From the bitsavers.org collection, a scanned-in computer-related document. micropolis :: 100315 Microdisk Unpacking and Installation Guidelines May82
Topics: drive, dwg, rev, shipping, controller, revisions, interface, board, configuration, mounting, device...
Peel testing was selected for evaluating the performance of the epoxy-black oxide bond under test conditions. This type of test was well suited because it was quantitative, repeatable and the test specimens could be laminated into flat pieces, resembling an MLB. It was established that the bond between epoxy prepreg and properly applied black oxide coating on copper foil is more heat resistant and stronger than the bond to the untreated foil. Thermal testing degrades the black oxide bond...
Topics: DTIC Archive, DeForest,W S, ROCKWELL INTERNATIONAL ANAHEIM CALIF AUTONETICS GROUP, *COATINGS,...
This system is a network of joint mounted dual axes digital servo-controllers (DDSC), providing control of various joints and end effectors of different robotic systems. This report provides description of and user required information for the Digital Controller System Network (DSCN) and, in particular, the DDSC, Model DDSC-2, developed to perform the controller functions. The DDSC can control 3 phase brushless or brush type DC motors, requiring up to 8 amps. Only four wires, two for power and...
Topics: NASA Technical Reports Server (NTRS), CONTROL SYSTEMS DESIGN, CONTROLLERS, DIGITAL SYSTEMS,...
This presentation discusses fractured leads on field-programmable gate array (FPGA) during flight vibration. Actions taken to determine root cause and resolution of the failure include finite element analysis (FEA) and vibration testing and scanning electron microscopy (with X-ray microanalysis) and energy dispersive spectrometry (SEM/EDS) failure assessment. Bonding methods for surface mount parts is assessed, including critical analysis and assessment of random fatigue damage. Regarding...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT BOARDS, FIELD-PROGRAMMABLE GATE ARRAYS, SEMICONDUCTOR...
The Structures and Materials Division at Glenn Research Center is devoted to developing advanced, high-temperature materials and processes for future aerospace propulsion and power generation systems. The Polymers Branch falls under this division, and it is involved in the development of high-performance materials, including polymers for high-temperature polymer matrix composites; nanocomposites for both high- and low-temperature applications; durable aerogels; purification and...
Topics: NASA Technical Reports Server (NTRS), COATING, CIRCUIT BOARDS, AEROGELS, NANOCOMPOSITES, HIGH...
Current and future near-Earth and deep space exploration programs and space defense programs require the development of robust intra-spacecraft serial data transfer electronics that must be reconfigurable, fault-tolerant, and have the ability to operate effectively for long periods of time in harsh environmental conditions. Existing data transfer systems based on state-of-the-art serial data transfer protocols or passive backplanes are slow, power-hungry, and poorly reconfigurable. They provide...
Topics: NASA Technical Reports Server (NTRS), CHANNELS (DATA TRANSMISSION), CIRCUIT BOARDS, REDUNDANCY,...
This paper reviews ceramic substrates and thick-film metallization based packaging technologies in development for 500degC silicon carbide (SiC) electronics and sensors. Prototype high temperature ceramic chip-level packages and printed circuit boards (PCBs) based on ceramic substrates of aluminum oxide (Al2O3) and aluminum nitride (AlN) have been designed and fabricated. These ceramic substrate-based chiplevel packages with gold (Au) thick-film metallization have been electrically...
Topics: NASA Technical Reports Server (NTRS), ELECTRONIC PACKAGING, CERAMICS, CIRCUIT BOARDS, CHIPS...
This document establishes the design guideline of the Modular Instrumentation Data Acquisition (MI-DAQ) system in utilization of several designs available in EV. The MI- DAQ provides the options to the customers depending on their system requirements i.e. a 28V interface power supply, a low power battery operated system, a low power microcontroller, a higher performance microcontroller, a USB interface, a Ethernet interface, a wireless communication, various sensor interfaces, etc. Depending on...
