Computational Analysis and Characterization of Cockpit Environmental Control System of a Fighter Aircraft in Humid Environment

2014 ◽  
Vol 629 ◽  
pp. 263-269 ◽  
Author(s):  
Muhammad Ayaz ◽  
J. Masud
Keyword(s):  
Control System ◽  
Computational Analysis ◽  
Environmental Control ◽  
Great Flexibility ◽  
Fighter Aircraft ◽  
Efficient Operation ◽  
Analysis Techniques ◽  
Humid Environment ◽  
Computational Fluid Dynamics Cfd

he Environmental Control System (ECS) is an important part of any fighter aircraft and has far reaching repercussions in terms of its capability to operate as an effective weapon system under adverse weatherconditions. The aircrew and majority of electronics depend on ECS to keep temperature, pressure and humidity levels within acceptable limits for efficient operation. These limits are explicitly defined in relevant MIL standards MIL-E-18927E(AS)[1]. In order to thoroughly analyze the ECS of under study aircraft[2, 3], Computational Fluid Dynamics (CFD) analysis techniques have been used. CFD techniques offer great flexibility since various conditions can be simulated and analyzed results can be used for required improvements in the system.

scholarly journals Connectivity characterization of the mouse basolateral amygdalar complex

2019 ◽  
Author(s):  
Houri Hintiryan ◽  
Ian Bowman ◽  
David L. Johnson ◽  
Laura Korobkova ◽  
Muye Zhu ◽  
...  
Keyword(s):  
Cell Body ◽  
Computational Analysis ◽  
Functional Characterization ◽  
Granular Cell ◽  
Cell Types ◽  
Projection Neurons ◽  
Cell Type ◽  
Analysis Techniques ◽  
Cell Type Specific

ABSTRACTThe basolateral amygdalar complex (BLA) is implicated in behavioral processing ranging from fear acquisition to addiction. Newer methods like optogenetics have enabled the association of circuit-specific functionality to uniquely connected BLA cell types. Thus, a systematic and detailed connectivity profile of BLA projection neurons to inform granular, cell type-specific interrogations is warranted. In this work, we applied computational analysis techniques to the results of our circuit-tracing experiments to create a foundational, comprehensive, multiscale connectivity atlas of the mouse BLA. The analyses identified three domains within the classically defined anterior BLA (BLAa) that house target-specific projection neurons with distinguishable cell body and dendritic morphologies. Further, we identify brain-wide targets of projection neurons located in the three BLAa domains as well as in the posterior BLA (BLAp), ventral BLA (BLAv), lateral (LA), and posterior basomedial (BMAp) nuclei. Projection neurons that provide input to each nucleus are also identifed. Functional characterization of some projection-defined BLA neurons were demonstrated via optogenetic and recording experiments. Hypotheses relating function to connection-defined BLA cell types are proposed.

Analytical and Computational Analysis of Turbulent Bouyant Jets in the Containment Atmosphere

2008 ◽  
Author(s):  
Enrico Deri ◽  
Matteo Bucci ◽  
Etienne Studer ◽  
Daniele Abdo
Keyword(s):  
Large Scale ◽  
Computational Analysis ◽  
Severe Accident ◽  
Buoyant Jets ◽  
Computational Tools ◽  
Experimental Campaign ◽  
Hydraulic Conditions ◽  
Computer Codes ◽  
Computational Fluid Dynamics Cfd

In case of severe accident, complex thermal-hydraulics phenomena are expected to occur in the containment atmosphere. To investigate and understand these phenomena, fundamental for nuclear safety and design, major efforts are being spent all over the world. A new OECD project, named SETH-2, is conceived to generate relevant experimental data, useful to improve the modeling capabilities of the computer codes aimed to predict post-accident containment thermal-hydraulic conditions. The Commissariat a` l’Energie Atomique (CEA) contributes to the project performing experiments within the large scale MISTRA facility. Tests are proposed to investigate mixing phenomena promoted in a stratified containment. In particular, one of these test series concerns the interaction of buoyant jets with a stratified atmosphere. The present work is aimed to develop and validate computational tools useful to support the design of this experimental campaign and to analyze the actual MISTRA tests. In this aim, two different models have been implemented for turbulent buoyant jets in a stratified atmosphere: an engineering analytical model for a fast characterization of flow structures and a finite elements computational fluid dynamics (CFD) model that allows a detailed analysis of local phenomena. The models have been successfully validated for vertical buoyant jets in uniform atmosphere. Further experimental and numerical activities are illustrated, aimed to carry out the validation with stratified atmosphere and inclined injections.

Environmental Control of an Electronic System Integrated Into a Fighter Aircraft Pod

2004 ◽  
Author(s):  
Michel Engelhardt
Keyword(s):  
Control System ◽  
Environmental Control ◽  
Cooling System ◽  
Thermal Analyses ◽  
Thermal Control ◽  
Electronic System ◽  
Analytical Models ◽  
Fighter Aircraft ◽  
Performance Predictions ◽  
Main Components

An Environmental Control System (ECS) concept is developed to control the temperature of an Electronic System (ES) and to cool the airborne system Electronic Units (EUs). These units are integrated into a Pod that is attached to the centerline station of a fighter aircraft. The objective of this paper is to describe the thermal control system concept used to control the ES bay air temperature, humidity, and pressure; and the cooling system used to cool the EUs. Another objective of this paper is to provide a summary of the thermal-fluid analytical models and the ECS performance predictions. The main components of the ECS are based on vapor cycle cooling. The EUs that support system management and recording are air-cooled. Ground operations are accomplished through the autonomous ECS thermal control of the ES and fan cooling of the EUs. Thermal analyses at aircraft operational altitudes and speeds predict that the ES temperature is controlled within ±5°C of its temperature at take-off by the ECS. ES bay temperatures are held between preset lower and upper bound ES temperatures during the required MIL-STD-210A tropical day without condensation of moisture in the ES bay. In addition, thermal analyses indicate that the EUs are cooled throughout ground and airborne operation to ensure that electronic components are below their manufacturers’ rated temperature requirements.

Sign in / Sign up

Export Citation Format

Share Document