The project serves the safe and environmentally friendly operation of (semi) planing crafts. The issue of safety is determined by the sporadic occurrence of unstable behaviour: the so-called porpoising (pitching or trimming motion) and corkscrewing behaviour with rolling motions. These phenomena significantly impair the safety of people and the ship and, last but not least, pose a threat to the mission objectives also due to time delays and additional fuel consumption.
|Title:||Automatic Navigation Assistance System for Plan-ing and Semi-planing Crafts
SVA: Evaluation of thrust measurements on planing boats
|Term:||10/2019 – 09/2022|
|Project Manager:||T. Nietzschmann (Kay Domke)|
|Founding:||Federal Ministry for Economic Affairs and Energy|
|Project administration:||Project Management Jülich|
|Partners:||Friendship, TU Berlin, Shipyard UZMAR (Kocaeli)|
The goal is pursued in a holistic approach:
A. Model tests and numerical calculations to understand the unstable behaviour and its causes.
B. Shape optimization strategies aimed at minimising the probability of unstable behaviour occurring.
C. Especially from A), possibilities and methods are derived to be able to make predictions about the unstable behavior in real operation, and to avoid it by changes to the driving regime
In addition to extensive model tests with novel measurement tasks, numerical calculations are used to gain knowledge and adapt optimisation strategies. The model tests and calculations are validated on the basis of full-scale measurements. The key point here is the novelty of thrust measurements on the ship’s propeller in the full-scale trials and the prognostic intervention in the driving regime, based on measurements of the operating conditions.
The objectives of the subproject of SVA Potsdam are:
• Development, design and construction of rudder force balances for small models.
• Integration of a model test setup for propulsion tests with free rolling motions.
• Design of a propeller geometry for the planning boatand manufacturing of the ship models and the propeller models.
• Development and provision of a measuring system to record the instationary pressure distribution on the ship hull of the model and the full-scale model. Especially for the optimization of the data analysis the test setup shall be as flexible as possible and buildt up as a mobile test setup.
• Development, design, manufacturing and commissioning of a measuring element for the registration of propeller thrust and torque in the full-scale version. This construction has to be adapted to the conditions in the prototype.
• Cavitation observations in ship operation in correlation to thrust measurement.
• Merging of the measurement data on propulsors, motion behaviour and pressure.