Workforce, Inventory and Oscillation model from Vensim user guide.

From Jay Forrester' Principles of Systems

From Jay Forrester' Principles of Systems

Workforce and Inventory model

Supply Demand Inventory Modle

It is a Balanced Loop Model of Production. Production is driven by the gap between  Target Inventory and Inventory as well as orders.

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

A demonstration of a simple min/max inventory system

It is a simple model to show how different parameters like inventory adjustment time and delay in ordering affect the inventory replenishment system. User can change values of all the parameters.

This model assumes Sales are constant and used to calculate the number of items on orders

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Replenishment model with Consumption and Lead Time variability.

This model uses Step function

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Workforce and Inventory model

Models the behaviour of ​Blood Bank and Hospital blood inventories in response to a step change in the demand for transfusions.  Delays can be set for the delivery of blood to the hospitals and for the response of donors to a request for more blood.

Models the behaviour of ​Blood Bank and Hospital blood inventories in response to a step change in the demand for transfusions.  Delays can be set for the delivery of blood to the hospitals and for the response of donors to a request for more blood.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This model using Ramp function