Tuomas Antero Airaksinen

Tuomas Antero Airaksinen
University of Jyväskylä | JYU · Department of Mathematical Information Technology

PhD

About

13
Publications
2,708
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109
Citations
Introduction
Current projects: - Point cloud segmentation and cleanup with neural networks Past projects: - Shape optimization of far-field solution in environmental acoustics problems (noise barriers etc). - FEM based optimal active noise control method - Efficient preconditioner/iterative solver for Helmholtz and Navier equations - Shape optimization of mufflers
Skills and Expertise
Education
June 2006 - October 2011
University of Jyväskylä
Field of study
  • Computer Science
January 2002 - May 2006
University of Jyväskylä
Field of study
  • Physics

Publications

Publications (13)
Article
A new method is presented to obtain a local active noise control that is optimal in stochastic environment. The method uses numerical acoustical modeling that is performed in the frequency domain by using a sequence of finite element discretizations of the Helmholtz equation. The stochasticity of domain geometry and primary noise source is consider...
Article
A local active noise control method that uses stochastic numerical acoustical modeling is introduced. The frequency domain acoustical simulations are performed by a sequence solutions to Helmholtz equations approximated by FEM. The proposed ANC method maps microphone measurements linearly to the output signals of antinoise actuators. The matrix def...
Article
Full-text available
A numerical method for optimizing the local control of sound in a stochastic domain is developed. A three-dimensional enclosed acoustic space, for example, a cabin with acoustic actuators in given locations is modeled using the nite element method in the frequency domain. The optimal local noise control signals minimizing the least square of the pr...
Article
Full-text available
This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform waveguides with non-uniform obstructions. It is based on coupling a wave based modal solution in the...
Article
Full-text available
Airaksinen, Tuomas Numerical methods for acoustics and noise control Jyväskylä: University of Jyväskylä, 2010, 58 p.(+included articles) (Jyväskylä Studies in Computing ISSN 1456-5390; 120) ISBN 978-951-39-4031-7 Finnish summary Diss. This dissertation considers numerical methods for wave propagation modelling and noise control. The first part of t...
Article
Full-text available
Computational acoustical models allow automated optimization of tractor design with respect to acoustic properties, which could speed up significantly the design process of tractor cabin prototypes. This article gives insightful prospec-tives to the tractor design process by considering modern computational acoustics technology. Mathematical formul...
Article
A method to find optimal locations and properties of anti-noise actuators in a local noise control system is considered. The local noise control performance is approximated by an approach based on a finite element method, attempting to estimate the average performance of an optimal active noise control (ANC) system. Local noise control uses a fixed...
Article
Processes that can be modeled with numerical calculations of acoustic pressure fields include medical and industrial ultrasound, echo sounding, and environmen-tal noise. We present two methods for making these calculations based on Helmoltz equation. The first method is based directly on the complex-valued Helmholtz equa-tion and an algebraic multi...
Article
A physical damping is considered as a preconditioning technique for acoustic and elastic wave scattering. The earlier preconditioners for the Helmholtz equation are generalized for elastic materials and three-dimensional domains. An algebraic multigrid method is used in approximating the inverse of damped operators. Several numerical experiments de...
Article
A preconditioner defined by an algebraic multigrid cycle for a damped Helmholtz operator is proposed for the Helmholtz equation. This approach is well-suited for acoustic scattering problems in complicated computational domains and with varying material properties. The spectral properties of the preconditioned systems and the convergence of the GMR...
Thesis
Full-text available
Tutkielmassa tarkastellaan virtausominaisuuksien numeerista ratkaisua ja esi- tellään hila-Boltzmann-virtaussimulointimenetelmä. Sille esitetään parannet- tu reunaehto neste-kiintoaine-rajapinnalle. Monen relaksointiajan menetelmän (MRT) ominaisuuksia tarkastellaan, erityisesti permeabiliteetin viskositeetti- riippuvuutta. Hila-Boltzmann-simulaatto...
Article
Abstract Medical and industrial ultrasound applications, echo sounding, and envi- ronmental,noise are examples,of applications,that can be modelled,with numer- ical calculations of acoustic pressure fields. In this paper, we present two meth- ods for solving these kind of applications,of computational,acoustics with the Helmholtz,equation. The firs...

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