Experimental Study of Nonlinear Moored-Buoy Responses Objectives : • To Identify and Classify Highly Nonlinear Experimental Structural Responses Under Combined Deterministic and Random Waves • To Validate Analytical Model Predictions and Investigate Fluid-Structure Interactions Principal Investigator : • Prof. Solomon C.S. Yim Civil Engineering Department Oregon State University Approach : • Modifying Existing ID Techniques and/or Developing New Tools to Classify Degree of Nonlinearity • Comparing Overall Behaviors of Experimental Data and Simulations to Validate Analytical Model • Conducting Sensitivity Study Experimental Configuration (SDOF)
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Experimental Study of Nonlinear Moored-Buoy Responses
Experimental Study of Nonlinear Moored-Buoy Responses. Objectives : To Identify and Classify Highly Nonlinear Experimental Structural Responses Under Combined Deterministic and Random Waves To Validate Analytical Model Predictions and Investigate Fluid-Structure Interactions. - PowerPoint PPT Presentation
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Experimental Study of Nonlinear Moored-Buoy Responses
Objectives:• To Identify and Classify Highly
Nonlinear Experimental Structural Responses Under Combined Deterministic and Random Waves
• To Validate Analytical Model Predictions and Investigate Fluid-Structure Interactions
Principal Investigator:• Prof. Solomon C.S. Yim
Civil Engineering Department Oregon State University
Approach: • Modifying Existing ID Techniques and/or
Developing New Tools to Classify Degree of Nonlinearity
• Comparing Overall Behaviors of Experimental Data and Simulations to Validate Analytical Model
• Conducting Sensitivity Study to examine Hydrodynamic Properties
Fig 8. Time series of narrowband excitation amplitude (top) and corresponding response amplitude (bottom)
Fig 9. Amplitude response map correspond to time series shown in Fig 8.
Stochastic Analysis of Nonlinear System under Narrowband Excitation
Modeling and Validation of Nonlinear Stochastic Barge Motions
Modeling and Validation of Nonlinear Stochastic Barge Motions
Objectives: - To examine predictive capability of coupled Roll-Heave-Sway models to estimate stochastic properties of nonlinear barge response behavior - To develop probability-based analysis and design methodology
FIG. 1. Roll-Heave-Sway Model
Approach: - Develop Roll-Heave-Sway barge-motion models (and lower order ones) - Identify system coefficients - Examine and compare numerical predictions with measured data - Develop nonlinear extreme-value prediction techniques
Principal Investigator:- Prof. Solomon C.S. Yim Civil Engineering Department Oregon State University
Identification of System Coefficients for Roll-Heave Model - Regular Waves
Comparison of Model Predictions with Measured Data - Measured Random Waves - Simulated Random Waves
Modeling and Validation of Nonlinear Stochastic Barge Motions
FIG. 1. Roll vs Roll Velocity (Regular Waves, Case SB27)
measured predicted
FIG. 2. Roll vs Heave (Regular Waves, Case SB27)
measured predictedFuture Research:- Examine complex nonlinear behavior including resonance and possible chaos - Perform and compare simulations- Use model to verify proposed theories on capsize