Estimation of Road Disturbance for a Non Linear Half Car Model Using the Independent Component Analysis

2018 ◽  
pp. 96-103
Author(s):  
Dorra Ben Hassen ◽  
Mariem Miladi ◽  
Mohamed Slim Abbes ◽  
S. Caglar Baslamisli ◽  
Fakher Chaari ◽  
...  
Keyword(s):  
Independent Component Analysis ◽  
Component Analysis ◽  
Independent Component ◽  
Car Model ◽  
Road Disturbance ◽  
Non Linear

scholarly journals Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results

2011 ◽  
Vol 18 (6) ◽  
pp. 925-940 ◽  
Author(s):  
E. De Lauro ◽  
S. De Martino ◽  
M. Falanga ◽  
M. Palo
Keyword(s):  
Independent Component Analysis ◽  
Seismic Waves ◽  
Volcanic Tremor ◽  
Component Analysis ◽  
Independent Component ◽  
Common Source ◽  
Magma Flow ◽  
Volcanic Source ◽  
Non Linear ◽  
Low Dimensionality

Abstract. We investigate the physical processes associated with volcanic tremor and explosions. A volcano is a complex system where a fluid source interacts with the solid edifice so generating seismic waves in a regime of low turbulence. Although the complex behavior escapes a simple universal description, the phases of activity generate stable (self-sustained) oscillations that can be described as a non-linear dynamical system of low dimensionality. So, the system requires to be investigated with non-linear methods able to individuate, decompose, and extract the main characteristics of the phenomenon. Independent Component Analysis (ICA), an entropy-based technique is a good candidate for this purpose. Here, we review the results of ICA applied to seismic signals acquired in some volcanic areas. We emphasize analogies and differences among the self-oscillations individuated in three cases: Stromboli (Italy), Erebus (Antarctica) and Volcán de Colima (Mexico). The waveforms of the extracted independent components are specific for each volcano, whereas the similarity can be ascribed to a very general common source mechanism involving the interaction between gas/magma flow and solid structures (the volcanic edifice). Indeed, chocking phenomena or inhomogeneities in the volcanic cavity can play the same role in generating self-oscillations as the languid and the reed do in musical instruments. The understanding of these background oscillations is relevant not only for explaining the volcanic source process and to make a forecast into the future, but sheds light on the physics of complex systems developing low turbulence.

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