This volume was digitized and made accessible online due to deterioration of the original print copy.
Topics: Time-series analysis, Variable speed drives--Mathematical models, Farm tractors--Energy...
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The objective of this study is to develop and research a new method of reactive power compensation in industrial grid via high-power adjustable speed drives (HP ASDs) with medium voltage (MV) three level neutral point clamped back-to-back (3L-NPC BtB) converters. The article is concerned with the mathematical description, control system designing and obtaining of experimental results. An important advantage of the new method is that specialized equipment is not necessary for its implementation....
Topics: AC-DC power converters, DC-AC power converters, Medium voltage, Reactive power control, Variable...
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This paper presents a hybrid pulse width modulation (HPWM) strategy based on different switching patterns of selective harmonic elimination pulse width modulation (SHEPWM) for the three-level neutral point clamped (3L-NPC) converter. Specific low-order harmonics can be eliminated by SHEPWM at low switching frequency, while the remaining high-order harmonics can be selected to be simply filtered by additional hardware. Large oscillation waveform usually occurs in the transition instant between...
Topics: AC-DC power converters, DC-AC power converters, Medium voltage, Reactive power control, Variable...
This paper proposes two model reference adaptive PF (PDF) speed control methods for servo drives. Following from the structure (PF‐type) of model reference parameter adaptive control was developed to provide constant loop gain in speed control loop with changing gain (moment of inertia and/or torque factor) which makes it easier to reach nonovershooting step response as well as fast speed changing compensation caused by jump in load. The algorithm even keeps its stability at fast changing,...
Topics: Adaptive Control, Adjustable Speed Drives, Motion Control, Pseudo‐Derivative Feedback, Servo...
This report covers designing, building and testing of a variable speed fan drive. Speed control automatic from 0 to approximately 4900 rpm governed by engine coolant temperature. Unit includes a fail safe device which operates the fan at maximum speed in the event of a control failure. Unit also includes a deepwater fording switch to reduce fan speed when engine compartment is flooded. Direction of rotation is counter-clockwise viewed from output end. Tests performed on unit included a...
Topics: DTIC Archive, Ressler, H E, LIQUID DRIVE CORP HOLLY MI, *VARIABLE SPEED DRIVES, FANS, ROTATION,...
Topics: DTIC Archive, Toth, John L, AMERICAN SCIENTIFIC CORP ALEXANDRIA VA, *TAPE RECORDERS, DRIVES,...
This First Annual Report summarizes the activities performed on this grant from August 1, 1998, until April 30, 1999. Detailed technical reports will be written once that a specific topic or task has been completed. We were informed by late March 1998 that the Office of Naval Research decided to fund our grant with a starting date of May 1, 1998. We assembled the research team by August 1998 since we were able to hire all graduate students by the fall 1998 semester. Graduate students normally...
Topics: DTIC Archive, Carlos, Juan, ARKANSAS UNIV FAYETTEVILLE DEPT OF ELECTRICAL ENGINEERING, *ELECTRIC...
A matrix converter and variable-speed diesel generator are integrated to create a three-phase utility power supply. The matrix converter is designed to meet tight harmonic and transient response requirements while allowing variable voltage and frequency input from the generator's permanent magnet alternator. This enables the generator to provide stable power over a range of engine speeds and load conditions. Test results for the 10 kW offline power supply are provided to demonstrate system...
Topics: DTIC Archive, Katsis, Dimosthenis, ARMY RESEARCH LAB ADELPHI MD, *BATTLEFIELDS, *POWER SUPPLIES,...
The dynamics equations of a spacecraft consisting of two bodies mutually rotating around a common gimbal axis are derived by the use of the Newton Euler approach. One of the bodies contains a cluster of single-gimbal variable-speed control moment gyros. The equations include all of the inertia terms and are written in a general form, valid for any cluster configurations and any number of actuators in the cluster. A guidance algorithm has been developed under the asassumptionhat the two bodies...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ATTITUDE CONTROL SYSTEMS, *GYROSCOPES,...
This TechData Sheet is intended to help activity personnel identify cost effective energy projects for energy projects for Adjustable Speed Drives (ASDs). With this guide an energy manager can identify when an ASD is applicable and do a first-run evaluation of the project payback.
Topics: DTIC Archive, Leitherer, Art, NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA,...
An HMPT-500 hydromechanical power train was designed for the requirements of a MICV-type vehicle. To satisfy performance and design specifications, an entirely new design concept using only two pairs of hydraulic elements instead of three was developed. This power train differed from previous General Electric units in that reverse and low forward speeds use hydrostatic drive with the more efficient hydromechanical drive being employed for higher forward speed. The control system for the...
