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Jul 13, 2019
07/19
by
Brown, George H. (George Harold), 1908-
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xiv, 370 p. : 24 cm
Topic: Induction heating
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201
May 19, 2019
05/19
by
FRANK CURTIS
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260 PG. OF CLASSIC MACHINE DESIGN AND FABRICATION. HEAT TREATING,WELDING,DIELECTRIC HEATING,AND MUCH MORE.
Topics: INDUCTION HEATING, TEMPERING, WELDING, DIELECTRIC, HEAT TREAT
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This paper deals with implementation of a multi-output Series Resonant Inverter(SRI) for induction heating applications, which uses pulse density modulation(PDM) control for full bridge Series resonant inverters for output voltage and power control. It ensures better efficiency performances than conventional control strategies. The proposed converter can be considered as a two output extension of a full bridge inverter. This full bridge inverter can control the two outputs, simultaneously and...
Topics: Induction heating, PDM control, Resonant inverters, Series resonant inverter
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The Proportional-Integral-Derivative (PID) controller is the most popular control strategy in the process industry. The popularity can be attributed to its simplicity, better control performance and excellent robustness to uncertainties that is found through the research work on such controllers so far. This paper presents the design and tuning of a PID controller using Fuzzy logic for industrial induction heating systems with LLC voltage source inverter for controlling the induction heating...
Topics: Fuzzification, Fuzzy PID controller, Induction heating, LLC, Voltage source inverter
717
717
Sep 20, 2010
09/10
by
Dyall, Kenneth G
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Dirac-Hartree-Fock calculations have been carried out on the ground states of the group IV monoxides GeO, SnO and PbO. Geometries, dipole moments and infrared data are presented. For comparison, nonrelativistic, first-order perturbation and relativistic effective core potential calculations have also been carried out. Where appropriate the results are compared with the experimental data and previous calculations. Spin-orbit effects are of great importance for PbO, where first-order perturbation...
Topics: ELASTOMERS, FLEXIBLE BODIES, HEATING EQUIPMENT, INDUCTION HEATING, MANUFACTURING, CAPACITORS,...
Topics: DTIC Archive, SOUTHAMPTON UNIV (UNITED KINGDOM), *OPTOELECTRONICS, INDUCTION HEATING, MODULATORS,...
153
153
Jul 13, 2010
07/10
by
Rowan, Henry M; Smith, John Calhoun
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Topics: Rowan, Henry M, Inductotherm Industries Incorporated (U.S.), Induction furnaces, Induction heating,...
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This paper presents different techniques on fault diagnosis in static converters used to supply and control induction heating systems. These techniques allow the detection and the location of the failed semiconductor switches. After an overview of the device with its main features in healthy state, we have afterwards focused on the fault detection and diagnosis in three electronic power converters which constitute the power generator of the induction furnace. For uncontrolled three-phase...
Topics: Induction heating systems, Static converters, Fault detection and diagnosis, Spectrum analysis,...
Topics: DTIC Archive, JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *SYMPOSIA, *HEAT TREATMENT,...
Evaporation by induction heating produces significant degree of metal ionization, enhancing degree of penetration of evaporant on substrate.
Topics: NASA Technical Reports Server (NTRS), ELECTROPLATING, EVAPORATION, GAS-METAL INTERACTIONS,...
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Conference on technological concepts for future transport aircraft developments in civil aviation
Topics: INDUCTION HEATING, PERFORMANCE TESTS, THERMAL REACTORS, THERMAL SIMULATION, THERMIONIC CONVERTERS,...
Induction heating technology, a magnetic non-deforming process, was developed by Langley researchers to join plastic and composite components in space. Under NASA license, Inductron Corporation uses the process to produce induction heating systems and equipment for numerous applications. The Torobonder, a portable system, comes with a number of interchangeable heads for aircraft repair. Other developments are the E Heating Head, the Toroid Joining Gun, and the Torobrazer. These products perform...
Topics: NASA Technical Reports Server (NTRS), HEATING EQUIPMENT, INDUCTION HEATING, TECHNOLOGY UTILIZATION,...
Methods for producing separable tube joints, other than mechanical, were investigated for application of these joints to the M-1 engine lines. The induction process was selected for brazing the separable tube connectors. Special plier-type induction brazing tools were made to permit the brazing of M-1 thrust chamber transition tube joints to the fuel torus. An 82% gold-18% nickel brazing alloy was used with a brazing temperature range of 1900 deg F to 1950 deg F. The tubes and sleeves in this...
