Corrected Statistical Energy Analysis Model for Car Interior Noise

Abstract

Statistical energy analysis (SEA) is a well-known method to analyze the flow of acoustic and vibration energy in a complex structure. For an acoustic space where significant absorptive materials are present, direct field component from the sound source dominates the total sound field rather than a reverberant field, where the latter becomes the basis in constructing the conventional SEA model. Such environment can be found in a car interior and thus a corrected SEA model is proposed here to counter this situation. The model is developed by eliminating the direct field component from the total sound field and only the power after the first reflection is considered. A test car cabin was divided into two subsystems and by using a loudspeaker as a sound source, the power injection method in SEA was employed to obtain the corrected coupling loss factor and the damping loss factor from the corrected SEA model. These parameters were then used to predict the sound pressure level in the interior cabin using the injected input power from the engine. The results show satisfactory agreement with the directly measured SPL.

Review of Hybrid Finite Element – Statistical Energy Analysis methods in vehicle NVH predictions

“…Putra et al [23] worked out an individual method in 2014 to ensure the diffuse field for the SEA in a vehicle interior. They proposed the total energy to be equal to the direct field and reverberant field energies and removed the direct field component from the measurement and modified the DLFs and CLFs values.…”

“…Figure 6. The direct field removing process [23] They divided the vehicle interior into two subsystems, front and rear cabin. The front seats were the coupling between the cavities.…”

“…RPMs [23] With the advent of electric drive systems, the development of electric motors become important from fatigue and vibration point of view. Some papers investigated the problem with SEA only.…”

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

“…SEA is also applied for similar intention on ship [Pang et al, 2014] and trains [Forssen et al, 2012;Zhao et al, 2013]. Interest in improving the methodology of SEA is still ongoing; evident from recent literature [Putra et al, 2015]. On the other hand, others attempted a different approach in improving SEA by combining it with FEM to achieve higher prediction accuracy in the lower frequency range [Blanchet and Caillet, 2014;Lalor and Priebsch, 2007;Zhao et al, 2013].…”

Corrected Statistical Energy Analysis Model in a Non-Reverberant Acoustic Space

“…The modelling technique is proposed by removing the direct field component from the total measured sound energy. This method has been applied in a reverberant space of a car cabin as in Putra et al [18]. However in this paper, the model is again explained in details and experiment was conducted in a more controlled acoustic space in laboratory.…”