Concern for the structural assessment of ship and offshore structures during operations, including unmanned operations. The focus shall be on methodologies translating monitoring and inspection data into operational and life-cycle management advice, with associated criteria for decision making. This shall include diagnosis and prognosis of structural health, prevention of structural degradation and failures, and structural renewal and reuse. The research and development in passive, latent and active systems including their sensors and actuators shall be addressed. Special attention is to be given to structural digital twin technology and methods including reduced order analysis, inverse modelling, and AI technology application, combined with the use of monitoring systems and inspection data, to provide real-time advice for safe operation during the structural life-cycle.
Calculating directly the inner and outer approximation of the image of a set by a function can be challenging. Then, it is sometimes preferred to compute the image of the boundary of the set instead. However, boundary-based methods are subject to the apparition of fake boundaries in the image set. These fake boundaries add pessimism when characterizing the inner approximation of the image set. This paper then introduces the notion of Box Chains to simplify the detection and the suppression of the fake boundaries. The characterization of the inner and outer approximation of the image set in the case of a function from the unit disk D to R2 will be considered, with two examples.
Structural adhesive bonding is being increasingly used for civil engineering applications (externally bonded reinforcement, bonded fasteners, etc…). Yet, some issues remain regarding the assessment of the durability of such assemblies, particularly with regard to creep. For the case of adhesively bonded joints, creep can be affected by the type of polymer and its behaviour, the stress state and level, the temperature, but also by the interfaces and the thickness of the joint that has a direct influence on its mechanical properties.In this study, in order to take into account those different effects, the Arcan test was used to conduct experimental investigations with dedicated testing resources. The creep behaviour of a chosen adhesive joint was investigated and the influence of several parameters was studied: load level, type of load, and temperature. The adhesive thickness and surface preparation were kept constant. The three characteristic creep stages could be identified. The experimental investigations also enabled us to describe the creep behaviour of the adhesive joint in tension and shear during the first two stages using the Burger creep model.
This paper presents an efficient online method to simulate a dynamical system with interval uncertainties. These uncertainties can be either on the initial state vector, on the time-dependent inputs, or on the evolution function. Compared to other techniques used for the guaranteed integration of differential inclusion, the presented approach is online and requires a small and fixed number of operations at each sampling time. An illustration related to underwater robotics will be provided. The application involves a robot with a ballast that can move from the surface to the sea floor. We would like to guarantee that the robot will reach a given depth at a given time.
