Subsea cable tracking in an uncertain environment using particle filters

In today’s world of global wicked problems, constraints and imperatives imposed by an external and uncertain environment render strategic action a quite complex endeavour. Since the 1990s, within community initiatives and philanthropic projects, the construct of Theory of Change has been used to address such complexity. Theory of Change can be defined as the systematic and cumulative study of the links between the activities, outcomes, and context of an intervention. The area of focus for this paper is to explore whether Theory of Change can support more strategic approaches in design. In particular, the paper examines how Theory of Change was applied to DESIGNSCAPES - a project oriented, among other things, toward offering a supporting service for all those city actors interested in using design to develop urban innovation initiatives that tackle complex issues of broad concern.

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Standard and Gaussian Particle Filters for Nonlinear System with Missing Measurements

2020 39th Chinese Control Conference (CCC) ◽

10.23919/ccc50068.2020.9188919 ◽

2020 ◽

Author(s):

Xing Zhang ◽

Zhibin Yan

Keyword(s):

Nonlinear System ◽

Particle Filters ◽

Missing Measurements

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Effect of leakage and blockage on the acoustic behavior of particle filters

Noise Control Engineering Journal ◽

10.3397/1/376744 ◽

2019 ◽

Vol 67 (6) ◽

pp. 483-492

Author(s):

Seonghyeon Baek ◽

Iljae Lee

Keyword(s):

Transfer Matrix ◽

Particle Filters ◽

Acoustic Analysis ◽

Transmission Loss ◽

One Dimensional ◽

Filter System ◽

The Difference ◽

The One ◽

Analytical Approaches ◽

Good Agreement

The effects of leakage and blockage on the acoustic performance of particle filters have been examined by using one-dimensional acoustic analysis and experimental methods. First, the transfer matrix of a filter system connected to inlet and outlet pipes with conical sections is measured using a two-load method. Then, the transfer matrix of a particle filter only is extracted from the experiments by applying inverse matrices of the conical sections. In the analytical approaches, the one-dimensional acoustic model for the leakage between the filter and the housing is developed. The predicted transmission loss shows a good agreement with the experimental results. Compared to the baseline, the leakage between the filter and housing increases transmission loss at a certain frequency and its harmonics. In addition, the transmission loss for the system with a partially blocked filter is measured. The blockage of the filter also increases the transmission loss at higher frequencies. For the simplicity of experiments to identify the leakage and blockage, the reflection coefficients at the inlet of the filter system have been measured using two different downstream conditions: open pipe and highly absorptive terminations. The experiments show that with highly absorptive terminations, it is easier to see the difference between the baseline and the defects.

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