1、BRITISH STANDARD BS ISO 5008:2002Agricultural wheeled tractors and field machinery Measurement of whole-body vibration of the operatorICS 13.160; 65.060.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g5
2、5g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating corrigendum November 2005National forewordThis British Standard is the UK implementation of ISO 5008:2002, incorporating corrigendum November 2005. It supersedes BS 6055:1981 which is withdrawn.The UK participation in its preparati
3、on was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery.A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsibl
4、e for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 5008:2002This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards P
5、olicy and Strategy Committee on 14 August 2002 BSI 2010Amendments/corrigenda issued since publicationDate Comments 31 August 2010 Implementation of ISO corrigendum November 2005; Tables 1 and 2 corrected (key added)ISBN 978 0 580 69912 2Reference numberISO 5008:2002(E)INTERNATIONAL STANDARD ISO5008S
6、econd edition2002-07-01Agricultural wheeled tractors and field machinery Measurement of whole-body vibration of the operator Tracteurs et matriels agricoles roues Mesurage des vibrations globales du corps du conducteur BS ISO 5008:2002iiISO 5008:2002 (E)IS:8005 O2002(E) I SO 2002 All irthgs ersedevr
7、 iiiContents Page Foreword.iv Introduction.v 1 Scope 1 2 Normative references1 3 Terms and definitions .2 4 Symbols2 5 Vibration measurements.2 6 Instrumentation3 7 Safety recommendations4 8 Operator5 9 Operator seat .5 10 Condition of tractor .5 11 Measurement sites and operating conditions 6 12 Te
8、st report 6 Annex A (informative) Field measurements .14 Annex B (informative) Specimen report of measurement of whole body vibration of the operator of an agricultural tractor or field machine 16 BS ISO 5008:2002iiiISO 5008:2002 (E)IS:8005 O2002(E) vi I SO 2002 All irthgs ersedevrForeword ISO (the
9、International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee
10、 has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnic
11、al standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bo
12、dies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for
13、identifying any or all such patent rights. ISO 5008 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 2, Common tests. This second edition cancels and replaces the first edition (ISO 5008:1979), which has been technically revised. Ann
14、exes A and B of this International Standard are for information only. BS ISO 5008:2002ivISO 5008:2002 (E)IS:8005 O2002(E) I SO 2002 All irthgs ersedevr vIntroduction The purpose of this International Standard is to define the specification of instruments, measurement procedures, measurement site cha
15、racteristics and frequency weighting that will allow the whole body vibration of agricultural wheeled tractors and field machinery to be made and reported with acceptable precision. The vibration is evaluated in accordance with currently accepted standards including means of weighting the vibration
16、levels at different frequencies to take account of the frequency sensitivity of the human operator to whole body vibration. BS ISO 5008:2002vISO 5008:2002 (E)INTENRATIONAL TSANDADR IS:8005 O2002(E)I SO 2002 All irthgs ersedevr 1Agricultural wheeled tractors and field machinery Measurement of whole-b
17、ody vibration of the operator 1 Scope 1.1 This International Standard specifies methods for measuring and reporting the whole body vibration to which the operator of an agricultural wheeled tractor or other field machine is exposed when operating on a standard test track. 1.2 The operating condition
18、s of the machine and the ordinates of the artificial test tracks are also included. 1.3. This International Standard applies when measurements are made on the artificial test tracks defined herein. 1.4. Measurements made under field conditions are covered in annex A. 1.5. This International Standard
19、 does not include assessment of vibration reaching the operator other than through his/her seat or foot platform (e.g., vibration that is sensed by the feet through the controls or by the hands through the steering wheel is not considered). 2 Normative references The following normative documents co
20、ntain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to
21、 investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2041:1990,
22、 Vibration and shock Vocabulary ISO 2631-1:1997, Mechanical vibration and shock Evaluation of human exposure to whole-body vibration Part 1: General requirements ISO 5007:1), Agricultural wheeled tractors Operators seat Laboratory measurement of transmitted vibration ISO 5348:1998, Mechanical vibrat
23、ion and shock Mechanical mounting of accelerometers ISO 8041:1990, Human response to vibration Measuring instrumentation ISO 10326-1:1992, Mechanical vibration Laboratory method for evaluating vehicle seat vibration Part 1: Basic requirements ISO 13090-1:1998, Mechanical vibration and shock Guidance
24、 on safety aspects of tests and experiments with people Part 1: Exposure to whole-body mechanical vibration and repeated shock 1) To be published. (Revision of ISO 5007:1990) BS ISO 5008:20021ISO 5008:2002 (E)IS:8005 O2002(E) 2 I SO 2002 All irthgs ersedevr3 Terms and definitions For the purposes of
25、 this International Standard, the terms and definitions given in ISO 2041 and the following apply. 3.1 whole-body vibration vibration transmitted to the body as a whole through the buttocks of a seated operator 3.2 operator seat that portion of the machine provided for the purpose of supporting the
26、buttocks and back of the seated operator, including any suspension system and other mechanisms provided (e.g., for adjusting the seat position) 3.3 frequency analysis process of arriving at a quantitative description of vibration amplitude as a function of frequency 3.4 measuring period time duratio
27、n in which vibration data for analysis is obtained 4 Symbols awi(t) frequency weighted acceleration in the direction i (i = x, y or z) awxrms value of the frequency weighted acceleration in the x direction awyrms value of the frequency weighted acceleration in the y direction awzrms value of the fre
28、quency weighted acceleration in the z direction Beresolution bandwidth of the frequency analysis, in hertz D distance from start, in metres (see clause 11) L ordinate of left-hand strip, in millimetres (see clause 11) rms root-mean-square R ordinate of right-hand strip, in millimetres (see clause 11
