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ERP (Equivalent Radiated Power) is a well-known criterion to evaluate the structure-borne noise.
The formulation is as follows.
ERP (Equivalent Radiated Power) uses the normal velocity of each element, it can be calculated using MFBD result without complicated coupled vibro-acoustic simulation. Of course, the coupled simulation between air and structure can give more accurate result, and it requires very complicated modeling and a lot of computational cost.
In
RecurDyn/Acoustics
, by using ERP, users can predict the structure-borne noise and where it mainly comes from.(In general, minimizing ERP reduces the noise and vibration of the structure.)
The advantages of ERP
- Much less computational cost compared to the coupled vibro-acoustic simulation
- No air (Fluid) modeling is required
- Especially useful for the structure-borne sound which is caused by vibration of the structure
- Suitable for the acoustic performance optimization using geometry modification in many cases
It is recommended to use RecurDyn/Acoustics to evaluate the NVH of the flexible multi-body system.
(Applicable to FFlex and RFlex model)
Reference)
1. Comparison of Vibro-acoustic Performance Metrics in the Design and Optimization of Stiffened Composite Fuselages
Author2: Serhat, Gökhan
Inter.noise 2016
2. FE based measures for structure borne sound radiation
Authors: Matthias KLAERNER, Steffen MARBURG, Lothar KROLL
Inter.noise 2014
