The ability of the structural intensity (STI) to predict changes in the sound radiation of structures due to geometric modifications is investigated using the academic example of plate-rib models. All models consist of the same plate and are modified by attaching a rib, whose position, orientation, and length are varied. Various scalar quantities are derived from the STI and quantitatively compared to the equivalent radiated sound power (ERP) for each model. Based on this comparison the relation between the STI-based scalars and the ERP is studied to determine an STI-based scalar that can serve as the objective function for numerical structural optimizations. The influence of the rib parameters on the most promising STI-based scalar is analyzed by means of a variance-based sensitivity analysis. The STI pattern of those models with very high and very low ERP values are additionally analyzed to describe the characteristics of STI. The results of this study indicate that the STI pattern of models with low ERP has paths and vortices that can be more clearly identified compared to those in models with high ERP. The angular orientation of the rib has by far the highest influence on changes in STI and ERP. The results reveal a correlation between the energy flow into a specific region of a structure, an STI-based scalar, and the ERP. Therefore, the vibrational energy flow can indeed serve as an objective function for numerical structural optimizations aiming at reducing the sound radiation.
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August 2016
Research-Article
Relation Between Structural Intensity-Based Scalars and Sound Radiation Using the Example of Plate-Rib Models
Clarissa Schaal,
Clarissa Schaal
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: schaal@szm.tu-darmstadt.de
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: schaal@szm.tu-darmstadt.de
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Johannes Ebert,
Johannes Ebert
Structure-borne Sound and Vibrations,
Department of Structural Dynamics,
BMW Group,
80788 München, Germany
e-mail: johannes.ebert@bmw.de
Department of Structural Dynamics,
BMW Group,
80788 München, Germany
e-mail: johannes.ebert@bmw.de
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Joachim Bös,
Joachim Bös
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: boes@szm.tu-darmstadt.de
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: boes@szm.tu-darmstadt.de
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Tobias Melz
Tobias Melz
Professor
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: melz@szm.tu-darmstadt.de
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: melz@szm.tu-darmstadt.de
Search for other works by this author on:
Clarissa Schaal
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: schaal@szm.tu-darmstadt.de
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: schaal@szm.tu-darmstadt.de
Johannes Ebert
Structure-borne Sound and Vibrations,
Department of Structural Dynamics,
BMW Group,
80788 München, Germany
e-mail: johannes.ebert@bmw.de
Department of Structural Dynamics,
BMW Group,
80788 München, Germany
e-mail: johannes.ebert@bmw.de
Joachim Bös
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: boes@szm.tu-darmstadt.de
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: boes@szm.tu-darmstadt.de
Tobias Melz
Professor
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: melz@szm.tu-darmstadt.de
System Reliability and Machine Acoustics SzM,
Department of Mechanical Engineering,
Technische Universität Darmstadt,
64289 Darmstadt, Germany
e-mail: melz@szm.tu-darmstadt.de
Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received December 16, 2014; final manuscript received March 29, 2016; published online May 25, 2016. Assoc. Editor: Lonny L. Thompson.
J. Vib. Acoust. Aug 2016, 138(4): 041011 (9 pages)
Published Online: May 25, 2016
Article history
Received:
December 16, 2014
Revised:
March 29, 2016
Citation
Schaal, C., Ebert, J., Bös, J., and Melz, T. (May 25, 2016). "Relation Between Structural Intensity-Based Scalars and Sound Radiation Using the Example of Plate-Rib Models." ASME. J. Vib. Acoust. August 2016; 138(4): 041011. https://doi.org/10.1115/1.4033339
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