TY  - CONF
AV  - none
CY  - Rio de Janeiro
KW  - EM algorithms; Expectation-maximization algorithms; Field measurement; Kalman smoother; Offshore engineering; RAOs; Response amplitude operator; Time-varying autoregressive
KW  -  Algorithms; Arctic engineering; Discrete Fourier transforms; Estimation; Measurements; Ocean engineering; Offshore structures
KW  -  Computer simulation
SP  - 105
TI  - Simulated field measurements based response amplitude operators estimation via the TVAR model
ID  - scholars2419
N2  - The purpose of this paper is to propose and investigate a new approach for estimating field measurements based response amplitude operators (RAOs) for offshore structures. The approach is based on applying time-varying autoregressive (TVAR) model. This work is virtually unexplored in offshore engineering field. In the literatures, a number of works have shown that RAO are discrete Fourier transform (DFT). Here, we outline a practical algorithm for TVAR model which uses expectation-maximization (EM) algorithm based Kalman smoother to generate RAOs of surge, heave and pitch motions. The method is then applied to sampled discrete wave as excitation input and motion responses of offshore structures as outputs, generated from simulated field measurements. The proposed approach outlined here has shown tremendous potential in the application of RAO estimation. The results indicate that TVAR model bring enhanced accuracy, less noisy in obtaining RAOs estimates over other Fourier based methods. TVAR model also allows for the creation of time-varying RAOs. Copyright © 2012 by ASME.
N1  - cited By 0; Conference of ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012 ; Conference Date: 1 July 2012 Through 6 July 2012; Conference Code:99325
SN  - 9780791844922
Y1  - 2012///
VL  - 5
EP  - 112
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884470724&doi=10.1115%2fOMAE2012-83239&partnerID=40&md5=d537ebd060e8a17153e47022e5c4f29c
A1  - Yazid, E.
A1  - Liew, M.S.
A1  - Parman, S.
ER  -