| Intelligent Sensor Modes Enable a New Generation of Machinery Diagnostics and Prognostics |
05 APR 2001 |
10 pages |
| Authors:
Fred M. Discenzo; Kenneth A. Loparo; Dukki Chung; Allen Twarowski; ROCKWELL AUTOMATION CLEVELAND OH
|
 | Compelling economic, competitive, and technological factors are changing the way many companies view machinery maintenance, repair, and overhaul (MRO) activities. This shift toward a new Maintenance Management Paradigm has implications in many areas of the business including manufacturing scheduling, control, finance, inventory, quality. and asset management. Implementation of the new Maintenance Management Paradigm will require three fundamental building blocks. First, is a framework that enables the efficient re-use of best-in-class ... |
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| Instrumented Fiber Optic Tow Cable |
20 MAR 2001 |
10 pages |
| Authors:
Anthony A. Ruffa; Thomas R. Stottlemyer; Peter E. Seaman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An integrated fiber-optic tow cable is described having both optical fibers and armor wires located outside the cable core to avoid high strain on the optical fibers when the cables is under stress during deployment. The optical fibers have integral temperature sensors near the outermost portion in order to measure accurately the temperature of the fluid coming in contact with temperature sensors. A beam of light is shown on the ... |
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| Piston Deceleration System |
14 MAR 2001 |
25 pages |
| Authors:
Nicholas O. Venier; Nicholas Bitsakis; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A piston deceleration system includes an elongated piston shaft having an intermediate stop member and a second stop member formed thereon. A piston member is slidably seated on the elongated shaft between the intermediate tot member and the second stop member. A tank member is provided having a first end surface with first opening and a shaft aperture formed therein and a second end surface having a second opening formed ... |
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| Turbine Engine Control Using MEMS for Reduction of High Cycle Fatigue |
MAR 2001 |
233 pages |
| Authors:
Jinwei Feng; Ricardo Burdisso; Wing Ng; Ted Rappaport; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MECHANICAL ENGINEERING
|
| The research effort presented in this dissertation consists of employing active trailing edge blowing control to reduce the unsteady stator- rotor interaction in a turbofan simulator. Two active flow control systems with different wake sensing approaches are successfully implemented on the engine simulator. The first flow control system utilizes Pitot probes as flow sensors. Use of Pitot probes as sensors is appropriate as a first step toward a more in ... |
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| Water Spray Protection of Machinery Spaces |
MAR 2001 |
83 pages |
| Authors:
Gerard G. Back; Craig L. Beyler; Philip J. DiNenno; Richard Hansen; HUGHES ASSOCIATES INC BALTIMORE MD
|
| This report provides an evaluation of the firefighting capabilities of fixed pressure water spray systems for machinery spaces as described in Regulation 10 of Safety of Life at Sea (SOLAS). The objective of this evaluation was to determine if a system meeting the minimum SOLAS requirement can provide adequate protection of shipboard machinery spaces. To meet this objective, the capabilities and limitations of twelve water spray systems were determined using ... |
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| Testing of Face-Milled Spiral Bevel Gears at High-Speed and Load |
MAR 2001 |
12 pages |
| Authors:
Robert F. Handschuh; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| Spiral bevel gears are an important drive system components of rotorcraft (helicopters) currently in use. In this application the spiral bevel gears are required to transmit very high torque at high rotational speed. Available experimental data on the operational characteristics for thermal and structural behavior is relatively small in comparison to that found for parallel axis gears. An ongoing test program has been in place at NASA Glenn Research Center ... |
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| Torpedo Mounted Dispenser for a Coil of Flex Hose and Control Wire |
20 FEB 2001 |
19 pages |
| Authors:
Stephen F. Oliver; Stanley J. Olson; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A torpedo mounted dispenser for a coil of flex hose and control wire includes a rigid shell round in widthwise cross section, and a circular shock mount disposed centrally of the shell, the shell and the shock mount defining an annular chamber therebetween. Hooks are mounted on an exterior wall of the shell. Slots are defined by the shell, each slot being proximate one of the hooks. A retainer ring ... |
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| Propeller Blade Design Thickness and Blockage Issues Due to Source- Induced Factors |