Topics: NASA Technical Reports Server (NTRS), SPECIFICATIONS, MODULARITY, DATA ACQUISITION, SYSTEMS...
A display enhancement implemented on the new VDM-1 video display board installed in a LORAN-C navigation receiver is addressed. Increased character size for easier viewing of the 3.75 inch diagonal CRT display is provided.
Topics: NASA Technical Reports Server (NTRS), ALPHANUMERIC CHARACTERS, CIRCUIT BOARDS, COMPUTER GRAPHICS,...
The design of a low sidelobe 19 element microstrip cluster and its distribution network is described. The problem of spillover illumination of an adjacent reflector in a multiple aperture reflector system is addressed. A practical implementation of the array is presented which requires only one printed circuit board for the distribution network with the potential for being easily tailored to a wide range of excitation distributions.
Topics: NASA Technical Reports Server (NTRS), ANTENNAS, REFLECTORS, CIRCUIT BOARDS, COMMUNICATION NETWORKS,...
Traditional electronics are assembled as a planar arrangement of components on a printed circuit board (PCB) or other type of substrate. These planar assemblies may then be plugged into a motherboard or card cage creating a volume of electronics. This architecture is common in many military and space electronic systems as well as large computer and telecommunications systems and industrial electronics. The individual PCB assemblies can be replaced if defective or for system upgrade. Some...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT BOARDS, PRINTED CIRCUITS, THREE DIMENSIONAL MODELS,...
A special-purpose computer code for a deformable-mirror adaptive-optics control system transmits pixel-registered control from (1) a personal computer running software that generates the control data to (2) a circuit board with 128 digital-to-analog converters (DACs) that generate voltages to drive the deformable-mirror actuators. This program reads control-voltage codes from a text file, then sends them, via the computer s parallel port, to a circuit board with four AD5535 (or equivalent)...
Topics: NASA Technical Reports Server (NTRS), ADAPTIVE OPTICS, CIRCUIT BOARDS, DEFORMABLE MIRRORS, C...
Lessons Learned: a) Avionics data can playa critical role in the investigation of a "close call" or accident. b) Avionics designers should think about the role their systems might play in an investigation. c) Know your data, down to the bit level. d) Know your spacecraft - follow the data. e) Internal placement of circuit cards can affect their survivability. f) Think about how to reconstruct nonvolatile memory (e.g. serialize IC's, etc.) g) Use of external assets can aid in...
Topics: NASA Technical Reports Server (NTRS), AVIONICS, CIRCUIT BOARDS, SPACE SHUTTLES, ACCIDENT...
Voltages up to 10,000 volts or higher must be attenuated and measured to provide control feedback for many applications like medium voltage generators or pulsed power systems. How these medium voltage signals can be conditioned so that they can be input to analog control circuits or analog-to-digital converters is the focus of this thesis. A preconditioner circuit takes as input a medium voltage signal and outputs a low voltage conditioned signal to an analog-to-digital converter. Each of the...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *CIRCUIT ANALYSIS, ANALOG TO DIGITAL...
The primary'technical objective of this project is to undertake comprehensive testing to generate information on failure modes/criteria to better understand the reliability of: Packages (e.g., Thin Small Outline Package [TSOP], Ball Grid Array [BGA], Plastic Dual In-line Package [PDIPD assembled and reworked with lead-free alloys Packages (e.g., TSOP, BGA, PDIP) assembled and reworked with mixed (lead/lead-free) alloys.
Topics: NASA Technical Reports Server (NTRS), SOLDERS, TIN ALLOYS, NICKEL ALLOYS, ACCEPTABILITY, CIRCUIT...
Printed-circuit stick module has reduced comb technique to six steps, cutting process time by approximately 50%. Method incorporates all type of components into one assembly. It reduces design and fabrication time for 14-lead flat pack to less than four hours and for the 22-lead flat pack to four hours. Average weight of each flat pack is also reduced to 2 g.
