Search Results - "Heckl, A."

Reasons for the enhanced phase stability of Ru-containing nickel-based superalloys by Heckl, A., Neumeier, S., Cenanovic, S., Göken, M., Singer, R.F.

“…Improvements in phase stability on the addition of Ru are well known in the field of nickel-based superalloy development. However, the key mechanism of this…”
Get full text

A 3-D view on the mechanisms of short fatigue cracks interacting with grain boundaries by Schaef, W., Marx, M., Vehoff, H., Heckl, A., Randelzhofer, P.

“…Short fatigue cracks propagate with a fluctuating crack growth rate while interacting with microstructural barriers. Although some models of the interaction…”
Get full text

The Importance of Diffusivity and Partitioning Behavior of Solid Solution Strengthening Elements for the High Temperature Creep Strength of Ni-Base Superalloys by Giese, S., Bezold, A., Pröbstle, M., Heckl, A., Neumeier, S., Göken, M.

“…The creep resistance of single-crystalline Ni-base superalloys at elevated temperatures depends among others on solid solution strengthening of the γ -matrix…”
Get full text

High-resolution climate change simulations for the Jordan River area by Smiatek, G., Kunstmann, H., Heckl, A.

“…For the estimation of future climate conditions in the Jordan River region, the National Center for Atmospheric Research–Penn State University meteorology…”
Get full text

Solidification Characteristics and Segregation Behavior of Nickel-Base Superalloys in Dependence on Different Rhenium and Ruthenium Contents by Heckl, A., Rettig, R., Singer, R.F.

“…The influence of Re and Ru on phase diagram, as-cast microstructure, and segregation behavior has been investigated using a series of 12 experimental…”
Get full text

Investigation of the final stages of solidification and eutectic phase formation in Re and Ru containing nickel-base superalloys by Heckl, A., Rettig, R., Cenanovic, S., Göken, M., Singer, R.F.

“…The microstructure resulting from the final stages of solidification—commonly referred to as eutectic islands—has been analysed in detail for three nickel-base…”
Get full text

COUPLED WAVES ON A PERIODICALLY SUPPORTED TIMOSHENKO BEAM by HECKL, MARIA A.

“…A mathematical model is presented for the propagation of structural waves on an infinitely long, periodically supported Timoshenko beam. The wave types that…”
Get full text

Aeroacoustic response of an array of tubes with and without bias-flow by Surendran, Aswathy, Heckl, Maria A., Peerlings, Luck, Boij, Susann, Bodén, Hans, Hirschberg, Avraham

“…Heat exchangers, consisting of tube arrays in a cross-flow are a vital component of power generation systems. They are of interest from an acoustic point of…”
Get full text

Physically based distributed hydrological modelling of the Upper Jordan catchment and investigation of effective model equations by Kunstmann, H, Heckl, A, Rimmer, A

“…Sufficient freshwater availability in the water scarce environment of the Upper Jordan Catchment (UJC) is a central prerequisite for peaceful agricultural and…”
Get full text

Curve squeal of train wheels: unstable modes and limit cycles by Heckl, Maria A.

“…When a train goes round a curve, a transverse friction force may act at the contact points between the wheels and the rail in such a way that the wheels are…”
Get full text

Passive instability control by a heat exchanger in a combustor with nonuniform temperature by Surendran, Aswathy, Heckl, Maria A

“…Thermoacoustic instabilities, caused by the feedback between unsteady heat release and acoustic pressure perturbations, are characterised by large-amplitude…”
Get full text

CURVE SQUEAL OF TRAIN WHEELS, PART 1: MATHEMATICAL MODEL FOR ITS GENERATION by HECKL, MARIA A., ABRAHAMS, I.D.

“…A mathematical model is presented for the squeal noise generated by trains when traversing tight curves. Curve squeal is presumed to arise from lateral…”
Get full text

CURVE SQUEAL OF TRAIN WHEELS, PART 2: WHICH WHEEL MODES ARE PRONE TO SQUEAL? by HECKL, MARIA A.

“…This paper presents a frequency-domain analysis of a friction-driven wheel that is responsible for wheel squeal. A linear friction characteristic is assumed…”
Get full text

Stability analysis of the Rijke tube with a Green's function approach by Heckl, Maria A., Howe, M.S.

“…An analysis is made of the stability of a Rijke tube. The tube is open at both ends and contains an acoustically compact flame holder that “blocks” the…”
Get full text

Analytical model of nonlinear thermo-acoustic effects in a matrix burner by Heckl, Maria A.

“…This paper considers a fundamental thermo-acoustic test rig developed by Noiray (Linear and Nonlinear Analysis of Combustion Instabilities, Application to…”
Get full text

The effect of Re and Ru on γ/γ′ microstructure, γ-solid solution strengthening and creep strength in nickel-base superalloys by Heckl, A., Neumeier, S., Göken, M., Singer, R.F.

“…Larson–Miller-plot for DS-Astra1-alloys with different Re contents at constant (a) 0at.% Ru, (b) 1at.% Ru and (c) 2at.% Ru. [Display omitted] ► Creep rupture…”
Get full text

Passive control of instabilities in combustion systems with heat exchanger by Surendran, Aswathy, Heckl, Maria A, Hosseini, Naseh, Teerling, Omke Jan

“…One of the major concerns in the operability of power generation systems is their susceptibility to combustion instabilities. In this work, we explore whether…”
Get full text

CURVE SQUEAL OF TRAIN WHEELS, PART 3: ACTIVE CONTROL by HECKL, MARIA A., HUANG, X.Y.

“…This paper presents a new method to annul the squeal noise that is produced by trains traversing a curve. The method is a special form of active control,…”
Get full text

ACTIVE CONTROL OF FRICTION-DRIVEN OSCILLATIONS by Heckl, Maria A., Abrahams, I.D.

“…This paper introduces an active control technique that combats oscillations driven by dry friction forces. Dry friction can act as the excitation mechanism for…”
Get full text

Some recent developments in the theory of acoustic transmission in tube bundles by Heckl, Maria A., Mulholland, L.S.

“…A comprehensive theoretical model for acoustic transmission in a tube bundle is presented. The tube bundle is considered as a series of diffraction gratings…”
Get full text