FEB 2001 |
67 pages |
| Authors:
David S. Hunt; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
|
| A propeller lifting-surface design and analysis program is improved upon by implementing enhancements in the source distribution calculation to represent the blade thickness. It is recognized that the present method of setting the source line distribution representing blade thickness (currently based on linearized slender-body theory for an isolated foil section) may introduce significant errors. This is the case for propulsors with a combination of a large thickness/chord ratio (blockage effect) ... |
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| A Novel Magneto-Rheological Shock Absorber for Vibration Control |
FEB 2001 |
74 pages |
| Authors:
Fararmarz Gordaninejad; NEVADA UNIV RENO
|
| This project focused on the fundamental understanding of behavior and development of novel magneto-rheological fluid (MRF) shock absorbers for mechanical systems. The aim of the study was on the feasibility of integrating controllable, semi-active, MRF shock absorbers in the suspension systems of the U.S. Army's High Mobility, Multi-purpose Wheeled Vehicle (HMMWV). New MRF damper designs were developed, fabricated and tested to meet and exceed the performance criteria set forth by ... |
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| Design, Generation and Tooth Contact Analysis (TCA) of Asymmetric Face Gear Drive With Modified Geometry |
JAN 2001 |
35 pages |
| Authors:
Faydor L. Litvin; Alfonso Fuentes; J. M. Hawkins; Robert F. Handschuh; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| A new type of face gear drive for application in transmissions, particularly in helicopters, has been developed. The new geometty differs from the existing geometry by application of asymmetric profiles and double-crowned pinion of the face gear mesh. The paper describes the computerized design, simulation of meshing and contact, and stress analysis by finite element method. Special purpose computer codes have been developed to conduct the analysis. The analysis of ... |
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| A Class IV Flextensional Device Based on Electrostrictive Poly(vinylidene fluoride-trifluoroethylene) Copolymer |
2001 |
6 pages |
| Authors:
Feng Xia; Q. M. Zhang; Z. -y. Cheng; PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH INST
|
| A class IV flextensional device based on electrostrictive P(VDF-TrFE) copolymers was fabricated and characterized. As an actuator,an produce a displacement of more than 1 mm in air with high load capability. As an underwater transducer the device can be operated at frequencies of several kilohertz with high transmitting voltage response and low mechanical quality factor. Finite element analysis was used to model the flextensional device. The modeling indicates that the ... |
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| Joint Use of Dynamical Classifiers and Ambiguity Plane Features |
2001 |
5 pages |
| Authors:
M. Ostendorf; L. Atlas; R. Fish; O. Cetin; S. Sukittanon; G. D. Bernard; WASHINGTON UNIV SEATTLE DEPT OF ELECTRICAL ENGINEERING
|
| This paper argues for using ambiguity plane features within dynamic statistical models for classification problems. The relative contribution of the two model components are investigated in the context of acoustically monitoring cutter wear during milling of titanium, an application where it is known that standard static classification techniques work poorly. Experiments show that explicit modeling of long-term context via a hidden Markov model state improves performance, but mainly by using ... |
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| Matrix-Assisted Synthesis of Palladium Nanocage and Nanowires |
2001 |
7 pages |
| Authors:
Jinwoo Cheon; Kyung-Bok Lee; Hongkyu Kang; S. J. Oh; H. -C. Ri; KOREA ADVANCED INST OF SCIENCE AND TECHNOLOGY TAEJON
|
| Our study describes the synthesis of novel nanoscale Pd cage and wires whose sizes and shapes are templated by mesoporous matrices. The templates used are cubic phase MCM-48 and hexagonal phase C(sub n)MCM-41 (n = 16, and 22), SBA-15, which have pore diameters of approx.=3, approx.=3.8, approx.=4, approx.=7, and approx.=9 nm, respectively. For PdMCM-48, the Pd metal forms spherical domains (approx.=38 nm) consisting of three dimensionally interconnected into Pd arrays; ... |
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| Engineering Investigation of Failures of Cable Used to Tow the TDU-32A Banner Target from T2C Aircraft |
06 DEC 2000 |
96 pages |
| Authors:
Brent Meeker; NAVAL AIR WARFARE CENTER WEAPONS DIV POINT MUGU CA
|
| Twice in May of 2000, cables used to tow TDU-32A target banners broke while being towed by T2C aircraft of VT-9 flying out of Meridian MS. There had been two similar incidents in the preceding 20 months. In each case the cable broke about thirteen feet aft of the tow point on the aircraft and the banner portion of the cable was not recovered. The breaks occurred or were first ... |
