Blunt slipstream calculation using the method of integral relations
Compressible, inviscid secondary injection and primary flows calculated using integral relation method for blunt bodies - application to thrust vector control
BLUNT BODY↗
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Results for “vector control”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Solid propulsion technology
Solid propulsion technology development for altitude, velocity, and thrust vector control
SOLID PROPELLANT↗
The Eco-Bio-Social Factors That Modulate Aedes aegypti Abundance in South Texas Border Communities
Aedes aegypti control requires dedicated resources that are usually scarce, limiting the reach and sustainability of vector control programs. This generates a need to focus on areas at risk of disease transmission and also understand the factors that might modulate local mosquito abundance. We evaluated the eco-bio-social factors that modulate indoor and outdoor relative abundance of female Ae. aegypti in communities of South Texas. We conducted housing quality and Knowledge Attitudes and Practices surveys in households that were part of a weekly mosquito surveillance program in November of 2017 and 2018. Our results showed widespread knowledge of mosquitoes and Zika virus by our participants. However, less than 35% considered them as serious problems in this region. The presence of window-mounted air conditioning units increased the risk of female mosquito relative abundance indoors. An increase in outdoor relative abundance was associated with larger properties and a higher number of children between 6 to 17 years of age. Interestingly, we observed that an increasing number of children <5 years of age modulated both indoor and outdoor relative abundance, with a 52% increase indoors and 30% decrease outdoors. The low perception of mosquito and disease risk highlights engagement needs for vector-borne disease prevention in this region. The identified risk factors can help guide public health officials in their efforts to reduce human and vector contact.
54 ENVIRONMENTAL SCIENCES↗
Linear Test Bed. Volume 2: Test Bed No. 2
Test bed No. 2 consists of 10 combustors welded in banks of 5 to 2 symmetrical tubular nozzle assemblies, an upper stationary thrust frame, a lower thrust frame which can be hinged, a power package, a triaxial combustion wave ignition system, a pneumatic control system, pneumatically actuated propellant valves, a purge and drain system, and an electrical control system. The power package consists of the Mark 29-F fuel turbopump, the Mark 29-0 oxidizer turbopump, a gas generator assembly, and propellant ducting. The system, designated as a linear aerospike system, was designed to demonstrate the feasibility of the concept and to explore technology related to thrust vector control, thrust vector optimization, improved sequencing and control, and advanced ignition systems. The propellants are liquid oxygen/liquid hydrogen. The system was designed to operate at 1200-psia chamber pressure at an engine mixture ratio of 5.5. With 10 combustors, the sea level thrust is 95,000 pounds.
Source record↗
Electropneumatic linear gimbal actuation system, model nv-bi, 29 june 1963 - 29 june 1964
Electropneumatic linear actuator for thrust vector control on J- 2 rocket engine
THRUST VECTOR CONTROL /TVC/↗
Solid Propellant Engineering
Solid propellant engineering, binder curing reactions, ATS engine development, pintle nozzle thrust vector control, and low pressure combustion
COMBUSTION↗
Voyager spacecraft system Task C summary Final technical report, Apr. 1966 - Jul. 1967
Mission planning, orbit determination, thrust vector control, and configuration management program for Voyager project - summary
VOYAGER PROJECT↗
Thrust vector orientation in pilot-controlled lunar landings.
Thrust vector control orientation during pilot controlled lunar landing with aid of visual references
LUNAR LANDING↗
On vectoring aircraft through thunderstorms
Vector control of military aircraft through thunderstorm by ground-based radar
VECTOR CONTROL↗
Analysis of a simple technique for establishing lunar orbits
Spacecraft guidance technique for establishing lunar parking orbits using thrust vector control in relation to lunar horizon
ORBITAL RENDEZVOUS↗
TECHNICAL ADVANTAGES OF FLUID POWER
Review of attitude control systems, from electric thrust-vector control on the mercury-redstone to the application of fluid power to saturn booster
HYDRAULIC CONTROL↗
Apollo guidance, navigation and control: Guidance system operations plan for manned CM earth orbital and lunar missions using Program COLOSSUS 3. Section 3: Digital autopilots (revision 14)
Digital autopilots for the manned command module earth orbital and lunar missions using program COLOSSUS 3 are discussed. Subjects presented are: (1) reaction control system digital autopilot, (2) thrust vector control autopilot, (3) entry autopilot and mission control programs, (4) takeover of Saturn steering, and (5) coasting flight attitude maneuver routine.
