ISO 9043:2008 PDF

Mopeds — Measurement method for moments of inertia

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Title (English):

ISO 9043:2008

Mopeds — Measurement method for moments of inertia

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 17
Publication date:: February 21, 2008
Edition:: ISO IS 9043 edition 2 version 1
ICS:: 43.140

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Description (English):

ISO 9043:2008 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 methods can be used if it is demonstrated that the results are equivalent. Measurement results obtained exclusively by the method described in ISO 9043:2008 cannot be used for an evaluation of vehicle stability because they deal with only one aspect of this very complex phenomenon.

Technical details

Technical committee: ISO/TC 22/SC 38 - Motorcycles and mopeds
SKU: ISO 9043:2008

Abstract

Overview

ISO 9043:2008 - "Mopeds - Measurement method for moments of inertia" defines a standardized laboratory method to determine the moments of inertia of two-wheeled mopeds and moped/rider combinations. The standard describes measurement conditions, required instruments, and step-by-step procedures to obtain roll, pitch and yaw moments of inertia using pendulum methods. It is intended for engineers, test laboratories and manufacturers who need repeatable inertia data for dynamic modelling, design and validation. Note: results from ISO 9043:2008 alone do not constitute a full vehicle-stability evaluation.

Key topics and technical requirements

Scope and limitations
- Applies to two-wheeled mopeds and moped/rider combinations.
- Other methods are acceptable if equivalence can be demonstrated.
- Measurement output addresses only one aspect of vehicle stability.
Measurement conditions
- Moped prepared per manual (fuel, lubricants, tyre pressure), clean and undamaged.
- Suspension fixed; front wheel aligned with the longitudinal axis.
- Rider simulated by a 73.4 kg test dummy (49 CFR Part 572 Subpart B) or equivalent human per protocol.
Instruments and accuracy
- Precision square level, steel tape, weighing stands (0.1 kg accuracy), stopwatch (0.01 s), rigid lightweight platform, knife edges and balancing weights.
Measurement procedures
- Centre of gravity located according to ISO 8705 before inertia tests.
- Roll and pitch moments: measured by the physical-pendulum (platform + moped) method - small-angle oscillations recorded and converted to inertia values from oscillation period and geometry.
- Yaw moment: measured by the bifilar-pendulum principle.
- Multiple runs recommended (e.g., averaging repeated 50-cycle timings) and strict alignment/angle limits (oscillation

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Scope and limitations
- Applies to two-wheeled mopeds and moped/rider combinations.
- Other methods are acceptable if equivalence can be demonstrated.
- Measurement output addresses only one aspect of vehicle stability.
Measurement conditions
- Moped prepared per manual (fuel, lubricants, tyre pressure), clean and undamaged.
- Suspension fixed; front wheel aligned with the longitudinal axis.
- Rider simulated by a 73.4 kg test dummy (49 CFR Part 572 Subpart B) or equivalent human per protocol.
Instruments and accuracy
- Precision square level, steel tape, weighing stands (0.1 kg accuracy), stopwatch (0.01 s), rigid lightweight platform, knife edges and balancing weights.
Measurement procedures
- Centre of gravity located according to ISO 8705 before inertia tests.
- Roll and pitch moments: measured by the physical-pendulum (platform + moped) method - small-angle oscillations recorded and converted to inertia values from oscillation period and geometry.
- Yaw moment: measured by the bifilar-pendulum principle.
- Multiple runs recommended (e.g., averaging repeated 50-cycle timings) and strict alignment/angle limits (oscillation

ISO 9043:2008 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

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