Abstract
This chapter covers methods of describing a system using block diagrams, a clear and detailed block diagram “language,” some examples of other block diagramming “dialects,” and finally some methods for analyzing system behavior using block diagrams. Block diagrams provide two major benefits to the control system engineer: They provide a clear and concise way of describing the behavior and structure of the system, and when the block diagram “language” is limited appropriately, they provide formal methods for analyzing system behavior. There are no universally accepted rules of block-diagram structure. The language of block diagrams is a living one; it evolves over time and has its own dialects. Block diagrams are quite useful for communicating system structure. However, they can also be used to analyze system behavior under certain sets of conditions. There are four tools for manipulating block diagrams: cascading gain blocks, moving summing junctions, combining summing junctions, and reducing loops.
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