Effects of mobility matrices completeness on component-based transfer path analysis methods with and without substructuring applied to aircraft-like components

Structure borne noise induced by vibrating systems is considered as a major contribution to the generated inside vehicles and can be assessed using Transfer Path Analysis (TPA) methods. Their theoretical formulation requires mobility of either system, receiving structure or assembly two components according all Degrees Freedom (DoFs). However, rotational in-plane DoFs cannot measured easily their determination may result in more complex experimental set-up an increase measurement uncertainties. The need for assessing full matrices thus deserves investigated. In this work, robustness multiple TPA methods dedicated design validation phases aircraft light equipment investigated numerically completeness considering several configurations assemblies (i.e., different active source properties, numbers contact points). Numerical models have been developed simulate with controlled vibratory behavior spatial averaged mean-square velocity on used objective indicator method’s robustness. For proper predictions accuracy, it shown that required should account terms highest amplitude depends (i) method, (ii) (iii) coupling configuration. A involving generally based entirely decoupled components. Otherwise, omission in-plan could suitable assembly.