scholarly journals Comparison of High-Fidelity Computational Tools for Wing Design of a Distributed Electric Propulsion Aircraft

2017 ◽  
Author(s):  
Karen A. Deere ◽  
Sally Viken ◽  
Melissa Carter ◽  
Jeffrey K. Viken ◽  
Joseph M. Derlaga ◽  
...  
Keyword(s):  
Electric Propulsion ◽  
High Fidelity ◽  
Wing Design ◽  
Computational Tools

Experimental Platforms for Validation of Computational Approaches to Simulating Cardiovascular Flows

2013 ◽  
Author(s):  
Neelakantan Saikrishnan ◽  
Jean-Pierre Rabbah ◽  
Paul Gunning ◽  
Ikay Okafor ◽  
Arvind Santhanakrishnan ◽  
...  
Keyword(s):  
Fluid Mechanics ◽  
Patient Specific ◽  
High Fidelity ◽  
Left Heart ◽  
Computational Tools ◽  
Computational Approaches ◽  
Cardiovascular Fluid Mechanics ◽  
Geometric Conditions ◽  
Flow Pressure ◽  
Institute Of Technology

This paper describes three different versions of left heart simulators that have been developed at the Cardiovascular Fluid Mechanics Laboratory at Georgia Institute of Technology, specifically designed to provide high fidelity experimental datasets necessary for rigorous validation of computational tools. These systems are capable of simulating physiological and pathological flow, pressure and geometric conditions, and can be investigated using a variety of experimental tools to measure relevant biomechanical quantities. The development of such robust simulators is a critical step in ensuring applicability of patient specific computational tools.

Environmentally Conscious Wing Design for the Medium Altitude Long Endurance Unmanned Aerial Vehicle

2009 ◽  
Author(s):  
Liaquat U. Iqbal ◽  
Gautam S. Naik ◽  
Daniel Pothala ◽  
Phani Kiran Surapaneni ◽  
Fu Zhao ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Material Selection ◽  
Integrated Approach ◽  
High Fidelity ◽  
Wing Design ◽  
Element Analysis ◽  
Environmentally Conscious ◽  
Environmentally Conscious Design ◽  
The Military ◽  
Long Endurance

The use of Unmanned Aerial Vehicles (UAVs) has become widespread and is ever increasing. There are plans for utilizing the UAVs for the military as well as the humanitarian and law enforcement missions such as flood and hurricane relief, firefighting, drug trafficking control, and so on. The number of UAVs is likely to continue to grow exponentially in the near future and there is a great need for the environmentally conscious design and manufacturing efforts in the UAV market. The authors are developing an integrated approach to bring the high fidelity Computer Aided Design and Engineering (CAD/E) tools to the preliminary design phase for designing new aircraft. In this paper, this approach is extended to include the environmentally conscious material selection when designing a UAV wing for the medium altitude long endurance mission. Finite Element Analysis is used to determine the material needed for the wing and the computed weights are supplied to the spreadsheet for calculating environmental impacts of different materials selected for the wing design. This spreadsheet has been developed based on the data in the Lifecycle Assessment software package SimaPro/Ecoinvent. The study demonstrates how to integrate environmental considerations into the preliminary UAV design using high fidelity models.

Simulation of a High Fidelity Turboshaft Engine-Alternator Model for Turboelectric Propulsion System Design and Applications

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
I. Yazar
Keyword(s):  
System Design ◽  
Electric Propulsion ◽  
Combustion Engine ◽  
Open Loop ◽  
Propulsion System ◽  
High Fidelity ◽  
Propulsion Systems ◽  
The Real ◽  
Hybrid Electric ◽  
Turboshaft Engine

Abstract The term sustainability became a popular subject both in the automotive industries and in the aerospace industries. Increasing and threatening environmental pollution problems and reduction in limited fuel sources are motivating either industries and academicians to develop alternative power systems to sustain more healthier and economical life in the long term. One innovation that has been researched in the automotive industry is all electric and hybrid electric propulsion concepts. These concepts have also been proposed as alternative solutions for aviation. These novel propulsion technologies are composed of a gas turbine/internal combustion engine structure (necessary for hybrid electric and turboelectric propulsion systems) and/or energy storage components (battery, fuel cell and so on.) with multiple electric motors respectively. In this paper, simulation of a high fidelity turboshaft engine-alternator model for turboelectric propulsion system is derived. To develop an aero-thermal engine model, GE T700 turboshaft engine data is used and constructed model is connected to an alternator model on MATLAB/Simulink environment. Open-loop simulations are carried out and satisfactory results are obtained.Simulation results are compared to the real engine design point data. Results show that there are acceptable differences between the simulation results and the real engine data. The power balances between compressor - high pressure turbine and power turbine – alternator are proven in the mathematical model. It is expected that the proposed model can be easily extended to power system design and power management studies in turboelectric propulsion systems and also in other suitable novel propulsion systems.