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| A Method for Reducing Strum in Tow Cables |
24 NOV 2000 |
12 pages |
| Authors:
Anthony A. Ruffa; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A method for reducing strum in tow cables. Such tow cables typically extend from a marine vessel and have their lengths controlled by a winch on the deck of the ship and have a tow component at their distal end. The length of the cable is adjusted so that the number of longitudinal waves is an integral number of the number of transverse waves is an odd integral number. |
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| Human Body Modeling as a Human Factors Engineering Tool |
01 NOV 2000 |
7 pages |
| Authors:
Nick Beagley; CENTRE FOR HUMAN SCIENCES HAMPSHIRE (UNITED KINGDOM)
|
| Computer based human body modeling provides a tool with which human factors issues can be assessed early in a system's design . By populating an interactive visualization of a design with representative mannequins issues such as fit, reach and vision can be evaluated and design changes recommended at the concept stage. Body modeling tools are continually advancing, offering increasingly sophisticated dynamic representations of the human operator. For the influence of ... |
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| Umbilical Cable Bonding Tool |
11 OCT 2000 |
15 pages |
| Authors:
Raymond A. St. Amand; Ronald E. Sprague; John H. Pelto; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A bonding tool includes an aluminum metal alloy bar member of a predetermined width, the bar having an upper surface, a lower surface, and opposing longitudinal edges. A resilient material is adhesively joined with the bar, the resilient material having an upper surface, a lower surface and opposing longitudinal edges. The joining of the resilient sponge material to the bar is such that an entire upper surface of the sponge ... |
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| The National Shipbuilding Research Program. Metal Products and Machinery Effluent Limitation Guidelines Phase 2: Detailed Analysis of Proposed Regulation |
02 OCT 2000 |
14 pages |
| Authors:
John L. Wittenborn; Joseph J. Green; COLLIER SHANNON RILL AND SCOTT PLLC WASHINGTON DC
|
| In late July, the U.S. Environmental Protection Agency ("EPA" or "the Agency") submitted proposed effluent limitation guidelines ("ELGs") for the metal products and machinery ("MP&M") industrial sector to the Office of Management and Budget ("OMB") for review prior to submission to the EPA Assistant Administrator for Water for signature and subsequent publication in the Federal Register. The proposal is expected to be signed in late October. Publication -- the official ... |
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| Computerized Generation and Simulation of Meshing and Contact of New Type of Novikov-Wildhaber Helical Gears |
OCT 2000 |
53 pages |
| Authors:
Faydor L. Litvin; Pin-Hao Feng; Sergei A. Lagutin; ILLINOIS UNIV AT CHICAGO
|
| In this report, we propose a new geometry for low-noise, increased- strength helical gears of the Novikov- Wildhaber type. Contact stresses are reduced as a result of their convex-concave gear tooth surfaces. The gear tooth surfaces are crowned in the profile direction to localize bearing contact and in the longitudinal direction to obtain a parabolic function of transmission errors. Such a function results in the reduction ... |
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| Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbomachinery Applications |
OCT 2000 |
19 pages |
| Authors:
Christopher D. Corte; Mark J. Valco; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| This paper introduces a simple 'Rule of Thumb' (ROT) method to estimate the load capacity of foil air journal bearings, which are self-acting compliant-surface hydrodynamic bearings being considered for Oil-Free turbomachinery applications such as gas turbine engines. The ROT is based on first principles and data available in the literature and it relates bearing load capacity to the bearing size and speed through an ... |
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| Turbulence and Complex Flow Phenomena in Axial Turbomachines |
SEP 2000 |
32 pages |
| Authors:
Joseph Katz; Charles Meneveau; JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICAL ENGINEERING
|
| The objective of this project is to measure the flow within turbomachines, and use the data for addressing relevant turbulence-modeling issues. A unique two-stage, axial turbomachine test facility has been constructed. It contains liquid (66% NaI, 34% H2O) with an optical index of refraction that matches that of the acrylic blades of the second stage. Consequently, it allows unobstructed view on the flow within the rotor, stator and the gap ... |