Topics: DTIC Archive, Northup, Robert P., GENERAL ELECTRIC CO PITTSFIELD MA ORDNANCE SYSTEMS DEPT, *COMBAT...
Many proposals for future power systems for warships are extant. Anticipated improvements in capability operating economy, and signature reduction may not be uniquely associated with these power systems. Alternatives are available for constructing variable speed drives and prime movers for ships with electric drives. These alternatives may open new design possibilities.
Topics: DTIC Archive, NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD, *NAVAL VESSELS(COMBATANT),...
This memo records the design and testing of a small positive displacement feedwater pump required in connection with experiments on steam atomisation. The pump is of four cylinder radial type direct coupled to a variable speed drive. The design flow rate of 20 litres per hour at 1400 kPa was satisfactorily achieved with minimal pulsing. (Author)
Topics: DTIC Archive, Dyett,D, AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), *FEED PUMPS, TEST AND...
The period of performance for this research award was from August 2000 to January 2004. The main objective of this research was to support the Air Force efforts in the development of an Integrated Power and Attitude Controls System (IPACS) for spacecraft applications. An IPACS will combine the attitude control and power distribution subsystems onboard a spacecraft reducing the bus mass, and thus leading to increased payload. Several options for IPACS have been investigated in this work...
Topics: DTIC Archive, Tsiotras, Panagiotis, GEORGIA INST OF TECH ATLANTA SCHOOL OFAEROSPACE ENGINEERING,...
In November of 1952, representatives of du Pont's Atomic Energy Division had preliminary conversations with various Argonne people concerning a movable neutron chamber for the Savannah River developmental reactor. The usefulness of such a flux measuring instrument had been demonstrated during ZPR-II experiments at Argonne. The ZPR-II facility made provisions for probing along both horizontal and vertical axes. Separate but functionally similar probes were used for each axis: an ion chamber at...
Topics: DTIC Archive, Uecker, D. F., ARGONNE NATIONAL LAB IL, *IONIZATION CHAMBERS, *NEUTRON FLUX, COAXIAL...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Project No. 1 is all of the recommended ECO's combined for the chilled water system in the North area, which is controlled and supplied from Building 25910. The attached project drawing shows an upgrade and general layout of equipment, showing the reuse of the existing cooling towers with new piping from them which will go through a free cooling heat exchanger. There will be pumps at each chiller that will extract the required amount of cooling water through a loop piping arrangement. Chillers...
Topics: DTIC Archive, HARRISON AND SPENCER INC MACON GA, *COST ANALYSIS, *ENERGY CONSERVATION, EFFICIENCY,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
Manufacturing processes and techniques were developed to produce in larger volume a portable air driven variable speed fiber optic cable polisher with the necessary characteristics to perform in the operational environments encountered during installation and maintenance of fiber optic cables in military aircraft. (Author)
Topics: DTIC Archive, Flores,A, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *AIRCRAFT EQUIPMENT, *POLISHING,...
The purpose of the device is to convert unidirectional torque of constant speed (such as from a steam turbine prime mover) into variable speed output torque in either the forward or reverse directions. The concept offers an efficient, lightweight low volume design with potential application over a wide range of speeds and power ratings in the range from hundreds to tens of thousands of horsepower. This machine concept can be applied to commercial and military advanced concept vehicles for both...
Topics: DTIC Archive, Mole, C J, WESTINGHOUSE ELECTRIC CORP CHESWICK PA ELECTRO-MECHANICAL DIV, *MARINE...
The program is for the research and development of a new mechanical power transmission concept: the segmented magnet homopolar torque converter. The purpose of this device is to convert unidirectional torque of constant speed (such as from a steam turbine prime mover) into variable speed output torque in either the forward or reverse directions. The concept offers an efficient, lightweight low volume design with potential application over a wide range of speeds and power ratings in the range...
Topics: DTIC Archive, Mole, C J, WESTINGHOUSE ELECTRIC CORP CHESWICK PA ELECTRO-MECHANICAL DIV, *MARINE...
An investigation is made of the feasibility of designing a nonlinear shaft coupling, with zero or very low torsional stiffness at predetermined operating conditions, for helicopter drive trains. The purpose of such a coupling is to isolate torsional vibration and eliminate resonances. It is found that a coupling can be designed to have zero torsional stiffness at high rotational speeds by using the centrifugal force field on connecting links from the driving to the driven flange of the...
