prof. dr hab. inż. Wojciech Litwin | Politechnika Gdańska

The ecological aspects of the lubrication of stern tube bearings on ships represent a critical challenge today. Oil leakages are a typical issue, even for new systems, similarly to water ingress from the environment. One of the options for improving environmental protection is replacing mineral oil with an environmentally adaptable lubricant (EAL). This paper reports experimental investigations of the effect of water content in...

Increasingly stringent requirements for the durability and reliability of ship components and new standards for environmental protection have resulted in the use of increasingly sophisticated technologies in the shipbuilding industry. The components of a ship’s propulsion system have been meticulously analysed and improved over several decades. The durability and reliability of the sliding bearings for a ship’s propeller shaft...

Computing the power required to meet a ship’s operational needs is one of the most important tasks in naval design. The power required to propel a vessel is directly related to the resistance the hull experiences as it moves through the water. The conventional method of determining a ship’s resistance involves towing tank tests of ship models at a fixed speed; however, for short-range vessels, where constant speed is not the primary...

The stern tube or strat bearings are key important component for safety of shipping. Modern global regulations required a low as possible negative impact on environment including lubricants leaking to the sea. The ship owners are looking for reliable and durable solutions. The costs of each ship components are carefully studied. The water lubricated bearings for ship propeller shafts are an environmentally friendly solution. That...

The aim of this study was to assess the feasibility of creating a prototype of a self-sufficient houseboat that is capable of prolonged independence from power grids and freshwater sources. In this design, electricity demand is met by a photovoltaic installation, and the energy is stored in batteries. Fresh water for living needs may be obtained from many sources, depending on the environmental conditions, such as through purifying...