Study on Wavelet Denoising of Pulse Impact Force of Non-Viscosity Debris Flow

Abstract:

Noise filtering of impact load spectrum is the key to ensure the impact load of debris flow during the control engineering design of debris flow. As the laboratory impacting test indicates, noise effect in pulse impact force spectrum can be denoised using Daubechie(dbN)and Symlet(symN)wavelet methods, both of which contain hard threshold method and soft threshold method. Analyzed the pulse impact force of non-viscosity debris flow testing results by wavelet denoising method, the testing conditions are A-3(whose grain size is range from 0.3cm to 0.8cm), B-3(whose grain size is range from 0.8cm to 1.5cm) and C-3(whose grain size is range from 1.5cm to 3.0cm),all of whose solid phase ratio are 0.16.The analyzing results show that the denosing effect adopting Db5 wavelet function is superior to ones adopting Sym2 wavelet function, meanwhile, the denosing effect adopting hard threshold method is superior to ones adopting soft threshold method. The results also indicate that the bigger the solid phase ratio is, the bigger the Signal Noise Ratio is, the better the wavelet denosing effect is. These results could provide scientific basis for further accurate experimental study to ensure impact load of non-viscosity debris flow.

• Periodical: Applied Mechanics and Materials (Volumes 249-250)
• Pages: 1040-1046
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.249-250.1040
• Online since: December 2012
• Authors: Hong Kai Chen, Xiao Ying He, Hong Mei Tang, Lan Tang
• Keywords: Impacting Pulsating Load, Impacting Test, Non-Viscosity Debris Flow, Wavelet Denoising

References

[1] R. A. Bagnold. Proc., Royal Soc. of London, 225. A(1954).

[2] S. B. Savage. Journal of Fluid Mechanics, 92. 1 (1979).

[3] Wei H. China Railway Science, 17. 3 (1996).

[4] R. Valentino, G. Barla, and L. Montrasio. Rock Mechanics and Rock Engineering, 41. 1 (2008).

[5] Chen H. K, Tang H. M. China Journal of Highway and Transport. 19. 3 (2006).

[6] Wu J. S. Science Press, Beijing(1990).

[7] M. D. Ortigueira, C. J. C. Matos, and M. S. Piedade. Nonlinear Dynamics. 29 (2002).

[8] F. Ahmed and N. Kishi. Optical Review, 1. 1 (2003).

[9] Chen H. K. , Tang H. M. , Xian X. F. , et al. Journal of Vibration and Shock, 29. 8 (2010).

[10] Chen H. K. , Tang H. M. , Zhang Y. P. , and He X. Y. 2011 AASRI Conference on Applied Information Technology, Kota Kinabalu, Malaysia, 3 (2011).

[11] Sun Y. L, Liu D. M. Journal of Wuhan University of Hydraulic and Electric Engineering , 36. 2 (2003).

[12] Zou K. , Yuan J. Q, Gong X. B. Tsinghua University Press, Beijing (2002).

[13] Chen H. K., Tang H. M. , Xian X. F. Journal of Chongqing University. 33. 5 (2010).

[14] Qian N. , Wan Z. H. Science Press, Beijing (2003).

[15] R. M. Iverson, and R. P. Denlinger. Journal of Geophysical Research, 106. B1 (2001).

[16] P. Brufau, P. Garcia-Navarro, P. Ghilardi, L. Natale, and P. Savi. Journal of Hydraulic Research, 38. 6 (2000).

DOI: 10.1080/00221680009498297

[17] Chen H. K., Tang H. M., and Chen Y. Y. Applied Mathematics and Mechanics. 27. 3 (2006).