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

2014 ◽  
Author(s):  
Jehanzeb Masud ◽  
Mohammad Ayyaz
Keyword(s):  
Control System ◽  
Computational Analysis ◽  
Environmental Control ◽  
Fighter Aircraft

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.

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.

scholarly journals RA3 is a reference-guided approach for epigenetic characterization of single cells

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shengquan Chen ◽  
Guanao Yan ◽  
Wenyu Zhang ◽  
Jinzhao Li ◽  
Rui Jiang ◽  
...  
Keyword(s):  
Single Cell ◽  
Computational Analysis ◽  
Reference Data ◽  
Single Cells ◽  
Chromatin Accessibility ◽  
Biological Variation ◽  
Superior Performance ◽  
High Dimensionality ◽  
High Degree

AbstractThe recent advancements in single-cell technologies, including single-cell chromatin accessibility sequencing (scCAS), have enabled profiling the epigenetic landscapes for thousands of individual cells. However, the characteristics of scCAS data, including high dimensionality, high degree of sparsity and high technical variation, make the computational analysis challenging. Reference-guided approaches, which utilize the information in existing datasets, may facilitate the analysis of scCAS data. Here, we present RA3 (Reference-guided Approach for the Analysis of single-cell chromatin Accessibility data), which utilizes the information in massive existing bulk chromatin accessibility and annotated scCAS data. RA3 simultaneously models (1) the shared biological variation among scCAS data and the reference data, and (2) the unique biological variation in scCAS data that identifies distinct subpopulations. We show that RA3 achieves superior performance when used on several scCAS datasets, and on references constructed using various approaches. Altogether, these analyses demonstrate the wide applicability of RA3 in analyzing scCAS data.

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