BS-AU-228-2-1989 ISO-8721-1987.pdf
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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 228-2: 1989 ISO 8721:1987 Impact tests on road vehicles Part 2: Specification for measurement techniques using optical instrumentation ISO title: Road vehicles Measurement techniques in impact tests Optical instrumentation UDC 629.11:620.1/.111.1 Licensed Cop
2、y: London South Bank University, London South Bank University, Sat Dec 09 02:05:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 228-2:1989 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI
3、and comes into effect on 31 March 1989 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference AUE/7 Draft for comment 86/77884 DC ISBN 0 580 16859 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by t
4、he Automobile Standards Committee (AUE/-) to Technical Committee AUE/7 upon which the following bodies were represented: Association for Consumer Research Automobile Association Child Accident Prevention Trust Consumer Policy Committee of BSI Department of Transport (Highways) Department of Transpor
5、t (Transport and Road Research Laboratory) Institute for Consumer Ergonomics Ltd. Man-made Fibres Producers Committee Medical Research Council Ministry of Defence Motor Industry Research Association National Automobile Safety Belt Association Royal Automobile Club Royal Society for the Prevention of
6、 Accidents Society of Motor Manufacturers and Traders Ltd. University of Birmingham Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:05:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 228-2:
7、1989 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2Reference1 3Definitions1 4Performance1 Annex Distortion index measurement methods2 Figure Target for distortion index determination3 Publications referred toInside back cove
8、r Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:05:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 228-2:1989 ii BSI 01-2000 National foreword This Part of BS AU 228 has been prepared under the direction of the Automobile Standards Committee and is iden
9、tical with ISO 8721:1987 “Road vehicles Measurement techniques in impact tests Optical instrumentation”, published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a Briti
10、sh Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline
11、 as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Part of BS AU 228”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
12、application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International StandardCorresponding British Standard ISO 6487:1987BS AU 228 Impact tests on road vehicles Part 1:1988 Specification for measurement techniques and general instru
13、mentation (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, 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 amendm
14、ent table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:05:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 228-2:1989 BSI 01-20001 1 Scope and field of application This International Standard defines performance criteria for a
15、n optical data channel used in impact tests on road vehicles, when numerical time and space data are taken from the images to analyse impact test results. The requirements are to facilitate comparison between results obtained by different laboratories. The annex gives a method of measuring the disto
16、rtion index as a quality parameter of the optical data channel using a standard target, and, as an alternative, an indirect method. This International Standard complements ISO 6487 which covers non-optical instrumentation used in impact tests on road vehicles. 2 Reference ISO 6487, Road vehicles Tec
17、hniques of measurement in impact tests Instrumentation. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 optical data channel1) system composed of an image-taking device (e.g. a camera), a recording medium for these images (film, disc, magnetic tape
18、, etc.) and a system for analysing the images, including any analysis procedure and data correction that modify the content of the data 3.2 distortion index quality parameter of the optical data channel 3.3 analysis system system to measure and collect the coordinates of target points as a function
19、of time 3.4 time-base system device allowing determination of the time interval elapsing between any two recorded events 3.5 time origin identification device device to identify the instant chosen as the time origin, usually the beginning of the impact 3.6 imaging rate frequency of renewal of inform
20、ation for a given point expressed in renewals per second or in images per second when all the points of the image are renewed simultaneously 4 Performance The performance of the optical data channel shall be evaluated initially to establish performance levels; this evaluation shall be repeated whene
21、ver the system is modified to an extent which could cause a change in accuracy. 4.1 Distortion index The distortion index shall be assessed using the photographic target and procedure described respectively in A.1.1 and A.1.2 of the Annex. It shall be evaluated as indicated in A.1.3. The distortion
22、index shall not exceed 1 %. 4.2 Time base A time base is required. It shall permit determination of the time between recorded events to an accuracy of the reciprocal of the imaging rate or 1 % of the actual time, whichever is greater. 4.3 Time origin identification device The accuracy of the device
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