Topics: NASA Technical Reports Server (NTRS), CIRCUIT BOARDS, ELECTRONIC PACKAGING, PRINTED CIRCUITS,...
The present invention is a stackable telemetry circuit board for use in telemetry systems for satellites and other purposes. The present invention incorporates previously-qualified interchangeable circuit boards, or "decks," that perform functions such as power, signal receiving and transmission, and processing. Each deck is adapted to serve a range of telemetry applications. This provides flexibility in the construction of the stackable telemetry circuit board and significantly...
Topics: NASA Technical Reports Server (NTRS), TRANSPONDERS, TELEMETRY, CIRCUIT BOARDS, SIGNAL TRANSMISSION,...
Faster, more powerful processors are being incorporated into embedded computer system to execute increasingly complicated algorithms in real time resulting in a need to transfer more data between the embedded computer and external sensors and servos at a faster rate. To meet these real time requirements, while decreasing the size of the embedded computer hardware, a multifunction, VME-based I/O controller and A/D conversion system was designed, developed, and tested which controls 16 channels...
Topics: DTIC Archive, Robertson, Melanie M, WRIGHT LAB WRIGHT-PATTERSON AFB OH, *INFORMATION TRANSFER,...
This study examined investment opportunities in Manufacturing Technology (MT) related to electronic systems procurement and presents an initial candidate plan for the FY80 to 84 timeframe. The major cost areas for electronic products were determined by a top down study of the detailed breakout of electronics subcomponent and labor categories. Results indicate that about half of electronics costs are found in seven key material areas. The remainder of the cost is apportioned into 4 labor areas....
Topics: DTIC Archive, Knasel,T M, SCIENCE APPLICATIONS INC MCLEAN VA MANUFACTURING TECHNOLOGY PROJECT...
A demonstration test to investigate the reverberation characteristics of the avionics bay and cockpit of a typical commercial aircraft was conducted on a decommissioned Boeing 707-720B aircraft. The aircraft, located at the Aerospace Maintenance and Regeneration Center, Davis Monthan Air Force Base, Arizona, had a significant fraction of its electronics equipment remaining in the avionics bay and cockpit and the passenger compartment was essentially intact. A simulated avionics box was placed...
Topics: DTIC Archive, Hatfield, Michael O, NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA, *AVIONICS,...
The radiating aperture of a circularly polarized, active electronically scanned array (AESA) that operates from 20 GHz to 60 GHz and scans up to 60 from broadside is reported. Design guidelines for wideband arrays are briefly reviewed, and the linearly-polarized connected Vivaldi array is chosen as the radiating element due to its simplicity in design and fabrication. Infinite array simulations are used to characterize the performance of a linear-to-circular polarizer placed on top of a...
Topics: DTIC Archive, Pfeiffer,Carl R, Defense Engineering Corporation Beavercreek United States,...
Topics: DTIC Archive, JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *FOREIGN POLICY,...
The LCC36A (Interface Control and Codec Unit) has two Control and Interface Processor (CIP) cards. These cards have been redesigned to be identical with respect to the hardware. Only the software will distinguish between the uplink CIP and the downlink CIP.
Topics: DTIC Archive, M/A-COM LINKABIT INC SAN DIEGO CA, *COMPUTER COMMUNICATIONS, *SATELLITE NETWORKS,...
Presented are the proceedings of the 12th Annual Electronics Manufacturing Seminar, held on 17-19 February 1988 at the Naval Weapons Center, China Lake, CA.
Topics: DTIC Archive, NAVAL WEAPONS CENTER CHINA LAKE CA, *ELECTRONICS, *INSPECTION, *SOLDERED JOINTS,...
Aerospace electronic boards require special attention to thermal management due to constraints such as their need to be light, small, and maintain high power densities. Also, cooling is mainly through conductive and radiative modes with minor or negligible convective cooling. Due to these particular requirements, thermal design has become an integrated part of the electronic design process in order to avoid expensive repeat prototyping and to ensure high reliability. To achieve high speed...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT BOARDS, COMPUTER AIDED DESIGN, COMPUTER PROGRAMS,...
