A5024668825- Nuclear reactor physics and engineering
- Non-Destructive Testing Techniques
- Fusion materials and technologies
- Ultrasonics and Acoustic Wave Propagation
- Magnetic confinement fusion research
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Nuclear and radioactivity studies
- Geophysical Methods and Applications
- Graphite, nuclear technology, radiation studies
- Robotic Mechanisms and Dynamics
- Plasma Diagnostics and Applications
- Robot Manipulation and Learning
- Hydraulic and Pneumatic Systems
- Structural Integrity and Reliability Analysis
- Particle accelerators and beam dynamics
- Real-time simulation and control systems
- Superconducting Materials and Applications
- Soft Robotics and Applications
- Advanced Vision and Imaging
- Rocket and propulsion systems research
- Electromagnetic Launch and Propulsion Technology
- Flow Measurement and Analysis
- Sensor Technology and Measurement Systems
- Optimization and Search Problems
Oak Ridge National Laboratory
2011-2022
National Technical Information Service
2011-2022
Office of Scientific and Technical Information
2011-2012
Bethel University
2006
Intelligent Automation (United States)
2005
Knoxville College
2001-2003
University of Maryland, College Park
1994-2002
The availability of future fusion devices, such as a nuclear science facility or demonstration power station, greatly depends on long operating lifetimes plasma facing components in their divertors. ORNL is designing the Material Plasma Exposure eXperiment (MPEX), superconducting magnet, steady-state device to address material interactions reactors. MPEX will utilize new highintensity source concept based RF technology. This allow experiment cover entire expected conditions divertor reactor....
Linear plasma generators are cost effective facilities to simulate divertor conditions of present and future fusion reactors. They used address important R&D gaps in the science material interactions towards viable facing components for Next generation have be able access expected on targets ITER devices. The steady-state linear device MPEX will this regime with electron temperatures 1–10 eV densities . resulting heat fluxes about 10 MW is designed deliver those a novel Radio Frequency...
The calibration requirements for visual servoing can make it difficult to apply in many real-world situation One approach image-based without is dynamically estimate the image Jacobian and use as basis control. However, with normal motion of a robot towards goal, estimation deteriorates over time. We propose additional "exploratory motion" considerably improve Jacobian. study role such exploratory task. Simulations experiments 6-DOF are used verify practical feasibility approach.
Circumferential guided ultrasonic Shear Horizontal (SH) wave Electromagnetic Acoustic Transducer (EMAT) pairs mounted on a mobile fixture in through-transmission mode were used for detection and characterization of mechanical dents the outer surface pipe wall from inside pipe. The created 12 in. diameter standard seamless steel by hydraulically pressing balls various sizes into wall. n1 SH was directed through along Multiple measurements obtained both no-flaw region using EMAT pair. Dent...
The availability of future fusion devices such as a Fusion Nuclear Science Facility (FNSF) or DEMO greatly depends on long operating lifetimes plasma facing components in their divertors. ORNL is designing the Material-Plasma Exposure eXperiment (MPEX), superconducting magnet, steady-state device to address material interactions reactors. MPEX will utilize new high-intensity source concept based RF technology. This allow experiment cover entire expected conditions divertor reactor. It be...
A simple and cost-effective method for detecting propagation of acoustic waves based on the harmonic oscillations a piezoresistive microcantilever is presented. Monitoring Fourier amplitude microcantilever’s fundamental frequency, dependence detected upon source location, measured. At fixed probe–source distance, solid angular cantilever plane relative to studied. The potential use microelectromechanical as an leak sensor pressurized gas reservoirs addressed.
As U.S. natural gas supply pipelines are aging, non-destructive inspection techniques needed to maintain the integrity and reliability of infrastructure. Ultrasonic waves one promising method for pipeline integrity. travel through pipe wall, they affected by features encounter. In order build a practical system that uses ultrasonic waves, an analysis is can distinguish between normal wall features, such as welds, potentially serious flaws, cracks corrosion. Ideally, determination "flaw"...
Understanding the science of plasma-material interactions (PMI) is essential for future development fusion facilities. The design divertors and first walls next generation long-pulse facilities, such as a Fusion Nuclear Science Facility (FNSF) or DEMO, requires significant PMI research development. In order to meet this need, new linear plasma facility, Materials Plasma Exposure Experiment (MPEX) proposed, which will produce divertor relevant conditions these device be capable handling low...
In this paper, the development of a novel piezoelectric-based locomotion design for meso-scale mobile robot is described. The exploits compliant mechanical structure that enables piezoelectric forces to be amplified and transmitted "legs" propel through lift pull scheme. contrasts with typical slip/stick approaches assume inertia effects will allow slip on smooth surface. By eliminating slipping assumption, potential surfaces proposed can traverse significantly extended. Discussions are...
Summary When an object is held by a multi-fingered hand, the values of contact forces can be multivalued. An objective function, when used in conjunction with frictional and geometric constraints grasp, however, give unique set finger force values. The selection function determining dependent on type grasp required, material properties object, limitations röbot fingers. In this paper several optimization functions are studied their merits highlighted. introduces graphical representation that...
This paper is concerned with the detection of physical flaws on pipe walls in gas pipelines. The sensor technology EMAT, a non-contact ultrasonic technology. One EMAT used as transmitter, exciting an impulse into wall. Another located few inches away from first receiving transducer. reports identification flaw signatures receiver output. step characterization to perform wavelet analysis signature. Being non-shift-invariant, array coefficients discrete transfor signal not directly suitable...
Circumferentially guided ultrasonic Shear Horizontal wave Electromagnetic Acoustic Transducer pairs in a through‐transmission mode were used for detection and characterization of mechanical dents on the outer surface pipe from inside. A mobile fixture with resolver is designed EMAT probes so that sensor positions waveforms are recorded as platform goes through pipe. Safety critical “cup” relatively benign “saucer” 25% wall thickness deeper successfully detected classified n1 SH support...
The Material Plasma Exposure eXperiment (MPEX) steady-state linear plasma facility is currently under design at Oak Ridge National Laboratory. proposes to produce ITER divertor-relevant conditions with heat fluxes up 10 MW/m2 ion 1024/m2‧s. Plasmas will be produced from a helicon source additional electron cyclotron and heating, contained by superconducting magnets. MPEX capable of including targets that have been neutron irradiated the High Flux Isotope Reactor (HFIR) in order examine...
Abstract Eddy current flow meters (ECFMs) measure flows of conductive fluids. Recent interest in ECFMs has increased due to applications advanced nuclear reactors. are well suited for such applications, as they can provide non-invasive measurements fluids that often difficult measure. Traditionally, operated using an alternating at a single frequency, limiting average fluid velocities, blockages, or voids. We expand the capabilities by measuring radial velocity profile liquid mercury. To...