1、BRITISH STANDARD BS ISO 5007:2003 Agricultural wheeled tractors Operators seat Laboratory measurement of transmitted vibration ICS 13.160; 65.060.10 BS ISO 5007:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 May 2003 BSI 5 May 2003 IS
2、BN 0 580 41746 8 National foreword This British Standard reproduces verbatim ISO 5007:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery, which has the responsibility to:
3、 A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Cor
4、respondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does no
5、t of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developme
6、nts and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was l
7、ast issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 5007:2003(E)INTERNATIONAL STANDARD ISO 5007 Second edition 2003-03-15 Agricultural wheeled tractors Operators seat Laboratory measurement of transmitted vibration Tracteurs agricoles roues Sige du conducteur
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13、ents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and abbreviated terms 2 5 General. 3 5.1 Evaluation criteria . 3 5.2 Instrumentation and frequency analysis 3 5.3 Safety 3 6 Test conditions and procedure . 3 6.1 General. 3 6.2 Simulation
14、of vibration (see ISO 10326-1:1992, Clause 5). 3 6.3 Test seat. 4 6.4 Test person and posture 4 6.5 Input vibration . 5 6.6 Tolerances on input vibration (see ISO 10326-1:1992, 8.1). 6 7 Acceptance criteria . 7 7.1 SEAT factor 7 7.2 Damping performance 7 7.3 Damper adjustment. 7 8 Seat identificatio
15、n . 8 9 Test report 8 Bibliography . 14 BSISO5007:2003iv Foreword ISO (the 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 committee
16、s. Each member body interested in a subject for which a technical committee 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 Inter
17、national Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International St
18、andards adopted by the technical committees are circulated to the member bodies 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 document may be the sub
19、ject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5007 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 edi
20、tion (ISO 5007:1990), which has been technically revised. BSISO5007:2003 vIntroduction The operators of agricultural tractors are often exposed to a low frequency vibration environment, partly caused by the movement of the vehicles over uneven ground and the tasks carried out. The seat constitutes t
21、he last stage of suspension before the driver. In order for it to be efficient at attenuating the vibration, the suspension seat should be chosen in accordance with the dynamic characteristics of the vehicle. The design of the seat and its suspension is a compromise between the requirements of reduc
22、ing the effects of vibration and shock on the operator, and of providing stable support so that the operator can control the machine effectively. Thus, because seat vibration attenuation is a compromise of a number of factors, the selection of seat vibration parameters needs to be taken in context w
23、ith the other requirements for the seat. The performance criteria provided in this International Standard have been set in accordance with that which is attainable using what is at present the best design practice. They do not necessarily ensure the complete protection of the operator against the ef
24、fects of vibration and shock, and could be revised in the light of future developments and improvements in suspension design. The test inputs included in this International Standard are based on a very large number of measurements taken in situ on agricultural tractors operating on the 100 m OECD st
25、andard track defined in ISO 5008, as well as on tractors operating under severe but typical field conditions. The test methods are based on ISO 10326-1, a general method applicable to seats for different types of vehicles. BSISO5007:2003INTENRATIONAL TSANDADR IS:7005 O3002(E)1Agricultural wheeled tr
26、actors Operators seat Laboratory measurement of transmitted vibration 1 Scope This International Standard specifies, in accordance with ISO 10326-1, a laboratory method for measuring and evaluating the effectiveness of the suspension of operator seats on agricultural wheeled tractors. It also specif
27、ies acceptance criteria based on the test results, while defining the input spectral classes relating to three classes of agricultural tractor with rubber tyres, unsprung rear axles and no low-frequency cab isolation those of up to 3 600 kg (class 1), those of from 3 600 kg to 6 500 kg (class 2), an
28、d those of over 6 500 kg (class 3) each of which defines a group of machines having similar vibration characteristics. The method tests the effectiveness of the seat suspension in reducing the vertical whole-body vibration transmitted to the operator at frequencies of from 1 Hz to 20 Hz. It is not a
29、pplicable to vibration reaching the operator other than through the seat (e.g. that sensed by the operators feet on the platform or control pedals or hands on the steering wheel). NOTE The tests and criteria defined in this International Standard are intended for operator seats used in agricultural
30、tractors of conventional design. Tractors with design features such as isolated front or rear axles or both and low-frequency cab suspensions, which result in significantly different vibration characteristics, can be tested in accordance with ISO 5008 to determine a whole body vibration emission val
