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Lecture series

The VTT, Aalto University, University of Michigan

The Latest Technology and Innovations in the Maritime Industry

Lecture series for experts, professors and industry leaders in the maritime sector 

Machine Learning Framework

To Model Extreme Events for Nonlinear Marine Dynamics

Date: October 9th 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Kevin Maki
Email: kjmaki (at) umich.edu
Link to Bio

About the Lecture

Extreme events such as large motions and loads on marine systems can result in damage to the device or loss of life. In this talk, the prediction of extreme events is described and addressed from a machine-learning perspective. The novel framework uses high-fidelity computational fluid dynamics for learning, and is demonstrated on various nonlinear ship dynamics problems.

Ship Wave loads

And dynamic response – Some recent developments

Date: October 14th, 2020,  MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Spyros Hirdaris
Email: spyros.Hirdaris (at) aalto.fi
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About the Lecture
In recent years, the software, engineering and computer hardware technology available to predict ship design loads while accounting for hydrodynamic actions improved dramatically. With the stepwise increase in size and structural complexity and the advances of Rules and Standards it is becoming increasingly possible to utilize state of the art multi-physics methods for the assessment of both intact and accidental limit states. This lecture will present recent research work on fluid structure interaction methods for the prediction of wave induced and accidental loads on modern container ships and passenger vessels.

Design and Manufacture

Of Multi-Materials Lightweight Structures

Date: OCTOBER 16TH, 2020,  MI, USA 08:00 EDT; HELSINKI, FI 15:00 HRS EEST

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Lecturer: Pingsha Dong
Email: dongp (at) umich.edu
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About the Lecture

A number of recent major investigations in the US and aboard  have concluded that the most effective lightweighting can be achieved through the adoption of multi-materials structures for which the right material can be used at the right place. However, the design and manufacture of such multi-materials structures faces unprecedented challenges that include design for producibility, jointability, and structural performance.  This talk will highlight some of the key research issues and some solutions being developed at University of Michigan.

Ice Loading

On ships-comparisons of full-scale data with numerical models

Date: October 21st, 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Pentti Kujala
Email: pentti.Kujala (at) aalto.fi
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About the Lecture

Natural disaster management requires risk management and assessment, limiting negative events, making timely and informed decisions and optimizing the use of resources – Climate change is expected to cause rapid changes in sea ice conditions and, at the same time, the new sustainability requirements increase the shipping  in icy waters to shorten the transport distances. The current experience-based determination of ice-induced loads on ships, primarily deriving from historical data, are not valid any more. New approaches are urgently needed, based on accurate experimental data in real ice conditions and an in-depth understanding of the physics in the ship-ice interaction. The lecture will summarize the present current  best practices in this research topic.

Analyzing

and Managing

The risks and safety of new smart ship concepts

Date: October 28th 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Osiris Valdez Banda
Email: osiris.valdez.banda (at) aalto.fi
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About the Lecture
In this lecture, the participants get to know and understand the existing methods for hazard and risk analysis implemented in the analysis of complex maritime sociotechnical systems utilized in the constitution of smart/ autonomous ship concepts. The International Maritime Organization (IMO) set the level of safety for autonomous ships to be “at least as safe as conventional ships”. This represents a major challenge as the experience of autonomous ships is very limited. In the lecture, applications for systemic and systematic hazard analyses at the earliest design phase of smart/ autonomous ship systems and concepts are presented. This enables a comparison of the characteristics and capability of tradition vs advance methods for maritime hazard and risk analysis.

Short Design Cycles

Trough FEA-based optimization of advanced marine structures

Date: October 30th, 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Jani Romanoff
Email: jani.romanoff (at) aalto.fi
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About the lecture

In this lecture a methodology based on Finite Element Analysis and Particle Swarm Optimization algorithm is presented which allows rapid and accurate design of advanced marine structures. The methodology is based on Equivalent Single Layer theory originally developed for composites and later to the traditional stiffened panels and most recently extended to lattice materials and structures. This generality of the approach allows exploration of the design space effectively and accurately for wide range of material and geometrical combinations. The approach is currently used in companies in marine and civil engineering and developed further in Aalto University together with its research partners.  

Fatigue Design

Of high-performing ship structures

Date: November 4th, 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Heikki Remes
Email: heikki.remes (at) aalto.fi
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About the Lecture
The significant improvement in welding and production quality during the last decade enables the production of advanced high-performing marine structures. These structures utilize new steel grades, thinner plates, and best possible topologies to reduce the steel weight. The production with high precision and quality increases the fatigue strength of welded joints considerably. The robust design of the high-performing structures requires fundamental improvement in the fatigue design methodology. This lecture summarizes the present best practices and recent developments with illustrative example cases.

Integrated Power Systems

For Electrified Ships: Real-time Control and Optimization

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Date: November 6th 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

Lecturer: Jing Sun
Email: jingsun (at) umich.edu
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About the Lecture

Electrification is a major trend for both military and commercial ships, bringing in enormous opportunities for energy saving, environmental protection, and mission expansion.   Integrated power systems (IPS) have been a critical enabling technology for vehicle electrification, particularly for all-electric ships. In this presentation, we will explore the special characteristics of the IPS and discuss the challenges and solutions from the perspectives of control and real-time decision making.

Recent hydrodynamics

Developments at VTT – Effective Wake Modelling in Off-Design, Propeller Cavitation and Underwater Noise

Date: November 13th 2020, MI, USA 08:00 EDT; Helsinki, FI 15:00 hrs EEST

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Lecturer: Antonio Sanchez-Caja and Ville Viitanen

About the Lecture

One of the most important information the propeller designer needs for a successful outcome is the knowledge of the effective wake at the propeller location. The effective wake is the velocity field without the propeller induced velocities, but including the flow interactions between propeller and hull (e.g. modification of the wave field, reduction of boundary layer, etc.), which are not easily evaluated. Typically, errors of 2-5 percent in the estimation of the effective wake could lead to errors of 5-14 percent in the estimation of force coefficients for usual propeller loadings. A new procedure has been developed at VTT that allows the accurate prediction of the effective wake. The procedure can be applied even to oblique flow conditions, which is not usually treated by current approaches, and allows accurate ship manoeuvre simulation.

Cavitation occurs in propellers in different forms. Some types like bubble cavitation display clear separation boundaries between the liquid and gas phases, some others like cloud cavitation appears in the form of a mixture of liquid and gas. Homogeneous and inhomogeneous numerical models have been developed for simulating such types of cavitation. For cavitation analyses, VTT has utilized the general-purpose viscous flow solvers FINFLO and OpenFOAM. Some recent simulations with homogeneous cavitation models and recent developments in these solvers will be presented. Application examples include static hydrofoils and propellers in different configurations. As examples, cavitation collapse induced pressure waves and sheet cavitation dynamics are investigated. In addition, we recently showed that the Reynolds number can have an impact on the predicted propeller cavitation patterns: the cavitation extent can be greater in full-scale conditions.

We employ a two-step hybrid approach for the propeller noise simulations. Unsteady RANS and DDES approaches are used to obtain a transient solution of the propeller flow and wake dynamics, and an acoustic Lighthill analogy is applied in the FEM context to simulate the propeller-induced acoustic propagation. Results will be demonstrated for a propeller operating in a cavitation tunnel.

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Megan Williams
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Ulla Lainio
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