The Experts below are selected from a list of 13602 Experts worldwide ranked by ideXlab platform

Hoyon Hwang - One of the best experts on this subject based on the ideXlab platform.

Ralf Sommer - One of the best experts on this subject based on the ideXlab platform.

  • strategies for Initial Sizing and operating point analysis of analog circuits
    Design Automation and Test in Europe, 2011
    Co-Authors: V Boos, J Nowak, S Henker, S Hoppner, M Sylvester, H Grimm, D Krausse, Ralf Sommer
    Abstract:

    This work presents novel analog Sizing flows based on analytical techniques. A graph-based operating point driven Sizing approach provides operating point voltages and a rough Sizing with respect to constraints. A voltage-range analysis method using linearized operating-point models obtains information about feasible voltage ranges. A direct-Sizing method solves nonlinear algebraic circuit equations directly to obtain design parameters from specifications. All three methods require no or only minimum simulation effort and can provide quick insight into circuit design space and constraints in an early design stage. They allow flexible inclusion into state-of-the-art simulation-based optimization flows, where they lead to improved results with less optimization effort and prevent unnecessary simulation effort on unfeasible circuit topologies. The Sizing flows are enhanced by a commercial optimization tool in order to obtain reliable circuits.

  • DATE - Strategies for Initial Sizing and operating point analysis of analog circuits
    2011 Design Automation & Test in Europe, 2011
    Co-Authors: V Boos, J Nowak, S Henker, M Sylvester, H Grimm, D Krausse, S Höppner, Ralf Sommer
    Abstract:

    This work presents novel analog Sizing flows based on analytical techniques. A graph-based operating point driven Sizing approach provides operating point voltages and a rough Sizing with respect to constraints. A voltage-range analysis method using linearized operating-point models obtains information about feasible voltage ranges. A direct-Sizing method solves nonlinear algebraic circuit equations directly to obtain design parameters from specifications. All three methods require no or only minimum simulation effort and can provide quick insight into circuit design space and constraints in an early design stage. They allow flexible inclusion into state-of-the-art simulation-based optimization flows, where they lead to improved results with less optimization effort and prevent unnecessary simulation effort on unfeasible circuit topologies. The Sizing flows are enhanced by a commercial optimization tool in order to obtain reliable circuits.

Marco Filippi - One of the best experts on this subject based on the ideXlab platform.

  • Integrated solar heating systems: From Initial Sizing procedure to dynamic simulation
    Solar Energy, 2009
    Co-Authors: Yoan Raffenel, Enrico Fabrizio, Joseph Virgone, Eric Blanco, Marco Filippi
    Abstract:

    The Sizing of the solar installation of an individual dwelling is a problem which can be solved in many ways. The approach described in this paper is a simplified procedure of considerable interest. It requires only a small quantity of data and can be computed in a short time. The performance of this procedure was evaluated by a more complex Sizing method based on detailed simulation. The simplified procedure was applied to the case of an individual dwelling using a solar collector field to produce domestic hot water and space heating. The building and the solar installation have then been modelled with the software TRNSYS 16 and their behaviour was simulated during a whole year. The results obtained are particularly close to the ones expected by the simplified Sizing procedure.

Kenji Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • ISPE CE - Initial Sizing Model of PV/battery System with Battery Scheduling Algorithm
    Advanced Concurrent Engineering, 2011
    Co-Authors: Kazuki Maeda, Yuki Imanishi, Kenji Tanaka
    Abstract:

    This study presents an optimal Sizing model for PV/battery systems with battery scheduling algorithms. We propose multistep leveling algorithms to determine the half-hourly charge/discharge schedule of a battery. The purpose of these scheduling algorithms is to utilize the available solar energy and to reduce the electricity cost for dwelling houses. The model calculates the optimal size of a PV/battery system in terms of payback time. The following three cases are simulated; more than 25% reduction of CO2 emission, more than 50% reduction of CO2 emission and unconstrained CO2 reduction.

  • Initial Sizing model of pv battery system with battery scheduling algorithm
    ISPE CE, 2011
    Co-Authors: Kazuki Maeda, Yuki Imanishi, Kenji Tanaka
    Abstract:

    This study presents an optimal Sizing model for PV/battery systems with battery scheduling algorithms. We propose multistep leveling algorithms to determine the half-hourly charge/discharge schedule of a battery. The purpose of these scheduling algorithms is to utilize the available solar energy and to reduce the electricity cost for dwelling houses. The model calculates the optimal size of a PV/battery system in terms of payback time. The following three cases are simulated; more than 25% reduction of CO2 emission, more than 50% reduction of CO2 emission and unconstrained CO2 reduction.

