By D Gray, A. J. S. Bennett
Centralized and automated Controls in Ships offer a non-mathematical uncomplicated advent to the topic of keep an eye on engineering utilized within the marine box. This booklet consists of 20 chapters that disguise the fundamental ideas of the apparatus in ships.
The commencing chapters care for send elements, development, and commissioning regimen for definite automatic plant. the following chapters examine the elemental ideas of automated keep an eye on and controllers. those themes are through discussions on common sense devices and knowledge processing apparatus, different keep watch over components, steam generators, and diesel engines. different chapters illustrate the appliance of keep watch over strategies to the main parts of the ship’s equipment. the ultimate chapters learn send and ship’s keep an eye on process commissioning and upkeep.
This ebook is a useful resource for marine engineers and marine engineering scholars.
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Additional resources for Centralized and Automatic Controls in Ships
Example text
Xii) The acquisition of accurate operational data permits better performance analysis for current and future maintenance and provides a firm basis for studying future machinery design. A diagram of a typical data logging system is shown in Fig. 2. The sensing/transducing devices, which must provide an electrical output, are connected to a scanning system whose function is to switch each line in turn to a common channel for transmission to the next sub unit. The rate of scanning could be as high as 50 points/second but for marine systems scanning speeds of about 1 point/second are commonly used.
The movement continues until a position is reached where the diaphragm force and the spring force are in equilibrium. As the relation between spring thrust and movement is linear, the valve travel is related linearly to the controller output. The extreme bottom position is reached when 15 psi is applied to the diaphragm. The size of the unit is determined according to : (i) valve stroke, (ii) operating force required. Fortunately, both functions are usually tied to the nominal size of the valve so that the variation is generally compatible.
Solid state devices (see Chapters 8 and 11) are used wherever practicable to ensure reliability and the modules are encapsulated to give protection from the normal marine conditions of vibration, salt, moisture and/or oil-laden atmospheres. This encapsulation does not normally involve "potting" but rather the coating of the module complete with components with a layer of epoxy resin material, polyurethane or equally effective material. ■· ■■■ l l - 1 1 finter] I I ^r ''JOÊÊÊTC R^4*B Modular construct ion I FIG.