31、ue or using other standards developed for measuring and evaluating the effectiveness of the seat suspension on such vehicles. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For un
32、dated references, the latest edition of the referenced document (including any amendments) applies. ISO 2041, 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 8041, Human response to v
33、ibration 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 on safety aspects of tests and experiments with people Part 1: Exposure to whole-body
34、 mechanical vibration and repeated shock 3 Terms and definitions For the purposes of this document, 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 BSISO5007:20032 3.2
35、 input spectral class tractors having similar ride vibration characteristics at the seat attachment point, grouped by virtue of various mechanical characteristics 3.3 unballasted mass mass of tractor in working order with full tanks and radiators, and including, where relevant, the mass of protectiv
36、e structures, but less the mass of the operator and without removable ballast weights, special equipment or other loads 3.4 operator seat portion of the machine provided for the purpose of supporting the buttocks and back of the seated operator, including any suspension system and other mechanisms p
37、rovided (for example, for adjusting the seat position) 3.5 frequency analysis process of arriving at a quantitative description of vibration amplitude as a function of frequency 3.6 measuring period time duration in which vibration data for analysis is obtained 4 Symbols and abbreviated terms See Ta
38、ble 1. Table 1 Symbols and abbreviated terms Symbol/abbreviation Description a P (f r ) Unweighted rms value of the measured vertical acceleration at the platform under the seat (see Figure 1) measured at the resonance frequency when the seat is excited at the resonance frequency a P12 , a P34Unweig
39、hted rms value of the target vertical acceleration at the platform under the seat (see Figure 1) between frequencies f 1 and f 2 , or f 3and f 4a P12 , a P34Unweighted rms value of the measured vertical acceleration at the platform under the seat (see Figure 1) between frequencies f 1and f 2 , or f
40、3and f 4a S (f r ) Unweighted rms value of the measured vertical acceleration at the seat disc measured at the resonance frequency when the seat is excited at the resonance frequency a wP12 , a wP34Weighted rms value of the target vertical acceleration at the platform under the seat (see Figure 1) p
41、latform between frequencies f 1and f 2 , or f 3and f 4a wP12Weighted rms value of the measured vertical acceleration at the platform under the seat (see Figure 1) between frequencies f 1and f 2a wS12Weighted rms value of the measured vertical acceleration at the seat disc (see Figure 1) between freq
42、uencies f 1and f 2B eResolution bandwidth, expressed in Hertz f Frequency, expressed in Hertz f rFrequency at resonance, expressed in Hertz G P (f) Measured PSD of the vertical vibration at the platform (seat base) G P (f) Target PSD of the vertical vibration at the platform (seat base) G PL (f) Low
43、er limit for the measured PSD of the vertical vibration at the platform (seat base) BSISO5007:2003 3Table 1 (continued) Symbol/abbreviation Description G PU (f) Upper limit for the measured PSD of the vertical vibration at the platform (seat base) H(f r ) Transmissibility at the resonance frequency
44、PSD Power spectral density, expressed as acceleration squared per unit bandwidth, (m/s 2 ) 2 /Hz rms Root mean square SEAT Seat effective amplitude transmissibility F SEATSeat effective amplitude transmissibility factor (see Table 2) T sSampling time, expressed in seconds 5 General 5.1 Evaluation cr
45、iteria The laboratory simulated machine vertical vibration, specified as input spectral class, is based on representative measured data from tractors driven on a standardized test track and on data obtained from field tests under various conditions of use. The test input for a particular tractor cla
46、ss is a representative envelope for the machines within that class. Two criteria are used for the evaluation of seat vibration: a) the SEAT (seat effective amplitude transmissibility) factor in accordance with ISO 10326-1:1992, 9.1, but with frequency weighting in accordance with ISO 2631-1; b) the
47、maximum transmissibility ratio in the damping test in accordance with ISO 10326-1:1992, 9.2. 5.2 Instrumentation and frequency analysis The measuring equipment shall be in accordance with ISO 8041 (type 1 instrument) and ISO 10326-1:1992, Clause 4. The frequency weighting shall include the effects o
48、f the band limiting filters and shall be in accordance with ISO 2631-1. 5.3 Safety Safety precautions shall be in accordance with ISO 13090-1. Any compliant end-stops or devices normally fitted to production versions of the seat to be tested to minimize the effect of suspension over travel shall be
49、in place for the dynamic tests. 6 Test conditions and procedure 6.1 General The test conditions and test procedure shall be in accordance with ISO 10326-1:1992, Clauses 7 and 8. 6.2 Simulation of vibration (see ISO 10326-1:1992, Clause 5) A platform whose dimensions correspond approximately to those of the operators platform on an agricultural tractor shall be mounted on a vibrator capable of generating vibration along the vertical ax