Topics: DTIC Archive, Vance, John M, FLORIDA UNIV GAINESVILLE DEPT OF MECHANICAL ENGINEERING, *HELICOPTER...
The design, development and testing of an advanced containment structure for high speed permanent magnet machines is presented. The primary intent of the program was to achieve a reduction in system weight, volume and cost through the use of an improved containment design. A secondary objective was to minimize rotor pole face losses and, thus improve generator efficiency.
Topics: DTIC Archive, Siddiqui, E. U. A., GENERAL ELECTRIC CO BINGHAMTON NY, *CONTAINMENT(GENERAL),...
The pericyclic variable rotor speed drive transmissiion (PVT) is a promising alternative to gear-type main transmission systems. It holds great promise in providing advanced technology features to benefit twenty-first-century rotorcraft drive system upgrades as well as the future Joint Transport Rotorcraft (JTR). As previously mentioned, these upgrades and the JTR have all been identified on DoD technology road maps. Unique PVT basic architecture features such as its pericyclic...
Topics: DTIC Archive, PENNSYLVANIA STATE UNIV STATE COLLEGE APPLIED RESEARCH LAB, *HELICOPTER ROTORS,...
The objectives of this study have been threefold: The identification of each technical obstacle to the operation of current Army RTFLT's at 45 mph over improved surfaces; the definition of system and component modifications that would be required to achieve this performance; and the determination of commercial availability for modified components. The general method of approach consisted of three phases aimed at the above three objectives. In Phase I, Problem Identification, a literature review...
Topics: DTIC Archive, Howland, John S, LITTLE (ARTHUR D) INC CAMBRIDGE MA, *FORKLIFT VEHICLES,...
A microprocessor controlled motor controller feasibility study has been completed by the Charles Stark Draper Laboratory for the U. S. Navy. In addition to verification of the concept of a microprocessor as the controlling element of a motor control system, design goals included the hardware realization of a control algorithm which maximizes system performance by minimizing harmonic, transient and steady state current, and also maximizes system reliability by limiting the stresses and overloads...
Topics: DTIC Archive, Gulovsen,Arthur L, CHARLES STARK DRAPER LAB INC CAMBRIDGE MA, *CONTROL SYSTEMS,...
The work completed under this contract included the design, fabrication, and installation of a Variable Fill Fluid Coupling (VFFC) Fan Drive with Electronic Speed Control into the M113A1E1 Test Rig Vehicle, as well as dynamometer hot room testing of the VFFC in the vehicle. Besides providing the control for modulating fan speed according to coolant temperature, the Electronic Controller (EC) limits the fan speed (overspeed control) to a preset maximum value, regardless of engine speed, and...
Topics: DTIC Archive, Loss, Alan M., FMC CORP SAN JOSE CA ORDNANCE ENGINEERING DIV, *SPEED REGULATORS,...
Future large AF electrical generator channels will be required to operate in parallel to supply single 'large' loads. These channels will be required to use a minimum number of conversion stages to maintain the highest possible efficiency. The EW or other 'large' loads will use power converted directly from the variable speed generator, and only that power required to be 400-Hz will be converted by the V.S.C.F. unit. Redundancy for one generator out condition will be required. The protection...
Topics: DTIC Archive, Hyvarinen, W. E., AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH, *POWER...
As harmonic-drive transmissions find increased use and acceptance among engineers and designers, the demand for an accurate and reliable understanding of harmonic-drive operating behavior becomes great. In my research, I have performed an extensive experimental investigation of harmonic- drive properties such as stiffness, friction, and kinematic error. From my experimental results, I have confirmed that kinematic error appears primarily at frequencies that are multiples of the wave-generator...
Topics: DTIC Archive, Tuttle, Timothy D, MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB,...
The enclosed summaries provide an outline of some of the URI research projects. In addition to these activities, a scientific meeting combining URI scientists and other distinguished vision researchers in the USA and Canada was organized and held at Boston University in Mar 1988. Topics include: Probing cognitive processes through the structure of event-related potentials during learning; A neural network architecture for automatic trajectory formation and coordination of multiple effectors...
Topics: DTIC Archive, Grossberg, Stephen, BOSTON UNIV MA CENTER FOR ADAPTIVE SYSTEMS, *NEUROMUSCULAR...
The program is for the research and development of a new mechanical power transmission concept: the segmented magnet homopolar torque converter. The purpose of this device is to convert unidirectional torque of constant speed (such as from a steam turbine prime mover) into variable speed output torque in either the forward or reverse directions. The concept offers an efficient, lightweight low volume design with potential application over a wide range of speeds and power ratings in the range...
