlin International

Measuring Device Co., Ltd., Changchun Zhonglian Test Equipment Co., Ltd.,

Shanghai Schenck Machinery Co., Ltd., No. 6354 Institute of China State Shipbuilding

Corporation, and Zhengzhou Machinery Research Institute.

Main drafters of this Part: Liu Zhili, Zhang Shimin, Shao Chunping, Wang Chaorong,

Yang Dechun, and Huang Runhua.

The historical version replaced by this Part is as follows:

— GB/T 9239-1988.

Mechanical vibration - Balance quality requirements

for rotors in a constant (rigid) state - Part 1:

Specification and verification of balance tolerances

1 Scope

This Part of GB/T 9239 gives specifications for rotors in a constant (rigid) state. It

specifies:

a) balance tolerances,

b) the necessary number of correction planes, and

c) methods for verifying the residual unbalance.

Recommendations are also given concerning the balance quality requirements for

rotors in a constant (rigid) state, according to their machinery type and maximum

service speed. These recommendations are based on worldwide experience.

This Part of GB/T 9239 is also intended to facilitate the relationship between the

manufacturer and user of rotating machines, by stating acceptance criteria for the

verification of residual unbalances.

Detailed consideration of errors associated with balancing and verification of residual

unbalance are given in GB/T 9239.2.

This Part of GB/T 9239 does not cover rotors in a flexible state. The balance quality

requirements for rotors in a flexible state are covered by GB/T 6557.

2 Normative references

The provisions in following documents become the provisions of this Part through

reference in this Part of GB/T 9239. For dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this Part, however,

parties who reach an agreement based on this Part are encouraged to study if the

latest versions of these documents are applicable. For undated references, the latest

edition of the referenced document applies.

9 Assembled rotors