Abstract Hydraulic impedance, as an efficient frequency-domain analysis alternative, has been widely utilized in hydraulic transient for decades. Since the mathematical expressions of systems with complicated pipe networks are usually rather complex, it is difficult traditional continuous impedance method to obtain analytical solutions system’s frequency responses directly. Therefore, equivalen...

The present work revisits the reduction of nonlinear dynamics an electromechanical system through a quasi-steady state hypothesis, discussing fundamental aspects this type approach and clarifying some confusing points found in literature. Expressions for characteristic time scales are deduced from physical analysis that establishes analogy between kinetics chemical reaction. It provides justifi...

The aim of this work is to develop a top-oil thermal model based on the thermal-electrical analogy and heat transfer principles that captures influence prevailing winds solar radiation which can be generally applied large power transformers. key improvements proposed are calculating coefficient radiator air side using Nusselt number combined forced natural convection, including as an addition s...