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1、BRITISH STANDARD BS 6955-14: 1994 ISO 5347-14: 1993 Calibration of vibration and shock pick-ups Part 14: Method of test for resonance frequency of undamped accelerometers on a steel block UDC 534.1:681.327.7:53.089.6 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:35 GMT+00:00 2006, Unc
2、ontrolled Copy, (c) BSI BS 6955-14:1994 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 refe
3、rences relate to the work on this standard: Committee reference GME/21 Draft for comment 87/72304 DC ISBN 0 580 23086 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to
4、Technical Committee GME/21, upon which 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 Minis
5、try of Defence Open University Power 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
6、subcommittees and panels: British Coal 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 05:16:35 GMT+00:00 2006, Uncontrolled Copy, (c) BS
7、I BS 6955-14:1994 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Apparatus1 3Method1 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-14:1994 ii BSI 11-1999 National foreword This Part
8、 of BS 6955 has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee. It is identical with ISO 5347-14:1993 Methods for the calibration of vibration and shock pick-ups Part 14: Resonance frequency testing of undamped accelerometers on a steel block, publ
9、ished by the International Organization for Standardization (ISO). ISO 5347-14 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 of ISO 5347:
10、 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 for calibra
11、tion 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 angles; Part 10
12、: 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 acceleromet
13、ers 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 field sensit
14、ivity. 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 application. C
15、ompliance 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, page 1 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpo
16、rated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6955-14:1994 BSI 11-19991 1 Scope ISO 5347 comprises a series of documents dealing with methods for the calibr
17、ation of vibration and shock pick-ups. This part of ISO 5347 lays down detailed specifications for the instrumentation and procedure to be used for resonance frequency testing. It is a very limited method applicable exclusively to undamped accelerometers, mainly of the piezoelectric type, having a m
18、ass of less than 30 g. This part of ISO 5347 is applicable for a frequency range from 1 kHz to 50 kHz. The general method for resonance frequency determination, by frequency sweeping and measuring sensitivity as a function of frequency, will be dealt with in a future part of ISO 5347. 2 Apparatus 2.
19、1 Equipment capable of maintaining room temperature at 23 C 3 C. 2.2 Steel block, 28 mm 28 mm 28 mm, having a mass of about 180 g. The surface of the block on which the accelerometer is to be mounted shall have a roughness value, expressed as the arithmetical mean deviation, Ra, of 1 4m. The flatnes
20、s shall be such that the surface is contained between two parallel planes at a distance apart of 5 4m. The drilled and tapped holes for connecting the pick-up shall have a perpendicularly tolerance to the surface of 10 4m, i.e. the centreline of the hole shall be contained in a cylindrical zone of 1
21、0 4m diameter and a height equal to the hole depth. 2.3 Memory frequency analyser or oscilloscope, having the following characteristics: frequency range: 1 Hz to 50 Hz; uncertainty for frequency: 5 % of reading. 3 Method 3.1 Test procedure Mount the accelerometer and its fixture on the steel block i
22、n accordance with the manufacturers instructions. Suspend the accelerometer by its cable and strike the steel block with a hammer. Measure the lowest resonance frequency in the measuring and the transverse directions. It should be noted that it can be very difficult to distinguish between axial and
23、transverse resonances. The nature of the hammer surface and its dimensions may alter the results. More reliable results are obtainable by using a type of hammer instrumented by an accelerometer and a memory FFT analyser, and thus obtaining the results as a transfer function. 3.2 Expression of result
24、s The results shall be reported as mounted resonance frequency, in kilohertz, on a 180 g steel block. For frequencies above 50 kHz, the manufacturer shall specify the size, mass, material and first resonance frequency of the block. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:16:35 GMT+
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