BS-AU-50-1.2.3-1993 ISO-9948-1992.pdf
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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-1.2.3:1993 ISO 9948:1992 Tyres and wheels Part 1: Tyres Section 2: Commercial vehicle tyres Subsection 2.3 Method of measuring rolling resistance UDC 629.114.3/.5.012.55:531.45.083 Licensed Copy: London South Bank University, London South Bank University,
2、Sat Dec 09 02:07:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.2.3:1993 This British Standard, having been prepared under the direction of the Automobile Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 May 1993 BSI 12-1999 T
3、he following BSI references relate to the work on this standard: Committee reference AUE/4 Draft for comment 91/71575 DC ISBN 0 580 21747 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/-) to
4、Technical Committee AUE/4, upon which the following bodies were represented: Agricultural Engineers Association Automobile Association British Industrial Truck Association British Pressure Gauge Manufacturers Association British Rubber Manufacturers Association Bus and Coach Council Department of Tr
5、ansport Freight Transport Association Institute of Road Transport Engineers (Inc) Motor Cycle Industrys Association of Great Britain Ltd. Motor Industry Research Association National Tyre Distributors Association Retread Manufacturers Association Road Haulage Association Ltd. Society of Motor Manufa
6、cturers and Traders Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.2.3:1993 BSI 12-1999i Contents Page Committees responsibleInside fron
7、t cover National forewordii 1Scope1 2Definitions1 3Test methods1 4Test equipment1 5Test conditions2 6Test procedure2 7Data interpretation3 8Data analysis4 Annex A (normative) Test equipment tolerances6 Annex B (informative) Optional test conditions7 Annex C (informative) Measurement methods of momen
8、t of inertia for drum and tyre assembly Deceleration method7 Figure 1 Free-body diagram of tyre/drum system, assuming no bearing and windage losses3 Figure C.1 Arrangement8 Figure C.2 Spring method9 Figure C.3 Bifilar pendulum (rope) method9 Table B.17 Licensed Copy: London South Bank University, Lo
9、ndon South Bank University, Sat Dec 09 02:07:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.2.3:1993 ii BSI 12-1999 National foreword This Subsection of this Part of BS AU 50 has been prepared under the direction of the Automobile Standards Policy Committee. It is identical with ISO 9948:1
10、992 Truck and bus tyres Methods of measuring rolling resistance, published by the International Organization for Standardization (ISO). Other Parts of this standard are as follows: Part 2: Wheels and rims; Part 3: Valves; Part 4: Rim profiles and dimensions. A British Standard does not purport to in
11、clude 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 document comprises a front cover, an inside front cover, pag
12、es i and ii, pages 1 to 9 and 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. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:
13、07:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.2.3:1993 BSI 12-19991 1 Scope This International Standard specifies methods for measuring rolling resistance, under controlled laboratory conditions, for new pneumatic tyres designed primarily for use on trucks and buses. The relationship b
14、etween values obtained and the fuel economy of the vehicle is undetermined, and such values are not intended to be used to indicate levels of performance or quality. This International Standard applies to all truck and bus tyres. It enables comparisons to be made between the rolling resistance of ne
15、w tyres when they are free-rolling straight ahead, in a position perpendicular to the drum outer surface, and in steady-state conditions. In measuring tyre rolling resistance, it is necessary to measure small forces in the presence of much larger forces. It is, therefore, essential that equipment an
16、d instrumentation of appropriate accuracy be used. 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 rolling resistance, Fr loss of energy (or energy consumed) per unit of distance NOTE 1The SI unit conventionally used for the rolling resistance is t
17、he newton metre per metre (Nm/m). This is equivalent to the drag force in newtons (N). 2.2 rolling resistance coefficient, Cr ratio of the rolling resistance, in newtons, to the load on the tyre, in newtons. This quantity is dimensionless and is derived as follows: 2.3 capped inflation process of in
18、flating the tyre and allowing the inflation pressure to build up, as the tyre is warmed up while running 2.4 regulated inflation process of inflating the tyre to the required pressure independent of its temperature, and maintaining this inflation pressure while the tyre runs under load. This is most
19、 commonly done by using a regulated pressure source attached to the tyre through a rotating union. (See Annex B.) 2.5 parasitic loss loss of energy (or energy consumed) per unit distance excluding tyre losses, and attributable to aerodynamic loss, bearing friction and other sources of systematic los
20、s which may be inherent in the measurement 2.6 skim reading type of parasitic loss measurement, in which the tyre is kept rolling, without slippage, while reducing the tyre load to a level at which energy loss within the tyre itself is virtually zero 2.7 machine reading type of parasitic loss measur
21、ement, involving losses of the test machine, exclusive of losses in the rotating spindle which carries the tyre and rim 2.8 moment of inertia (see Annex C) 3 Test methods The following alternative measurement methods are given in this International Standard. The choice of an individual method is lef
22、t to the tester. For each method, the test measurements shall be converted to a rolling resistance force acting at the tyre/drum interface. a) Force method: the reaction force at the tyre spindle. b) Torque method: the torque input to the test drum. c) Power method: the power input to the test drum.
23、 d) Deceleration method: the deceleration of the test drum and tyre assembly. 4 Test equipment 4.1 Drum specifications 4.1.1 Diameter The test dynamometer shall have a cylindrical flywheel (drum) with a diameter of between 1,7 m and 3 m inclusive. It should be noted that the results are different; s
24、ee 8.3 for drum diameter correction for comparisons, if necessary. 4.1.2 Surface The surface of the drum shall be smooth steel or textured, and shall be kept clean. For the textured drum surface, see B.4. Cr rolling resistance test load - -= Licensed Copy: London South Bank University, London South
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