Weight Optimization of Sandwich Panel with Acoustic Constraints,Experimental Verification

Abstract

Weight optimization of a sandwich panel was performed. The constraints were both mechanical, in the form of stiffness and strength constraints, and acoustic, in the form of a required sound reduction index, R. The sound reduction index of the optimized panel and an initial configuration was measured under laboratory conditions and the results were compared to predicted values. Predictions and measurements of the sound reduction index were made in third-octave frequency bands. It was shown that the difference in R between the initial panel and the optimized one was predictable using the acoustic models and that the optimized panel fulfilled the constraints. The weighted average reduction index, R_W, was also used to provide an engineering number for comparison.

Get full access to this article

View all access options for this article.

References

1. Andersson, E. , Kottenhoff, K. and Ostlund, S. (1999). Efficient passenger trains for the future. In: Proceedings of World Congress on Railway Research. WCRR ’99.

2. Huybrechts, D. (1998). Dimensioning of wound sandwich tramway carriage. In: Olsson, K.-A. (ed.), Proceedings of the 4th International Conference on Sandwich Construction. Stockholm, Sweden. Vol. 1. pp. 107-118. Solihull, UK: EMAS.

3. Wang, X. , Starlinger, A. , Dean, R.J. and Wieschermann, J. (2000). The application of sandwich components in the design of the new transrapid Maglev TR08 vehicles. In: Meyer-Piening, H.-R. and Zenkert, D. (eds.), Proceedings of the 5th International Conference on Sandwich Construction. Zurich, Switzerland. Vol. 2. pp. 539-549. Solihull, UK: EMAS.

4. Wennhage, P. (2001). Weight minimization of sandwich panels with acoustic and mechanical constraints. Journal of Sandwich Structures & Materials, 3: 22-49.

5. Orrenius, U. and Wennhage, P. (July 2000). Noise control of light weight carbodies in trains: application to sandwich technologies. In: Guidati, G. , Hunt, H. , Heller, H. and Heiss, A. (eds.), Proceedings of the 7th International Congress on Sound and Vibration. Garmich-Partenkirchen, Germany: Kramer Technology Publishing and IIVA. pp. 3051-3058.

6. Dym, C.L. , Ventres, C.S. and Lang, M.A. (1976). Transmission of sound through sandwich panels: a reconsideration. Journal of the Acoustical Society of America, 59: 364-367.

7. Lang, M.A. and Dym, C.L. (1975). Optimal acoustic design of sandwich panels. Journal of the Acoustical Society of America, 57: 1481-1487.

8. Hambric, S.A. (1995). Approximation techniques for broad-band acoustic radiated noise design optimization problems. ASME Journal of Vibration and Acoustics, 117: 136-144.

9. Hambric, S.A. (1996). Sensitivity calculations for broad-band acoustic radiated noise design optimization problems. ASME Journal of Vibrations and Acoustics, 118: 529-532.

10.

10. Nilsson, A.C. (1990). Wave propagation in and sound transmission through sandwich plates. Journal of Sound and Vibration, 138: 73-94.

11.

11. Cremer, L. , Heckl, M. and Ungar, E.E. (1988). Structure-Borne Sound. Berlin: Springer-Verlag.

12.

12. Svanberg, K. (1993). The method of moving asymptotes (MMA) with some extensions. In: Rozvany, G.I.N. (ed.), Optimization of Large Structural Systems. Vol. 1. pp. 555-566. Kluwer.