Topics: DTIC Archive, Mole, C J, Arcella, F G, Berkey, E, Boes, D J, Doshi, V B, WESTINGHOUSE ELECTRIC CORP...
Further miniaturization of high-power semi-conductor devices utilizing silicon disks larger than 12 mm. requires major innovations to improve the average thermal impedance and surge capability. The high thermal impedance in existing discrete devices is caused mostly by the dry interfaces necessary to provide stress relief. This report presents a unique approach to solving the dry interface problem. It describes the design, fabrication and evaluation of a smaller, lighter, electrically isolated...
Topics: DTIC Archive, Butler,John W, GENERAL ELECTRIC CO BINGHAMTON NY ARMAMENT AND ELECTRICAL SYSTEMS...
This program was for the research and development of a new mechanical power transmission concept: the segmented magnet homopolar torque converter. The purpose of this device is to convert unidirectional torque of constant speed (such as from a steam turbine prime mover) into variable speed output torque in either the forward or reverse directions. The concept offers an efficient, lightweight low volume design with potential application over a wide range of speeds and power ratings in the range...
Topics: DTIC Archive, Mole, C J, Arcella, F G, Berkey, E, Boes, D J, Doshi, V B, WESTINGHOUSE ELECTRIC CORP...
Mission studies have shown strong potential to reduce in-theater casualties by using high-speed rotorcraft capable of both vertical takeoff and landing (VTOL) and high-speed, high-altitude, long-range cruising. The rotational speed of the prop-rotors on this type of vehicle must be slowed during forward flight to maintain high propulsive efficiency. One approach to meeting this requirement is to use a variable-speed power turbine (VSPT) to drive the prop-rotor. However, power turbines run most...
Topics: DTIC Archive, ARMY RESEARCH LAB CLEVELAND OH, *TURBINES, *VERTICAL TAKEOFF AIRCRAFT, *ROTARY WING...
A description of an automated gas turbine engine simulator, designated the AFAPL engine simulator, and a discussion of the test results obtained from 31 tests using the simulator are presented. The No. 4-5 bearing compartment areas of a J57 turbine engine are used as the basic hardware for the simulator. The simulator is driven by a variable-speed drive system, throught the accessory drive gearbox, providing simulator mainshaft speeds up to 9,120 rmp. Electrical resistance heaters are used to...
Topics: DTIC Archive, Baber,B B, SOUTHWEST RESEARCH INST SAN ANTONIO TX, *SIMULATORS, *GAS TURBINES,...
Naval expeditionary forces of the future will require new, technologically advanced, multi-mission surface combatants. The design philosophy for future surface combatants stresses survivability, efficiency, and modularity through the use of a modern open architecture consisting of commercial off the shelf and dual use systems. An integrated propulsion and electrical power generation system which utilizes advanced, commercially viable power electronics and state of the art control and monitoring...
Topics: DTIC Archive, Mercer, Christopher P., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ELECTRIC POWER...
This program is for the research and development of a new mechanical power transmission concept: the segmented magnet homopolar torque converter. The purpose of this device is to convert unidirectional torque of constant speed (such as from a steam turbine prime mover) into variable speed output torque in either the forward or reverse directions. The concept offers an efficient, lightweight low volume design with potential application over a wide range of speeds and power ratings in the range...
Topics: DTIC Archive, Mole, C J, Arcella, F G, Berkey, E, Boes, D J, Doshi, V B, WESTINGHOUSE ELECTRIC CORP...
The flight time required for a variable-speed homing missile to intercept a zero-acceleration target in two dimensions is determined by assuming that the missile normal acceleration is bang-bang, that is, maximum normal acceleration followed by zero normal acceleration where the switch time which gives intercept is to be determined. For those cases where intercept does not occur in a reasonable time, the flight time which minimizes the miss distance is used. A tangential acceleration profile is...
Topics: DTIC Archive, Hull, Davide G, TEXAS UNIV AT AUSTIN DEPT OF AEROSPACE ENGINEERING AND ENGINEERING...
The U.S. Army Engineer Research and Development Center (ERDC), Construction Engineering Research Laboratory (CERL) was requested to independently assess the heating, ventilation, and air-conditioning (HVAC) system and related controls at Antilles High School, Antilles Consolidated School System, Fort Buchanan, Puerto Rico, and to review a recent proposal to replace the Antilles High School HVAC control system. While the system was found to be well-designed and appropriate for the application,...
Topics: DTIC Archive, Savoie, Martin J, CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL, *ARMY...