The Wave Propagation Lab. has completed the design and construction of a microprogrammable radar controller for atmospheric wind profiling. Unlike some radar controllers using state machines or hardwired logic for radar timing, this design is a high speed programmable sequencer with signal processing resources. A block diagram of the device is shown. The device is a single 8 1/2 inch by 10 1/2 inch printed circuit board and consists of three main subsections: (1) the host computer interface;...
Topics: NASA Technical Reports Server (NTRS), CONTROL EQUIPMENT, MICROPROGRAMMING, SIGNAL PROCESSING, WIND...
Active flow control of boundary-layer separation using glow-discharge plasma actuators is studied experimentally. Separation is induced on a flat plate installed in a closed-circuit wind tunnel by a shaped insert on the opposite wall. The flow conditions represent flow over the suction surface of a modem low-pressure-turbine airfoil. The Reynolds number, based on wetted plate length and nominal exit velocity, is varied from 50,000 to 300,000, covering cruise to takeoff conditions. Low (0.2%)...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, GLOW DISCHARGES, PLASMAS (PHYSICS), ACTIVE...
The Internal Discharge Monitor (IDM) was designed to observe electrical pulses from common electrical insulators in space service. The sixteen insulator samples included twelve planar printed circuit boards and four cables. The samples were fully enclosed, mutually isolated, and space radiation penetrated 0.02 cm of aluminum before striking the samples. Pulsing began on the seventh orbit, the maximum pulse rate occurred on the seventeenth orbit when 13 pulses occurred, and the pulses slowly...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT BOARDS, ELECTROMAGNETIC PULSES, EXTRATERRESTRIAL...
Space is a harsh environment, full of high-energy radiation that can cause single-event effects (SEE) in orbiting satellites. Some of these effects, such as single-event upsets and single-event functional interrupts, occur when ionizing radiation causes the logical value in a memory element to change and are detectable and correctable through various error mitigation techniques. In this thesis, we develop and implement a hardware solution to combat these SEE for deployment as an experimental...
Topics: DTIC Archive, Jackson,Andrew S, Naval Postgraduate School Monterey United States, FAULT TOLERANT...
Topics: DTIC Archive, Case, Steven, VIA INC NORTHFIELD MN, *MICROCOMPUTERS, CIRCUIT BOARDS, RESEARCH...
The use of submodeling in a finite element model for structure response is investigated for a simple structure representative of an electronic circuit board subjected to projectile launch conditions. The basic technique and rationale for submodeling are discussed. The consequences of sampling rate when one is using the global model's response as input for the local model's response are also highlighted. Additionally. the effect of submodeling in introducing artificial high frequency response is...
Topics: DTIC Archive, Powers, Brian M, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *FINITE ELEMENT...
We performed a time-dependent simulation of thermal transfer in a circuit board, comparing the effects of using four different die-attach materials with high-power silicon carbide diodes. This simulation attempted to reproduce the results of a laboratory experiment in which thermal measurements were made of circuit boards under a time-varying load.
Topics: DTIC Archive, Ovrebo, Gregory K, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES...
Manufacturers are constantly developing increasingly miniature, ferroelectric multi-layer ceramic capacitors, survivable under progressively harsher mechanical stresses. However, the piezoelectric response of the bulk Barium Titanate- based dielectric in such capacitors has not yet been addressed for shocks above 3,000 g. Thus, the current research developed a finite element capacitor model and modified an established constitutive relationship to calculate the capacitive response under high-g...
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF...