Topics: DTIC Archive, Hunt, V, AEROJET-GENERAL CORP SACRAMENTO CA, *BRAZED JOINTS, ENGINE COMPONENTS, HIGH...
The MOS-Controlled Thyristor is a new type of power switching device for faster and more efficient control and management of power electronics. It enables power electronic switching at frequencies of 50 to 100 thousand times a second with much lower power losses than other semiconductor devices. Advantages include electric power savings and smaller space. The device is used in motor and power controllers, AC & DC motor drives and induction heating. Early development was supported by Lewis...
Topics: NASA Technical Reports Server (NTRS), SWITCHING CIRCUITS, THYRISTORS, CONTROLLERS, SEMICONDUCTOR...
A control system for a thermal stir welding system is provided. The control system includes a sensor and a controller. The sensor is coupled to the welding system's containment plate assembly and generates signals indicative of temperature of a region adjacent and parallel to the welding system's stir rod. The controller is coupled to the sensor and generates at least one control signal using the sensor signals indicative of temperature. The controller is also coupled to the welding system such...
Topics: NASA Technical Reports Server (NTRS), WELDING, TEMPERATURE CONTROL, CONTROLLERS, INDUCTION HEATING,...
Accutron Tool & Instrument Co.'s welder was originally developed as a tool specifically for joining parts made of plastic or composite materials in any atmosphere to include the airless environment of space. Developers decided on induction or magnetic heating to avoid causing deformation and it also can be used with almost any type of thermoplastic material. Induction coil transfers magnetic flux through the plastic to a metal screen that is sandwiched between the sheets of plastic to be...
Topics: NASA Technical Reports Server (NTRS), INDUCTION HEATING, AEROSPACE INDUSTRY, WELDING MACHINES,...
Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.
Topics: DTIC Archive, Concordia, David, *CYLINDRICAL BODIES, *FORGING, *HEAT TRANSMISSION, *INDUCTION...
Induction heating is introduced as an evaporation heat source in ion plating. A bare induction coil without shielding can be directly used in the glow discharge region with no arcing. The only requirement is to utilize an rf inductive generator with low operating frequency of 75 kHz. Mechanical simplicity of the ion plating apparatus and ease of operation is a great asset for industrial applications; practically any metal such as nickel, iron, and the high temperature refractories can be...
Topics: NASA Technical Reports Server (NTRS), INDUCTION HEATING, PLATING, PROTECTIVE COATINGS, PERFORMANCE...
101
101
Apr 27, 2018
04/18
by
Ziff-Davis Publishing Company
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RADIO-ELECTRONIC ENGINEERING is published each month as a special edition in a limited number of copies of RADIO NEWS, by the Ziff-Davis Publishing Company, 185 N. Wabash Avenue, Chicago 1, Illinois.
Topics: Radio News, Loudspeakers, Television Tubes, Waveform Generator, Watt-Hour Meter Power Integrator,...
The rf-excited coil in the presence of a plasma is examined in terms of a transformer model and also in terms of the distortion of the electromagnetic fields which is produced by the induced eddy-currents in the plasma. The treatment of rf coils presented here can be applied to either the plasma diagnostics regime or to the generation of the rf electrodeless discharge. Although the calculations of the electric and magnetic fields in this report are for a cylindrically symmetric coil immersed in...
Topics: DTIC Archive, Sprouse, J A, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *SOLENOIDS, COILS,...
The purpose of this work was to determine the feasibility of a new idea for applying rotating bands to projectiles. The idea is the in-situ fusion of the rotating band material in a graphite crucible fitted around the projectile. Various heating and shielding methods were explored. It was found that several materials could be successfully deposited using induction or furnace heating in an Argon atmosphere. Metallographic studies and post- application, heat treating studies were carried out....
Topics: DTIC Archive, Schillinger, David E., FRANKFORD ARSENAL PHILADELPHIA PA, *ROTATING BANDS,...
A large Class C oscillator, which is intended to be a power source for induction heating of gases, has been built. The oscillator uses eight triode vacuum tubes in a push-pull parallel configuration and is capable of a continuous power output of 3.2 MW at frequencies between 10 and 50 kHz. The report describes in detail the design of the oscillator, its auxiliary equipment, and its protective devices. The report is not intended as an operating manual; rather, it is intended to give the reader...
