10 citations · 15 across the 7 of their papers we have counts for
7 papers
Adjoint-Based Identification of Sound Sources for Sound Reinforcement and Source Localization
Mathias Lemke, Lewin Stein
The identification of sound sources is a common problem in acoustics. Different parameters are sought, among these are signal and position of the sources. We present an adjoint-bas…
Approximate Acoustic Boundary Conditions in the Time-Domain using Volume Penalization
Mathias Lemke, Julius Reiss
Immersed boundary methods allow describing complex objects on simple Cartesian grids in time-domain simulations. The penalization technique employed here is a physically motivated…
Supervised Learning for Multi Zone Sound Field Reproduction under Harsh Environmental Conditions
Henry Sallandt, Philipp Krah, Mathias Lemke
This manuscript presents an approach for multi zone sound field reproduction using supervised learning. Traditional multi zone sound field reproduction methods assume constant spee…
A "DIY" data acquisition system for acoustic field measurements under harsh conditions
Steffen Büchholz, Mathias Lemke, Julius Reiss +1
Monitoring active volcanos is an ongoing and important task helping to understand and predict volcanic eruptions. In recent years, analysing the acoustic properties of eruptions be…
Finite-difference-based simulation and adjoint optimization of gas networks
Sonja Hossbach, Mathias Lemke, Julius Reiss
The stable operation of gas networks is an important optimization target. While for this task commonly finite volume methods are used, we introduce a new finite difference approach…
Mode-based derivation of adjoint equations - a lazy man's approach
Julius Reiss, Mathias Lemke, Jörn Sesterhenn
A method to calculate the adjoint solution for a large class of partial differential equations is discussed. It differs from the known continuous and discrete adjoint, including au…
A parallel and matrix free framework for global stability analysis of compressible flows
O. Henze, M. Lemke, J. Sesterhenn
An numerical iterative framework for global modal stability analysis of compressible flows using a parallel environment is presented. The framework uses a matrix-free implementatio…