Andreas Wimmer
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View article: A robust sampling technique for realistic distribution simulation in federated learning
A robust sampling technique for realistic distribution simulation in federated learning Open
Purpose Federated Learning helps training deep learning networks with diverse data from different locations, particularly in restricted clinical settings. However, label distributions overlapping only partially across clients, due to diffe…
View article: High Speed Particle Image Velocimetry in a Large Engine Prechamber
High Speed Particle Image Velocimetry in a Large Engine Prechamber Open
Planar velocity measurements using the particle image velocimetry technique have been performed at a repetition rate of 10 kHz in the prechamber of a large bore gas engine mounted on a rapid compression machine (RCM), to visualize the velo…
View article: Finding the Optimum Design of Large Gas Engines Prechambers Using CFD and Bayesian Optimization
Finding the Optimum Design of Large Gas Engines Prechambers Using CFD and Bayesian Optimization Open
The turbulent jet ignition concept using prechambers is a promising solution to achieve stable combustion at lean conditions in large gas engines, leading to high efficiency at low emission levels. Due to the wide range of design and opera…
View article: Experimental and simulative investigation of welding sequences on thermally induced distortions in wire arc additive manufacturing
Experimental and simulative investigation of welding sequences on thermally induced distortions in wire arc additive manufacturing Open
Purpose The purpose of this paper is to demonstrate the impact of the welding sequence on the substrate plate distortion during the wire and arc additive manufacturing (WAAM) process. This paper also aims to show the capability of finite e…
View article: Towards Additively Manufactured Metamaterials with Powder Inclusions for Controllable Dissipation: The Critical Influence of Packing Density
Towards Additively Manufactured Metamaterials with Powder Inclusions for Controllable Dissipation: The Critical Influence of Packing Density Open
Particle dampers represent a simple yet effective means to reduce unwanted oscillations when attached to structural components. Powder bed fusion additive manufacturing of metals allows to integrate particle inclusions of arbitrary shape, …
View article: Adaptive Methods for Fault Detection on Research Engine Test Beds
Adaptive Methods for Fault Detection on Research Engine Test Beds Open
In the case of test beds for research engines, fault detection methods that use models based on historical data face a particular challenge.Due to the experimental design of the test bed, offline training of statistical models with a data …
View article: Underlying Methodology for a Thermal Process Monitoring System for Wire and Arc Additive Manufacturing
Underlying Methodology for a Thermal Process Monitoring System for Wire and Arc Additive Manufacturing Open
The Wire and Arc Additive Manufacturing (WAAM) process has a high potential for industrial applications in aviation. The interlayer temperatures influence the dimensions and geometric deviations of the part. Monitoring the absolute interla…
View article: Smart charging infrastructure for battery electric vehicles in multi apartment buildings
Smart charging infrastructure for battery electric vehicles in multi apartment buildings Open
One of the major challenges for the widespread acceptance of battery electric vehicles (BEVs) is the availability of charging infrastructure at home and the link to the distribution grid. The charging process design needs to minimise the i…
View article: Methodology to Determine Melt Pool Anomalies in Powder Bed Fusion of Metals Using a Laser Beam by Means of Process Monitoring and Sensor Data Fusion
Methodology to Determine Melt Pool Anomalies in Powder Bed Fusion of Metals Using a Laser Beam by Means of Process Monitoring and Sensor Data Fusion Open
Additive manufacturing, in particular the powder bed fusion of metals using a laser beam, has a wide range of possible technical applications. Especially for safety-critical applications, a quality assurance of the components is indispensa…
View article: Experimental and Numerical Investigations of In Situ Alloying during Powder Bed Fusion of Metals Using a Laser Beam
Experimental and Numerical Investigations of In Situ Alloying during Powder Bed Fusion of Metals Using a Laser Beam Open
Powder Bed Fusion of Metals using a Laser Beam (PBF-LB/M) is increasingly utilized for the fabrication of complex parts in various industrial sectors. Enabling a robust and reproducible manufacturing process is one of the main goals in vie…
View article: Rotating Scan Strategy Induced Anisotropic Microstructural and Mechanical Behavior of Selective Laser Melted Materials and Their Reduction by Heat Treatments
Rotating Scan Strategy Induced Anisotropic Microstructural and Mechanical Behavior of Selective Laser Melted Materials and Their Reduction by Heat Treatments Open
Choosing a properly optimized rotating scan strategy during the selective laser melting (SLM) process is essential to reduce residual stresses and thus to obtain homogeneous properties. Surprisingly, anisotropic material properties are fou…
View article: Investigations on the influence of adapted metal-based alloys on the process of laser beam melting
Investigations on the influence of adapted metal-based alloys on the process of laser beam melting Open
Additive manufacturing technologies are characterized by complex process interrelations. Consequently, specifically adapted alloys are required to enable a robust building process. In particular, laser beam melting (LBM) is increasingly us…
View article: Analysis of the phase transformation of AlSi10Mg during Laser Powder Bed Fusion
Analysis of the phase transformation of AlSi10Mg during Laser Powder Bed Fusion Open
The characteristics of the process zone during Laser Powder Bed Fusion (LPBF) are decisive for the quality of additively manufactured parts. Thermographic measurements give an insight into the temperatures of the melt pool and its surround…
View article: The HyMethShip Project: Innovative Emission Free Propulsion for Maritime Applications
The HyMethShip Project: Innovative Emission Free Propulsion for Maritime Applications Open
Authors manuscript for Proceedings of the 17th FAD-Conference, 6 - 7 Nov 2019, Dresden, pp 150-170
View article: The HyMethShip Project: Innovative Emission Free Propulsion for Ships
The HyMethShip Project: Innovative Emission Free Propulsion for Ships Open
Paper for the 29th CIMAC World Congress on Internal Combustion Engines, 10 - 14 June 2019, Vancouver (Canada)
View article: LDM Compact – A Highly Efficient Method for Developing Gas Engines for Use with Low Environmental Impact Non-Natural Gas
LDM Compact – A Highly Efficient Method for Developing Gas Engines for Use with Low Environmental Impact Non-Natural Gas Open
The use of gas engines fuelled by non-natural gases (NNG) for power generation and heat is key to exploiting resources in a more environmentally friendly manner and achieving a general reduction in CO 2 emissions, Fig. 1.NNG encompasses la…
View article: Computational fluid dynamics-fe simulation for the optimization of a cylinder pressure sensor application in a large gas engine
Computational fluid dynamics-fe simulation for the optimization of a cylinder pressure sensor application in a large gas engine Open
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .