Ralf Zimmermann

发表

A New Cokriging Method for Variable-Fidelity Surrogate Modeling of Aerodynamic Data

Zhong-Hua Han, Ralf Zimmermann, Stefan Goertz, 2010 .

A POD-based reduced order modeling approach for the efficient computation of high-lift aerodynamics

Stefan Görtz, Ralf Zimmermann, Michael Mifsud, 2011 .

On Improving Efficiency and Accuracy of Variable-Fidelity Surrogate Modeling in Aero-data for Loads Context

Stefan Görtz, Zhong-Hua Han, Ralf Zimmermann, 2009 .

Agenda "Clean Air in Ports" TRANSPORT WEEK March 19 th 2015, GDANSK

Ralf Zimmermann, Julia Balz, Michalina Bielawska, 2015 .

Authorship Verification via k-Nearest Neighbor Estimation

Martin Steinebach, Ralf Zimmermann, Oren Halvani, 2013 .

Parametric Model Reduction via Interpolating Orthonormal Bases

Ralf Zimmermann, Kristian Debrabant, R. Zimmermann, 2019, Lecture Notes in Computational Science and Engineering.

Simplified Cross-Correlation Estimation For Multi-Fidelity Surrogate Cokriging Models

Ralf Zimmermann, Zhong-Hua Han, R. Zimmermann, 2010 .

Speeding up Kriging by Using Pivoted Cholesky Decomposition and Low-Rank Structures

Dishi Liu, Hermann G. Matthies, Ralf Zimmermann, 2016 .

Speeding-up the computation of high-lift aerodynamics using a residual-based reduced-order model

Stefan Görtz, Ralf Zimmermann, Michael Mifsud, 2015 .

Reduced order modeling of steady flows subject to aerodynamic constraints

Stefan Görtz, Ralf Zimmermann, Alexander Vendl, 2014 .

Improving variable-fidelity surrogate modeling via gradient-enhanced kriging and a generalized hybrid bridge function

Stefan Görtz, Zhong-Hua Han, Ralf Zimmermann, 2013 .

Improved extrapolation of steady turbulent aerodynamics using a non-linear POD-based reduced order model

Stefan Görtz, Ralf Zimmermann, R. Zimmermann, 2012, The Aeronautical Journal (1968).

Dictionary of lighting engineering in four languages : English, German, French, Russian

Ralf Zimmermann, 1990 .

The real symplectic Stiefel and Grassmann manifolds: metrics, geodesics and applications pdf

Ralf Zimmermann, Thomas Bendokat, R. Zimmermann, 2021, ArXiv.

Computing the Riemannian logarithm on the Stiefel manifold: metrics, methods and performance pdf

Knut Hüper, Ralf Zimmermann, 2021, ArXiv.

Efficient Quasi-Geodesics on the Stiefel Manifold

Ralf Zimmermann, Thomas Bendokat, 2021, GSI.

Model order reduction for steady aerodynamics of high-lift configurations

Stefan Görtz, Ralf Zimmermann, Heike Faßbender, 2014 .

Towards best-practice guidelines for POD-based reduced order modeling of transonic flows

Ralf Zimmermann, 2011 .

Non-Linear POD-based Reduced Order Models for Steady Turbulent Aerodynamics

Stefan Görtz, Ralf Zimmermann, 2010 .

On the condition number anomaly of Gaussian correlation matrices

Ralf Zimmermann, R. Zimmermann, Ralf Zimmermann, 2015 .

A Comprehensive Comparison of Various Algorithms for Efficiently Updating Singular Value Decomposition Based Reduced Order Models

Ralf Zimmermann, R. Zimmermann, 2011 .