Hardware in the loop experiments on the interaction between a diesel-mechanical propulsion system and a ventilating propeller

The interaction between ship propulsion machinery, propellers and the highly dynamic environment which is the sea is a complex yet highly relevant subject. During a storm, for example, waves and ship motions may cause the propeller to draw air, or ventilate, resulting in rapid changes in propeller thrust and load torque. These fluctuations...

Hardware in the Loop Emulation of Ship Propulsion Systems at Model Scale

Requirements on ships are rapidly increasing. In particular, safety and environmental impact are under increasing scrutiny. At the same time, cost and profitability remain as important as they have ever been. These increasingly stringent constraints are beginning to pose problems during the design process. For example, the energy efficiency...

Hardware in the loop experiments with ship propulsion systems in the towing tank: Scale effects, corrections and demonstration

Standards for environmental impact, safety and operational performance of ships are becoming increasingly strict. In order to meet these standards, the performance of new ship designs must be predicted with an increasing level of detail and confidence. As present prediction methods lack realistic, dynamic behaviour of the ship's propulsion plant...

Verification and validation of full-scale propulsion analysis using CFD

An accurate prediction of propeller hull interaction is an important step in the design of a new vessel. The prediction of full-scale flow phenomena, which eliminates scale effects, is becoming available due to increasing computational power. However, the complexity of full-scale CFD calculations combined<br/>with a lack of validation data...

Model Predictive Control of Open Water Systems with Mobile Operators

In this master thesis, the recently introduced Mobile Model Predictive Control (MoMPC) approach for open water systems with uncertain dynamics is discussed, where there are no sensors or actuators installed in the system that would allow for a fully automatic operation. MoMPC is a configuration of Model Predictive Control (MPC) that explicitly...

Evaluation of three energy balance-based evaporation models for estimating monthly evaporation for five lakes using derived heat storage changes from a hysteresis model

The heat storage changes (Qt) can be a significant component of the energy balance in lakes, and it is important to account for Qt for reasonable estimation of evaporation at monthly and finer timescales if the energy balance-based evaporation models are used. However, Qt has been often neglected in many studies due to the lack of required water...

Model predictive control on open water systems

Human life depends on water daily, especially for drinking and food production. Also, human life needs to be protected against excess of water caused by heavy precipitation and floods. People have formed water management organizations to guarantee these necessities of life for communities. These organizations manage a water system within the...