Topics: DTIC Archive, Cunningham, J W, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *INDUCTION...
A method was developed for producing thermal stress failure in ATJ-S graphite and the initial results are described. Test specimens are 10-cm-long hollow cylinders with outer and inner radii of 1.9 and 0.4 cm, respectively. The outside is heated by induction at a frequency of 1.4 MHz by a 100-kW power oscillator; the inside is kept below 100C by forcing water at a rate of 5 gpm through the copper-coated bore. A special lead soldering technique has been developed to fasten the coolant ducts to...
Topics: DTIC Archive, Eckert, Hans U, AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS, *GRAPHITE, HIGH...
Over the past year the Nuclear Thermal Rocket Element Environmental Simulator (NTREES) has been undergoing a significant upgrade beyond its initial configuration. The NTREES facility is designed to perform realistic non-nuclear testing of nuclear thermal rocket (NTR) fuel elements and fuel materials. Although the NTREES facility cannot mimic the neutron and gamma environment of an operating NTR, it can simulate the thermal hydraulic environment within an NTR fuel element to provide critical...
Topics: NASA Technical Reports Server (NTRS), NUCLEAR PROPULSION, THERMAL ENVIRONMENTS, ENVIRONMENT...
This quarterly report contains a feature article titled Coatings Removal Research, Institute Notes, and a Calendar of Events. The feature article contains the following information relevant to environmental technologies: Department of Navy maintenance and repair facilities are in a seemingly unending search for new and better techniques and methodologies for the removal of coatings from vehicles, vessels, and aircraft. As environmental protection and occupational health regulations change, as...
Topics: DTIC Archive, PENNSYLVANIA STATE UNIV STATE COLLEGE APPLIED RESEARCH LAB, *ENVIRONMENTAL...
A methodology for accelerated curing of commercially available room-temperature curing paste adhesives is outlined. Cure kinetics of the adhesive were studied by thermochemical analysis, and degree of cure was related to processing parameters and cure cycles. Increasing the cure temperature to 100 degrees C reduced the cure time from 16 hr to approximately 15 min. for 98% cure. Induction-heating techniques were used to demonstrate rapid heating of adhesives at the bondline for lap shear...
Topics: DTIC Archive, McKnight, Steven H, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPOSITE...
Technique requires radio frequency induction power source, induction furnace and good vacuum system to induce brittle material thermal shock testing.
Topics: NASA Technical Reports Server (NTRS), BRITTLE MATERIALS, FURNACES, INDUCTION HEATING, MECHANICAL...
The problem of estimating a steady fluid velocity field near the top of Earth's core which induces the secular variation (SV) indicated by models of the observed geomagnetic field is examined in the source-free mantle/frozen-flux core (SFI/VFFC) approximation. This inverse problem is non-linear because solutions of the forward problem are deterministically chaotic. The SFM/FFC approximation is inexact, and neither the models nor the observations they represent are either complete or perfect. A...
Topics: NASA Technical Reports Server (NTRS), CORE FLOW, GEOMAGNETISM, INDUCTION HEATING, MAGNETIC EFFECTS,...
Development of techniques for air-induction melting of TRIP steel alloys was investigated. Sound ingots of Type A-2 TRIP steel were produced, processed, and are currently undergoing mechanical testing. Several methods for monitoring martensitic transformation were evaluated. A ferromagnetic technique remains to be appraised. Various homogenization treatments were investigated in order to optimize microstructure prior to thermomechanical processing.
Topics: DTIC Archive, Azrin, Morris, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA, *STEEL,...
An experimental investigation was conducted using 80 kW and 1.2 MW RF induction heater facilities to aid in developing the technology necessary for designing a self-critical fissioning uranium plasma core reactor. Pure uranium hexafluoride (UF6) was injected into argon-confined, steady-state, RF-heated plasmas in different uranium plasma confinement tests to investigate the characteristics of plamas core nuclear reactors. The objectives were: (1) to confine as high a density of uranium vapor as...
Topics: NASA Technical Reports Server (NTRS), CONFINEMENT, EXPERIMENTATION, PLASMA CONTROL, RADIO...
A number of high new oxide glasses have been prepared by a laser-spin melting technique where droplets are ejected from a molten mass. Techniques have been developed for measuring the optical properties of most of the new glasses so produced. A preliminary study of processing equipment for producing new glasses in a zero gravity environment onboard manned space laboratory is reported. Induction and laser melting emerge as preferred techniques for melting spheroids of new glass compositions in...
