Linear dynamics are virtually always assumed when designing optimal controllers for wave energy converters (WECs), motivated by both their simplicity and computational convenience. Nevertheless, unlike traditional tracking control applications, the assumptions under which linearization of WEC models is performed challenged energy-maximizing controller itself, intrinsically enhances device motio...

Optimal wave energy control is noncausal as the command optimized based on incoming force. Therefore, implementation of requires forecasting future A real-time latching algorithm short-term force prediction developed in this study to tackle such noncausality. The forces are forecasted using a gray model. receding horizon strategy used optimize online, over interval. Based predicted forces, powe...

Abstract. Floating wind turbines rely on feedback-only control strategies to mitigate the negative effects of wave excitation. Improved power generation and lower fatigue loads can be achieved by including information about incoming waves in turbine controller. In this paper, a wave-feedforward strategy is developed implemented 10 MW floating turbine. A linear model established utilized underst...

A Lamb wave-based crack detection method for aluminum plates health monitoring is developed in this paper. Piezoelectric disks are employed to actuate and capture the Lamb wave signals. The position of crack is assumed to be aligned with the sensor and actuator.  Extraction of high quality experimental results of lamb wave propagation in a plate-like structure is considerably complicated due to...

Institutional collaborative systems focus on providing the fast, and secure connections to students, teaching and non-teaching staff members. Access control is more important in these types of systems because different kind of users access the system on different levels. So a proper architecture must be there for these kinds of systems, for providing an efficient and secure system. As lot of wo...

The traditional manual way of thesis management is increasingly satisfying the demand of thesis guidance and administrative management in the information age. To improve the traditional manual undergraduate thesis writing, guidance and administrative management process in Southwest University of China, a Role-based access control (RBAC) Workflow model for thesis management is developed. In the ...

Delegation in access control takes place in the presence of an access control model, when a user is unable to perform their administratively assigned permissions. In this paper, we discuss the meanings of the word “delegation” found in the literature, focusing on its use in access control. In the context of a rolebased access control model, we survey many possible ways in which delegation can b...

A dynamic positioning (DP) system includes different control functions for the automatic positioning and guidance of marine vessels by means of thruster and propeller actions. This paper describes the control functions which provide station-keeping and tracking. The DP controller is a model-based control design, where a new modified LQG feedback controller and a model reference feedforward cont...