Use of a Hybrid FE-SEA Model of a Trimmed Vehicle to Improve the Design for Interior Noise

Charpentier, Arnaud; Sreedhar, P N; Gardner, Bryce; Fukui, Kazuki

doi:10.4271/2009-01-2199

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Finally, the majority of the sound package is modeled using a traditional SEA representation and common to that of similar airborne SEA models [8]. The treatment lay-ups can be applied to SEA subsystems.…”

Section: Modeling Processmentioning

confidence: 99%

“…2. Note that the partitioning of acoustic subsystems follows traditional airborne SEA models [8]. Additional paths from airborne SEA models (non-resonant transmission and leakage, passthroughs, seals, etc) were also included in the hybrid model.…”

Section: Full Vehicle Hybrid Fe-sea Modelmentioning

confidence: 99%

“…An additional objective of the project is the development of a simple, fast and accurate model building process using the Hybrid FE-SEA method. Other papers have described previous steps of the project, including the modeling process used for the Body-in-White (BIW) car [7] and some preliminary numerical and experimental validation results [8]. This paper summarizes the modeling process and describes the full vehicle Hybrid FE-SEA model.…”

Section: Introductionmentioning

confidence: 99%

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Mid Frequency Structure-Borne Noise Modeling in a Trimmed Automotive Vehicle

Prasanth,

Nanjundaradhya,

Sharma

2023

joast

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Finite Element Method (FEM) and the Statistical Energy Analysis (SEA) are standard methods in the automotive industry for the prediction of vibrational and acoustical response of vehicles. The FE method, based on a deterministic description of the dynamics is typically used for structure-borne and air-borne problems and is usually limited to below 250 Hz. The method becomes prohibitively expensive in terms of computational costs with increasing frequency as more Degrees-of-Freedom (DOF) are required to correctly represent the dynamic response of the structure. Additionally, the dynamic response becomes sensitive to small perturbations in the model, thus defeating the purpose of a deterministic modeling method. SEA is a statistical method widely applied in automotive industry for air-borne problems at frequencies higher than 300 Hz. The method is highly efficient for the design and optimization of sound packages facing airborne sources, but it lacks accuracy when dealing with structure-borne sources in the mid frequency range. However, both methods are not capable of handling the so called "mid frequency problem", where both short and long wavelength components are present in the same system. A Hybrid method has been recently proposed that rigorously couples SEA and FEM. In this work, the HybridFE-SEA method has been used to create fast/efficient model of structure-borne noise in a fully trimmed vehicle from 200Hz to 1 kHz. This paper first describes simple guidelines used to partition the vehicle into stiff components described with FE and modally dense components described with SEA. It is also demonstrated how detailed local FE models can be used to improve SEA descriptions of car panels and couplings. After review of the Hybrid FE-SEA models of a full vehicle that were built, sample experimental validation results of interior Sound Pressure Levels and panel vibration are shown for both bare and fully trimmed vehicle configurations.

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Section: Modeling Processmentioning

confidence: 99%

Section: Full Vehicle Hybrid Fe-sea Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mid Frequency Structure-Borne Noise Modeling in a Trimmed Automotive Vehicle

Prasanth,

Nanjundaradhya,

Sharma

2023

joast

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“…Then, a hybrid model of the aircraft cabin was established based on the hybrid FE-SEA method, and the comparisons of the results between the hybrid model and the finite element sampling method were carried out. Charpentier et al [15] established the model of the car body with the trim and studied the rules for dividing the FE subsystems and the SEA subsystems. Cordioli et al [16] analyzed the sound insulation performance of the vehicle sealing system based on the hybrid FE-SEA method and obtained good prediction results.…”

Section: Introductionmentioning

confidence: 99%

Acoustic–structure modeling and analysis of an engineering machinery cab based on the hybrid method and experimental investigations

Jiao

Nguyen

Zhang

2020

J Braz. Soc. Mech. Sci. Eng.

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To study the mid-frequency acoustic-structure in the cab of construction machinery vehicle, a prediction model was established based on the FE-SEA hybrid method. Model parameters, such as the modal density, the internal loss factor and the coupling loss factor of each subsystem, were calculated by the theoretical methods. The sound pressure excitation and vibration excitation of the model obtained through the real vehicle experimental tests and the mid-frequency vibration characteristics of the cab in the frequency range of 100-800 Hz under composite excitation were studied. In order to verify the accuracy of the hybrid model, the full FE acoustic-structure coupling model of the cab was also established, and the modal calculation of the cab was carried out. In the end, the two methods were verified by the real sound pressure test in the cab. The results show that the hybrid model has a great deviation from the experimental results in the low-frequency region of 20-80 Hz, and the calculation accuracy is lower than that of the FE model. The prediction accuracy starts to rise when frequency is higher than 80 Hz; especially in the mid-frequency region of 100-800 Hz, the hybrid model accuracy reaches the highest with results basically consistent with the experiment. In addition, in the high-frequency range, higher than 800 Hz, the prediction results also agree well with the experimental ones. It should be pointed out that the hybrid model cannot accurately capture the peak value of the response in the noise prediction, but it can guarantee the accuracy, improve the calculation efficiency and improve the prediction accuracy in the mid-frequency region.

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Sound transmission loss of an automotive floor panel section with cross members

Wang

2023

Applied Acoustics

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Use of a Hybrid FE-SEA Model of a Trimmed Vehicle to Improve the Design for Interior Noise

Cited by 6 publications

References 2 publications

Mid Frequency Structure-Borne Noise Modeling in a Trimmed Automotive Vehicle

Mid Frequency Structure-Borne Noise Modeling in a Trimmed Automotive Vehicle

Acoustic–structure modeling and analysis of an engineering machinery cab based on the hybrid method and experimental investigations

Sound transmission loss of an automotive floor panel section with cross members

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