Abstract
The requirements for the foundations of naval vessel engines are based on classification rules devised by classification societies or/and military standardization rules. A class guideline was published, defining the requirements, acceptance criteria and machinery seating methods. There is also a schedule of basic calculation procedures for cast resin or rubber chocks which facilitates the process of machinery foundation design, preloading force calculation, the establishment of boundary conditions etc. In case of naval vessels, typical procedures do not meet tactical requirements due to potential explosion loads. Since minehunters are mainly deployed at sea, handling active, naval mines, the shock resistance calculation for the entire machinery, including the Genset, is required. The paper presents preliminary MatLab calculation methods which can be used to analyse the type, number and location of rubber or elastomer chocks. The procedure consists of input data such as UNDEX pressure and technical data of the Genset used in the Polish Navy. Calculation results include the analysis of the dynamic interaction between the Genset and the foundation, as well as the damping effect generated by the UNDEX (UNDerwater EXplosion) shock pulse.
Highlights
The foundations of machines and engines on naval ships have been designed in accordance with the regulations of marine classification societies and military standardization
The basic requirements for main engine foundations include the following parameters: seating structure thickness, minimum mating surface of cast resin chocks, preloading force exerted on a foundation bolt, tightening torque of foundation bolt, tensile stress depending on the thread root diameter of the foundation bolt on the basis of preloading force, etc
The paper presents a preliminary simulation of a GenSet foundation with introduced new load element i.e. the impact of underwater explosion (UNDEX) shock pulse
Summary
The foundations of machines and engines on naval ships have been designed in accordance with the regulations of marine classification societies and military standardization. The main differences between the machine foundations on commercial vessels and navy ships are the ability to absorb energy from UNDEX (underwater explosion) and hydroacoustic signature reduction by noise and vibration damping. The basic requirements for main engine foundations include the following parameters: seating structure thickness, minimum mating surface of cast resin chocks, preloading force exerted on a foundation bolt, tightening torque of foundation bolt, tensile stress depending on the thread root diameter of the foundation bolt on the basis of preloading force, etc. Andrzej Grządziela and Marcin Kluczyk: Preliminary Calculations for Minehunter's Genset Foundations the distance from the detonation epicentre is four times greater than the diameter of the first gas bubble, which is a realistic scenario for minehunter operations. Robert Cole (Cole, 1948) described it with the following formula for TNT:
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