This page contains a Flash digital edition of a book.
Trans RINA, Vol 156, Part C1, Intl J Marine Design, Jan –Dec 2014


strict stock control system in order to try and control cost. A fitter required a new drill bit with a value of £1.68. By the time he had walked to stores, waited to be served and walked back to continue the job 45 minutes had expired. At a labour charge out rate of £40 per hour this drill cost £31.68. The same is applicable for the tools and consumables. By the standardization of the tools and fasteners ABC stock controls can be used [5, 6, 8 & 27]. As shown by figure 5.4(e). This categorizes part value by the quantity also known as the 80/20 rule. This states that 80% of the value is in 20% of the products as shown by ‘A’. The area designated by C is the lower value and higher volume components and these should be issued to line side since they are the items likely to stop production and consume time as found with the drill example. With the standardization and reduction of parts at the design stage will reduce the stock holding further.


The benefit of modularity and flat pack is that the complete assembly can be kitted and delivered line side by the supplier with everything required for the install hence reducing travelling time and dead time. This simple production technique is used throughout industry and a major objective when designing for manufacture and must not be overlooked. Control of this can be achieved on the CAD by limiting the number of parts that can be used during the design. Since few discrete parts are used but in higher volume there is also a benefit of economies of scale and lower procurement overhead.


5.5 FIRST CUT DESIGN CONCEPT STEP3


One of the problems with interior layout on a 2D general arrangement is the visualization for both the designer and the customer. By the use of Hi resolution rendering, walk through and virtual reality capabilities the stake holders can soon appreciate the merits and failings of the design.


Ordinarily this level


visualization would only be available once fit out has begun or completed. Changes at this


stage are


expensive to improve and normally leave the owner disappointed since the design has not met their expectations. As has been the theme throughout this paper clear specification and working with the demands of the customer will save confusion and cost during build and bring the project on time and cost.


Once the concepts have been approved by the customer work can begin on the detailed layout. In all


the


concepts ergonomics and latest habitation regulations will be included in the designs.


An additional benefit of this 1st cut concept is that the customer uses the images and layouts for their own marketing purposes, communicating the charter advantage and differential advantage to their own customers with success. Presentation of these images has a psychological effect to the viewer and portray a


professional approach that


project. Again customers and stake expectations will be met or exceeded.


reflects on the whole holder’s


Figure 5.5 KPM designed modular interior courtesy MMS Ltd


5.6 DETAIL CONCEPT AND FROZEN BOM STEPS 4 AND 5


Once the 1st cut design concept has been undertaken and has satisfied the information gained from the strategic and competitive advantage


research the


concept and BOM needs to be frozen and signed off by the stake holders. Detail design modelling is the stage at which the engineering detail


is produced. As a


general rule this accounts for about 50% of the design time, but 80% of the final build cost of the vessel. The design should cover the following;


of


• Full


ergonomic


analysis


and simulation


including access, seasickness. Ergonomic simulations using percentile dummies that account for differences in racial sizes and weights. • A full HVAC analysis with air recirculation calculations for northern; and tropical conditions.


• Acoustics and residual noise elimination or suppression. Analysis of attenuation points.


• Design for manufacture and efficient use of materials


• Assembly time based upon time and motion and assembly database.


• Build and BOM reduction


flow and southern


C-132


©2014: The Royal Institution of Naval Architects


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