1、BRITISH STANDARD BS6955-16: 1994 ISO5347-16: 1993 Calibration of vibration and shock pick-ups Part 16: Method of test for mounting torque sensitivity UDC 534.1:681.327.7:53.089.6BS6955-16:1994 This British Standard, having been prepared under the directionof the General Mechanical Engineering Standa
2、rds Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15 March 1994 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference GME/21 Draft for comment 87/72304 DC ISBN 0 580 23088 0 Committees responsible for this
3、 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 following bodies were represented: Electricity Association Federation of Civil Engineering Contractors Imper
4、ial 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 Generation Contractors Association PGCA (BEAMA Ltd.) Railway Industry Association of Great Britain Sira Test and C
5、ertification 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 Corporation Health and Safety Executive Society of Environmental Engineers University of Cranfield Amendments is
6、sued since publication Amd. No. Date CommentsBS6955-16:1994 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative reference 1 3 Apparatus 1 4 Method 1 List of references Inside back coverBS6955-16:1994 ii BSI 11-1999 National foreword This P
7、art of BS 6955 has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee. It is identical with ISO5347-16:1993 Methods for the calibration of vibration and shock pick-ups Part 16: Testing of mounting torque sensitivity, published by the InternationalOrgan
8、ization for Standardization (ISO). ISO 5347-16 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: Part 0: Guide to basic principl
9、es; 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 calibration by Earths gravitation; Part
10、 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: Method for primary calibration
11、 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 accelerometers on a steel block; Part 15: M
12、ethod 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 sensitivity. Part 20 of ISO 5347 is in
13、 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. Compliance with a British Standar
14、d does not of itself confer immunity from legal obligations. Cross-reference International Standard Corresponding British Standard ISO 5347-3:1993 BS 6955 Calibration of vibration and shock pick-ups Part 16:1994 Methods for secondary vibration calibration (Identical) Summary of pages This document c
15、omprises a front cover, an inside front cover, pagesi andii, pages1and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6955-16:1994 BSI 11
16、-1999 1 1 Scope ISO 5347 comprises a 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 mounting torque sensitivity testing. It applies to pick-ups
17、that are mounted by screws, bolts or other threaded fasteners. The change in calibration factor due to the mounting torque is determined. This part of ISO 5347 is applicable for a mounting torque range of one-half of the specified value, the specified value and twice the value of the specified mount
18、ing torque. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 5347. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on t
19、his part of ISO 5347 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5347-3:1993, Methods for the calibration of vibration and shock pick-ups P
20、art 3: Secondary vibration calibration. 3 Apparatus 3.1 Equipment capable of maintaining room temperature at 23 C 3 C. 3.2 Vibration equipment, complying with the requirements specified for secondary vibration calibration (see ISO 5347-3). The thickness of the steel fixture on which the pick-up is t
21、o be mounted shall be at least three times the length of the mounting screws, with a minimum plate thickness of 20 mm. The surface of the fixture shall have a roughness value, expressed as the arithmetical mean deviation, R a , 1 4m. The flatness shall be such that the surface shall be contained bet
22、ween two parallel planes 5 4m apart. The drilled and tapped holes for connecting the pick-up shall have a perpendicularity tolerance to the surface of less than 10 4m, i.e. the centreline ofthe hole shall be contained in a cylindrical zone of104m diameter and a height equal to the hole depth. 3.3 To
23、rque-measuring equipment, giving a maximum total mounting torque error 15% of reading. 4 Method 4.1 Test procedure The interface and thread lubrication normally recommended shall be used and stated. The torque shall be applied from zero torque to each of the three test torques (see clause 1) in one
24、continuous procedure. Determine the calibration factor for the reference frequency and the reference amplitude for the three test torques. 4.2 Expression of results Calculate the torque sensitivity, S T , expressed as a percentage, using the following formula: where The maximum value for the torque
25、sensitivity shall be reported. S x is the calibration factor at one-half of or at twice the specified mounting torque; S is the calibration factor at the specified mounting torque. S T S x S S - 100 =2 blankBS6955-16:1994 BSI 11-1999 List of references See national foreword.BS6955-16: 1994 ISO5347-1
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