Overview
ISO 14722:1998 - "Moped and moped-rider kinematics - Vocabulary" is an ISO vocabulary standard that defines the terms, symbols and conventions used to describe moped motion, rider–vehicle interactions and kinematic modelling. The standard is intended for two‑wheeled mopeds (as defined in ISO 3833) and explicitly does not prescribe measurement methods, units or accuracy limits. It also excludes pedestrian‑controlled road mopeds and mopeds used solely for carriage of goods.
Key Topics
ISO 14722 organizes a consistent terminology across the main technical areas relevant to moped kinematics and modelling:
- Steering system - steer axis and angles, steering velocity, steer torque/force, stiffness, friction and damping, and steering behaviours (e.g., counter‑steering, disturbed steer).
- Suspension system - suspension geometry, wheel centre and wheel travel, fork offset, castor, link ratios, ride and suspension rates, damping characteristics.
- Tyres and wheels - tyre contact centre concepts (conventional, geometrical, effective), camber and slip angles, slip ratio, tyre forces (vertical, longitudinal, lateral), cornering, camber and plysteer/conicity forces, tyre stiffness.
- Axis systems and kinematics - axis conventions, horizontal/ground contact axes, masses and weight distribution, moments of inertia, motion variables, forces and moments.
- Directional dynamics & motion characteristics - controls, control modes, moped response, steer properties and stability.
- Aerodynamics and rider effects - wind variables, aerodynamic forces/moments and coefficients for the moped–rider combination.
- Riding postures, behaviours and tests - standard vocabulary for postures and descriptions of test environments (constant vs changeable).
Applications
ISO 14722 is a foundational reference for anyone working with moped kinematics, vehicle dynamics modelling, and safety analysis:
- Vehicle designers and suspension/steering engineers - ensure consistent use of geometry and load terms across design documents.
- Dynamics and simulation engineers - apply standardized axis conventions, motion variables and force definitions when building multibody or tyre models.
- Test laboratories and validation teams - use the vocabulary to write reproducible test specifications and reports (note: measurement methods/units are outside this standard).
- Regulators, standards committees and researchers - harmonize terminology in legislation, normative documents and academic publications.
- Suppliers and OEMs - improve technical communication about tyres, steering assemblies and suspension components.
Related Standards
- ISO 3833:1977 - road vehicle types and definitions (referenced for moped definition).
- ISO 6725:1981 - dimensions and terms for two‑wheeled mopeds and motorcycles (referenced for castor/castor angle).
Using ISO 14722:1998 helps teams avoid ambiguity in "moped kinematics", "steering geometry", "tyre forces" and related terms - enabling clearer design, modelling and safety assessments across the moped engineering ecosystem.