Please wait a minute...
ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (Supplement 2): 357-361    DOI: 10.1631/jzus.2006.AS0357
Original Paper     
A study of acoustical characteristics of pine nut based on a fractal dimension method
Li Jian-Ping, Wei Bao-Gang
School of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou 310029, China; School of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China
Download:     PDF (0 KB)     
Export: BibTeX | EndNote (RIS)      

Abstract  The structure difference of pine nuts was tested on the basis of their acoustical characteristics in order to distinguish whether they were open or closed. In this experimental study, pine nuts were dropped from a certain height onto a ceramic board; the impinging sound was recorded by a microphone. The sound wave graph and frequency spectrum graph were obtained while the impinging sound was analyzed by computer. Fractal dimension was calculated on sound wave graph and frequency spectrum graph of open and closed pine nuts. The result of test and analysis showed that the sound wave fractal dimension of open pine nuts was smaller than that of closed ones. The frequency spectrum fractal dimension of open pine nuts was larger than that of closed pine nuts. Fractal dimension of sound wave and frequency spectrum could be used as important indices to distinguish whether the pine nut was open or not.

Key words： Pine nut      Acoustical characteristic      Frequency spectrum      Fractal     
Received: 02 March 2006     
CLC:  S664.9  
  O42  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Li Jian-Ping
Wei Bao-Gang
Cite this article:

Li Jian-Ping, Wei Bao-Gang. A study of acoustical characteristics of pine nut based on a fractal dimension method. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(Supplement 2): 357-361.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.AS0357     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/ISupplement 2/357

[1] Peng Liu, Jiu-hua Xu, Yu-can Fu. Cutting force and its frequency spectrum characteristics in high speed milling of titanium alloy with a polycrystalline diamond tool[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2011, 12(1): 56-62.
[2] WANG Gang, REN Xiao-mei, LI Lei, WANG Zhi-zhong. Multifractal analysis of surface EMG signals for assessing muscle fatigue during static contractions[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(6): 910-915.
[3] CHENG Jin, TAN Jian-rong. Generalization of 3D Mandelbrot and Julia sets[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(1 ): 19-.
[4] Wang Qian-Ting, Guo Jian, Chen Yi-Zhi. Fractal modelling of off-road terrain oriented to vehicle virtual test[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(Supplement 2): 287-292.
[5] Wei Bao-gang, Li Jian-ping, Pang Xiang-bin. Using texture synthesis in fractal pattern design[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(3 ): 2-.
[6] GU Hong-ying, ZHUANG Yue-ting, PAN Yun-he. An iris recognition method based on multi-orientation features and Non-symmetrical SVM[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6( 5): 12-.
[7] YAO Min, YI Wen-sheng, SHEN Bin, DAI Hong-hua. An image retrieval system based on fractal dimension[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2003, 4(4): 421-425.