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| Axially Pressure Balanced Floating Seal System |
28 AUG 2000 |
23 pages |
| Authors:
Antoniko M. Amaral; Stanley J. Olson; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A pressure balanced floating seal system positioned within a structure about a rotating shaft. The floating seal system has a cylindrical outer seal housing having a cylindrical internal recessed region formed in the outer seal housing with a retaining flange extending into said internal recessed region. A cylindrical inner seal housing is positioned within the internal recessed region. The inner seal housing has an annular internal surface for accommodating the ... |
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| Radially Pressure Balanced Floating Seal System |
20 AUG 2000 |
26 pages |
| Authors:
Antoniko M. Amaral; Stanley J. Olson; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A radially pressure balanced floating seal system is used to seal a rotating shaft, such as a drive shaft in a torpedo, or other type of vehicle or machinery. The radially pressure balanced floating seal includes an outer seal housing and an inner seal housing that floats with respect to the outer seal housing. The outer seal housing is secured proximate the shaft bearings, for example, in the tail cone ... |
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| Consideration of Moving Tooth Load in Gear Crack Propagation Predictions |
JUL 2000 |
12 pages |
| Authors:
David G. Lewicki; Lisa E. Spievak; Paul A. Wawrzynek; Anthony R. Ingraffea; Robert F. Handschuh; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| Robust gear designs consider not only crack initiation, but crack propagation trajectories for a fail-safe design. In actual gear operation, the magnitude as well as the position of the force changes as the gear rotates through the mesh. A study to determine the effect of moving gear tooth load on crack propagation predictions was performed. Two dimensional analysis of an involuted spur gear and three-dimensional ... |
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| Mechanical Clamp for Cylindrical Objects |
16 JUN 2000 |
12 pages |
| Authors:
Carl R. Foreman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A clamp for cylindrical objects uses a plurality of split-rings, each of which has a first half-ring and a second half-ring. Each first half-ring is hingedly coupled to a corresponding second half-ring at a hinge point. Means, coupled to each first half-ring at a distance from. the hinge point, are couple to a control assembly. The control assembly is operated to apply one of a pulling force to each first ... |
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| Demonstration of a Microfabricated High-Speed Turbine Supported on Gas Bearings |
08 JUN 2000 |
6 pages |
| Authors:
Luc G. Frechette; Stuart A. Jacobson; Kenneth S. Breuer; Fredric F. Ehrich; Reza Ghodssi; Ravi Khanna; Chee W. Wong; Xin Zhang; Martin A. Schmidt; Alan H. Epstein; MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB
|
| A single-crystal silicon air turbine supported on gas lubricated bearings has been operated in a controlled and sustained manner at rotational speeds greater then I nullion rpm and power levels approaching 5 W. The device is a second-generation version of the microbearing rig first reported by Lin et al. [I], and is the first raicromachine to operate at circumferential tip speeds of hundreds of meters per second, comparable to conventional ... |
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| Lubrication System Failure Baseline Testing on an Aerospace Quality GearMesh |
MAY 2000 |
10 pages |
| Authors:
Robert F. Handschuh; Wilfredo Morales; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| Aerospace drive systems are required to survive a loss-of-lubrication test for qualification. In many cases emergency lubrication systems need to be designed and utilized to permit the drive system to pass this difficult requirement. The weight of emergency systems can adversely affect the mission capabilities of the aircraft. The possibility to reduce the emergency system weight through the use of mist lubrication will be described. Mist ... |
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| Simulating Fatigue Crack Growth in Spiral Bevel Gears |
MAY 2000 |
122 pages |
| Authors:
Lisa E. Spievak; Paul A. Wawrzynek; Anthony R. Ingraffea; CORNELL UNIV ITHACA NY
|
| The majority of helicopter transmission systems utilize spiral bevel gears to convert the horizontal power from the engine into vertical power for the rotor. Due to the cyclical loading on a gear's tooth, fatigue crack propagation can occur. In rotor craft applications, a crack's trajectory determines whether the gear failure will be benign or catastrophic for the aircraft. As a result, the capability to predict ... |
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| Estimation of Extremes from Limited Time Histories: The Routine MaxFits with Wind Turbine Examples |
