Simulation and Modeling of Engineering System Using Bond Graphs

[Pramod Harish Sahare] Volume 1: Issue 1, Dec 2013

Bond graphs offer a domain-neutral graphical technique for representing power flows in a physical system. They are particularly powerful for representing systems that operate in multiple energy domains, such as thermal models of electronic circuits, mechanical vibrations in acoustic systems, etc. It is an explicit graphical tool for capturing common energy structure of systems. The Bond Graph is composed of the bonds which link together single or multi elements, each bond represents the instantaneous flow of energy or power. The flow in each bond is denoted a pair of variables called 'power variables' whose product is the instantaneous power of the bond. For example, the bond of an electrical system would represent the flow of electrical energy and the power variables would be voltage and current, whose product is power. Each domain's power variables are broken into two types: "effort" and "flow". Effort multiplied by flow produces power, thus the term power variables. Every domain has a pair of power variables with a corresponding effort and flow variable. Examples of effort include force, torque, voltage, or pressure; while flow examples include velocity, current, and volumetric flow.
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