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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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The application of linear servo theory to the design of agc loops
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Fabrication and test of a flueric position servo Quarterly report, 10 Sep. - 10 Dec. 1965
Fabrication and testing of flueric pneumatic drum actuator for nuclear rocket engine
Hovering performance characteristics of a rotor with and without blade-pitch servo-control flaps
Photographic performance evaluation of hovering helicopter rotor with and without blade pitch servocontrol flaps
Servo control and data synchronization study
Magnetic tape recorder-reproducer to accept data pulses at varying rates, record data at constant rate, and retrieve recorded data at rate synchronized to external clock
Servo control and data synchronization study
Breadboard magnetic tape recorder-reproducer with servocontrol and data synchronization
Alternating current electromagnetic servo induction meter
Electromagnetic device accurately indicates the responses of various sensors in high performance flight research aircraft to conditions encountered in flight. The device responds to sensor inputs to move a slideable armature along an indicator scale by the force of currents induced in the armature winding.
Servo control and data synchronization study Final report
Investigation of magnetic tape recorder-reproducer to accept data pulses at varying rates, record at constant packing density, and retrieve at rates synchronized to external clock
Development of design criteria and performance improvement techniques for a low temperature hydraulic servo system Final report
Servovalve design for low temperature space applications
Fast response electrohydraulic servo system
Electrohydraulic fast response servosystem design and operation, describing nonlinear model based on component limitations
Design of a precise servo control system
Telescope servocontrol system with low pointing error and drift rate, permitting extended time exposure photography of star or deep space probe
Servo-controlled infrared optometer
Servocontrolled IR optometer providing electrical signal proportional to refractive power of human eye
Servo-controlled decoupler eliminates oscillations in fluid flow - A concept
Active control technique, using accelerometer-controlled servovalve to operate a compensating piston, effectively eliminates pressure fluctuations due to longitudinal structural vibration within a relatively long bandwith.
Some effects of servo amplifier response on determining accelerometer dynamic characteristics
Servoamplifier dynamic response effects on dynamic characteristics of fluid-filled pendulous accelerometers
A fast acting electrical servo for the actuation of full span, Fowler-type wing flaps in DLC applications: A detail design study
The philosophy and detail design of an electro-mechanical actuator for Fowler-type wing flaps which have a response time constant of 0.025 seconds are described. A conventional electrical servomotor with a power rating twice the maximum power delivered to the load is employed along with adaptive, gain-scheduled feedback and various logic circuits, including one to remove electrical excitation from the motor during extended periods when no motion of the flap is desired.
Digital servo control of random sound fields
It is necessary to place number of sensors at different positions in sound field to determine actual sound intensities to which test object is subjected. It is possible to determine whether specification is being met adequately or exceeded. Since excitation is of random nature, signals are essentially coherent and it is impossible to obtain true average.
Digital servo controller behaves like synchro
Encoder has been used for years to measure accurately positional parameters of controlled devices with very high accuracy and reliability. Digital control system has been designed using digital shaft angle encoders.
A flight simulator for advanced aircraft - Servo design to realization.
Discussion of computer-aided design results obtained for a moving-base, three-man flight simulator. From a control viewpoint, the structure is discussed in terms of disturbance torques, damping ratios, natural frequencies, load acceleration, and smoothness. The use of inertia to achieve well-behaved structural transfer functions and smooth or high fidelity load accelerations is demonstrated. Transfer functions in the complex frequency domain, as well as time-dependent solutions to the system, are derived. The relative merits of using position and/or velocity as primary feedback, for a limited travel acceleration device, are discussed. Root locus plots, which were utilized in the control-system design, Bode plots, and time-dependent plots are drawn. In addition, the theoretical ratio of velocity to commanded input Bode plot is compared to the experimental results, and the dramatic effect on the load smoothness plot caused by selecting velocity over position as primary feedback is shown.