Optimization of Roof Drumming Noise between Roof Bow and Roof Panel in a Small Utility Vehicle

The roof panel and roof bow are critical components of the Body-in-White (BIW) structure, significantly influencing vehicle strength, durability, and NVH (Noise, Vibration, and Harshness) performance. Poor design in these areas can lead to NVH deterioration, resulting in discomfort for occupants. The roof bow must meet key functional requirements such as durability, fatigue resistance, and noise control under normal operating conditions. Incorporating design considerations early in the development phase such as material selection, geometry, and joining techniques can help shorten the product development timeline for OEMs. Adopting a "first-time-right" approach enables efficient optimization of the roof bow design, ensuring performance targets are met while also achieving long-term cost savings.
This paper describes the robust and optimal design for standard roof panels and roof bows of small utility vehicles. The structure meets the required operating conditions for durability and passes NVH target above 20 Hz. Finite element models are developed with different control factors that influence structure design. In this paper evaluates the impact of each component on the noise produced by the drumming of the roof and demonstrates how the integration of multiple factors can be skilfully utilized to create an ideal and resilient design that remains lightweight in the context of vehicle operation conditions. The final robust and optimized FEM design is proposed to eliminate the roof drumming noise in the small utility vehicle.

Roof bows & panel, FEM, Modal frequency, and Roof drum noise

1. Duan, L. B., G. Y. Sun, J. J. Cui, T. Chen, A. Cheng, and G. Li. 2016. “Crashworthiness Design of Vehicle Structure with Tailor Rolled Blank.” Structural and Multidisciplinary Optimization 53 (2): 321–338. [Google Scholar] [Crossref]

2. Zhang, Y., X. M. Lai, P. Zhu, and W. Wang. 2006. “Lightweight Design of Automobile Component Using High Strength Steel Based on Dent Resistance.” Materials and Design 27 (1): 64–68. [Google Scholar] [Crossref]

3. Li, Y., Z. Q. Lin, A. Jiang, and G. Chen. 2003. “Use of High Strength Steel Sheet for Lightweight and Crashworthy Car Body.” Materials and Design 24 (3): 177–182 [Google Scholar] [Crossref]

4. Pan, F., P. Zhu, and Y. Zhang. 2010. “Metamodel-Based Lightweight Design of B-Pillar with TWB Structure via Support Vector Regression.” Computers and Structures 88 (1–2): 36–44. [Google Scholar] [Crossref]

5. Pan, F., and P. Zhu. 2011. “Lightweight Design of Vehicle Front End Structure: Contributions of Multiple Surrogates.” International Journal of Vehicle Design 57 (2–3):124–147. [Google Scholar] [Crossref]

6. Bhosale, S., Malladi, A., and Londhe, A., "Comparing Various Multi-Disciplinary Optimization Approaches for Performance Enhancement and Weight Reduction of a Vehicle Chassis Frame", SAE Int. J. Mater. Manf. 9(2):430–435, 2016, doi:10.4271/2016-01-0305 [Google Scholar] [Crossref]

7. Sobieszczanski-Sobieski, J., Kodiyalam, S., Yang, R. Y., "Optimization of car body under constraints of noise, vibration, and harshness (NVH), and crash", STRUCT MULTIDISCIP O 22(4):295–306, 2001, DOI:10.1007/s00158-001-0150-6 [Google Scholar] [Crossref]

8. Zhang, J., Hu, S., Guo, X., and Zhou, Q., "Multidisciplinary Design Optimization of BEV Body Structure", SAE Technical Paper 2015-26-0229, 2015, doi:10.4271/2015-26-0229 [Google Scholar] [Crossref]

9. Citarella, R., Federico, L., Cicatiello, A., "Modal acoustic transfer vector approach in a FEM–BEM vibro-acoustic analysis", ENG ANAL BOUND ELEM 31(3):248–258, 2007, DOI: 10.1016/j.enganabound.2006.09.004 [Google Scholar] [Crossref]

10. Zhan, Z., Fu, Y., and Yang, R., "A Stochastic Bias Corrected Response Surface Method and its Application to Reliability Based Design Optimization", SAE Int. J. Mater. Manf. 7(2):262– 268, 2014, doi:10.4271/2014-01-0731 [Google Scholar] [Crossref]

11. Mohanty A. R., “Acoustical Materials for Automotive NVH Reduction”, Solid [Google Scholar] [Crossref]

12. Mechanics and its Applications, 2002, 102, 21-25. [Google Scholar] [Crossref]

13. Fatima S. and Mohanty A. R., “Acoustical and Fire-Retardant Properties of Jute Based Composite Materials”, Applied Acoustics, 78, 108-114. [Google Scholar] [Crossref]

14. ASTM E1050-12 Standard, Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System, ASTM International [Google Scholar] [Crossref]

15. SAE J 1400-2010, “Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies”, SAE International [Google Scholar] [Crossref]

16. Fang Yuanqiao, Chen Anning, Dong Weiping. “The Finite Element Method the Principle and Numerical Method” M. Beijing: National Defense Industry Press,1993 [Google Scholar] [Crossref]

17. The horse Tianfei, Wang Dengfeng, Liu Wenping. “A Study on the Modal Analysis and Test on the Cab Body-in-white of Heavy Commercial Vehicle(J)”. Automotive Engineering,2009(7):616-619 [Google Scholar] [Crossref]

18. Santos FM, Temarel P, Soares CG. “Modal Analysis of a Fast Patrol Boat Made of Composite Material [J]. Ocean Engineering, 2009, 36: 179-192. [Google Scholar] [Crossref]

19. Wang Xucheng, Shao min. “Finite Element Method Basic Theory and Numerical Method [M]”. (2nd edition). Beijing: Tsinghua University press,1997 [Google Scholar] [Crossref]

20. Chen Zhiyong, history library, Shen Zhihong, et al. “Modal Analysis for Body and Frame of a Light-type Bus” [ J]. Journal of vibration and shock,2010(10):244-24 [Google Scholar] [Crossref]