ISO 9129:2008

Name: ISO 9129:2008 — Motorcycles — Measurement methods for moments of inertia
SKU: ISO 9129:2008
Price: 25 EUR
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Motorcycles — Measurement methods for moments of inertia

Название (английский):

ISO 9129:2008

Motorcycles — Measurement methods for moments of inertia

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 7 мая 2008 г.
Издание:: ISO IS 9129 edition 2 version 1
ICS:: 43.140

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Описание (английский):

ISO 9129:2008 specifies a measuring method for determining the moments of inertia of the motorcycle and of the motorcycle/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 ISO 9129:2008 cannot be used for an evaluation of vehicle stability because they deal with only one aspect of this very complex phenomenon.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 9129:2008 - "Motorcycles - Measurement methods for moments of inertia" specifies standardized test procedures to determine the moments of inertia of two‑wheeled motorcycles and motorcycle/rider combinations. The standard defines measurement conditions, required instruments, and step‑by‑step procedures (physical pendulum and bifilar pendulum principles) to obtain roll, pitch and yaw moments of inertia and the centre of gravity. ISO 9129:2008 supplements vehicle dynamics data used in design, simulation and research, but does not by itself provide a full evaluation of vehicle stability.

Key topics and technical requirements

Scope: Applies to two‑wheeled motorcycles and motorcycle/rider combinations. Other methods are acceptable if equivalence is demonstrated.

Measured quantities: Moments of inertia about the motorcycle‑fixed axes (x: roll, y: pitch, z: yaw) and location of the centre of gravity (CoG).

Measurement principles:

Physical pendulum for roll (x‑axis) and pitch (y‑axis) using a rigid platform and knife edges.
Bifilar pendulum for yaw (z‑axis).

Measurement conditions: Clean motorcycle; fuel, oil and coolant at manual‑specified levels; correct tyre pressures; tools in normal storage; suspension fixed in static position; front wheel aligned with x‑axis. Rider tests use a test dummy per 49 CFR Part 572 Subpart B (or equivalent) with mass 73.4 kg or an equivalent human positioned to specified seat/hand/foot posture.

Required instruments include a precision square level (≈0.1 mm/m), steel tape, accurate weighing stands, stopwatch (0.01 s), a light but rigid platform, knife edges with small edge radius (<1 mm), and calibration weights.

Procedure and accuracy: Oscillation periods are measured (typically multiple repeats, e.g., 50 cycles repeated three times) and used with provided formulae to compute inertia values. Annex A provides the required format for reporting results.

Limitation: Results reflect only kinetic characteristics; they are not sufficient alone for stability evaluation.

Applications and who uses it

Motorcycle manufacturers and OEM test departments for vehicle design and tuning.

Vehicle dynamics and simulation engineers integrating accurate inertia data into handling models.

Independent test laboratories and research institutions performing comparative or certification testing.

Safety researchers studying motorcycle/rider interaction and kinetic parameters.

Related standards and references

ISO 9130 (measurement method for location of centre of gravity) - used within ISO 9129 procedures.

49 CFR Part 572 Subpart B - specifies the test dummy referenced for rider‑on tests.

Note: Other test methods may be used if demonstrated as equivalent to ISO 9129:2008.

Keywords: ISO 9129:2008, motorcycles moments of inertia, motorcycle testing, roll pitch yaw inertia, motorcycle CoG measurement, physical pendulum, bifilar pendulum.

ISO 9129:2008

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards and references

Технические детали

ISO 9130:2005

Motorcycles — Measurement method for location of centre of gravity

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