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RISDirCol5i: Trajectory Optimization for Problems With High-Order Derivatives
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this technical brief, we focus on solving trajectory optimization problems that have nonlinear system dynamics and that include high-order derivatives in the objective function. This type of problem comes up in robotics—for ...
The Impact of Nonsynoptic Sampling on Mesoscale Oceanographic Surveys with Towed Instruments
Publisher: American Meteorological Society
Abstract: Mesoscale ocean features, such as eddies and frontal meanders, have temporal and spatial scales that are poorly resolved by conventional surveying methods such as moorings and CTD casts. Towed instruments provide a method ...
Using Supplementary Cementitious Materials to Mitigate Alkali-Silica Reaction in Concrete with Recycled-Concrete Aggregate
Publisher: ASCE
Abstract: Recycled concrete aggregate (RCA) is a key tool for improving sustainability in the construction and demolition industries. The use of RCA in new concrete is, in part, obstructed by the dearth of research available on the ...
Inferring Flame Transfer Functions of Turbulent Conical Flames From Pressure Measurements
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We use approximate Bayesian inference, accelerated by adjoint methods, to construct a quantitatively accurate model of the thermoacoustic behavior of a weakly turbulent conical flame in a duct. We first perform a series ...
A Comprehensive Habit Diagram for Atmospheric Ice Crystals: Confirmation from the Laboratory, AIRS II, and Other Field Studies
Publisher: American Meteorological Society
Abstract: Recent laboratory experiments and in situ observations have produced results in broad agreement with respect to ice crystal habits in the atmosphere. These studies reveal that the ice crystal habit at ?20°C is platelike, ...
A Theoretical Approach for Passive Control of Thermoacoustic Oscillations: Application to Ducted Flames
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, we develop a linear technique that predicts how the stability of a thermoacoustic system changes due to the action of a generic passive feedback device or a generic change in the base state. From this, one ...
Shape Optimization of an Industrial Aeroengine Combustor to Reduce Thermoacoustic Instability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We parameterize the geometry of an industrial aeroengine combustor using free-form deformation (FFD). We then define the thermoacoustic system parameters and impose the acoustic boundary conditions to calculate the ...
Materials Processing Defects
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The papers in this special edition came from lectures delivered at the Fifth International Conference on Materials Processing Defects (MPD-5) held at Cornell University July 18–20, 2007 at Cornell ...
Effects of a Cracked Blade on Mistuned Turbine Engine Rotor Vibration
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An efficient methodology for predicting the nonlinear forced vibration response of a turbine engine rotor with a cracked blade is presented and used to investigate the effects of the damage ...
Nonlinear Phenomena in Thermoacoustic Systems With Premixed Flames
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Nonlinear analysis of thermoacoustic instability is essential for the prediction of the frequencies, amplitudes, and stability of limit cycles. Limit cycles in thermoacoustic systems are reached when the energy input from ...