A bond graph approach to the modeling and simulation of switch regulated DC-to-DC power supplies

The heat-flux measurement is the precondition of the structure and cooling system design for hypersonic aircraft, while no experiment method can be applied to the heat-flux measurement of the sharp leading edge for its small size and highheat flux. In this article, an experimental method based on the law of inverse conduction is proposed in this paper for the calculation of heat flux from the inner wall temperature of the sharp leading edge. This experimental method proposed includes the method of inner wall transient temperature acquisition, smoothing technique, and the Matlab and Fluent cosimulation postprocessor, where Fluent is used as a 3D unsteady heat conduction solver, and conjugate gradient method is applied for optimization. The effectiveness of the proposed method is verified by its application in the scramjet experiment for the heat-flux measurement on the strut-leading edge, which greatly helps the assessment of thermal environment with a total error of less than 5%.

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“…25 The Fluent solver supports two kinds of operating mechanisms: GUI (Graphical User Interface) and TUI (Text User Interface).…”

Section: Matlab and Fluent Interface Technologymentioning

confidence: 99%

Experimental method study on heat flux measurement on sharp leading edge

Zhou

Wang

Bao

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Linking the WRSM, the DFIM and the DC-AC inverter through the stator side of both machines, and connecting the battery by means of the DC-DC and DC-AC power converters, the whole model is obtained, see Figure 9. In this case, power converters are modeled as a modulated transformer, MTF, which represents de averaged duty-cycle of the switches, [29]. Also, multi-bonds are used for the dq-coordinates in order to simplify the bond graph.…”

Section: Bond Graph Modelmentioning

confidence: 99%

Direct synchronous-asynchronous conversion system for hybrid electrical vehicle applications. An energy-based modeling approach

Munoz-Aguilar¹,

Dòria‐Cerezo²,

Puleston³

2013

International Journal of Electrical Power & Energy Systems

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This paper presents a proposal for a series hybrid electric vehicle propulsion system. This new configuration is based on a wound-rotor synchronous generator (WRSM) and a doubly-fed induction machine (DFIM). The energybased model of the whole system is obtained taking advantage of the capabilities of the port-based modeling techniques. From the dq port-controlled Hamiltonian description of the WRSM and DFIM, the Hamiltonian model of the proposed Direct Synchronous-Asynchronous Conversion System (DiSAC) is developed. Subsequently, the bond graph models of the DiSAC and associate systems are also provided. Numerical simulations are also presented in order to validate the proposed system. Index TermsAC Machines, Hybrid Electric Vehicle, Modeling.

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“…A passivity based approach discussed in [4], [5] is used for deriving the BG model of the buck boost converter. This approach models the system behavior in two stages: (i) an energy shaping stage, where the closed loop total energy of the system is modified, and (ii) a damping injection stage, where the required dissipation is added in order to achieve asymptotic stability.…”

Section: Dc-dc Converter Modelmentioning

confidence: 99%

Model-Based Avionics Systems Fault Simulation and Detection

Bharadwaj

Kim

Kulkarni

et al. 2010

AIAA Infotech@Aerospace 2010

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This paper proposes a combined energy-based model with an empirical physics of failure model for degradation analysis and prognosis of electrolytic capacitors in DC-DC power converters. Electrolytic capacitors and MOSFET's have higher failure rates than other components in DC-DC converter systems. For example, in avionics systems where the power supply drives a GPS unit, ripple currents can cause glitches in the GPS position and velocity output, and this may cause errors in the navigation solution causing the aircraft to fly off course. A model based approach to studying degradation phenomena enables us to combine the energy based modeling of the DC-DC converter with physics of failure models of capacitor degradation, and predict using stochastic simulation methods how system performance deteriorates with time. We have employed a topological energy based modeling scheme based on the bond graph (BG) modeling language for building parametric models of multi-domain physical systems. Our current work adopts a physics of failure model (Arrhenius Law) for equivalent series resistance (ESR) increase in electrolytic capacitors subjected to electrical and thermal stresses. The derived degradation model of the capacitor is reintroduced into the DC-DC converter system model to study changes in the system performance using Monte Carlo simulation methods.

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A bond graph approach to the modeling and simulation of switch regulated DC-to-DC power supplies

Cited by 21 publications

References 16 publications

Experimental method study on heat flux measurement on sharp leading edge

Experimental method study on heat flux measurement on sharp leading edge

Direct synchronous-asynchronous conversion system for hybrid electrical vehicle applications. An energy-based modeling approach

Model-Based Avionics Systems Fault Simulation and Detection

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