Abstract
Damping Loss Factor (DLF) is an important input parameter in Statistical Energy Analysis (SEA) simulations, therefore its accurate determination via measurement is crucial from simulation accuracy point of view. This paper presents a methodology for the accurate measurement of DLF via the Half Power Bandwidth Method (HPBM) for three test cases: a) a rectangular steel plate, b) the same plate with viscoelastic bitumen sheets imposed on the middle of plate and c) the same plate with the viscoelastic bitumen sheets placed randomly. The aim of the different bitumen layer applications was to develop a methodology for representing them in Statistical Energy Analysis, since this simulation technique takes into account only the coverage of the damping layers but not their distribution over a panel. Measurement of the DLF in random locations on the plate gave the appropriate parameters for the simulation. Measurement results were then applied in SEA simulations, which showed good agreement with the experimental results in all test cases, with the maximum difference of only 2 dB.
Highlights
In NVH (Noise, Vibration, Harshness) development, one of the most important fields is the accurate determination of the Damping Loss Factor (DLF) since this serves as an input parameter for simulations
Bustamante et al [6] examined the DLFs of steel and aluminium plates as well as beams by Half Power Bandwidth Method (HPBM) and Power Injection Method (PIM)
That three different excitation points and 16 response points were used, so in total 48 frequency response function (FRF) curves were investigated. From these curves the DLF values were calculated for each frequency band
Summary
In NVH (Noise, Vibration, Harshness) development, one of the most important fields is the accurate determination of the Damping Loss Factor (DLF) since this serves as an input parameter for simulations. Mandale et al [4] and Jadhav and Desia [5] determined the damping loss factor by the Half Power Bandwidth Method (HPBM) for plate structures. Bustamante et al [6] examined the DLFs of steel and aluminium plates as well as beams by HPBM and Power Injection Method (PIM). Seçgin et al [9] determined the loss factors of different types of connections between composite plates, such as point-connected, right-angle and T shape connections. They obtained the in-situ energy loss by using numerical and experimental PIM. Seçgin et al [10] investigated these parameters for the different connection types from another aspect, such as the effect of the local mass variability, to ISSN PRINT 1392-8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
