1、BRITISH STANDARD BS ISO 9129:2008 Motorcycles Measurement methods for moments of inertia ICS 43.140 BS ISO 9129:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008 ISBN 978 0 580 57908 0 National foreword This British S
2、tandard is the UK implementation of ISO 9129:2008. The UK participation in its preparation was entrusted to Technical Committee AUE/14, Motor cycles and mopeds. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to inc
3、lude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Date Comments Reference number ISO 9129:2008(E)INTERNATIONAL STANDARD I
4、SO 9129 Second edition 2008-05-15 Motorcycles Measurement methods for moments of inertia Motocycles Mthodes de mesure des moments dinertie BS ISO 9129:2008ii iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Measurement conditions . 2 5
5、Measuring instruments 2 6 Measuring procedure . 3 6.1 Measurement of location of centre of gravity3 6.2 Roll moment of inertia about x-axis (physical pendulum principle) . 3 6.3 Pitch moment of inertia about y-axis (physical pendulum principle) . 7 6.4 Yaw moment of inertia about z-axis (bifilar pen
6、dulum principle) 11 7 Test results 16 Annex A (normative) Format for measurement results 17 BS ISO 9129:2008iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards i
7、s 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, governmental and non-governmental, in liaison with ISO, also take par
8、t 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 Directives, Part 2. The main task of technical committees is to p
9、repare 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 bodies casting a vote. Attention is drawn to the possibility tha
10、t 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 9129 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 22, Motorcycles. This second edition cancels and replac
11、es the first edition (ISO 9129:1988), which has been technically revised. BS ISO 9129:2008 v Introduction The stability of a motorcycle is a very important element of its active safety. The motorcycle/rider combination and the environment in which this combination is used form a unique closed-loop s
12、ystem. However, the evaluation of motorcycle/rider combination stability is extremely complex because of interaction of the intrinsic motorcycle stability, the influence of the position of the rider and his response to continuously changing conditions. In the evaluation of motorcycle stability, the
13、determination of the kinetic characteristics of the motorcycle/rider combination is considered an important part of the design parameters of the vehicle itself. The test procedure described in this International Standard deals with one aspect of the kinetic characteristics: the determination of the
14、moments of inertia of the motorcycle and of the motorcycle/rider combination. BS ISO 9129:2008 blank 1 Motorcycles Measurement methods for moments of inertia 1 Scope This International Standard specifies a measuring method for determining the moments of inertia of the motorcycle and of the motorcycl
15、e/rider combination. It applies to two-wheeled motorcycles. Other measuring methods can be used if it is demonstrated that the results are equivalent. Measurement results obtained exclusively by the method described in this International Standard (see Annex A) cannot be used for an evaluation of veh
16、icle stability because they deal with only one aspect of this very complex phenomenon. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of
17、 the referenced document (including any amendments) applies. ISO 3779, Road vehicles Vehicle identification number (VIN) Content and structure ISO 9130, Motorcycles Measurement method for location of centre of gravity 49 CFR Part 572 Subpart B Code of Federal Regulations, issued by the National High
18、way Traffic Administration (NHTSA) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 motorcycle-fixed axis system (x, y, z) right-hand orthogonal axis system fixed in the motorcycle, such that when the motorcycle is moving in a straight line on
19、 a level road, the x-axis is substantially horizontal, points forwards and is in the longitudinal plane of symmetry of the motorcycle, the y-axis points to the riders left side and the z-axis points upwards NOTE 1 This coordinate system performs translation motion and rotational motion together with
20、 the motorcycle. NOTE 2 Assuming that the motorcycle is fixed to a platform, the coordinate system is also applied to the platform. 3.2 earth-fixed axis system (X, Y, Z) right-hand orthogonal axis system fixed on the Earth, such that the X-axis and the Y-axis are in a horizontal plane and the Z-axis
