1、BRITISH STANDARD BS6955-18: 1994 ISO5347-18: 1993 Calibration of vibration and shock pick-ups Part 18: Method of test for transient temperature sensitivity UDC534.1:681.327.7:53.089.6BS6955-18:1994 This British Standard, having been prepared under the directionof the General Mechanical Engineering S
2、tandards Policy Committee,waspublished undertheauthorityof the StandardsBoardand comesintoeffecton 15March1994 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference GME/21 Draft for comment 87/72304 DC ISBN 0 580 23090 2 Committees responsible for this Brit
3、ish 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 Imperial C
4、ollege 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 Certif
5、ication 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 issued
6、since publication Amd. No. Date CommentsBS6955-18:1994 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Apparatus 1 3 Method 1BS6955-18:1994 ii BSI 11-1999 National foreword This Part of BS6955 has been prepared under the direction of the General
7、 Mechanical Engineering Standards Policy Committee. It is identical with ISO5347-18:1993 Methods for the calibration of vibration and shock pick-ups Part18: Testing of transient temperature sensitivity, published by the International Organization for Standardization (ISO). ISO5347-18 was prepared by
8、 Technical Committee ISO/TC 108, Mechanical vibration and shock, in which the UK played an active part. BS6955 consists of the following Parts, which are identical with the corresponding Parts of ISO5347: Part0: Guide to basic principles; Part1: Methods for primary vibration calibration by laser int
9、erferometry; Part2: Method for primary shock calibration by light cutting; Part3: Method for secondary vibration calibration; Part4: Method for secondary shock calibration; Part5: Method for calibration by Earths gravitation; Part6: Method for primary vibration calibration at low frequencies; Part7:
10、 Methods for primary calibration by centrifuge; Part8: Method for primary calibration by dual centrifuge; Part9: Method for secondary vibration calibration by comparison of phase angles; Part10: Method for primary calibration by high impact shocks; Part11: Method of test for transverse vibration sen
11、sitivity; Part12: Method of test for transverse shock sensitivity; Part13: Method of test for base strain sensitivity; Part14: Method of test for resonance frequency of undamped accelerometers on a steel block; Part15: Method of test for acoustic sensitivity; Part16: Method of test for mounting torq
12、ue sensitivity; Part17: Method of test for fixed temperature sensitivity; Part18: Method of test for transient temperature sensitivity; Part19: Method of test for magnetic field sensitivity. Part20 of ISO5347 is in preparation. It is envisaged that when it is published it will be implemented as Part
13、20 of BS6955. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This docum
14、ent comprises a front cover, an inside front cover, pages i and ii, page1and 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.BS6955-18:1994 BSI 11-1999 1 1 Scope ISO534
15、7 comprises a series of documents dealing with methods for the calibration of vibration and shock pick-ups. This part of ISO5347 lays down detailed specifications for the instrumentation and procedure to be used for transient temperature sensitivity testing. It applies to piezoelectric pick-ups, whe
16、reby pick-up output due to sudden temperature change is measured. 2 Apparatus 2.1 Equipment capable of maintaining room temperature at23 C 3 C. 2.2 Water or alcohol bath, kept at a temperature20 C 1 C lower than actual temperature of the pick-up and with a volume such that the temperature rise durin
17、g immersion of pick-up and its mounting block is limited to 1 C. 2.3 Aluminium block, with a mass ten times the mass of the pick-up. It shall be possible to attach the pick-up to the block by the usual means of attachment. 2.4 D.c. oscilloscope or d.c. recorder, with gigaohm input impedance. 2.5 Rec
18、ommended preamplifier, if any. 2.6 Other apparatus requirements Precautions shall be made to ensure that the bath liquid does not leak into the pick-up, that the electrical leakage resistance is not lowered by the bath liquid at the connector, etc., or that the action of immersion itself does not af
19、fect the output of the pick-up. 3 Method 3.1 Test procedure Connect the pick-up directly to the oscilloscope or recorder without the amplifier, if possible. Quickly immerse the pick-up mounted on the aluminium block into the bath. Measure the maximum output and the time from the start of the transie
20、nt to the maximum. If the output reverses within the first two seconds and reaches a peak of opposite polarity, the magnitude of this peak shall also be recorded. If the pick-up is always used together with a specified amplifier, repeat the test with this amplifier in use. Set the amplifier to its l
21、owest frequency range and note this low-frequency cut-off. 3.2 Expression of results Calculate the transient temperature sensitivity, S tr , expressed (as acceleration) in metres per (second squared per degree Celsius) m/(s 2 / C), using the following formula: where a tr is the change in pick-up out
22、put expressed (as acceleration) in metres per second squared; %t is the difference between the pick-up temperatures, in degrees Celsius, before and after immersion in the bath. S tr a tr %t - =BS6955-18: 1994 ISO5347-18: 1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BS
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