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GB/T 9239.1-2006 English PDF (GBT9239.1-2006)
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GB/T 9239.1-2006: Mechanical vibration -- Balance quality requirements for rotors in a constant (rigid) state -- Part 1: Specification and verification of balance tolerances
GB/T 9239.1-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.120.40
N 73
GB/T 9239.1-2006 / ISO 1940-1.2003
Replacing GB/T 9239-1988
Mechanical vibration - Balance quality requirements
for rotors in a constant (rigid) state - Part 1.
Specification and verification of balance tolerances
(ISO 1940-1.2003, IDT)
ISSUED ON. SEPTEMBER 08, 2006
IMPLEMENTED ON. FEBRUARY 01, 2007
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Pertinent aspects of balancing ... 11
5 Similarity considerations ... 15
6 Specification of balance tolerances ... 20
7 Allocation of permissible residual unbalance to tolerance planes ... 22
8 Allocation of balance tolerances to correction planes ... 24
9 Assembled rotors ... 26
10 Verification of residual unbalance ... 27
Annex A ... 30
Annex B ... 34
Annex C ... 36
Annex D ... 37
Annex E ... 39
Bibliography ... 42
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.
GB/T 9239.2 Mechanical vibration - Balance quality requirements of rigid rotors -
Part 2. Balance errors (GB/T 9239.2-2006, ISO 1940-2. 1997, Mechanical vibration
- Balance quality requirements of rigid rotors - Part 2. Balance errors, IDT)
ISO 1925.2001 Mechanical vibration - Balancing - Vocabulary
3 Terms and definitions
The terms and definitions defined in ISO 1925.2001 apply to this Part of GB/T 9239.
For the convenience of users, some of these definitions are cited below.
NOTE. Some of these definitions are at present under review.
3.1
balancing
Procedure by which the mass distribution of a rotor is checked and, if necessary,
adjusted to ensure that the residual unbalance or the vibration of the journals and/or
forces on the bearings at a frequency corresponding to service speed are within
specified limits.
[ISO 1925.2001, definition 4.1]
3.2
unbalance
Condition which exists in a rotor when vibration force or motion is imparted to its
bearings as a result of centrifugal forces.
[ISO 1925.2001, definition 3.1]
NOTE. The term “unbalance” is sometimes used as the synonym of “unbalanced amount” and
“unbalanced vector”.
3.3
initial unbalance
Unbalance of any kind that exists in the rotor before balancing.
[ISO 1925.2001, definition 3.11]
3.4
residual unbalance
8.1 General
It is strongly recommended to use special reference planes to state balance
tolerances, but many of today's balancing processes still apply balance tolerances at
the correction planes.
Since correction planes are selected in accordance with the correction process, they
usually are not ideal for balance tolerances (see 4.4). If tolerances have to be
allocated to the correction planes, the following two topics are important.
a) Both the magnitude of the residual unbalances and their relative angular
position have an influence on the state of unbalance. Nevertheless, even in
...
Get QUOTATION in 1-minute: Click GB/T 9239.1-2006
Historical versions: GB/T 9239.1-2006
Preview True-PDF (Reload/Scroll if blank)
GB/T 9239.1-2006: Mechanical vibration -- Balance quality requirements for rotors in a constant (rigid) state -- Part 1: Specification and verification of balance tolerances
GB/T 9239.1-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.120.40
N 73
GB/T 9239.1-2006 / ISO 1940-1.2003
Replacing GB/T 9239-1988
Mechanical vibration - Balance quality requirements
for rotors in a constant (rigid) state - Part 1.
Specification and verification of balance tolerances
(ISO 1940-1.2003, IDT)
ISSUED ON. SEPTEMBER 08, 2006
IMPLEMENTED ON. FEBRUARY 01, 2007
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Pertinent aspects of balancing ... 11
5 Similarity considerations ... 15
6 Specification of balance tolerances ... 20
7 Allocation of permissible residual unbalance to tolerance planes ... 22
8 Allocation of balance tolerances to correction planes ... 24
9 Assembled rotors ... 26
10 Verification of residual unbalance ... 27
Annex A ... 30
Annex B ... 34
Annex C ... 36
Annex D ... 37
Annex E ... 39
Bibliography ... 42
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.
GB/T 9239.2 Mechanical vibration - Balance quality requirements of rigid rotors -
Part 2. Balance errors (GB/T 9239.2-2006, ISO 1940-2. 1997, Mechanical vibration
- Balance quality requirements of rigid rotors - Part 2. Balance errors, IDT)
ISO 1925.2001 Mechanical vibration - Balancing - Vocabulary
3 Terms and definitions
The terms and definitions defined in ISO 1925.2001 apply to this Part of GB/T 9239.
For the convenience of users, some of these definitions are cited below.
NOTE. Some of these definitions are at present under review.
3.1
balancing
Procedure by which the mass distribution of a rotor is checked and, if necessary,
adjusted to ensure that the residual unbalance or the vibration of the journals and/or
forces on the bearings at a frequency corresponding to service speed are within
specified limits.
[ISO 1925.2001, definition 4.1]
3.2
unbalance
Condition which exists in a rotor when vibration force or motion is imparted to its
bearings as a result of centrifugal forces.
[ISO 1925.2001, definition 3.1]
NOTE. The term “unbalance” is sometimes used as the synonym of “unbalanced amount” and
“unbalanced vector”.
3.3
initial unbalance
Unbalance of any kind that exists in the rotor before balancing.
[ISO 1925.2001, definition 3.11]
3.4
residual unbalance
8.1 General
It is strongly recommended to use special reference planes to state balance
tolerances, but many of today's balancing processes still apply balance tolerances at
the correction planes.
Since correction planes are selected in accordance with the correction process, they
usually are not ideal for balance tolerances (see 4.4). If tolerances have to be
allocated to the correction planes, the following two topics are important.
a) Both the magnitude of the residual unbalances and their relative angular
position have an influence on the state of unbalance. Nevertheless, even in
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