J. V. Candy
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View article: Localization based on time-reversed event sounds
Localization based on time-reversed event sounds Open
A system determines an event location of an event within an indoor environment based on an event sound generated by the event. The system employs time-reversal techniques based on a received event sound to identify the event location as be…
View article: Resonant Ultrasonic Spectroscopy: A Modal-Analysis Approach for Additive Manufacturing
Resonant Ultrasonic Spectroscopy: A Modal-Analysis Approach for Additive Manufacturing Open
Resonant ultrasonic spectroscopy is a methodology capable of measuring a change in modal resonant frequencies of material structures. It encompasses an inversion technique based on the eigen-frequencies of a simple regular sample geometry …
View article: Subsystem Estimation: A Modal Decomposition Approach
Subsystem Estimation: A Modal Decomposition Approach Open
In structural analysis it is often the requirement that the response of a critical subsystem must be extracted from the response of the overall structure even when not directly excited or sometimes even measured. Based on this requirement,…
View article: Processing of Ultrasonic Measurements for an Additive Manufacturing Application
Processing of Ultrasonic Measurements for an Additive Manufacturing Application Open
Resonant ultrasonic spectroscopy is an effective methodology capable of measuring a change in modal resonant frequencies of material structures. It encompasses techniques based on ultrasonic frequencies employed to estimate elastic coeffic…
View article: Eddy Current Model of a Coil Over An Infinite Perfectly Electrical Conductor (PEC) Half-Plane
Eddy Current Model of a Coil Over An Infinite Perfectly Electrical Conductor (PEC) Half-Plane Open
Eddy current sensors measure the lift-off or distance between the sensor and a conducting surface. They operate on the principle of an alternating current in a conduction coil inducing a magnetic field within the surface. An eddy current i…
View article: Vibrational Energy Harvesting Using a Cantilever Model
Vibrational Energy Harvesting Using a Cantilever Model Open
Vibrational energy harvesting (VEH) is a method of capturing incidental mechanical vibrational energy and converting it to electrical energy. This is enabled by two technologies: Electromagnetic induction via a cantilever or piezoelectric …
View article: Vibration-Based Sensor Design: A Grey-Box Approach
Vibration-Based Sensor Design: A Grey-Box Approach Open
Knowledge of the internal structure of an object or device under investigation proceeds from the basic idea of constructing its dynamic behavioral relations governed by a set of differential/algebraic equations that characterize its respon…
View article: Model Reference Adaptive Control (MRAC) for Additive Manufacturing (AM)
Model Reference Adaptive Control (MRAC) for Additive Manufacturing (AM) Open
Model Reference Adaptive Control (MRAC) is based on the fundamental concept that the process under investigation is to be controlled to follow or “track” a reference system (model) characterized by a state/input/output model employing an a…
View article: JOINT NOISE CANCELLATION/DETECTION FOR A TOWED ARRAY IN A HOSTILE ENVIRONMENT
JOINT NOISE CANCELLATION/DETECTION FOR A TOWED ARRAY IN A HOSTILE ENVIRONMENT Open
Tow ship noise is a major problem plaguing the detection, classification, localization and tracking problems. It is a major contributor to towed array measurement uncertainties that can lead to large estimation errors in any form of signal…
View article: Wideband Multichannel Time-Reversal Processing for Acoustic Communications in a Tunnel-like Structure
Wideband Multichannel Time-Reversal Processing for Acoustic Communications in a Tunnel-like Structure Open
The development of multichannel time-reversal (T/R) processing techniques continues to progress rapidly especially when the need to communicate in a highly reverberative environment becomes critical. The underlying T/R concept is based on …
View article: Detection and Tracking of the Back-Reflection of KDP Images in the Presence or Absence of a Phase Mask
Detection and Tracking of the Back-Reflection of KDP Images in the Presence or Absence of a Phase Mask Open
The KDP crystals present in the final optics assembly at the National Ignition Facility (NIF) are used for conversion of infrared laser light beam into ultraviolet. The conversion is highest for a certain incident angle, the alignment of w…
View article: Processing of Prosthetic Heart Valve Sounds from Anechoic Tank Measurements
Processing of Prosthetic Heart Valve Sounds from Anechoic Tank Measurements Open
People with serious cardiac problems have had their life span extended with the development of the prosthetic heart valve. However, the valves operate continuously at approximately 39 million cycles per year and are therefore subject to st…
View article: Multichannel deconvolution of vibrational signals: A state-space inverse filtering approach
Multichannel deconvolution of vibrational signals: A state-space inverse filtering approach Open
Deconvolution of noisy measurements, especially when they are multichannel, has always been a challenging problem. The processing techniques developed range from simple Fourier methods to more sophisticated model-based parametric methodolo…
View article: Accelerometer Modeling in the State-Space
Accelerometer Modeling in the State-Space Open
