A New Approach Encoding a Priori Information for Function Approximation

2008 ◽  
Author(s):  
Fei Han ◽  
Tong-Yue Gu ◽  
Qing-Hua Ling
Keyword(s):  
Function Approximation ◽  
A Priori ◽  
A Priori Information ◽  
New Approach ◽  
Priori Information

scholarly journals Methods of substitution detected anomalous values in the realization of a random process

2018 ◽  
Vol 226 ◽  
pp. 05005 ◽  
Author(s):  
Vladimir I. Marchuk ◽  
Dmitriy Y. Chernyshov
Keyword(s):  
Random Process ◽  
A Priori ◽  
Statistical Characteristics ◽  
A Priori Information ◽  
Noise Component ◽  
New Approach ◽  
Correlation Relation ◽  
Priori Information

The paper considers a proposed method of detecting anomalous values in the realization of a random process in case of a limited amount of a priori information about the statistical characteristics of the noise component. A new approach is proposed to replace the detected anomalous values, which does not introduce a correlation relation into the results of the output pro-cessed random process.

A New Approach of Quantifying Top-Tensioned Risers Clashing by Using Wavelet Scalograms

2015 ◽  
Author(s):  
Shutao Xing ◽  
Wentao Dai ◽  
Dakshina Moorthy ◽  
Gangqiang Li
Keyword(s):  
Numerical Simulation ◽  
A Priori ◽  
Dynamic Responses ◽  
Impact Behavior ◽  
Design Phase ◽  
A Priori Information ◽  
New Approach ◽  
Priori Information ◽  
The Impact ◽  
Critical Consideration

Clashing or colliding can take place between a riser and its adjacent risers or other lines/structures. Clashing is of great concern for the design of top-tensioned riser (TTR) arrays in deep water. Understanding the impact behavior between risers is essential for developing reliable clashing mitigation approaches during design phase. Further, monitoring of risers clashing is useful during operation and installation of the systems. A critical consideration of clashing monitoring is how to quantify the impact. Traditional methods need a priori information which is difficult to be obtained accurately. This paper proposed a new method of monitoring risers clashing by using wavelet scalograms of dynamic responses that doesn’t need such priori information. The method was investigated through numerical simulation of a pair of TTR risers operated from tension-leg platform (TLP) that are subjected to current and floater motions. The wavelet scalograms of the risers’ velocities and accelerations were utilized to quantify impact. It was verified that the wavelet scalograms can indicate clashing severity quite well.

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