Source record↗
Flight simulation for flight control computer S/N 0104-1 (ASTP)
Flight control computer (FCC) 0104-I has been designated the prime unit for the SA-210 launch vehicle. The results of the final flight simulation for FCC S/N 0104-I are documented. These results verify satisfactory implementation of the design release and proper interfacing of the FCC with flight-type control sensor elements and simulated thrust vector control system.
Source record↗
On secondary gas injection in supersonic nozzles.
Thrust-vector control and flow field produced by secondary gas injection into supersonic stream
GAS FLOW↗
Analytical design and simulation evaluation of an approach flight director system for a jet STOL aircraft
A program was undertaken to develop design criteria and operational procedures for STOL transport aircraft. As part of that program, a series of flight tests shall be performed in an Augmentor Wing Jet STOL Aircraft. In preparation for the flight test programs, an analytical study was conducted to gain an understanding of the characteristics of the vehicle for manual control, to assess the relative merits of the variety of manual control techniques available with attitude and thrust vector controllers, and to determine what improvements can be made over manual control of the bare airframe by providing the pilot with suitable command guidance information and by augmentation of the bare airframe dynamics. The objective of the study is to apply closed-loop pilot/vehicle analysis techniques to the analysis of manual flight control of powered-lift STOL aircraft in the landing approach and to the design and experimental verification of an advanced flight director display.
Klein, R. H.↗
Simulator evaluation of a flight-path-angle control system for a transport airplane with direct lift control
A piloted simulator was used to evaluate the flight path angle control capabilities of a system that employs spoiler direct lift control. The system was designated the velocity vector control system and was compared with a baseline flight path angle control system which used elevator for control. The simulated airplane was a medium jet transport. Research pilots flew a manual instrument landing system glide slope tracking task and a variable flight path angle task in the landing configuration to obtain comparative performance data.
Kelley, W. W.↗
Pointing and control for planetary spacecraft - The first twenty years
The evolution of guidance and control systems for United States planetary and unmanned lunar spacecraft over the last 20 years is traced. The characteristics of the guidance and control systems used on spacecraft from the Range lunar impactor to the planned Galileo Jupiter orbiter and entry probe are surveyed, with attention given to the uses of three-axis stabilized, spin-stabilized and dual-spin designs. System performance trends that have evolved to meet the increasing science and mission requirements of the spacecraft are considered in the areas of attitude references, control consumables, dynamics and system modeling, thrust vector control, optical navigation, manuever turns, maneuver velocity control, instrument pointing, and antenna pointing. Hardware trends in optical sensors, inertial sensors, processing electronics, electromechanical devices, and system testing and reliability are also reviewed. The achievements represented by these advances are emphasized, and it is predicted that future developments will be in the areas of increased control system autonomy and performance requirements.
Pace, G. D.↗
Fuzzy efficiency optimization of AC induction motors
This paper describes the early states of work to implement a fuzzy logic controller to optimize the efficiency of AC induction motor/adjustable speed drive (ASD) systems running at less than optimal speed and torque conditions. In this paper, the process by which the membership functions of the controller were tuned is discussed and a controller which operates on frequency as well as voltage is proposed. The membership functions for this dual-variable controller are sketched. Additional topics include an approach for fuzzy logic to motor current control which can be used with vector-controlled drives. Incorporation of a fuzzy controller as an application-specific integrated circuit (ASIC) microchip is planned.
Jani, Yashvant↗