Cees Bil - One of the best experts on this subject based on the ideXlab platform.

  • Initial Sizing Methodology for Hybrid-Electric General Aviation Aircraft
    Journal of Aircraft, 2020
    Co-Authors: D.f. Finger, Cees Bil, Carsten Braun
    Abstract:

    Electric and hybrid-electric propulsion offer unique possibilities to improve aircraft efficiency and performance. The potential advantages are fuel savings, lower emissions, and reduced noise. Bec...

  • Impact of Battery Performance on the Initial Sizing of Hybrid-Electric General Aviation Aircraft
    Journal of Aerospace Engineering, 2020
    Co-Authors: D.f. Finger, Carsten Braun, Cees Bil
    Abstract:

    AbstractStudies suggest that hybrid-electric aircraft have the potential to generate fewer emissions and be inherently quieter when compared to conventional aircraft. By operating combustion engine...

  • Impact of Engine Failure Constraints on the Initial Sizing of Hybrid-Electric GA Aircraft
    AIAA Scitech 2019 Forum, 2019
    Co-Authors: D Finger, Carsten Braun, Cees Bil
    Abstract:

    Potential advantages of hybrid-electric aircraft are fuel savings, lower emissions, and reduced noise. Since these aircraft generally apply multiple power sources, they can also be designed to sustain flight if certain parts of the propulsion system fail. Thus, an increase in flight safety can be another benefit of hybrid-electric propulsion concepts. In this paper, the influence of safety constraints on the Initial Sizing for a hybrid electric 4-seat general aviation aircraft will be analyzed. For this purpose, a simplified optimization method is applied to perform the Initial Sizing under consideration of One Engine Inoperative (OEI) constraints. The OEI constraints significantly reduce the available design space. If a hybrid-electric aircraft must be able to fly a single traffic pattern on one engine or motor, the mass increase can be less than 10% of MTOM. If a 100 km diversion is considered, the mass increase can be up to 50% of MTOM, depending on battery technology.

  • Initial Sizing for a Family of Hybrid-Electric VTOL General Aviation Aircraft
    2018
    Co-Authors: D.f. Finger, Carsten Braun, Falk Götten, Cees Bil
    Abstract:

    For vertical take-off and landing (VTOL) aircraft, the power needed for vertical take-off is much greater than the power needed for cruise. This power-matching problem can be solved with a balanced hybrid-electric propulsion system. However, there is a trade-off between take-off weight, wing loading, battery technology and range. This paper applies a new Initial Sizing algorithm for transitioning VTOL aircraft with hybrid-electric propulsion systems, including serial-hybrid and parallel-hybrid configurations. Exemplarily, a family of transitioning VTOL aircraft, intended for urban air mobility (air taxi) operations is designed. Results indicate that hybrid-electric propulsion systems must be considered for future mid-range VTOL aircraft. Very short missions favor fully electric propulsion systems, as this configuration avoids the complexity of a hybrid.

  • Case Studies in Initial Sizing for Hybrid-Electric General Aviation Aircraft
    2018 AIAA IEEE Electric Aircraft Technologies Symposium (EATS), 2018
    Co-Authors: Felix D. Finger, Carsten Braurr, Cees Bil
    Abstract:

    This paper showcases the potential influence of hybrid-electric propulsion systems on the performance of general aviation aircraft. Using the Cirrus SR-22 as a baseline, parallel- and serial-hybrid propulsion configurations are explored. For these case studies a high level approach is chosen, using an innovative Initial Sizing methodology to determine weight or energy consumption of new aircraft concepts. Mission parameters and aerodynamic performance are varied and the impact on aircraft fuel and energy consumption, as well as on take-off mass is studied. The studies' results indicate that hybrid-electric aircraft consume less energy than conventionally propelled designs for certain missions. However, the aircraft's design point, in terms of wing loading and installed power must be changed: Hybrid-electric aircraft should be sized with a higher power-to-weight ratio and a higher wing loading than their conventional counterparts.