MAY 2000 |
53 pages |
| Authors:
LeRoy M. Fitzwater; Steven R. Winterstein; STANFORD UNIV CA DEPT OF CIVIL ENGINEERING
|
| This report describes and illustrates the use of the routine MaxFits. This routine estimates statistics of extremes corresponding to arbitrary dynamic load or response processes. It estimates statistics of extremes from limited duration time histories, which may arise either from experimental tests or computationally expensive simulation. A wide range of statistics-e.g., mean, standard deviation, and arbitrary fractiles-can be estimated for an extreme over an arbitrary duration T. The routine also ... |
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| Active-Passive Hybrid Adaptive Structures for Vibration Controls -- An Integrated Approach |
14 APR 2000 |
16 pages |
| Authors:
Kon-Well Wang; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
|
| The objective of this research is to develop, validate and evaluate novel active-passive hybrid adaptive structures for real-time vibration suppressions. These structures could have the advantages of both the passive (stable, low power requirement, tail-safe) and active (high performance, feedback actions) systems. Two types of smart structure configurations have been investigated and advanced: structures with enhanced active constrained layer (EACL) treatment, and structures with active-passive ... |
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| Modelling and Control of a Magneto-Rheological Vibration Damper |
31 MAR 2000 |
109 pages |
| Authors:
R. Stanway; A. R. Johnson; P. H. Mellor; A. Godbehere; N. D. Sims; SHEFFIELD UNIV (UNITED KINGDOM) DEPT OF MECHANICAL ENGINEERING
|
| In this report, the authors describe a study to investigate the feasibility of developing a controllable vibration isolator based upon an MR squeeze-flow damper. The experiments demonstrate conclusively that it is feasible to control the transmissibility of a vibration isolator by manipulating the current supplied to an MR damper. The results also show that significant electromagnetic forces are generated by the damping device in the absence ... |
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| Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinery |
MAR 2000 |
20 pages |
| Authors:
C. Dellacorte; V. Lukaszewicz; M. J. Valco; K. C. Radil; H. Heshmat; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
|
| The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 deg C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS 304, is applied to ... |
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| Development of a Software Evolution Process for Military Systems Composed of Integrated Commercial off the Shelf Components |
MAR 2000 |
168 pages |
| Authors:
Barry J. Hensley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Department of Defense (DoD) acquisition policy requires that military system acquisitions incorporate commercial-off-the-shelf (COTS) components into system architectures. Traditional DoD source code development and evolution methodologies do not effectively support COTS-intensive systems. To fully realize the benefits of COTS technologies and products, the DoD must adopt new ways to sustain system evolution in the face of a dynamic market environment subject to constant change. This ... |
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| Satellite Ultraquiet Isolation Technology Experiment (SUITE) |
MAR 2000 |
17 pages |
| Authors:
Eric H. Anderson; John P. Fumo; R. S. Erwin; CSA ENGINEERING INC MOUNTAIN VIEW CA
|
| An experimental active vibration isolation called Satellite Ultraquiet Isolation Technology Experiment (SUITE) is described in detail. SUITE is a piezoelectricbased technology demonstration scheduled to fly in 2000 or 2001 on board the PICOSat spacecraft. SUITE is designed to show that the effect of small vibrations on spacecraft instrument effectiveness can be reduced significantly. Control from the ground station is planned for the first year after launch. A description of the ... |
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| Design Philosophy and Material Choice for a Tuner in an Electromagnetic Reverberation Chamber |
FEB 2000 |
|
| Authors:
Frank Weeks; Kevin Goldsmith; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION MELBOURNE (AUSTRALIA)
|
 | This note addresses the design philosophy and material choice for the tuner in the Defense Science and Technology Organization (DSTO) electromagnetic combined-mode reverberation chamber. Restricting factors on the material choice are discussed, in addition to tuner and gearbox design requirements. |
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| Stress Analysis of a Tuner for an Electromagnetic Reverberation Chamber |
FEB 2000 |
|
| Authors:
Frank Weeks; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION MELBOURNE (AUSTRALIA)
|
