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1、J IS JAPANESE IN DU STR IAL STANDARD Translated and Published by Japanese Standards Association (IS0 7919-1 : 1 6 ) Mechanical vibration of non-reci procat i ng rnac hines - Measurements on rotating shafts and evaluation criteria - General guidelines ICs 17.160 Descriptors : shafts (rotating), rotat
2、ing electric machines, rotary engines, vibration testing, Reference number : JIS B 0910 : 1999 (E) vibration measurement, vibration PROTECTED BY COPYRIGHT 14 S Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
3、Resale, 03/15/2007 19:23:00 MDTNo reproduction or networking permitted without license from IHS -,-,- B O910 : 1999 (IS0 7919-111996) Foreword This translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry through del
4、iberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. In this establishment, IS0 7919-1:1996 was adopted as the Japanese Industrial Standard in accordance with the systematization of the corresponding International Standards. Date of Establi
5、shment: 1999-03-20 Date of Public Notice in Official Gazette: 1999-03-23 Investigated by: Japanese Industrial Standards Committee Divisional Council on Machine Elements JIS B 0910 :1999, First English edition published in 2002-08 Translated and published by: Japanese Standards Association 4-1-24, Ak
6、asaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic o
7、r mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007
8、 19:23:00 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B O910 : 1999 (IS0 7919-1 : 1996) Mechanical vibration of non-reciprocating machines - Measurements on rotating shafts and evaluation criteria - General guidelines Introduction This J
9、apanese Industrial Standard has been prepared based on the second edition of IS0 7919-1 Mechanical vibration of non-reciprocating machines -Measure- ments on rotating shafts and evaluation criteria- Part 1: General guidelines published in 1996 without modifymg the technical contents. The portions un
10、derlined with dots are the matters not stated in the original Interna- tional Standard. This Standard provides general guidelines for measurements and evaluation criteria of mechanical vibration measured at rotating parts of manufactured machines. The In- ternational Standard IS0 7919 specifies meas
11、urements and evaluation criteria on re- spectively classified machines in the first and the following parts. This Standard corre- sponding to IS0 7919-1 specifies the constitution of series of the Standard and applica- tion methods of each part. Machines are now being operated at increasingly high s
12、peeds and loads, and under increasingly severe operating conditions. At present, it is not uncommon for continuous operation to be expected and required for 2 or 3 years between maintenance operations. Consequently, more restrictive requirements are being specied for operating vibration values of ro
13、tating machinery, in order to ensure continued safe and reliable operation. JIS B 0906 establishes a basis for the evaluation of mechanical vibration of machines by measuring the vibration response on non-rotating, structural members only. For such machines as those containing flexible rotor shaft s
14、ystems, however, measurements on non-rotating parts may not adequately characterize the running condition of the machine. In such cases, it may be necessary to monitor the machine using measurements on the rotating and non-rotating parts, or on the rotating parts alone. Shaft vibration measurements
15、are used for a number of purposes, ranging from rou- tine operational monitoring and acceptance tests to advanced experimental testing, as well as diagnostic and analytical investigations. This Standard is designed to provide guidelines primarily for operational monitoring and acceptance tests. 1 Sc
16、ope This Standard sets out general guidelines for measuring and evaluating ma- chinery vibration by means of measurements made directly on rotating shafts for the purpose of determining shaft vibration with regard to a) b) excessive kinetic load ; c) the monitoring of radial clearances. It is applic
17、able to measurements of both absolute and relative radial shaft vibration, but excludes torsional and axial shaft vibration. The procedures are applicable for both operational monitoring of machines and to acceptance testing on a test stand and after installation. Guidelines are also presented for s
18、etting operational limits. changes in vibrational behaviour ; PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:23:00 MDTNo reproduction or networking permitted with
19、out license from IHS -,-,- 2 B 0910 1999 (IS0 7919-1 : 1996) Remarks 1. Evaluation criteria for different classes of machinery will be included in other parts of IS0 7919. In the meantime, guidelines are given in annex A. 2. The term“shaft vibration“is used throughout IS0 7919 because, in most cases
20、, measurements will be made on machine shafts ; however, IS0 7919 is also applicable to measurements made on other rotating ele- ments if such elements are found to be more suitable, provided that the guidelines are respected. For the purposes of IS0 7919, operational monitoring is considered to be
21、those vibra- tion measurements made during the normal operation of a machine. IS0 7919 permits the use of several different measurement quantities and methods, provided that they are well defined and their limitations are set out, so that the interpretation of the measure- ments will be well underst
22、ood. This Standard does not apply to reciprocating machinery. 2 Normative reference The following standard contains provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent edi- tion of the standard shall be applied. JIS B 0906 Mechanical vibratio
23、n -Evaluation of machine Remarks : IS0 10816-1: 1995 Mechanical vibration - Evaluation of machine vibra- tion by measurements on non-rotating parts -Part 1:General guidelines is identical with the said standard. 3 Measurements 3.1 Measurement quantities 3.1.1 Displacement The preferred measurement q
24、uantity for the measurement of shaft vibration is displacement. The unit of measurement is the micrometer (lpn=lO-m). Remarks : Displacement is a vector quantity and, therefore, when comparing two displacements, it may be necessary to consider the phase angle be- tween them (see also annex D). Since
25、 this Standard applies to both relative and absolute shaft vibration measure- ments, displacement is further defined as follows: a) relative displacement, which is the vibratory displacement between the shaft and appropriate structure, such as a bearing housing or machine casing ; or absolute displa
