James E. Case
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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 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: 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: 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…
View article: Modal Frequency Identification of a Cylindrical Object from Noisy Vibrational Response Measurements
Modal Frequency Identification of a Cylindrical Object from Noisy Vibrational Response Measurements Open
The investigation of the vibrational response of a cylindrical object in a noisy environment (a pipe in air) to impact excitations provided by a cam-driven, hammer-like surface, randomly excited by an electric motor is of high interest—esp…