The advantage of using the lookup function of System dynamics is that it
can express an unusual distribution. By implementing the average and
variance of the daily failure probability during the total life of the
failure functions as a system dynamics model, the occurrence of failures
during the total life can be simulated. Fig.3(a) and (b) are the average
of daily normal / critical failure function, respectively.
Modules
were constructed as shown in Fig. 4 using the mean and variance of the
estimated failure functions. The two failure functions and variance are
implemented, and the input/output relationship is briefly shown. The
physics at this stage is a number of malfunctioning spare parts or
equipment. Both failure functions have the same scale. Critical failure
should be classified into physics different from normal failure because
it is repaired by arriving at the port immediately after failure.
Critical failure and normal failure are separated through integration
with other modules (section 4).