The introduction of mistuning in jet-engine bladed disks can lead to large changes in stability and forced response. Even small random mistuning (within the bounds of manufacturing tolerance) can lead to unacceptable response and high-cycle fatigue. Meanwhile, intentional mistuning may improve stability and forced response under manufacturing uncertainty. This paper presents a general framework...

Since a large number of physical parameters influence the flame dynamics in a full scale gas turbine combustor, it is virtually impossible to develop physically correlated reduced order models for flame dynamics by directly studying these complex reacting flows. Even the Rijke tube combustor system, though comprising of a simple geometry and a flat flame, shows a strong nonlinear coupling betwe...

Abstract We show how spectral submanifold theory can be used to construct reduced-order models for harmonically excited mechanical systems with internal resonances. Efficient calculations of periodic and quasi-periodic responses the are discussed in this paper its companion, Part II, respectively. The dimension a model is determined by number modes involved resonance, independently full system....

R ECENTLY there has been a renewed interest in the physiologic effects of forced straining (Valsalva's maneuver). Particular emphasis has been placed on the blood pressure changes during and immediately after forced straining in an attempt to define more accurately the diagnosis of certain circulatory abnormalities, particularly hemodynamically significant mitral stenosis and the presence of co...

This report reviews the mathematical analysis of mistuned aeroelasticity in turbomachines, avoiding excessive mathematical complexity, and putting the emphasis on the physical interpretation of the mathematics. The aeroe-lastic behaviour can be analysed either by considering the motion of individual blades or by considering a sum of travelling wave modes. The modal viewpoint is shown to be most...

A new generalized forced quantitative randomized response (GFQRR) model for estimating the population total of a sensitive variable is proposed and studied under a unified setup. The bias and variance expressions are derived under unequal probability sampling design. It is shown that the models due to Eichhorn and Hayre (1983), Bar-Lev, Bobovitch, and Boukai (2004), Liu and Chow (1976a, 1976b),...

.......................................................................................................... 3 Introduction ..................................................................................................... 4 Single-stimulus response format ................................................................... 4 Response biases affecting single-stimulus items ........................

Model projections of heavy precipitation and temperature extremes include large uncertainties. We demonstrate that the disagreement between individual simulations primarily arises from internal variability, whereas models agree remarkably well on the forced signal, the change in the absence of internal variability. Agreement is high on the spatial pattern of the forced heavy precipitation respo...