Contribution
On identifying boundary conditions of a beam
* Presenting author
Abstract:
Measures to help reduce structure-borne and radiated airborne noise can be developed more efficiently by firstly identifying the resonance frequencies and corresponding mode shapes. Both the resonance frequencies and mode shapes are very dependent on the material properties of the structure. However, at low frequencies, the boundary conditions of the structure become more influential. In other words, changing the boundary conditions of a beam at low frequencies can have significant effects on the resonance frequencies. Therefore, accurately knowing the real, non-idealized boundary conditions is essential for effective noise control, especially when using numerical prediction methods to analyze the vibration response. In this paper, a semi-empirical approach will be presented on how to identify the boundary conditions of a beam through measurements of the transfer mobility. The limitations and results of this semi-empirical approach will be demonstrated on a simulated beam as well as an actual beam with mocked-up ideal boundary conditions.