scholarly journals The Advanced Control Approach based on SMC Design for the High-Fidelity Haptic Power Lever of a Small Hybrid Electric Aircraft

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2974
Author(s):  
Aleš Hace
Keyword(s):  
Electric Propulsion ◽  
Control Design ◽  
State Of Charge ◽  
Specific Information ◽  
High Fidelity ◽  
Powertrain System ◽  
Advanced Control ◽  
Battery State Of Charge ◽  
Hybrid Electric ◽  
Haptic Patterns

In the serial hybrid electric propulsion system of a small propeller aircraft the battery state of charge is fluctuating due to the diversity of possible power flows. Overwhelming visual information on the cockpit displays, besides requiring visual pilot attention, increases pilot workload, which is undesirable, especially in risky flight situations. Haptic interfaces, on the other hand, can provide intuitive cues that can be applied to enhance and simplify the cockpit. In this paper, we deal with an enhanced power lever stick, which can provide feedback force feel with haptic cues for enhanced information flow between the pilot and the powertrain system. We present selected haptic patterns for specific information related to the fluctuating battery state of charge. The haptic patterns were designed to reduce pilot workload, and for easy use, safe and energy-efficient control of the hybrid electric powertrain system. We focus on the advanced control design for high-performance force feedback required for rendering fine haptic signals, which stimulates the sensitive haptics of a pilot’s hand-arm system. The presented control algorithm has been designed by the sliding mode control (SMC) approach in order to provide disturbance rejection and high-fidelity haptic rendering. The proposed control design has been validated on an experimental prototype system.

Numerical Simulation of Container Breach and Airborne Release of Solids Due to Mechanical Insults

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
David L. Y. Louie ◽  
San Le ◽  
Lindsay N. Gilkey
Keyword(s):  
Solid Mechanics ◽  
Source Term ◽  
Free Fall ◽  
Department Of Energy ◽  
High Fidelity ◽  
Computational Tools ◽  
Respirable Fraction ◽  
Waste Container ◽  
Model Predictions ◽  
Accident Conditions

Abstract Throughout U.S. Department of Energy (DOE) complexes, safety engineers employ the five-factor formula to calculate the source term (ST) that includes parameters of airborne release fraction (ARF), respirable fraction (RF) and damage ratio (DR). Limited experimental data on fragmentation of solids, such as ceramic pellets (i.e., PuO2), and container breach due to mechanical insults (i.e., drop and forklift impact), can be supplemented by modeling and simulation using high fidelity computational tools to estimate these parameters. This paper presents the use of Sandia National Laboratories' SIERRA solid mechanics (SM) finite element code to investigate the behavior of the widely utilized waste container (such as 7A Drum) subject to a range of free fall impact and puncture scenarios. The resulting behavior of the container is assessed, and the estimates are presented for bounding DRs from calculated breach areas for the various accident conditions considered. This paper also describes a novel multiscale constitutive model recently implemented in SIERRA/SM that simulates the fracture of brittle materials such as PuO2 and determines ARF during the fracture process. Comparisons are made between model predictions and simple bench-top experiments.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

Using the Theory of Planned Behavior to Predict Faking in Selection Exercises Varying in Fidelity

2018 ◽  
Vol 17 (3) ◽  
pp. 155-160 ◽  
Author(s):  
Daniel Dürr ◽  
Ute-Christine Klehe
Keyword(s):  
Theory Of Planned Behavior ◽  
Planned Behavior ◽  
Predictive Validity ◽  
Group Discussion ◽  
Role Play ◽  
Selection Procedure ◽  
High Fidelity ◽  
Selection Research ◽  
Play Group

Abstract. Faking has been a concern in selection research for many years. Many studies have examined faking in questionnaires while far less is known about faking in selection exercises with higher fidelity. This study applies the theory of planned behavior (TPB; Ajzen, 1991 ) to low- (interviews) and high-fidelity (role play, group discussion) exercises, testing whether the TPB predicts reported faking behavior. Data from a mock selection procedure suggests that candidates do report to fake in low- and high-fidelity exercises. Additionally, the TPB showed good predictive validity for faking in a low-fidelity exercise, yet not for faking in high-fidelity exercises.

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