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Thruster Controls and Automation
Published in Surender Kumar, Dynamic Positioning for Engineers, 2020
Wärtsilä propulsion products used in the offshore/marine market are available in the following brand names: Wärtsilä EnergoFlow – propellers.Wärtsilä EnergoProFin – propellers.Built-UP – propellers.Wärtsilä – propellers for coastal and inland waterways.Wärtsilä – fixed pitch propellers.Wärtsilä – controllable pitch propeller systems.Wärtsilä – transverse thrusters.Wärtsilä – underwater mountable thrusters.Wärtsilä – retractable thrusters.Wärtsilä – steerable thrusters.Wärtsilä – modular and midsize waterjets.
Interacting with technology
Published in Michelle Rita Grech, Tim John Horberry, Thomas Koester, HUMAN FACTORS in the MARITIME DOMAIN, 2019
Michelle Rita Grech, Tim John Horberry, Thomas Koester
A critical factor is that warnings must provide understandable information needed for crew to make informed decisions that produce the correct response. There are many examples where shortfalls in onboard alarm systems led to accidents. One such example is the Aquitaine passenger ferry accident. In essence, the ferry collided with the berth due to a fault in the controllable pitch propeller (CPP). One of the contributory factors leading to this accident was shortfalls in the provision of an adequate warning system, which resulted in the engineers’ inability to detect the fault in the shaft-driven pump of the faulty port CPP system. Had there been adequate warnings designed within the system, the engineers may have been alerted to the fact and corrective action taken in time. This accident is mentioned again in Chapter 7.
Safe maneuvering in adverse weather conditions
Published in Pentti Kujala, Liangliang Lu, Marine Design XIII, 2018
S. Krüger, H. Billerbeck, A. Lübcke
Propeller forces are obtained from lifting line calculations. This includes computations in oblique inflow to include the propeller cross forces and the alterations of thrust and torque. These calculations include alterations of the propeller blade angle if the propeller is a controllable pitch propeller. Rudder forces are computed by a direct panel method by Söding (Söding 1998) where the rudder inflow comes from a lifting line theory. Fig. 4 shows the propeller/rudder model of example ship 1 for zero degree rudder angle and design load.
Physical, data-driven and hybrid approaches to model engine exhaust gas temperatures in operational conditions
Published in Ships and Offshore Structures, 2021
Andrea Coraddu, Luca Oneto, Francesca Cipollini, Miltos Kalikatzarakis, Gert-Jan Meijn, Rinze Geertsma
The case study Holland Class Oceangoing Patrol Vessels, shown in Figure 1, are naval vessels that can perform various security operations, such as counter terrorism, counter piracy, counter drug transport, disaster relief and coastguard operations. The small crew of 50 people requires a high degree of automation (Geertsma et al. 2013), but nevertheless maintenance load is high for the crew and needs to be reduced Horenberg and Melaet (2013). Reducing the maintenance burden on DEs using predictive maintenance based on its current sensor fit can contribute to this. The propulsion system of the vessel consists of two shafts with Controllable Pitch Propellers (CPP), a gearbox, and one DE per shaft, as shown in Figure 2. This configuration is typical for multi-function ships that require silent, maneuverable, highly reliable and low emission propulsion.
Optimization procedures for a twin controllable pitch propeller of a ROPAX ship at minimum fuel consumption
Published in Journal of Marine Engineering & Technology, 2023
M. Tadros, M. Ventura, C. Guedes Soares
The ship propulsor, which is the focus of this paper, is an essential part of improving the wakefield, increasing propeller efficiency and reducing fuel consumption, thus reducing cavitation problems and the issues of noise and vibrations to ensure the safety and sustainability of the ship (Carlton 2012). Two types of propellers are commonly used, fixed pitch propeller (FPP) and controllable pitch propeller (CPP).