1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 16754:2008Earth-moving machinery Determination of average ground contact pressure for crawler machinesBS ISO 16754:2008 BRITISH STANDARDNational forewordThis British Stand
2、ard is the UK implementation of ISO 16754:2008. The UK participation in its preparation was entrusted to TechnicalCommittee B/513/1, Earth moving machinery (International). A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pur
3、port to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 54519 1 ICS 53.100 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the St
4、andards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 16754:2008Reference numberISO 16754:2008(E)ISO 2008INTERNATIONAL STANDARD ISO16754First edition2008-06-15Earth-moving machinery Determination of average ground contact pressur
5、e for crawler machines Engins de terrassement Dtermination de la pression moyenne de contact au sol des engins chenilles BS ISO 16754:2008ISO 16754:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but
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10、9 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 16754:2008ISO 16754:2008(E) ISO 2008 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO mem
11、ber 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 has been established has the right to be represented on that committee. International organizations, governmen
12、tal 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 electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Direc
13、tives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards 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 bodi
14、es casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16754 was prepared by Technical Committee ISO/TC 127, Earth-moving machinery,
15、Subcommittee SC 1, Test methods relating to machine performance. BS ISO 16754:2008BS ISO 16754:2008INTERNATIONAL STANDARD ISO 16754:2008(E) ISO 2008 All rights reserved 1Earth-moving machinery Determination of average ground contact pressure for crawler machines 1 Scope This International Standard s
16、pecifies a uniform method for calculating the average ground contact pressure of self-propelled and towed crawler (track-laying) earth-moving machines, as defined in ISO 6165, on soft surfaces with empty equipment or attachment. The average ground contact pressure value is used only for comparing di
17、fferent machine models. Actual ground contact pressure values under operating conditions will vary depending on load, position of the centre of gravity, terrain, track shoe type and size, and surface conditions. NOTE 1 Alternative methods for determining ground contact pressure could apply to some s
18、pecific machine families. NOTE 2 The calculation makes allowance for some penetration into the supporting soil surface and the resulting increase in support area. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o
19、nly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6165:2006, Earth-moving machinery Basic types Identification and terms and definitions ISO 6746-1:2003, Earth-moving machinery Definitions of dimensions and co
20、des Part 1: Base machine 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 6746-1 and the following apply. 3.1 operating mass OM mass of the base machine, with equipment and empty attachment in the most usual configuration as specified by the manufactu
21、rer, and with the operator (75 kg), full fuel tank and all fluid systems (i.e. hydraulic oil, transmission oil, engine oil, engine coolant) at the levels specified by the manufacturer and, when applicable, with sprinkler water tank(s) half-full NOTE 1 The mass of an operator is not included for non-
22、riding machines. NOTE 2 Ballast mass included at delivery can be included if specified by the manufacturer. NOTE 3 The operating mass is expressed in kilograms. ISO 6016 BS ISO 16754:2008ISO 16754:2008(E) 2 ISO 2008 All rights reserved3.2 overall crawler length L6 distance on X coordinate between tw
23、o X planes passing through the farthest points on the ground-supported portion of the track undercarriage See Figure 1. NOTE 1 It is expressed in millimetres. NOTE 2 L6 can also be determined according to 4.3. Figure 1 Overall crawler length 3.3 crawler base L2 distance on X coordinate between two X
24、 planes passing through the front idler axis and the sprocket (or rear idler) axis ISO 6746-1 See Figure 2. NOTE It is expressed in millimetres. Figure 2 Crawler base BS ISO 16754:2008ISO 16754:2008(E) ISO 2008 All rights reserved 33.4 track shoe width W4 distance on Y coordinate between two Y plane
25、s passing through the extreme lateral points of the same track shoe ISO 6746-1 See Figure 3. NOTE It is expressed in millimetres. Figure 3 Track shoe width 4 Requirements 4.1 General The machine shall be the standard configuration as specified by the manufacturer. 4.2 Calculation of average ground c
26、ontact pressure, PgDetermine the average ground contact pressure, Pg, in kilopascals, using Equation (1): g42 6 21 000 9,8070,35( )mPnW L L L=+ (1) where m is the operating mass; n is the number of tracks; L2is the crawler base; L6is the overall crawler length; W4is the track shoe width. BS ISO 1675
27、4:2008ISO 16754:2008(E) 4 ISO 2008 All rights reservedNOTE 1 Equation (1) provides allowance for some track penetration into the supporting soil surface and the resulting increase in support area. NOTE 2 In the Equation (1), symbols with subscripts have been used to represent the dimensions in order
28、 to avoid confusion between codes (e.g. L6) and values. 4.3 Determination of L6 L6 can also be determined using Equation (2), which can be used for all types of crawler configurations, including that shown in Figure 4, provided that the angle, , is greater than or equal to 10. 622L Ld=+ (2) where d
29、is the distance on the Z coordinate between the ground reference plane and the Z plane (see ISO 6746-1) passing through the front and rear roller axis, as shown in Figure 4; L2is the crawler base; L6is the overall crawler length. NOTE In the equation, symbols with subscripts have been used to repres
30、ent the dimensions in order to avoid confusion between (e.g. L6) codes and values. Angle shall be W 10. Figure 4 Distance and angle used in determining L6 BS ISO 16754:2008ISO 16754:2008(E) ISO 2008 All rights reserved 5Bibliography 1 ISO 6016, Earth-moving machinery Methods of measuring the masses
31、of whole machines, their equipment and components 2 SAE J1309:2003, Travel Performance and Rating Procedure, Crawler Mounted Hydraulic Excavators, Material Handlers, Knuckle Boom Log Loaders, and Certain Forestry Equipment BS ISO 16754:2008ISO 16754:2008(E) ICS 53.100 Price based on 5 pages ISO 2008
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