Browse Publications Technical Papers 2019-01-1540
2019-06-05

A comparison of two source characterisation techniques proposed for standardisation 2019-01-1540

Automotive industry shows an increased tendency towards characterisation of vibration sources by independent quantities such as blocked forces and free velocities. Currently two independent ISO working groups propose standards for this source characterisation process. Both standards are still under development. During this presentation it is shown how the different approaches of both standards can be derived from a general Transfer Path Analysis (TPA) framework and a qualitative comparison will be made. Next, a practical study involving source characterisation and a response simulation using component TPA methodology is shown to illustrate the practical differences between the approaches and their effects when used in response synthesis. In conclusion some best practice approaches and software are discussed. The practical study is done on a pre-designed benchmark of such complexity to fit in right between “real life” structures as often found in industrial applications and “academic” structures which are typically the simplest models to identify a particular phenomenon. ISO working documents references: • ISO/NWIP 21955 "Vehicles — Experimental method for transposition of dynamic forces generated by an active component from a test bench to a vehicle" (Based on French standard XP R 19-701) • ISO/CD 20270 “Acoustics — Characterization of sources of structure-borne sound and vibration — Indirect measurement of blocked forces”

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