Now showing items 1-10 of 705
The Effect of Ozone on Diesel Soot Precursors
(Virginia Tech, 1997-04-23)
A joint experimental and numerical project has been initiated at Virginia Tech to study the effect of ozone on diesel soot precursors. This thesis is the first stage of the numerical part of the project, and contains a ...
An Investigation of Performance Limitations in Active Noise Reduction Headsets
(Virginia Tech, 1998-04-27)
Closed-loop performance of an active noise reduction (ANR) headset is limited by phase lag. Speaker dynamics, control hardware, and acoustic wave propagation from the control speaker to the error microphone all contribute ...
Assembly Sequence Optimization and Assembly Path Planning
(Virginia Tech, 1999-08-31)
This thesis addresses two important aspects of automatic assembly viz., assembly sequence planning and assembly path planning. These issues are addressed separately starting with sequence planning followed by assembly path ...
Evaluation of a Heat Flux Microsensor in a Transonic Turbine Cascade
(Virginia Tech, 1997-10-30)
The effects of using an insert Heat Flux Microsensor (HFM) versus an HFM deposited directly on a turbine blade to measure heat flux in a transonic cascade are investigated. The HFM is a thin-film sensor, 6.35 mm (0.250") ...
A Formulation for Updating Finite Element Models Through Consistent Use of Laser Vibrometer Data
(Virginia Tech, 1998-04-28)
This thesis suggests a formulation for updating physically meaningful parameters in analytical finite element(FE) models using scanning laser Doppler vibrometer(SLDV) dynamic response data. The update formulation is ...
Computer Aided Analysis of Smoke Stack Designs
(Virginia Tech, 1996-09-01)
The purpose of this research is to analyze the statics and dynamics of steel smoke stacks subject to excitation by aerodynamic forces. The wind loads experienced by smoke stacks arise from various phenomenon, the most ...
Application of the Filtered-X LMS Algorithm for Disturbance Rejection in Time-Periodic Systems
(Virginia Tech, 1996-05-03)
Extensive disturbance rejection methods have been established for time-invariant systems. However, the development of these techniques has not focused on application to time-periodic systems in particular until recently. ...
Design of User-Weight-based Exercise Machines
(Virginia Tech, 1997-02-07)
This thesis describes the process of designing exercise machines that raise the weight of the user as the primary source of resistance. Most strength training machines use weight stacks or springs as the source of ...
Evaluation of aged woodstove catalysts
(Virginia Tech, 1995-04-27)
Woodstove emission of atmospheric pollutants has been a growing concern in the last two decades, and catalytic combustors have been used in woodstoves to reduce emissions. Field tests of EPA-certified catalytic stoves have ...
Moisture transfer in porous materials exposed to combined humidity and temperature gradients
(Virginia Tech, 1996-03-03)