Abstract
In this study, the influence of the measurement noise in LDV measurements were considered, and how to remove the noise using Complex Discrete Wavelet Transform (CDWT) was proposed. Then turbulent velocity in the combustion chamber measured with an LDV was analyzed. The major results can be summarized as follows : 1) The influence of the noise in the turbulent velocity becomes large as frequency increases. Therefore, a setup of cutoft frequency is difficult when removing the noise with a lowpass filter. 2) In this case, it is effective to remove the noise using the CDWT because of improvement of translation invariance.
| Original language | English |
|---|---|
| Pages (from-to) | 2914-2921 |
| Number of pages | 8 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 70 |
| Issue number | 699 |
| Publication status | Published - Nov 2004 |
| Externally published | Yes |
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Keywords
- Discrete Wavelet Transform
- Ldv Measurements
- Noise
- Turbulent Velocity
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
Application of discrete wavelet transform in a combustion chamber to turbulence measurement with LDV removing; Noise in measurement data using wavelet shrinkage. / Zhang, Zhong; Tomita, Eiji.
In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 70, No. 699, 11.2004, p. 2914-2921.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Application of discrete wavelet transform in a combustion chamber to turbulence measurement with LDV removing; Noise in measurement data using wavelet shrinkage
AU - Zhang, Zhong
AU - Tomita, Eiji
PY - 2004/11
Y1 - 2004/11
N2 - In this study, the influence of the measurement noise in LDV measurements were considered, and how to remove the noise using Complex Discrete Wavelet Transform (CDWT) was proposed. Then turbulent velocity in the combustion chamber measured with an LDV was analyzed. The major results can be summarized as follows : 1) The influence of the noise in the turbulent velocity becomes large as frequency increases. Therefore, a setup of cutoft frequency is difficult when removing the noise with a lowpass filter. 2) In this case, it is effective to remove the noise using the CDWT because of improvement of translation invariance.
AB - In this study, the influence of the measurement noise in LDV measurements were considered, and how to remove the noise using Complex Discrete Wavelet Transform (CDWT) was proposed. Then turbulent velocity in the combustion chamber measured with an LDV was analyzed. The major results can be summarized as follows : 1) The influence of the noise in the turbulent velocity becomes large as frequency increases. Therefore, a setup of cutoft frequency is difficult when removing the noise with a lowpass filter. 2) In this case, it is effective to remove the noise using the CDWT because of improvement of translation invariance.
KW - Discrete Wavelet Transform
KW - Ldv Measurements
KW - Noise
KW - Turbulent Velocity
UR - http://www.scopus.com/inward/record.url?scp=12744267903&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12744267903&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:12744267903
VL - 70
SP - 2914
EP - 2921
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 699
ER -