Topics: NASA Technical Reports Server (NTRS), GLASS, MELTING, PRODUCTION ENGINEERING, WEIGHTLESSNESS,...
Topics: DTIC Archive, Suprunov, V A, JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *CORROSION...
A new in-situ method for applying 'fused on' rotating bands to projectiles has been demonstrated. U. S. Patent No. 3,888,295 of 10 June 1975, has been granted on the method. The new method produces bands which are completely bonded to the projectile wall.
Topics: DTIC Archive, Schillinger, David E., Addison, Jr, Harry J., FRANKFORD ARSENAL PHILADELPHIA PA,...
The Army Research Laboratory is leading research in developing non-autoclave resin curing technologies including a variety of electromagnetic and radiation methods. Recent advances in induction-based electromagnetic bonding have led to several inventions providing enabling technologies for rapid repair of integrated composite structures. Induction-heated bonding of thermoset and thermoplastic polymer matrix composites consists of the heating of a susceptor placed between the parts or of the...
Topics: DTIC Archive, Fink, B. K., ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *CURING, *VEHICULAR ARMOR,...
Topics: DTIC Archive, Bollinger, Loren E., Speiser, Rudolph, Johnston, Herrick L., OHIO STATE UNIV RESEARCH...
We report on the control of cyclotrimerization forming a polycyanurate polymer using magnetic iron oxide nanoparticles in an alternating current (AC) field as an internal heat source, starting from a commercially available monomer. Magnetic nanoparticles were dispersed in the monomer and catalytic system using sonication and the mixture was subjected to an alternating magnetic field, causing the magnetic nanoparticles to dissipate the energy of the magnetic field in the form of heat. Internal...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB EDWARDS AFB CA ROCKET PROPULSION DIV, *CURING, *CYANATES,...
What is TSW and USW? TSW is a solid state weld process consisting of an induction coil heating source, a stir rod, and non-rotating containment plates Independent heating, stirring and forging controls Decouples the heating, stirring and forging process elements of FSW. USW is a solid state weld process consisting of an induction coil heating source, a stir rod, and a non-rotating containment plate; Ultrasonic energy integrated into non-rotating containment plate and stir rod; Independent...
Topics: NASA Technical Reports Server (NTRS), INDUCTION HEATING, SOLID STATE, WELDING, STIRRING, DRILLING,...
Design of glass furnace for analysis of rocks to determine nature and amount of trapped gas is described. Furnace heats specimen in vacuum conditions by radio frequency induction. Diagram of apparatus to show construction and operation is provided.
Topics: NASA Technical Reports Server (NTRS), CHEMICAL ANALYSIS, EQUIPMENT SPECIFICATIONS, GAS ANALYSIS,...
The feasibility of using induction heating and concomitant quenching for hot winding large helical springs was established. A full-scale experimental system was assembled, and M140 gun mount counterrecoil springs were coiled from three different materials. Springs with proper load-carrying capacity were produced from each of the materials.
Topics: DTIC Archive, Williams, Samuel L, ARMY WEAPONS COMMAND ROCK ISLAND IL GENERAL THOMAS J RODMAN LAB,...
Topics: DTIC Archive, Christensen, L M, NORTHROP AIRCRAFT INC HAWTHORNE CA, *STEEL, *EXTRUSION, AUSTENITE,...
Induction melting of titanium alloys using a semi-levitation technique and bottom pouring in graphite crucible was evaluated for four titanium alloys. Ti-6Al-4V, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-8V-6Cr-4Mo-4Zr (Beta C), and Ti-11Mo-4.5Sn-6Zr (Beta 111). Precision investment (lost wax) casting molds coated with pyrolytic graphite were used with the melting technique to make castability, tensile specimen, and bearing housing segment castings. Castability and tensile properties of the alloys were...
Topics: DTIC Archive, Piwonka, Thomas S, TRW INC CLEVELAND OH, *INDUCTION HEATING, *TITANIUM ALLOYS,...
A 25.4-cm long externally configured converter was performance tested by electrically heating the emitter to simulate reactor thermal power input. The measured maximum output power was limited by the maximum input power available from the electric RF induction heater. With maximum heater input power, the converter electric output was 178 W (1.95 W/sq cm) at an emitter temperature of 1946 K. This electric output power was smaller than expected. A reactor-core-length (25.4-cm long) cylindrical...
