BS-6955-7-1994 ISO-5347-7-1993.pdf
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1、BRITISH STANDARD BS 6955-7: 1994 ISO 5347-7: 1993 Calibration of vibration and shock pick-ups Part 7: Methods for primary calibration by centrifuge UDC 534.1:681.327:53.089.6 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-7:1994 Thi
2、s 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 10-1999 The following BSI references relate to the work on this standard:
3、 Committee reference GME/21 Draft for comment 87/72304 DC ISBN 0 580 23097 X 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 which the
4、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 Genera
5、tion 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 Coal Corp
6、oration 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 05:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-7:1994 BSI 10-1999i Contents Page
7、 Committees responsibleInside front cover National forewordii 1Scope1 2Apparatus1 3Preferred values1 4Method 11 5Method 22 Annex A (normative) Calculation of uncertainty3 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:57 GMT+00:00 2006, Uncontrolled
8、Copy, (c) BSI BS 6955-7:1994 ii BSI 10-1999 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 5347-7:1993 Methods for the calibration of vibration and shock pick-ups Part 7: Primary
9、calibration by centrifuge published by the International Organization for Standardization (ISO). ISO 5347-7 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 cor
10、responding Parts of 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 calibratio
11、n; Part 5: Method 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 compar
12、ison of phase angles; 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 freq
13、uency of undamped 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 t
14、est for magnetic field 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
15、 their correct application. 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 6, an inside back cover and a back cover. This standard has been updated
16、 (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-7:1994 BSI 10-19991 1 Scope ISO 5347 comprises a
17、 series of documents dealing with methods 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. This part of ISO 5347 applie
18、s to rectilinear accelerometers with zero-frequency response, mainly of the strain gauge or piezoresistive type, and to primary standard and working pick-ups. It is applicable for a calibration range from 10 m/s2 to 1 000 m/s2 (higher accelerations possible) at 0 Hz. The limits of uncertainty applic
19、able are 1 % of reading. 2 Apparatus 2.1 Equipment capable of maintaining room temperature at 23 C 3 C. 2.2 Balanced table or arm, rotating about a vertical axis with uniform angular speed. For the calibration range from 10 m/s2 to 100 m/s2 the table/arm shall be level within 0,5 of horizontal. For
20、ranges higher than 100 m/s2, levelling is allowed to within 2. The rotational frequency shall be uniform within 0,05 % of the nominal value. The pick-up axis of sensitivity shall be aligned within 0,5. The radius of rotation to the centre of the pick-up mass element shall be measured with an uncerta
21、inty less than 0,1 %. If the accelerometer is substituted by impedances not sensitive to acceleration, the hum and noise when the centrifuge is rotating at the calibration speeds shall be at least 60 dB below reading. 2.3 Instrumentation for measuring rotational frequency, With an uncertainty of max
22、imum 0,05 % of reading. 2.4 Voltage instrumentation for measuring accelerometer d.c. output, with an uncertainty of maximum 0,01 % of reading. 3 Preferred values Six acceleration values, in metres per second squared, equally covering the accelerometer range, shall be chosen from the following series
23、: 10; 20; 50; 100; 200; 500 or their multiples of ten. The reference acceleration shall be 100 m/s2 (second choice: 50 m/s2). 4 Method 1 (with measurement of the radius of rotation) 4.1 Test procedure Rotate the table or arm at different frequencies determined by calculation from the standard levels
24、 using the following formula: a = 42n2r Measure the pick-up output for every level. Determine the reference calibration factor at the reference acceleration. Then determine the sensitivity for the other calibration amplitudes. The results shall be given as a percentage deviation from the reference c
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