By computing the probability distributions of the velocity difference between cars a time-delay τ... more By computing the probability distributions of the velocity difference between cars a time-delay τ apart, the scaling properties of traffic flow can be analysed. These data display scaling behaviour thus confirming earlier results that have found 1/ fα -noise in traffic flow. Furthermore, the applicability of the scaling analysis for describing the two-point statistics of traffic flow is demonstrated, leading to an additional test for the dynamical properties of microscopic and macroscopic traffic flow models.
A new application of the theory of Markov processes to the characterization of fractal scaling be... more A new application of the theory of Markov processes to the characterization of fractal scaling behavior is presented. We show under which condition distinct stochastic processes of a cascade lead to multifractal scaling behavior. We apply our method to the analysis of the statistical properties of the energy in turbulent fluid flow.
We present the second prototype of a new kind of Laser Cantilever Anemometer (LCA). Using the sam... more We present the second prototype of a new kind of Laser Cantilever Anemometer (LCA). Using the same elements as for an atomic force microscope we are able to measure highly accurately the local velocity. The spatial resolution is given by a micro-structured cantilever (at the current state 150 mu m ot 40 mu m ot 5 mu m) which can be scanned with up to 100 kHz. The LCA is constructed for any transparent fluids. In contrast to the hotwire anemometer there is no problem for measurements in flows with high thermal conductivity e.g. water. We show first measurements in turbulent flows. S. Barth, S. Schlueter, S. Lueck, J. Peinke, Advances in Turbulence IX, I.P. Castro, P.E. Hancock, T.G. Thomas (Eds.) (CIMNE Barcelona 2002), p.488 and Patent application DE 198 22 125.8-52 (Peinke et al. 1998)
In this paper changes in wind speed and wind direction from a measured wind field are being analy... more In this paper changes in wind speed and wind direction from a measured wind field are being analyzed at high frequencies. This is used to estimate changes in the angle of attack (AOA) on a blade segment over short time periods for different estimated turbine concepts. Here a statistical approach is chosen to grasp the characteristics of the probability distributions to give an over all view of the magnitude and rate of the changes. The main interest is the generation of basic distributions for the calculation of dynamic stall effects and stall flutter due to wind fluctuations.
By computing the probability distributions of the velocity difference between cars a time-delay τ... more By computing the probability distributions of the velocity difference between cars a time-delay τ apart, the scaling properties of traffic flow can be analysed. These data display scaling behaviour thus confirming earlier results that have found 1/ fα -noise in traffic flow. Furthermore, the applicability of the scaling analysis for describing the two-point statistics of traffic flow is demonstrated, leading to an additional test for the dynamical properties of microscopic and macroscopic traffic flow models.
A new application of the theory of Markov processes to the characterization of fractal scaling be... more A new application of the theory of Markov processes to the characterization of fractal scaling behavior is presented. We show under which condition distinct stochastic processes of a cascade lead to multifractal scaling behavior. We apply our method to the analysis of the statistical properties of the energy in turbulent fluid flow.
We present the second prototype of a new kind of Laser Cantilever Anemometer (LCA). Using the sam... more We present the second prototype of a new kind of Laser Cantilever Anemometer (LCA). Using the same elements as for an atomic force microscope we are able to measure highly accurately the local velocity. The spatial resolution is given by a micro-structured cantilever (at the current state 150 mu m ot 40 mu m ot 5 mu m) which can be scanned with up to 100 kHz. The LCA is constructed for any transparent fluids. In contrast to the hotwire anemometer there is no problem for measurements in flows with high thermal conductivity e.g. water. We show first measurements in turbulent flows. S. Barth, S. Schlueter, S. Lueck, J. Peinke, Advances in Turbulence IX, I.P. Castro, P.E. Hancock, T.G. Thomas (Eds.) (CIMNE Barcelona 2002), p.488 and Patent application DE 198 22 125.8-52 (Peinke et al. 1998)
In this paper changes in wind speed and wind direction from a measured wind field are being analy... more In this paper changes in wind speed and wind direction from a measured wind field are being analyzed at high frequencies. This is used to estimate changes in the angle of attack (AOA) on a blade segment over short time periods for different estimated turbine concepts. Here a statistical approach is chosen to grasp the characteristics of the probability distributions to give an over all view of the magnitude and rate of the changes. The main interest is the generation of basic distributions for the calculation of dynamic stall effects and stall flutter due to wind fluctuations.
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Papers by J. Peinke