Topics: NASA Technical Reports Server (NTRS), INDUCTION HEATING, PERFORMANCE TESTS, THERMAL REACTORS,...
The performance of a device for electromagnetically heating and positioning containerless melts during space processing was evaluated during a 360 second 0-g suborbital sounding rocket flight. Components of the electromagnetic containerless processing package (ECPP), its operation, and interface with the rocket are described along with flight and qualification tests results.
Topics: NASA Technical Reports Server (NTRS), CONTAINERLESS MELTS, ELECTROMAGNETISM, ROCKET-BORNE...
This fastener used in induction heating is a wire screen basically of an eddy current carrying material such as carbon steel. Selected wires in the screen are copper, sheathed in an insulating material. The screen is placed between two sheets of thermoplastics. When inductively heated, the composite softens and flows around the apertures of the screen. After this heating and joining, the copper wires may be used to conduct electricity.
Topics: NASA Technical Reports Server (NTRS), FASTENERS, FUSION (MELTING), INDUCTION HEATING, THERMOPLASTIC...
The rate of corrosion of silver by dry chlorine at 600C and one atmosphere pressure was determined to be about one-thousandth of an inch in one hundred hours, a figure sufficiently low to make the use of silver apparatus in the halide reduction process entirely feasible. Several models of silver chloride valvesevllves were constructed and tested. Difficulties in operation rendered this type valve impractical, and it was decided to control the flow of reactant vapors by adjusting helium...
Topics: DTIC Archive, ALLOYD RESEARCH CORP WATERTOWN MA, *DUCTILITY, *BERYLLIUM, CORROSION, SODIUM,...
Improvement of the operating characteristics of rolling-element bearings was sought through development and implementation of MEMS (Micro Electro-Mechanical System) based strain sensors. The strain sensors developed in this program employ a piezoresistive transducer to convert changes in applied strains to output voltages with an on-chip temperature detector compensating for thermal effects in the strain measurement. Bonding of MEMS strain sensors to application substrates was accomplished with...
Topics: DTIC Archive, TIMKEN CORP CANTON OH, *ROLLER BEARINGS, CHIPS(ELECTRONICS), SUBSTRATES,...
The United States and other countries face the problem of waste disposal in an economical, environmentally safe manner. A widely applied solution adopted by Americans is "waste to energy," incinerating the refuse and using the steam produced by trash burning to drive an electricity producing generator. NASA's computer program PRESTO II, (Performance of Regenerative Superheated Steam Turbine Cycles), provides power engineering companies, including Blount Energy Resources Corporation of...
Topics: NASA Technical Reports Server (NTRS), WASTE DISPOSAL, GENERATORS, ENERGY CONSERVATION, STEAM...
An improved promoted-combustion system has been developed for studying the effects of elevated temperatures on the flammability of metals in pure oxygen. In prior promoted-combustion chambers, initial temperatures of metal specimens in experiments have been limited to the temperatures of gas supplies, usually near room temperature. Although limited elevated temperature promoted-combustion chambers have been developed using water-cooled induction coils for preheating specimens, these designs...
Topics: NASA Technical Reports Server (NTRS), COMBUSTION CHAMBERS, FLAMMABILITY, HEATING, METALS, OXYGEN,...
A novel susceptor concept for metal-mesh susceptors, designed to achieve uniform in-plane temperatures during induction heating, is documented. The process involves redirecting eddy-current flow patterns in the resistive-mesh susceptor by specifically designed cut patterns in the mesh. A theoretical model was developed to predict heat generation in metal-mesh susceptors with any described network pattern. initial results for cut patterns show significant changes in heating compared to an uncut...
Topics: DTIC Archive, Fink, Bruce K, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPOSITE MATERIALS,...
Four vacuum arc remelt (VAR) process variations commercially available for the production of high-strength steel were statistically compared in terms of smooth and notch tensile test data developed from transverse and longitudinal specimens removed from 10-in. RCS press-forged billets. Of the four processes, (1) air melt- VAR, (2) air melt-degas-VAR, (3) air melt-double VAR, and (4) vacuum induction melt-VAR, in vestigated at a 300 Ksi ultimate strength level, the vacuum induction melt-VAR...
Topics: DTIC Archive, Truszynski, Joseph C, LADISH CO CUDAHY WI, *TENSILE STRENGTH, *HIGH STRENGTH ALLOYS,...