A microelectromechanical direction-finding sensor has been developed based on the mechanically coupled ears of the Ormia ochracea fly. Previous designs determined the direction of sound relative to the normal of the sensor by using the sound pressure level at the sensor. However, these designs suffered from a left-right ambiguity. To overcome these shortcomings, a dual sensor assembly was created. Two sensors co-located at an offset angle allow direction finding across 120 deg. This eliminated...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ACOUSTIC DETECTORS, *DIRECTION FINDING,...
Drone technology has catapulted to the forefront of military and private sector research. Of particular interest are unmanned aerial systems that are able to stay airborne for extended periods by absorbing energy from the environment. This requires extreme aerodynamic efficiency in order to minimize the power required to maintain flight, and a recognition that every sub-system in this system of systems must operate at optimal levels in order to achieve this nearly perpetual flight. A critical...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DRONES, *SOLAR ENERGY, AERODYNAMICS, ANALOG...
From the bitsavers.org collection, a scanned-in computer-related document. intel :: system3xx :: 173211-002 310inst Jun84
Topics: system, intel, diskette, fuse, mounting, connector, power, terminal, operating, installation, power...
Rosin-based and non-rosion fluxes were tested for ionic cleanliness after processing in one of three systems: solvent vapor degreasing, in-line aqueous cleaning, or a combination of solvent vapor degreasing followed by a deionized water rinse. Solvents containing a large percentage of alcohol gave the best ionic cleanliness for event the most difficult to remove rosin-based fluxes. Water alon cannot remove non-rosin flux residue. Detergents removed ionic contamination from the rosin, mildly...
Topics: DTIC Archive, Sanger,Donna, NAVAL WEAPONS CENTER CHINA LAKE CA, *SOLVENTS, *CLEANING, *PRINTED...
Electromechanica Inc. was tasked with researching and developing a proof of concept robot tool for in-situ pipe inspection of fleet piping. Electromechanica has designed and fabricated a proof of concept robot tool based on a pneumatically actuated peristaltic motion. This motion is accomplished by the use of inflatable pneumatic grippers, as well as a novel flexible pneumatic cylinder capable of actuation in a variety of articulated positions. Various representative piping systems were used to...
Topics: DTIC Archive, ELECTROMECHANICA INC MATTAPOISETT MA, *INSPECTION, *PIPES, *ROBOTS, COMPUTER...
With the complexity of digital systems, reliability considerations are important. In many digital systems it is desirable to continuously monitor, exercise, and test the system to determine whether it is performing as desired. Such monitoring may enable automatic detection of failures via periodic testing or through the use of codes and checking circuits (e.g., built-in self-testing). While any complex system requires testing to ensure satisfactory performance, satellite systems require...
Topics: DTIC Archive, Hulme, Charles A, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DIGITAL SYSTEMS, *SPACE...
The Naval Postgraduate School's first CubeSat, the NPS Solar Cell Array Tester (NPS-SCAT), demonstrates the capability of the CubeSat form factor as a technology test bed by implementing a single experiment-a solar cell tester. The need to validate solar cell performance on orbit, in the harsh space environment, is recurring with the continued development of advanced, untested solar cells. By using a relatively inexpensive platform, the CubeSat, such solar cells can be tested and the risk for...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *SYSTEMS ENGINEERING, *SOLAR CELLS, SPACE...
The goal of this research effort is to implement dynamically-tuneable Electromagnetic BandGap (EBG) circuits for filtering in an integrated circuit (IC) fabrication processes leveraging a technique previously developed for Printed Circuit Board (PCB).
Topics: DTIC Archive, MACQUARIE UNIV SYDNEY (AUSTRALIA), *BAND GAPS, *ELECTROMAGNETIC PROPERTIES,...
The harsh radiation environment of space, the propensity for SEUs to perturb the operations of a silicon based electronics, the rapid development of microprocessor capabilities and hence software applications, and the high cost (dollars and time) to develop and prove a system, require flexible, reliable, low-cost, rapidly-developed system solutions. Consequently, a reconfigurable Triple Modular Redundant (TMR) System-on-a-Chip (SOC) utilizing Field Programmable Gate Arrays (FPGAs) provides a...