26、cement, which is the vibratory displacement of the shaft with refer- ence to an inertial reference system. b) Remarks : It should be clearly indicated whether displacement values are relative or absolute. Absolute and relative displacements are further defined by several different displace- ment qua
27、ntities, each of which is now in widespread use. These include : PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:23:00 MDTNo reproduction or networking permitted w
28、ithout license from IHS -,-,- 3 B O910 : 1999 (IS0 7919-1 : 1996) S!p-p) vibratory displacement peak-to-peak in the direction of measurement; S, maximum vibratory displacement in the plane of measurement. Either of these displacement quantities may be used for the measurement of shaft vibration. How
29、ever, the quantities shall be clearly identified so as to ensure correct inter- pretation of the measurements in terms of the criteria of clause 5. The relationships be- tween each of these quantities are shown in Figs. B. l and B.2. Remarks : At present, the greater of the two values for peak-to-pe
30、ak displacement, as measured in two orthogonal directions, is used for evaluation criteria. In future, as relevant experience is accumulated, the quantity Sh-p)max, defined in Fig. B.2, may be preferred. 3.1.2 Frequency range The measurement of relative and absolute shaft vibration shall be broad ba
31、nd so that the frequency spectrum of the machine is adequately covered (). 3.2 Types of measurement 3.2.1 Relative vibration measurements Relative vibration measurements are gener- ally carried out with a non-contacting transducer which senses the vibratory displace- ment between the shaft and a str
32、uctural member (e.g. the bearing housing ) of the ma- chine. 3.2.2 Absolute vibration measurements Absolute vibration measurements are carried out by one of the following methods: a) seismic transducer (2) by a shaft-riding probe, on which a seismic transducer (veloc- ity type or accelerometer) is m
33、ounted so that it measures absolute shaft vibration di- rectly ; or b) by a non-contacting transducer which measures relative shaft vibration in combina- tion with a seismic transducer (velocity type or accelerometer) which measures the support vibration. Both transducers shall be mounted close toge
34、ther so that they un- dergo the same absolute motion in the direction of measurement. Their conditioned outputs are vectorially summed to provide a measurement of the absolute shaft mo- tion. 3.3 Measurement procedures 3.3.1 It is desirable to locate transducers at positions such that the lateral mo
35、vement of the shaft at points of importance can be assessed. It is recommended that, for both relative and absolute measurements, two transducers should be located at, or General Footnotes (l) Vibration data obtained without passing through the filter for detecting characteristic frequency elements.
36、 (7 The seismic transducer means a vibration transducer of spring-mass sys- tem. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:23:00 MDTNo reproduction or networ
37、king permitted without license from IHS -,-,- 4 B O910 : 1999 (IS0 7919-1 : 1996) adjacent to, each machine bearing. They should be radially mounted in the same trans- verse plane perpendicular to the shaft axis or as close as practicable, with their axes within f 5“ of a radial line. It is preferab
38、le to mount both transducers 90“ k 5“ apart on the same bearing half and the positions chosen should be the same at each bearing. A single transducer may be used at each measurement plane in place of the more typi- cal pair of orthogonal transducers if it is known to provide adequate information abo
39、ut the shaft vibration. It is recommended that special measurements be made in order to determine the total non-vibration runout, which is caused by shaft surface metallurgical non-homogeneities, local residual magnetism and shaft mechanical runout (“. It should be noted that, for asymmetric rotors,
40、 the effect of gravity can cause a false runout signal. Recommendations for instrumentation are given in annex C. 3.3.2 Procedures for relative vibration measurements Relative vibration transducers of the non-contacting type are normally mounted in tapped holes in the bearing housing, or by rigid br
41、ackets adjacent to the bearing housing. Where the transducers are mounted in the bearing, they should be located so as not to interfere with the lubrication pressure wedge. However, special arrangements for mounting transducers in other axial locations may be made, but different vibration criteria f
42、or assessment will then have to be used. For bracket-mounted transducers, the bracket shall be free from natural frequencies which adversely affect the capability of the transducer to measure the relative shaft vi- bration. The surface of the shaft at the location of the pick-up, taking into account
43、 the total axial float of the shaft under all thermal conditions, shall be smooth and free from any geometric discontinuities (such as keyways, lubrication passages and threads), metallur- gical non-homogeneities and local residual magnetism which may cause false signals. In some circumstances, an e
44、lectroplated or metallized shaft surface may be acceptable, but it should be noted that the calibration may be different. It is recommended that the total combined electrical and mechanical runout, as measured by the transducer, should not exceed 25 % of the allowable vibration displacement, specifi
45、ed in accordance with annex A, or 6 pm, whichever is the greater. For measurements made on machines already in serv- ice, where provision was not originally made for shaft vibration measurements, it may be necessary to use other runout criteria. 3.3.3 Procedures for absolute vibration measurements u
46、sing combined seismic and non-contacting relative vibration transducers If a combination of seismic and non- contacting relative vibration transducers is used, the absolute vibration is obtained by vectorially summing the outputs from both transducers. The mounting and other re- quirements for the n
47、on-contacting transducer are as specified in 3.3.2. In addition, the seismic transducer shall be rigidly mounted to the machine structure (e.g. the bearing Footnote (3) Runout denotes the signals similar to the vibration, which are occured by other cause than vibrations. PROTECTED BY COPYRIGHT Copyr
48、ight Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:23:00 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 1999 (IS0 7919-1 : 1996) B O910 housing) close to the non-con
49、tacting transducer so that both transducers undergo the same absolute vibration of the support structure in the direction of measurement. The sensitive axes of the non-contacting and seismic transducers shall be parallel, so that their vectorially summed, conditioned signals result in an accurate measure of the abso- lute shaft vibr