1、BRITISH STANDARD BS ISO 9043:2008 Mopeds Measurement method for moments of inertia ICS 43.140 BS ISO 9043:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008 ISBN 978 0 580 57110 7 National foreword This British Standa
2、rd is the UK implementation of ISO 9043:2008. 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 include
3、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 9043:2008(E)INTERNATIONAL STANDARD ISO 90
4、43 Second edition 2008-02-15 Mopeds Measurement method for moments of inertia Cyclomoteurs Mthode de mesure des moments dinertie BS ISO 9043:2008 ii iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Measurement conditions . 2 5 Measuring
5、 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 pendulum pri
6、nciple) 11 7 Test results 16 Annex A (normative) Format for measurement results 17 BS ISO 9043:2008iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normall
7、y 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 part in the
8、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 prepare In
9、ternational 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 that some of
10、 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 9043 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds. This second edition cancels and replaces the first e
11、dition (ISO 9043:1991), which has been technically revised. BS ISO 9043:2008 v Introduction The stability of a moped is a very important element of its active safety. The moped/rider combination and the environment in which this combination is used form a unique closed-loop system. However, the eval
12、uation of moped/rider combination stability is extremely complex because of interaction of the intrinsic moped stability, the influence of the position of the rider and his response to continuously changing conditions. In the evaluation of moped stability, the determination of the kinetic characteri
13、stics of the moped/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 moments of inertia of the moped and of the m
14、oped/rider combination. BS ISO 9043:2008blank 1 Mopeds Measurement method for moments of inertia 1 Scope This International Standard specifies a measuring method for determining the moments of inertia of the moped and of the moped/rider combination. It applies to two-wheeled mopeds. Other measuring
15、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 vehicle stability because they deal with only one aspect of this very complex p
16、henomenon. 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 the referenced document (including any amendments) applies. ISO 3779, Road
17、vehicles Vehicle identification number (VIN) Content and structure ISO 8705, Mopeds Measurement method for location of centre of gravity 49 CFR Part 572 Subpart B Code of Federal Regulations, issued by the National Highway Traffic Administration (NHTSA) 3 Terms and definitions For the purposes of th
18、is document, the following terms and definitions apply. 3.1 moped-fixed axis system (x, y, z) right-hand orthogonal axis system fixed in the moped, such that when the moped is moving in a straight line on a level road, the x-axis is substantially horizontal, points forwards and is in the longitudina
19、l plane of symmetry of the moped, 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 the moped. NOTE 2 Assuming that the moped is fixed to a platform, the coordinate system is also appl
20、ied 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 points upwards BS ISO 9043:20082 4 Measurement conditions 4.1 Measurement conditions for a moped shall be as f
21、ollows: a) the moped 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 manual; c) lubricating oil and cooling water, for water-cooled engines, shall be filled up to the level specified in the
22、 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 systems shall be fixed at a static position; g) the front wheel shall be positioned along the x-axis. If the conditions are to
23、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 on the moped shall be as follows: a) measurement conditions of the moped shall be as specified in 4.1; b) a test dummy as
24、 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 positioned as follows: 1) positioned on the vertical centre surface of the moped; 2) sitting on the seat, holding the handle bar by both ha
25、nds, 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 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;
26、 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 the object of measurement, the modified conditions shall be recorded in the measurement results (see Annex A). 5 Measuring instruments Me
27、asuring 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 measure 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
28、 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 9043:2008 3 e) a platform 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
29、 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) weights, to incline the platform. 6 Measuring procedure 6.1 Measurement of location of centre of gravity Calculate the mass and location
30、of centre of gravity of the platform, moped, and the platform with the moped placed on it, in accordance with ISO 8705. 6.2 Roll moment of inertia about x-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 p
31、latform 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 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 tha
32、t 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 period. d) Calculate the inertia moment of the platform about the
33、 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 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 alo
34、ng 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 (9,81 m/s 2 ). BS ISO 9043:20084 a) Side view b) Rear view Key c pdistance along the z-axis from the knife edge to the centre of gravity of the pl
35、atform 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 roll moment of inertia of empty platform (procedure with physical pendulum principle) BS ISO 9043:2008 5 6.2.2 Roll moment of inertia of moped about
36、 x-axis Roll moment of inertia of the moped about the x-axis shall be measured in the procedure described below (see Figure 2). NOTE This measurement applies to both the empty moped and the moped with a rider. a) Place the moped on the platform and fix it so that it cannot move. The lateral inclinat
37、ion angle of the moped to the platform shall be 0 0,5. b) Place the knife edges A and B on the stay so that they can freely oscillate around the AB-axis. c) Oscillate the moped/platform combination gently around the AB-axis. It is desirable to keep total oscillating angle below 5. d) Make sure that
38、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 period. e) Calculate the inertia moment of the moped about the x-ax
39、is, 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) where T xTis the period for the platform with the moped 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 t
40、he moped/platform combination, in m; y Tis the distance along the y-axis from the knife edge to the centre of gravity of the moped/platform combination, in m; m Tis the mass of moped/platform combination, in kg; I xpis the inertia moment of the platform about the AB-axis, in kgm 2see Equation (1); g
41、 is acceleration due to gravity (9,81 m/s 2 ); m mis the mass of moped, in kg; c mis the distance along the z-axis from the knife edge to the centre of gravity of the moped, in m; y mis the distance along the y-axis from the knife edge to the centre of gravity of the moped, in m. BS ISO 9043:20086 a
42、) Side view b) Rear view Key c mdistance along the z-axis from the knife edge to the centre of gravity of the moped 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 moped/platfor
43、m combination m mmass of moped m pmass of platform m Tmass of moped/platform combination y mdistance along the y-axis from the knife edge to the centre of gravity of the moped 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
44、the knife edge to the centre of gravity of the moped/platform combination Figure 2 Measurement procedure for roll moment of inertia of the moped (procedure with physical pendulum principle using a platform) BS ISO 9043:2008 7 6.3 Pitch moment of inertia about y-axis (physical pendulum principle) 6.3
45、.1 Pitch moment of inertia about CD-axis for 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 p
46、latform gently around the CD-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 times and obtain the average value of 3 av
47、erage cycle times. The result shall be the period. 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
48、 along the z-axis from the knife edge to the 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 (9,81 m/s 2 ). BS ISO 9043:20088 a) Si
49、de 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 the x-axis from the knife edge to the centre of gravity of the platform Figure 3 Measurement procedure for pitch moment of inertia of empty platform (procedure with physical pendulum principle) BS ISO 9043:2008
