Simulation in the Dairy Industry
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Simulation in the Dairy Industry - a case stud5 using SIMUL8
Christine Campbell and Norman Thomson increasingly perceived asíi mattel of some irritation
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voiiielIiiigï a/C/fl to 1/ir power of ¡aigrI products, oiily (lt nfl
A modelling scenario
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It takes appreciable time to observe and uriderstaiid by qtleStioning and discussion the workings of any large company. In the present case, the ccmpany's products are highly perislmble, and a significant part of the core operatioti consists of the movements of a variety of vehicles performing different functions with intensities varying on both a daily and a weekly
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Current barriers to simulation
cycle. For simulation prlqoses, an essential step following the initial observation period was to abstract a skeletal process description such a the
l'Ian pages have been written in the Operational Research and other journals extolling the merits of simulation, and deploring the absence of its wider use in industry and commerce as a whole. Much of the reason for this can be attributed to the hesitation of companies to pay large sums to invest in software which, at the least, requires skills to operate beyond those likely to be found within company resources,
following which served as the basis Ihr sUbsedluent modelling arid experimentation.
Milk is delivered to the dairy each day by two different methods. The first method is by the company's own tankers who collect milk from farms with which the company has a supply contract. This amount fluctuates broadly with the time of year, but very little ni a day by day basis. The second source
and over which there is bound to be doubt as to whether
the
investment
can
be
recouped.
Currently, most of the twenty or so simulation packages available in the market-place can be installed on desktop computers, yet companies
is by deliveries from an external company, the nature of which are determined by a monthly
selling into the simulation market are still organised to sell individually through high-cost sales people. \Vhile price is riot the only issue of concern, it is
contract. The ratio of milk supplied from these two sources is about 5:7. In addition, the dairy acts as a buffer, sometimes calling for milk from other dairies, and at other times sending them excess milk.
undoubtedly an important factor which must be addressed if knowledge
is
to
be
spread and
momentum created in this sphere. Readers of the Operational Society Newsletter may already have
There are four different sizes of tankers of capacities 9,000 litres, 14,700 lit
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