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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
- 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
- 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
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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.
- Spring '10