Topics: DTIC Archive, Ebert, Dean A, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *SPACE ENVIRONMENTS, *COMPUTER...
This report addresses the current uses of field programmable gate arrays (FPGAs) and their potential for use in high performance computing (HPC). FPGAs are devices programmed using languages and methodologies originally developed for describing the circuit layouts used in today's integrated circuits. As such, they are well suited for applications involving bit manipulations performed on a continuous stream of data. However, their general applicability to HPC applications is open to debate. This...
Topics: DTIC Archive, Pressel, Daniel M, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPUTER...
Proceedings of 8th annual seminar.
Topics: DTIC Archive, NAVAL WEAPONS CENTER CHINA LAKE CA, *SOLDERING FLUXES, *SOLDERED JOINTS, *SOLDERING,...
This is a study of the Low Cycle Fatigue of Chip Carrier/Printed Wiring Board joints tested at -55 C and +125 C. It differs from a previous study where the joints were tested at 35 C. The hysteresis loops were distorted. The slopes of the displacement vs. fatigue life curves were slightly lower and the fatigue lives were longer. These differences were especially significant when the change in joint resistance was used to define failure.
Topics: DTIC Archive, Solomon, H D, MARTIN MARIETTA CORP ORLANDO FL, *PRINTED CIRCUIT BOARDS, *JOINTS,...
This report documents technical support provided to AFGL's Atmospheric Optics Branch. Specific tasking areas in this contract include the following: System integration; Testing; Field support; Printed circuit board fabrication; Analysis and design; Documentation. Keywords: radiosondes; Thermosondes; Atmospheric sounding; Balloon payloads; Systems engineering; Fabrication; Optical turbulence.
Topics: DTIC Archive, Regan, Frank C , Jr, SYSTEMS INTEGRATION ENGINEERING INC LEXINGTON MA, *ATMOSPHERIC...
The system that we have developed convincingly demonstrates the technology required to: manage complex user requests within the context of a large tool suite; allow users to obtain instruction about how to make complex requests from the system itself; and easily develop processors for problem oriented specification languages. We have used the system routinely in its own development and in a variety of applications from circuit board layout through robot control to database query specification....
Topics: DTIC Archive, Heuring, Vincent P, COLORADO UNIV AT BOULDER DEPT OF ELECTRICAL AND COMPUTER...
The MRS symposium on In-Situ Patterning: Selective Area Deposition and Etching brought together a wide selection of microfabrication technologies and detailed studies of their enabling mechanisms. The common thread through the invited and contributed papers is the chemical and/or physical alteration of surfaces by the actions of ion, electron, or photon energy. The applications ranged from state-of-the-art lithographic techniques, to direct processing of semiconductor surfaces, aiming to...
Topics: DTIC Archive, Ballance, Joan B, MATERIALS RESEARCH SOCIETY PITTSBURGH PA, *ETCHING,...
The Naval Postgraduate School possesses software designed to perform thermal analysis of electronic components. At the core of this package is a model builder whose purpose is to generate a thermal model for use in steady state and transient thermal analyzers. The current version of the model builder requires excessive amounts of time for data input and model verification. This thesis describes the development of a model builder specifically designed to reduce the time required to model a...
Topics: DTIC Archive, Glaser, Stephen J, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *THERMAL PROPERTIES, DATA...
This is the final report for the Rapid Prototyping of Applications Specific Signal Processors (RASSP) Program - Study Phase. This study represents a five-month contract effort, DARPA contract number MDA972-92-C-0057, performed by Honeywell's Systems and Research Center for the Defense Advanced Research Projects Agency, DARPA. The Broad objective of this study was to produce information that would aid the Government program manager to manage the risks inherent in the implementation phase of the...
Topics: DTIC Archive, Malver, Fred, HONEYWELL SYSTEMS AND RESEARCH CENTER BLOOMINGTON MN, *SIGNAL...
