Standards Development

Scope

This document specifies technical requirements, acceptance criteria, and a validation test for dynamic dummies to be used for vibration tests of vehicle seats in the vertical direction (z-axis). Regardless of its shape and structure, a dynamic dummy that conforms to this document is deemed suitable for the purpose.

This document is applicable to the vehicle seats considered in ISO 10326-2, ISO 7096, ISO 5007, and EN 13490. It can also be used as a reference for vibration tests of other types of vehicle seats.

Purpose

Vehicle seats play an important role in reducing the vibration transmitted to occupants. While conventional seats are widely used in transport vehicles such as cars, buses, trains, and airplanes, suspension seats are commonly adopted to cope with severe vibration environments in earth-moving machinery, agricultural wheeled tractors, and industrial trucks.

It is often required that the dynamic performance of vehicle seats be tested in the laboratory. The International Organization for Standardization and the European Committee for Standardization have published several standards defining laboratory methods for evaluating the dynamic performance of different types of vehicle seats. Such standards include ISO 10326-2 for railway vehicles, ISO 7096 for earth-moving machinery, ISO 5007 for agricultural wheeled tractors, and EN 13490 for industrial trucks. They require that the Seat Effective Amplitude Transmissibility (SEAT) factor, an important dynamic performance index of vehicle seats, be obtained experimentally using both a light and a heavy test person.

As has been recognized in the practical use of the mentioned standards, finding suitable test persons for vibration tests of vehicle seats is not always easy or convenient. The use of test persons also raises safety and ethics concerns. These issues have motivated the design and development of dynamic dummies that can replace test persons for vibration tests of vehicle seats.