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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 | On the characteristics of new ductile knee bracing systems显示文摘 | Massood Mofid Mehrdad Lotfollahi | 2005 | Journal of Constructional Steel Research2005，，3： | 1 |
| 4 | On the characteristics of new ductile knee bracing systems显示文摘 | Massood M Lotfollahi M | 2006 | Journal of Constructional Steel Research2006，62，： | 1 |
| 5 | Effect of nitrogen fertilizer placement on grain protein concentration of wheat under different water regimes 显示文摘 | Lotfollahi M | 1997 | Australian Journal of Agricultural Research1997，48，2： | 1 |
| 6 | 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 |
| 7 | Effect offriction stir processing on erosion-corrosion behavior of nickel-alu-minum bronze显示文摘 | LOTFOLLAHI M SHAMAN1AN M SAATCHI A | 2014 | Materials and Design2014，，62： | 1 |
| 8 | Innovative method in seismic designof slab-on-girder steel bridges显示文摘 | Lotfollahi M Mofid M | 2008 | Journal of Constructional Steel Research2008，64，12： | 1 |
| 9 | On the characteristics of new ductile knee bracing systems 显示文摘 | Massood Mofid Mehrdad Lotfollahi | 2006 | Journal of Constructional Steel Research2006，62，2006： | 1 |
| 10 | On the characteristics of new ductile knee bracing systems显示文摘 | Lotfollahi M Mofid M | | 0，，： | 1 |
| 11 | 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 |
| 12 | On the Characteristics of New Ductile Knee Bracing Systems 显示文摘 | Mofid M Lotfollahi M | 2006 | Journal of Constructional Steel Research2006，62，： | 1 |
| 13 | Extraction of Benzene from a Narrow Cut of Naphtha via Liquid-Liquid Extraction Using Pure Sulfolane and 2-Propanol-Sulfolane-Mixed Solvents 显示文摘 | Mohammad J Lotfollahi M N | 2010 | KoreanJChemEng2010，27，1： | 1 |
| 14 | On the characteristics of new ductile knee bracing systems 显示文摘 | Massood M Lotfollahi M | 2006 | Journal of Constructional Steel Research2006，62，： | 1 |
| 15 | On the Characteristics of New Ductile Knee Bracing Systems显示文摘 | Massood Mofid Mehrdad Lotfollahi | 2006 | Journal of Constructional Steel Research2006，62，3： | 1 |
| 16 | On the Design of New Ductile Knee Bracing 显示文摘 | Mehrdad Lotfollahi Massood Mofid | 2006 | Journal of Constructional Steel Research2006，62，3： | 1 |
| 17 | On the characteristics of new ductile knee bracing systems显示文摘 | Massod M Lotfollahi M | 2006 | Journal of Constructional Steel Research2006，62，3： | 1 |
| 18 | Extraction of benzene from a narrow cut of naphtha via liquid-liquid extraction using pure-sulfolane and 2-propanol-sulfolane-mixed solvents显示文摘 | Jafar Mahmoudi Mohammad Nader Lotfollahi | 2010 | Korean Journal of Chemical Engineering2010，，1： | 1 |
| 19 | Wavenet ability as sessment in comparison to ANN for predicting the maximum surface settlement caused by tunneling显示文摘 | Pourtaghi A Lotfollahi Y M A | 2012 | Tunneling and Underground Space Technology2012，，28： | 1 |
| 20 | On the characteristics ofnew ductile knee bracing systems显示文摘 | Massood M Lotfollahi M | 2006 | Journal ofConstructional Steel Research2006，62，： | 1 |
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