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 Posted: Sat 4:42, 11 Dec 2010 Post subject: ugg prezzo Vortex Flow Signal characteristics of t |
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Vortex Flow Signal characteristics of the chaotic background noise
. Quantitatively describe the parameters of fractal characteristics of fractal dimension. Change at any time ask for some l58 measure the amount of April 2005 the dimensions used to calculate the box dimension. subset of n dimensional Euclidean space, the box dimension D is defined as:,,. . Assuming the limit exists 1og (,)_-=, where (,) has many definitions in the form, the paper selected for the cover, the minimum edge length of cube number. Box dimension definition of this form in practice a wide range of applications. To calculate a plane set, the box dimension, can construct a number of side length of square or as a box, and then calculate the different values of the \This dimension is when a 0,[link widoczny dla zalogowanych], (,) to increase the number of the logarithmic rate, or you can by the function log (,) relative to the slope value l0g Figure 4 Conclusion log velocity 0.6m / s estimated '. Figure 6 for different flow rates vortex noise curve of the box dimension, in which horizontal and vertical coordinates on the number of coordinates, the least square fitting it, the virtual line in Figure 6, the slope is the imaginary straight line The box dimension obtained. Table 2 shows the different flow rates calculated noise value of the box dimension, can be found with the flow rate increases, also increasing the box dimension, fractal theory known by the chaos, chaos vortex noise is also increased, this result values obtained with the previous results deduced are consistent. Table 2 vortex velocities box dimension of the noise signal value velocity 0.7m / s velocity of 0.8m / s Figure 6 under different flow vortex noise signal box dimension graph paper proposes a new vortex ideas flow signal analysis, that the introduction of chaos theory, and in certain experimental conditions were analyzed, the results obtained shows that the experimental conditions in the vortex flow is a chaotic noise signal, which the study of vortex traffic signals, extended vortex measurement limit, has a positive effect. Of course, the vortex flow measuring many factors involved,[link widoczny dla zalogowanych], demanding the experimental device, the device collected from different experimental data and calculated results may be slightly different, but the text of the experimental device is a good representative of. Hope that the ideas and experimental results on the measurement of some reference value. [References] [1] vallBokhorstE,[link widoczny dla zalogowanych], PetersMCAM. Atestcertificateontheimpactofpipingandflowdy ~ miceffectsonflowmeteraccuracyingasandhquidflows [A]. Washington, D. C: Proceedingsofthe5thIntlSymponFluidFlowMeasurement [C]. 2OO2. [2] PusayatanontM, HighamEH. Analysisofthesensorsignalfromavortexflowmetertorecovel \Groningen,[link widoczny dla zalogowanych], TheNetherlands: Proem-dingsofFLOMEKO [C]. 2003. [3] Jiang Zhongxia. Vortex flowmeter measures the interference and field applications [J]. Automation Instrumentation, 1992,13 ( :31-36. [4] LW good. Chaotic vibration of [M]. Beijing: Tsinghua University Press, 1997. [5] Wang Lingling, Huang fine Bin, Jin Zhongqing. With a strange attractor theory of turbulence fluctuating pressure characteristics [J]. Hohai University (Natural Science), 2001,29 (3) :8-11. [6] Zhang Shuqing, Wu Yuee, Jiao Guang He. Chaos Theory feasibility of the method of weak signal detection analysis [J]. Control Technology, 2002,21 (7) :53-54. [7] Hu Changhua, Zhang, Bo Xia, et al. MATLAB-based system analysis and design of a wavelet analysis [M]. Xi'an: Xidian University Press, 1999. [8] Ding Qinghai,[link widoczny dla zalogowanych], Zhuang Zhihong, I wish the dragon stone, and so on. Chaos, fractal and wavelet theory in the passive acoustic signal feature extraction application [J]. Acoustics, 1999,24 (2) :197-203. [9] Wang Dongsheng, Cao Lei. Chaos, Fractal and Its Application [M]. Hefei: China Science and Technology University Press, 1995. [1O] Liu Shida, Liu Shikuo. Fractal and fractal dimension Introduction [M]. Beijing: Meteorological Press, 1993.
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