1、BRITISH STANDARD BS6955-17: 1994 ISO5347-17: 1993 Calibration of vibration and shock pick-ups Part 17: Method of test for fixed temperature sensitivity UDC 534.1:681.327.7:53.089.6BS6955-17:1994 This British Standard, having been prepared under the directionof the General Mechanical Engineering Stan
2、dards 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 23089 9 Committees responsible for th
3、is 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 Imp
4、erial 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
5、 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 Corporation Health and Safety Executive Society of Environmental Engineers University of Cranfield Amendments
6、issued since publication Amd. No. Date CommentsBS6955-17:1994 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 Preferred amplitudes, frequencies and temperatures 1 5 Method 1 List of references Inside back co
7、verBS6955-17:1994 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 ISO5347-17:1993 Methods for the calibration of vibration and shock pick-ups Part 17: Testing of fixed t
8、emperature sensitivity, published by the InternationalOrganization for Standardization (ISO). ISO 5347-17 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 corre
9、sponding 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 calibration;
10、 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 comparis
11、on 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 freque
12、ncy 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 tes
13、t 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 t
14、heir correct application. Compliance with a British Standard 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 3:1994 Methods for secondary vibratio
15、n calibration (Identical) Summary of pages This document comprises 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 amend
16、ment table on the inside front cover.BS6955-17:1994 BSI 11-1999 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 fi
17、xed temperature sensitivity testing. It applies to rectilinear pick-ups. This part of ISO 5347 is applicable for the following parameters: frequency range:20 Hz to 1250 Hz; dynamic range: 0,1 4m to 10 mm (frequency-dependent); 1 mm/s to 1 m/s (frequency-dependent); 10 m/s 2to 1000 m/s 2(frequency-de
18、pendent); temperature range: 45 C to + 800 C. The uncertainty applicable is 10% of reading. 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 va
19、lid. All standards are subject to revision, and parties to agreements based on this 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
20、. ISO 5347-3:1993, Methods for the calibration of vibration and shock pick-ups Part 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 equipment specified for secondary vibration calibration (
21、see ISO 5347-3). The vibrator shall have a fixture with thermal barrier so the test pick-up can be placed inside a temperature chamber and the reference pick-up outside the chamber at laboratory conditions. The temperature influence on the reference pick-up and the fixture transfer function error sh
22、all be less than 0,5% of reading. 3.3 Temperature chamber, designed so that the air temperature in the working space is evenly constant within 3 C for temperatures between 65 C and+ 100 C and within 5 C above 100 C. The temperature of the chamber walls shall not differ from the test temperature by m
23、ore than 10 C at any point. Forced air circulation is recommended. The temperature sensors shall be protected against heat radiation and shall measure the air temperature before the air reaches the pick-up. 3.4 Sensor, for measuring the pick-up temperature, protected against heat radiation. The sens
24、or shall be mounted on the pick-up or, if that is not feasible, on the heat-conducting plate. 4 Preferred amplitudes, frequencies and temperatures Six levels equally covering the pick-up range shall be chosen from the following series. a) Amplitude, in metres per second squared: 1; 2; 5; 10; and the
25、ir multiples of ten; b) Frequency, in hertz: 20; 40; 80; 160; 315; 630; 1250; NOTE 1In cases where a connecting rod is used between the vibrator and temperature chamber, care should be taken to avoid test frequencies at which high transverse motion of the rod occurs. c) Temperature, in degrees Celsi
26、us: 65; 50; 40; 25; 10; 0; + 5; + 40; + 70; +100; + 155; + 200; + 250; + 400; + 800. Preferred values: 25 and + 70. 5 Method 5.1 Test procedure Calibrate the test pick-up in the temperature chamber at laboratory temperature in accordance with a calibration method, usually the secondary vibration cal
27、ibration (see ISO 5347-3). Check calibration frequencies and amplitudes so that limits given for distortion, transverse, bending and rocking acceleration, hum, noise and relative motion are complied with for the two pick-ups.BS6955-17:1994 2 BSI 11-1999 Then adjust the temperature within the chamber
28、 to the specified value and maintain this temperature until the specimen has reached temperature stability, i.e. when the ratio of two consecutive time intervals necessary in order to change the temperature of the pick-up by 3 C exceeds a factor of 1,7. Record the temperature of the reference accele
29、rometer casing. Then measure the calibration factor at specified frequencies and amplitudes. 5.2 Expression of results Estimate the temperature sensitivity as a percentage deviation of the calibration factor relative to the calibration factor at laboratory temperature and at reference frequency and
30、amplitude. Calculate the calibration factor and the uncertainty in accordance with the calibration method chosen (see the relevant part of ISO 5347). Errors caused by the temperature influence on the reference pick-up and the fixture transfer function error which have not been compensated for shall
31、be added to the errors in the relevant uncertainty calculations.BS6955-17:1994 BSI 11-1999 List of references See national foreword.BS6955-17: 1994 ISO5347-17: 1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing
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