| Structural analyses of a tuner for a large electromagnetic reverberation chamber are presented in this note. The analyses cover drive motor, highly stressed welds of the paddle assembly, torque in drive shafts, andweld fatigue life. The analyses have been conducted for normal operating conditions as well as for a variety of possible overload conditions. Recommendations for minor modifications are made, including the installation of a safety collar. |
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| A Feasibility Study into Increasing the Rotational Speed of the Tuner inthe DSTO Electromagnetic Reverberation Chamber |
FEB 2000 |
|
| Authors:
Frank Weeks; Grant Philp; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION MELBOURNE (AUSTRALIA)
|
| This note presents a feasibility study into reducing the test time inthe Defense Science and Technology Organization (DSTO) Electromagnetic Reverberation chamber by increasing the rotational speed of the tuner. The analyses cover the tuner's structural integrity, the drive motor capacity, and whether the drive motor software can be modified to accommodate the increased speed. |
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| Multivac Installation |
FEB 2000 |
92 pages |
| Authors:
Neal Litman; RUTGERS - THE STATE UNIV NEW BRUNSWICKNJ CENTER FOR ADVANCED FOOD TECHNOLOGY
|
| This report covers the activities of CORANET STP #1014, Multivac Installation. Under the project, two GFE Multivac Horizontal Form-Fill-Seal packaging lines were re-deployed to align the equipment with current readiness requirements. Logistic and technical issues with moving the large machines were fully documented. Installation, Startup and Acceptance of the equipment were reported, including plant requirements and packaging materials data sheets. |
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| Acquisition of a Hydraulic Press for Bulk Simple Shear |
24 JAN 2000 |
13 pages |
| Authors:
Robert E. Barber; K. T. Hartwig; TEXAS A AND M UNIV COLLEGE STATION DEPT OF MECHANICAL ENGINEERING
|
| A 550 kip testing press was acquired by Texas A&M University during the period from April of 1998 through June of 1999. The primary function of the press is to aid in the equal channel angular extrusion (ECAE) process research currently underway in the Department of Mechanical Engineering. Secondary functions include materials testing, education in material deformation, and fabrication forming. The acquisition of the press ... |
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| A Geometric Algorithm for Automated Design of Multi-Stage Molds for Manufacturing Multi-Material Objects |
2000 |
11 pages |
| Authors:
Malay Kumar; Satyandra K. Gupta; MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING
|
| This paper describes a geometric algorithm for automated design of multi-stage molds for manufacturing multi-material objects. In multi-stage molding process, the desired multi-material object is produced by carrying out multiple molding operations in a sequence, adding one material in the target object in each mold-stage. We model multi-material objects as an assembly of single-material components. Each mold-stage can only add one type of material. Therefore, we need a sequence of ... |
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| Device for Machining an Interior Surface of a Tubular Object |
28 DEC 1999 |
|
| Authors:
Donald Arsenault; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Disclosed is a device for use in machining an interior surface of a tubular object which comprises a pair of rails that can be longitudinally installed through the interior section of the tubular object. Braces join the rail for fixing the rails to the tubular object. A platform is movably mounted on the rails to allow longitudinal movement of the platform. A machine tool can be mounted on the platform. ... |
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| Adjustable Electric Motor Bearing System |
14 DEC 1999 |
|
| Authors:
Edward I. Cohen; John G. Purnell; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The parameters of a rotor bearing assembly are readily changed to facilitate evaluation, determination and establishment of optimum hearing clearance and rotor bearing adjustment to minimize noise and vibration, by an arrangement which includes seating of solid deflection pads positioned within a carrier on replaceable adjustment shims and retention of the pads and shims seated in adjusted positions by means of hold-down screws. |
|
| Results of Holdover Time Testing of Type IV Anti-Icing Fluids With the Improved NCAR Artificial Snow Generation System |
DEC 1999 |
44 pages |
| Authors:
Roy M. Rasmussen; Allan Hills; Scott Landolt; Charlie Knight; NATIONAL CENTER FOR ATMOSPHERIC RESEARCH BOULDER CO
|
| This report discusses improvements to the National Center for Atmospheric Research (NCAR) artificial snow generation machine and the results of anti-icing fluid testing with the improved machine. The improvements include: (1) improved control of snowfall rate, (2) development of an integrated frosticator plate/snow mass measuring system, (3) automatic control and recording of the experiment, and (4) direct control of the frosticator plate temperature through an ... |
