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Unformatted text preview: .KL to .JK (see Figure 4.8). Both maufacturing and delivery rates are variable. Let us assume that we have control over the manufacturing rate but that demand is outside our control (we are attributing no importance to marketing and sales). According to our diagram in Figure 4.5, manufacturing rate is influenced by stock level, so if stock level falls below a desired level, manufacturing rate will rise. We will assume that an indicator on demand ( DI ) can be derived from stock level and desired stock level ( DSL ) which is a constant DI.K = DSL - SL.K (4.5) Manufacturing rate can therefore be expressed in the following way Figure 4.8 How time notations are worked out for system dynamics models < previous page page_72 next page >...
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- Spring '11