Generically, accelerometers are sensors that measure the accelerating force applied to an object. Their operation is based on a simple mechanical system and D’Alembert’s force principle along with Newton’s laws of motion. This device is ty…
View article: Model-Based Ultrasonic Signal Processing for the Nondestructive Evaluation of Additive Manufacturing Components
Model-Based Ultrasonic Signal Processing for the Nondestructive Evaluation of Additive Manufacturing Components Open
Ultrasonic testing (UT) for nondestructive evaluation (NDE) is a critical entity necessary to resolve both the quality and precision questions of complex parts evolving from the innovative additive manufacturing (AM) process. This modality…
View article: Transient recovery problem in acoustics: A multichannel model-based deconvolution approach
Transient recovery problem in acoustics: A multichannel model-based deconvolution approach Open
Critical acoustical systems operating in complex environments contaminated with disturbances and noise offer an extreme challenge when excited by out-of-the-ordinary, impulsive, transient events that can be undetected and seriously affect …
View article: Multichannel Deconvolution of Vibrational Shock Signals: An Inverse Filtering Approach
Multichannel Deconvolution of Vibrational Shock Signals: An Inverse Filtering Approach Open
When transporting critical systems of national security interest, out-of-the ordinary, impulsive events that can potentially be undetected and affect overall system performance are of great concern. Impulsive events that can occur are esse…
View article: Multichannel spectral estimation in acoustics: A state-space approach
Multichannel spectral estimation in acoustics: A state-space approach Open
Spectral estimation is a necessary methodology to analyze the frequency content of noisy data sets especially in acoustic applications. Many spectral techniques have evolved starting with the classical Fourier transform methods based on th…
View article: Vibrational processing of a dynamic structural flight system: A multichannel spectral estimation approach
Vibrational processing of a dynamic structural flight system: A multichannel spectral estimation approach Open
Dynamic testing of large flight vehicles (rockets) is not only complex, but also can be very costly. These flights are infrequent and can lead to disastrous effects if something were to fail during the flight. The development of sensors co…
View article: Multichannel Spectral Estimation: An Approach to Estimating/Analyzing Vibrational Systems
Multichannel Spectral Estimation: An Approach to Estimating/Analyzing Vibrational Systems Open
Dynamic structures either operational or under test require complex spectral analysis in order to characterize their modal responses. In some applications constant vigilance in terms of analysis or potential failures demand an accurate met…
View article: Multipaper Spectral Estimation: An Alternative to the Welch Periodogram Approach
Multipaper Spectral Estimation: An Alternative to the Welch Periodogram Approach Open
Dynamic structural systems either operational or under test require complex spectral analysis in order to characterize their modal responses. In some applications constant vigilance in terms of analysis or potential failures demand an accu…
View article: Signal Processsing for Sounding Rocket Flights: Campaign No. 2 Results
Signal Processsing for Sounding Rocket Flights: Campaign No. 2 Results Open
Sounding rockets provide both a viable and convenient alternative to more costly missile flights with one of the major objectives being to test various types of sensors for monitoring components of high interest as well as developing real-…
View article: Model-Based Localizatiion in a Shallow Ocean Environment: A Sequential Bayesian/Optimization Approach
Model-Based Localizatiion in a Shallow Ocean Environment: A Sequential Bayesian/Optimization Approach Open
The shallow ocean is a dynamically changing medium leading to nonstationary statistical behavior when subjected to temperature, wind, surface variations, bottom interactions, noise and extraneous disturbances as well as other conditions th…
View article: Real-time Signal Processing for Sounding Rocket Modal Frequency Estimation
Real-time Signal Processing for Sounding Rocket Modal Frequency Estimation Open
Signal processing for sounding rocket flights requires not only sophisticated high spectral resolution processing, but also the capability of real-time application. In this report we discuss the possibility of techniques that can be applie…
View article: Multichannel Processing of Vibrational Response Measurements: An Application of Constrained Subspace Identification
Multichannel Processing of Vibrational Response Measurements: An Application of Constrained Subspace Identification Open
Dynamic structural systems occur in a wide variety of applications such as autonomous ve-hicles employed militarily for battlefield management or non-military tasks like tracking awildfire in the hills of a drought-ridden area. Many such s…
View article: Modal Frequency Identification of Vibrational Response Measurements: Simulation/Experiment/Validation
Modal Frequency Identification of Vibrational Response Measurements: Simulation/Experiment/Validation Open
Many critical systems operating in the open seas or in the air employ a variety of subsystems ranging from machinery for propulsion to airfoils for flight or even reactor components as simple as pipes carrying much-need cooling for control…