|
| Ultra Low Volume Dispersal of Insecticides by Ground Equipment |
DEC 1999 |
39 pages |
| Authors:
James R. Brown; Cole J. Church; Joseph M. Conlon; Eric R. Hoffman; ARMED FORCES PEST MANAGEMENT BOARD WASHINGTON DC
|
| Disease vector and nuisance pest control for routine and contingency military operations requires continual modification and updating of techniques and equipment. Coupled with changing pesticide requirements due to resistance and/or environmental considerations, the military utilizes state-of-the-art techniques to ensure protection of its forces. The employment of ultra low volume (ULV) equipment is one example of the methods introduced since 1960 in an effort to improve flying insect control. Primary emphasis ... |
|
| The National Shipbuilding Research Program: Contaminated Sediment Management Guide for NSRP Shipyards. Appendix 4: Removal Technologies |
22 OCT 1999 |
148 pages |
| Authors:
NATIONAL STEEL AND SHIPBUILDING CO SAN DIEGO CA
|
| The United States Environmental Protection Agency (EPA) estimates that about 10 percent of the sediment underlying U.S. lakes, rivers, and bays is sufficiently contaminated with toxic chemicals to pose potential risks. EPA began documenting the extent and severity of sediment contamination through surveys conducted in 1983 and 1987. The surveys found that heavy metals and metalloids, PCBs, pesticides, and polycyclic aromatic hydrocarbons (PAHs) are the most frequently reported contaminants in ... |
|
| The National Shipbuilding Research Program: Contaminated Sediment Management Guide for NSRP Shipyards. Appendix 5: Treatment Technologies |
22 OCT 1999 |
416 pages |
| Authors:
NATIONAL STEEL AND SHIPBUILDING CO SAN DIEGO CA
|
| The United States Environmental Protection Agency (EPA) estimates that about 10 percent of the sediment underlying U.S. lakes, rivers, and bays is sufficiently contaminated with toxic chemicals to pose potential risks. EPA began documenting the extent and severity of sediment contamination through surveys conducted in 1983 and 1987. The surveys found that heavy metals and metalloids, PCBs, pesticides, and polycyclic aromatic hydrocarbons (PAHs) are the most frequently reported contaminants in ... |
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| Belt Repair System and Method. |
12 OCT 1999 |
|
| Authors:
Paul E. Moody; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A belt repair system and method is used to repair a broken belt, such as a drive belt. The belt repair system includes one or more belt couplers having first and second body portions with belt engaging members. The body portions of each belt coupler extend within the broken belt at respective first and second broken ends so that the respective belt engaging members engage with engaging regions within the ... |
|
| Sensorless Electric Drive for Permanent Magnet Synchronous Motors 1999 |
OCT 1999 |
67 pages |
| Authors:
Todd D. Batzel; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| The development and availability of very high energy permanent magnet materials has contributed to an increased use of the permanent magnet synchronous motor (PMSM) in high performance underwater applications. The PMSM offers advantages such as increased efficiency, superior torque to volume and power to volume ratios, and quiet operation. These advantages have resulted in the Navy considering a switch from its present induction motor technology ... |
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| Tapered Resilient Sleeve Bearing Assembly |
14 SEP 1999 |
|
| Authors:
Gus F. Plangetis; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A least two rigid segments of a tapered bearing sleeve are interconnected by deformable elastomeric sections for rotational support of a shaft or pin about a fixed axis established within a housing into which the bearing sleeve is inserted and held therein by an adjustment closure ring under axial pressure of a spring through which radial clearance between the sleeve segments and the shalt varied during transient loading of the ... |
|
| Summary of Research 1998, Department of Mechanical Engineering |
AUG 1999 |
77 pages |
| Authors:
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This report contains summaries of research projects in the Department of Mechanical Engineering. A list of recent publications is also included which consists of conference presentations and publications, books, contributions to books, published journal papers, technical reports, and thesis abstracts. Research at the Naval Postgraduate School is carried out by faculty in the School's eleven academic departments, seven interdisciplinary groups, and the School ofAviation Safety. ... |
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Machinery and Tools
