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| 1 | A Robust Damage Detection Method Developed for Offshore Jacket Platforms Using Modified Artificial Immune System Algorithm显示文摘Steel jacket-type platforms are the common kind of the offshore structures and health monitoring is an important issue in their safety assessment.In the present study,a new damage detection method is adopted for this kind of structures and inspected experimentally by use of a laboratory model.The method is investigated for developing the robust damage detection technique which is less sensitive to both measurement and analytical model uncertainties.For this purpose,incorporation of the artificial immune system with weighted attributes(AISWA) method into finite element(FE) model updating is proposed and compared with other methods for exploring its effectiveness in damage identification.Based on mimicking immune recognition,noise simulation and attributes weighting,the method offers important advantages and has high success rates.Therefore,it is proposed as a suitable method for the detection of the failures in the large civil engineering structures with complicated structural geometry,such as the considered case study. | Mojtahedi A. Lotfollahi Yaghin M.A. Hassanzadeh Y. Abbasidoust F. Ettefagh M.M. Aminfar M.H. | 2012 | China Ocean Engineering2012，26，3： | 4 |
| 2 | Experimental Investigation of TARMAX Model for Modeling of Hydrodynamic Forces on Cylinder-like Structures显示文摘A new approach that models lift and drag hydrodynamic force signals operating over cylindrical structures was developed and validated. This approach is based on stochastic auto regressive moving average with exogenous (ARMAX) input and its time-varying form, TARMAX. Model structure selection and parameter estimation were discussed while considering the validation stage. In this paper, the cylindrical structure was considered as a dynamic system with an incoming water wave and resulting forces as the input and outputs, respectively. The experimental data, used in this study, were collected from a full-scale rough vertical cylinder at the Delft Hydraulics Laboratory. The practicality of the proposed method and also its efficiency in structural modeling were demonstrated through applying two hydrodynamic force components. For this purpose, an ARMAX model is first used to capture the dynamics of the process, relating in-line forces provided by water waves;secondly, the TARMAX model was applied to modeling and analysis of the lift forces on the cylinder. The evaluation of the lift force by the TARMAX model shows the model is successful in modeling the force from the surface elevation. | M. A. Lotfollahi Yaghin A. Mojtahedi M. M. Ettefagh M. H. Aminfar | 2011 | Journal of Marine Science and Application2011，10，3： | 2 |
| 3 | Study of the Functions of Wavelet Packet Transform (WPT) and Continues Wavelet Transform (CWT) in Recognizing the Damage Specification显示文摘 | Mahdi Koohdaragh M. A. Loffollahi Yaghin S. Sepehr F. Hosseyni | 2011 | Journal of Civil Engineering and Architecture2011，5，9： | 2 |
| 4 | De veloping a robust SHM method for offshore jacket platform using model updating and fuzzy logic system显示文摘 | Mojtahedi A Lotfollahi Yaghin M A Hassanzadeh Y | 2011 | Applied Ocean Re- search2011，33，： | 1 |
| 5 | Developing a robust SHM method for offshore jacket platform using model updating and fuzzy logic system显示文摘 | A. Mojtahedi M.A. Lotfollahi Yaghin Y. Hassanzadeh M.M. Ettefagh M.H. Aminfar A.B. Aghdam | 2011 | Applied Ocean Research2011，，4： | 1 |
| 6 | Dynamics analysis of the arch concrete dam under earthquake force with ABAQUS显示文摘 | Yaghin M A Hesari M A | 2008 | Journal of Applied Sciences2008，8，15： | 1 |
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