manufacture and erection the customer may have

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Unformatted text preview: orbtion of dynamic influences. - Manufacture and erection The customer may have specific demands about the manufacture of components and the assembling of sub-systems. The applied materials and painting system as well as the preferred electrical sub-systems should be described as well. Special attention must be given to the erection of large equipment. Erection method, preferred support equipment, maximum area for the erection site etc. are of importance. - Maintenance demands Lay-out of machinery rooms, accessibility to components, selection of components, lifetime and performance of sub-systems etc. should be described. If a minimum maintenance-free operating period (e.g. 1000 operating hours) is required, this must be indicated. Ad c Economic requirements A systems analysis may have learned that a specific balance between technical functionality and economic requirements should be met. Some examples are listed below: - Equipment lifetime The longer a required lifetime, the more important is the resistance for fatique loads, properly designed drive systems, quality of manufacture and a proper surface protection (painting). These aspects also positively influence the residual value at the end of the economic lifetime and thus the yearly deprecations. 3 - - - - Potential for future capacity expansion Already built-in provisions for a future increase of performance or adaptation to new technological developments may contribute to an extended feasible lifetime. Sensitivity to handle various products (services) Flexibility to perform under changing operational circumstances helps in maintaining the projected economic lifetime even when the operating conditions for the equipment have changed. Energy consumption, durability Drive-line concepts (electric, hydro-static, diesel etc.) determine the resulting fuel demand. A high drive-line efficiency and a direct electrical supply system will be beneficial to control energy consumption. The application of recyclable and durable materials is of increasing importance. Overall operating cost These are determined by the yearly fixed cost (depreciation, capital interest, inspection cost, insurance, painting) and the variable cost per operating hour (energy, maintenance, spare parts, lubrication, labour cost, tires, wire ropes, tools etc.). In many cases more expensive quality products result in lower yearly total operation cost, due to a higher availability/performance and lower variable cost (less maintenance, less break-downs). Ad d Optimisation of the concept After finishing the first three major design requirement area’s some first design concepts can be realised and assessed (analysed) on their fulfilment of functional, structural and economic requirements. After that an essential activity should be made: the optimisation of the concept(s) covering the following elements: - Test the fulfilment of the user’s philosophy. The user may have various goals such as * striving for the lowest initial investment; * looking for the lowest overall life cycle cost; * the equipment must show the lowest environmental pollution; * the equipment must have maximum flexibility to operate with the materials under other conditions; * the equipment must be maximally dedicated to the operator’s requirements (comfort, control, accessibility); * the equipment must allow a gradual automation in the future; * the equipment must have a modern, good looking shape resulting in a maximum appe...
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This note was uploaded on 06/06/2010 for the course FF wb3094 taught by Professor Loderwy during the Spring '10 term at Renmin University of China.

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