ISO 14722 pdf download.Moped and moped-rider kinematics — Vocabulary
1 Scope
1.1 This International Standard defines terms, symbols and conventions related to moped and moped-rider motions and kinematics and to the modelling thereof. 1.2 It does not deal with methods of measurement, nor with the units used in reporting the results, nor with accuracy. 1.3 The definitions in this International Standard apply to two-wheeled mopeds as defined in ISO 3833. 1.4 This International Standard does not cover road mopeds which are controlled by a pedestrian or which are used for the carriage of goods to the exclusion of persons.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3833:1 977, Road vehicles — Types — Terms and definitions. ISO 6725:1 981 , Road vehicles — Dimensions of two-wheeled mopeds and motorcycles — Terms and definitions.
3 Steering system
3.1 Axis and angles of the steering assembly 3.1.1 steer axis z H rotational axis of the steering assembly for steering control which coincides with the axis of the steering stem and with the axis of the steering head pipe 3.1.2 steer angle d H angle of motion of the steering assembly about the steer axis (3.1 .1 ) which is zero when the front wheel plane is parallel to the moped longitudinal plane 3.1.3 wheel steer angle d W angle formed by the intersection with the road surface plane of the moped longitudinal plane and the front wheel plane 3.2 Dynamic quantities of the steering assembly 3.2.1 steering velocity δ angular velocity of the sprung part of the steering assembly about the z f -axis 3.2.2 steering velocity of the handlebars δ H angular velocity of the handlebars about the z H -axis 3.2.3 steer torque torque about the steer axis (3.1 .1 ) 3.2.4 steer force value obtained from dividing the steer torque (3.2.3) and the effective rotational radius of the steering handle NOTE The effective rotational radius of the steering handle is the distance between the steer axis (3.1 .1 ) and the centre point of the steering handlegrip projected on the plane perpendicular to the steer axis. 3.2.5 steady state steer torque torque applied to the steering handle in order to maintain the motion of the moped-rider combination in a given state NOTE When the moped-rider combination is turning, this torque is classified as positive steer torque (3.2.5.1 ), neutral steer torque (3.2.5.2) or negative steer torque (3.2.5.3). 3.2.5.1 positive steer torque steady state steer torque (3.2.5) applied in the direction equal to that in which the moped-rider combination is turning 3.2.5.2 neutral steer torque amount of steady state steer torque (3.2.5) equal to zero, required when the moped-rider combination is turning 3.2.5.3 negative steer torque steady state steer torque (3.2.5) applied in the direction opposite to that in which the moped-rider combination is turning3.2.6 steady state steer force value obtained from dividing the steady state steer torque (3.2.5) and the effective rotational radius of the steering handle 3.2.7 stiffness of the steering assembly resistance against the deformation caused by the loads applied to the steering assembly NOTE There are torsional and bending stiffnesses. 3.2.8 friction torque of the steering assembly torque about the steer axis (3.1 .1 ) required to initiate the motion of the steering assembly which does not include the friction between the tyre and the road surface 3.2.9 damping torque of the steering assembly damping torque about the steer axis (3.1 .1 ) at a certain steering velocity (3.2.1 ) which does not include the damping between the tyre and the road surface 3.2.10 moment of inertia of the steering assembly moment of inertia of the steering assembly about the steering axis (3.1 .1 ) under defined load conditions