29、) Tssampling time, in seconds 5 Vibration measurements 5.1 Location of the measurements The vibration shall be measured along three mutually perpendicular axes, defined as follows: x-direction: back to chest y-direction: right side to left side z-direction: foot (or buttocks) to head BS ISO 5008:200
30、22ISO 5008:2002 (E)IS:8005 O2002(E) I SO 2002 All irthgs ersedevr 3The vibration shall be determined as close as possible to the point or area through which the vibration is transmitted to the body. a) In the case where the operator is normally sitting, transducers mounted in a semirigid disc shall
31、be placed on the surface of the seat such that the transducers are located midway between the ischial tuberosities of the seated person. It is acceptable if the centre of the disc is located slightly in front (up to 5 cm) of the ischial turberosities or the vertical projection of the Seat Index Poin
32、t (SIP). b) In the case where the operator is normally standing, the transducers shall be located on the platform midway between the arches of the feet. 5.2 Magnitude of vibration The quantity used to describe the magnitude of vibration shall be the frequency-weighted acceleration in meters per seco
33、nd squared (m/s2), expressed as a root-mean-square (rms) value. The frequency weightings to be used are defined in 6.3. The rms value awiused in this International Standard is defined as the rms value of the frequency weighted acceleration signal awi(t) i = x,y or z: 1/ 22ww1()dTii0aatT=For tests on
34、 a standard track, the integration time shall be the time required to traverse the track. 6 Instrumentation 6.1 General Measuring equipment may comprise: a) transducers (usually accelerometers); b) conditioning amplifiers and filters; c) telemetry set; d) recorders (digital or analog); e) meters. Th
35、e dynamic range, sensitivity, accuracy, linearity and overload capacity of the vibration measuring system shall be in accordance with ISO 8041:1990 for type 1 instruments. 6.2 Transducers Accelerometers shall normally be used for measurement of vibration. The mounting of accelerometers shall be in a
36、ccordance with ISO 5348 and the transducer manufacturers instructions. Transducers oriented in different directions at a single measurement location shall be as close together as possible. Care should be taken to ensure, as far as is practical, that neither the mass of the measuring device and its f
37、ixture, nor any local resonances, significantly affect the measured value. BS ISO 5008:20023ISO 5008:2002 (E)IS:8005 O2002(E) 4 I SO 2002 All irthgs ersedevrThe transducers used for the measurement in the seat shall be mounted in a semirigid disc (see Figure 1). The disc shall be 12 mm or less in th
38、ickness and be made of approximately 80-90 Shore-A molded rubber or plastic material. NOTE For practical reasons it is usually not possible to perfectly align the accelerometers in the disc with the directions of the basicentric coordinate system. In a tolerance range to within 15 of the appropriate
39、 directions, the accelerometers may be considered as aligned parallel to these directions. The transducers used for the measurement at the feet of a standing operator shall be rigidly fixed (e.g. by screwing or glueing) on to the working platform. If the working platform is covered by a resilient ma
40、terial, the transducers may be mounted in the middle of a rigid metal plate (about 30 cm 40 cm) with the operator standing on the plate. Dimensions in millimetres Key 1 Cavity appropriate for accelerometers 2 Thin metal disc for accelerometer mount and added centre rigidity Figure 1 Design for semir
41、igid disc for seat accelerometers (see ISO 10326-1) 6.3 Frequency weighting The frequency weightings to be used shall correspond to frequency weightings Wd(for the x and y directions) and Wk(for the z direction) in accordance with ISO 2631-1:1997 for whole body vibration. 6.4 Calibration The whole m
42、easurement chain shall be checked both before and after a sequence of measurements by using a calibration source that produces a known acceleration at a known frequency. NOTE It is also important to regularly check that the whole chain is also calibrated at other frequencies throughout the frequency
43、 range of interest. In addition to regular preventive calibration (e.g. every two years), calibration is also necessary after rough handling of any important part of the measurement chain. The results of the calibration check shall be recorded. 7 Safety recommendations Safety precautions shall be in
44、 accordance with ISO 13090-1. BS ISO 5008:20024ISO 5008:2002 (E)IS:8005 O2002(E) I SO 2002 All irthgs ersedevr 58 Operator If the tractor fits one of the 3 tractor classes that are defined in ISO 5007 and is equipped with a seat for which the SEAT factor has been established for that class, the test
45、 can be made with one operator weighing 75 kg 5 kg. If the tractor does not fit one of the 3 tractor classes that are defined in ISO 5007 and/or the SEAT factor for the seat has not been established, the test shall be made with both a light and a heavy operator. The light person shall have a total m
46、ass of 52 kg to 55 kg, of which not more than 5 kg may be carried in a belt around the waist. The heavy person shall have a total mass of 98 kg to 103 kg, of which not more than 8 kg may be carried in a belt around the waist. 9 Operator seat 9.1 General The operator seat for the test shall be repres
47、entative of series-produced models, with regard to construction, static and vibration characteristics and other features that may affect the vibration test result. Any compliant end-stops or devices normally fitted to production versions of the seat to be tested to minimize the effect of suspension
48、over-travel shall be in place for the tests. 9.2 Run-in Before the test, the suspension seats shall be run-in for a minimum of 1 h of operation under typical working conditions. 9.3 Seat adjustment The seat shall be adjusted to the weight of the test person in accordance with the manufacturers instr
49、uctions. For seats with adjustable damping, the damper shall be set according to the manufacturers instructions. For seats with fore-aft and/or lateral isolation, such isolation shall be working. The other seat adjustments shall be made to suit the operator. 10 Condition of tractor The tractor may be with or without a safety frame or cab, however, a ROPS structure and the use of a seat belt are highly recommended. For normal measurements, the tractor shall be in working order with full fuel tank and radiator, but w