21、 points upwards BS ISO 9129:20082 4 Measurement conditions 4.1 Measurement conditions for a motorcycle shall be as follows: a) the motorcycle shall be quite clean and free from mud and deformation, and shall operate normally; b) the fuel shall be filled up to the top level specified in the operation
22、 manual; c) lubricating oil and cooling water, for water-cooled engines, shall be filled up to the level specified in the operation manual; d) tyre pressure shall be as specified in the operation manual; e) tools shall be provided at the regular storage positions; f) front and rear suspension system
23、s shall be fixed at a static position; g) the front wheel shall be positioned along the x-axis. If the conditions are to be modified depending on the object of measurement, the modified conditions shall be recorded in the measurement results (see Annex A). 4.2 Measurement conditions when a rider is
24、on the motorcycle shall be as follows: a) measurement conditions of the motorcycle shall be as specified in 4.1; b) a test dummy as specified in 49 CFR Part 572 Subpart B (or equivalent), with a mass of 73,4 kg, or an equivalent human being, shall be used as the rider; c) the rider shall be position
25、ed as follows: 1) positioned on the vertical centre surface of the motorcycle; 2) sitting on the seat, holding the handle bar by both hands, with both feet placed on the foot rests; 3) with an angle of posture formed by the line connecting the point S (indicating the centre of rotation of the torso
26、and the arms of the rider) and point H (indicating the centre of rotation of the torso and femoral regions of the rider) and the x-axis; 4) at a seating position that is the distance between the front axle and the point H along the x-axis. However, if the conditions are to be modified depending on t
27、he object of measurement, the modified conditions shall be recorded in the measurement results (see Annex A). 5 Measuring instruments Measuring instruments to measure the moments of inertia shall be as follows or shall have equivalent functions and accuracy: a) a precision square level that can meas
28、ure up to 0,1 mm/1 m ( 20”); b) a steel tape measure with a tolerance of 0,3 + 0,1(L 1) mm at the length of L m; c) weighing stands with enough accuracy to weigh the object up to 0,1 kg; d) a stop watch that can measure up to 0,01 s, used for measuring the oscillation time; BS ISO 9129:2008 3 e) a p
29、latform with the highest possible rigidity, and of light weight; f) a knife edge, where the roundness at the edge shall be below 1 mm in radius, and an edge angle below 90 degrees is recommended; NOTE The roundness at the edge is the form of the edge finished sharply when rounded with the load. g) w
30、eights, to incline the platform. 6 Measuring procedure 6.1 Measurement of location of centre of gravity Calculate the mass and location of centre of gravity of the platform, motorcycle, and the platform with the motorcycle placed on it, in accordance with ISO 9130. 6.2 Roll moment of inertia about x
31、-axis (physical pendulum principle) 6.2.1 Roll moment of inertia about AB-axis for empty platform Inertia moment about the AB-axis for the empty platform shall be measured in the procedure described below (see Figure 1). a) Place the knife edges A and B on the stay so that they can freely oscillate
32、around the AB-axis. b) Oscillate the platform gently around the AB-axis. It is desirable to keep total oscillating angle below 5. c) Make sure that the platform oscillates in a stable way and measure the time required for the platform to oscillate 50 times by a stop watch. Repeat this process 3 time
33、s and obtain the average value of 3 average cycle times. The result shall be the period. d) Calculate the inertia moment of the platform about the AB-axis, I xp , expressed in kgm 2 , using Equation (1): 2 xp 22 xp p p p 2 T I cym g =+ (1) where T xpis the period for the platform to oscillate around
34、 the AB-axis, in s; c pis the distance along the z-axis from the knife edge to the centre of gravity of the platform, in m; y pis the distance along the y-axis from the knife edge to the centre of gravity of the platform, in m; m pis the mass of the platform, in kg; g is acceleration due to gravity
