BS-6955-8-1994 ISO-5347-8-1993.pdf
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1、BRITISH STANDARD BS 6955-8: 1994 ISO 5347-8: 1993 Calibration of vibration and shock pick-ups Part 8: Method for primary calibration by dual centrifuge UDC 534.1:681.327.7:53.089.6 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:17:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-8:19
2、94 This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 March 1994 BSI 11-1999 The following BSI references relate to the work on this sta
3、ndard: Committee reference GME/21 Draft for comment 87/72304 DC ISBN 0 580 23098 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/21, upon whic
4、h the following bodies were represented: Electricity Association Federation of Civil Engineering Contractors Imperial College of Science and Technology Institute of Sound and Vibration Research Institution of Mechanical Engineers Lloyds Register of Shipping Ministry of Defence Open University Power
5、Generation Contractors Association PGCA (BEAMA Ltd.) Railway Industry Association of Great Britain Sira Test and Certification Ltd. Society of British Aerospace Companies Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Coa
6、l Corporation Health and Safety Executive Society of Environmental Engineers University of Cranfield Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:17:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-8:1994 BSI 11-1999i Content
7、s Page Committees responsibleInside front cover National forewordii 1Scope1 2Apparatus1 3Preferred amplitudes and frequencies1 4Method1 Annex A (normative) Calculation of uncertainty2 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:17:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-8
8、:1994 ii BSI 11-1999 National foreword This Part of BS 6955 has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee. It is identical with ISO 5347-8:1993 Methods for the calibration of vibration and shock pick-ups Part 8: Primary calibration by dual cen
9、trifuge published by the International Organization for Standardization (ISO). ISO 5347-8 was prepared by Technical Committee ISO/TC 108, Mechanical vibration and shock, in which the UK played an active part. BS 6955 consists of the following Parts, which are identical with the corresponding Parts o
10、f ISO 5347: Part 0: Guide to basic principles; Part 1: Methods for primary vibration calibration by laser interferometry; Part 2: Method for primary shock calibration by light cutting; Part 3: Method for secondary vibration calibration; Part 4: Method for secondary shock calibration; Part 5: Method
11、for calibration by Earths gravitation; Part 6: Method for primary vibration calibration at low frequencies; Part 7: Methods for primary calibration by centrifuge; Part 8: Method for primary calibration by dual centrifuge; Part 9: Method for secondary vibration calibration by comparison of phase angl
12、es; Part 10: Method for primary calibration by high impact shocks; Part 11: Method of test for transverse vibration sensitivity; Part 12: Method of test for transverse shock sensitivity; Part 13: Method of test for base strain sensitivity; Part 14: Method of test for resonance frequency of undamped
13、accelerometers on a steel block; Part 15: Method of test for acoustic sensitivity; Part 16: Method of test for mounting torque sensitivity; Part 17: Method of test for fixed temperature sensitivity; Part 18: Method of test for transient temperature sensitivity; Part 19: Method of test for magnetic f
14、ield sensitivity. Part 20 of ISO 5347 is in preparation. It is envisaged that when it is published it will be implemented as Part 20 of BS 6955. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct app
15、lication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had a
16、mendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:17:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-8:1994 BSI 11-19991 1 Scope ISO 5347 comprises a series of documents dealing with method
17、s for the calibration of vibration and shock pick-ups. This part of ISO 5347 lays down detailed specifications for the instrumentation and procedure to be used for primary calibration of accelerometers using centrifuge calibration. It applies to all types of rectilinear accelerometers, primary stand
18、ards and working pick-ups. This part of ISO 5347 is applicable for a frequency range from 0,7 Hz to 10 Hz and a dynamic range from 10 m/s2 to 100 m/s2. The limits of uncertainty applicable are 2 % of reading. 2 Apparatus 2.1 Equipment capable of maintaining room temperature at 23 C 3 C. 2.2 Balanced
19、 table, rotating about a vertical axis with uniform angular speed. A smaller table rotating with independent and uniform angular speed in the reverse direction shall be mounted eccentrically and perpendicularly on the table. The tables shall be levelled within 0,5. The angular speed of the larger ta
20、ble shall be uniform within 0,1 %. The angular speed of the smaller table shall be uniform within 1 %. The distance between the centres of rotation of the two tables shall be measured with an uncertainty of less than 0,1 %. The centre of the pick-up mass element shall be located at the centre of rot
21、ation of the smaller table with an uncertainty of less than 0,1 % of the distance between the axes of rotation of the two tables. 2.3 Instrumentation for measuring rotational frequency, with an uncertainty of maximum 0,1 % of reading. 2.4 Voltage instrumentation for measuring true r.m.s. acceleromet
22、er output, with an uncertainty of maximum 0,1 % of reading. The r.m.s. value shall be multiplied by a factor of to obtain (single) amplitude used in the formulae. 3 Preferred amplitudes and frequencies The following amplitudes, in metres per second squared, shall be used: 10; 20; 50; 100. The follow
23、ing frequencies, in hertz, shall be used: 0,7; 1; 2; 5; 10. The reference acceleration shall be 100 m/s2 (second choice: 50 m/s2) and the frequency shall be 5 Hz (second choice: 1 Hz). 4 Method 4.1 Test procedure Rotate the larger table at different frequencies determined by calculation of the calib
24、ration acceleration, a, in metres per second squared, from the standard levels using the following formula: a = 4 ;2 n2 r + k Set the smaller table to the calibration frequency. Determine the calibration factor at the reference frequency and reference acceleration. Then determine the sensitivity at
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