- Standard 1: 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)
Main Goal: To help suppliers design suitable test setups. (Obviously: evaluate performance in target setup.)
- Standard 2: ISO/CD 20270
“Acoustics — Characterization of sources of structure-borne sound and vibration — Indirect measurement of blocked forces”
Main Goal: To target setting for component specifications. (Obviously: evaluate performance in target setup.
Both standards contain valuable practical additions to the theory. The first (ISO/NWIP 21955) provides extensive guidelines for compliant interfaces and testing. The second standard (ISO/CD 20270) offers artificial excitation and on-board validation steps.
In this paper it is shown how the different approaches can be derived and compared using the general framework for Transfer Path Analysis (TPA). It is shown how one standard clearly relates to classical TPA methods (using interface forces), while the other standard adheres the component-based TPA principles (using Blocked Forces). Practical guidelines found in the standard proposals are reviewed, allowing for a qualitative comparison of the proposed procedures.