35、(9,81 m/s 2 ). BS ISO 9129:20084 a) Side view b) Rear view Key c pdistance along the z-axis from the knife edge to the centre of gravity of the platform m pmass of platform y pdistance along the y-axis from the knife edge to the centre of gravity of the platform Figure 1 Measurement procedure for ro
36、ll moment of inertia of empty platform (procedure with physical pendulum principle) BS ISO 9129:2008 5 6.2.2 Roll moment of inertia of motorcycle about x-axis Roll moment of inertia of the motorcycle about the x-axis shall be measured in the procedure described below (see Figure 2). NOTE This measur
37、ement applies to both the empty motorcycle and the motorcycle with a rider. a) Place the motorcycle on the platform and fix it so that it cannot move. The lateral inclination angle of the motorcycle to the platform shall be 0 0,5. b) Place the knife edges A and B on the stay so that they can freely
38、oscillate around the AB-axis. c) Oscillate the motorcycle/platform combination gently around the AB-axis. It is desirable to keep total oscillating angle below 5. d) Make sure that the platform oscillates in a stable way and measure the time required for the platform to oscillate 50 times by a stop
39、watch. Repeat this process 3 times and obtain the average value of 3 average cycle times. The result shall be the period. e) Calculate the inertia moment of the motorcycle about the x-axis, I xm , expressed in kgm 2 , using Equation (2): () 2 22 22 xT xm T T T xp m m m 2 T Ic y m g I m c y =+ + (2)
40、where T xTis the period for the platform with the motorcycle on it to oscillate around the AB-axis, in s; c Tis the distance along the z-axis from the knife edge to the centre of gravity of the motorcycle/platform combination, in m; y Tis the distance along the y-axis from the knife edge to the cent
41、re of gravity of the motorcycle/platform combination, in m; m Tis the mass of motorcycle/platform combination, in kg; I xpis the inertia moment of the platform about the AB-axis, in kgm 2see Equation (1); g is acceleration due to gravity (9,81m/s 2 ); m mis the mass of motorcycle, in kg; c mis the d
42、istance along the z-axis from the knife edge to the centre of gravity of the motorcycle, in m; y mis the distance along the y-axis from the knife edge to the centre of gravity of the motorcycle, in m. BS ISO 9129:20086 a) Side view b) Rear view Key c mdistance along the z-axis from the knife edge to
43、 the centre of gravity of the motorcycle c pdistance along the z-axis from the knife edge to the centre of gravity of the platform c Tdistance along the z-axis from the knife edge to the centre of gravity of the motorcycle/platform combination m mmass of motorcycle m pmass of platform m Tmass of mot
44、orcycle/platform combination y mdistance along the y-axis from the knife edge to the centre of gravity of the motorcycle y pdistance along the y-axis from the knife edge to the centre of gravity of the platform y Tdistance along the y-axis from the knife edge to the centre of gravity of the motorcyc
45、le/platform combination Figure 2 Measurement procedure for roll moment of inertia of the motorcycle (procedure with physical pendulum principle using a platform) BS ISO 9129:2008 7 6.3 Pitch moment of inertia about y-axis (physical pendulum principle) 6.3.1 Pitch moment of inertia about CD-axis for
46、empty platform Inertia moment about the CD-axis for the empty platform shall be measured in the procedure described below (see Figure 3). a) Place the knife edges C and D on the stay so that they can freely oscillate around the CD-axis. b) Oscillate the platform gently around the CD-axis. It is desi
47、rable to keep total oscillating angle below 5. c) Make sure that the platform oscillates in a stable way and measure the time required for the platform to oscillate 50 times by a stop watch. Repeat this process 3 times and obtain the average value of 3 average cycle times. The result shall be the pe
48、riod. d) Calculate the inertia moment of the platform about the CD-axis, I yp , expressed in kgm 2 , using Equation (3): 2 yp 22 yp p p p 2 T I cxm g =+ (3) where T ypis the period for the platform to oscillate around the CD-axis, in s; c pis the distance along the z-axis from the knife edge to the
49、centre of gravity of the platform, in m; x pis the distance along the x-axis from the knife edge to the centre of gravity of the platform, in m; m pis the mass of the platform, in kg; g is acceleration due to gravity (9,81m/s 2 ). BS ISO 9129:20088 a) Side view b) Rear view Key c pdistance along the z-axis from the knife edge to the centre of gravity of the platform m pmass of platform x pdistance along t
