Daniel Serfozo

57955420900

Publications - 5

An effective reduction method with Caughey damping for spurious oscillations in dynamic problems

Balázs Pere Daniel Serfozo

Publication Name: Meccanica

Publication Date: 2025-09-01

Volume: 60

Issue: 9

Page Range: 2927-2946

Description:

The numerical solution of dynamic problems often results spurious oscillations. In order to eliminate them, a damping effect must be included in the numerical scheme. However, the concrete shape of the damping characteristics has a great importance in the efficiency of oscillation reduction. In this article, a novel approach has been introduced with adjustable damping character. The damping effect is exerted as viscous damping according to the formulation of Caughey damping. Using the proposed method, a wide range of damping curves can be approximated with high accuracy. The newly developed method is mainly useful for contact-impact and wave propagation problems.

Open Access: Yes

DOI: 10.1007/s11012-025-02036-9

Application Analysis of a Novel Reduction Method for Spurious Oscillations in 2D Impact Problems

Balázs Pere Daniel Serfozo

Publication Name: Advances in Transdisciplinary Engineering

Publication Date: 2024-01-01

Volume: 59

Issue: Unknown

Page Range: 231-239

Description:

The numerical solution of impact problems are oftentimes problematic due to the presence of spurious oscillations in the resulting functions. Eliminating these oscillations is complicated and requires a damping effect to be exerted in the solution. In the proposed method, viscous damping has been applied with a special damping character. Using this scheme, the numerical solution of 2D impact problems contains significantly less oscillations compared to other widely applied methods. In quantitative terms, an improvement of 2.42% and 9.29% or more can be achieved in the time evolution of the velocity and the pressure, respectively.

Open Access: Yes

DOI: 10.3233/ATDE240550

An Improved Bulk Viscosity Method for Contact-Impact Problems

Balázs Pere Daniel Serfozo

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2024-01-01

Volume: 21

Issue: 8

Page Range: 243-262

Description:

Dynamic contact and impact problems are widely applicable. An accurate solution for these kinds of problems could be used in many fields of mechanical engineering (e.g., cutting metalwork, cogwheel drives, etc.). However, the proper handling of the contact is problematic, as there emerges a substantial amount of nonlinearity in the displacement field. Therefore, a spurious high frequency oscillation is present in the solution. These oscillations must be avoided, as divergence can easily occur in the contact algorithm due to them. In order to eliminate this effect, the applied numerical method must be chosen and set properly. In this study, we focused on the best possible elimination of these oscillations by which the choice of the proper numerical method has a great importance.

Open Access: Yes

DOI: 10.12700/APH.21.8.2024.8.13

A method to accurately define arbitrary algorithmic damping character as viscous damping

Balázs Pere Daniel Serfozo

Publication Name: Archive of Applied Mechanics

Publication Date: 2023-09-01

Volume: 93

Issue: 9

Page Range: 3581-3595

Description:

Undesired oscillations often emerge in numerical solutions, especially in the case of dynamic problems. These are mainly spurious oscillations which must be eliminated or reduced at least to provide accurate results. Numerical methods with damping effect are especially useful to achieve this goal. However, the concrete shape of the damping characteristics has a great impact on the effectiveness. Dissipative numerical methods mostly have a specific damping character with very limited alteration possibility. In this article, a novel numerical method has been introduced where the dissipative effect is exerted via viscous damping. Using the proposed method, a great variety of damping curves can be defined accurately, straight through the determination of the algorithmic damping ratio. The newly developed technique is mainly useful for applications where the shape of the damping characteristics significantly affects the accuracy.

Open Access: Yes

DOI: 10.1007/s00419-023-02454-9

Application analysis of time stepping methods for impact problems

Balázs Pere Daniel Serfozo

Publication Name: Pollack Periodica

Publication Date: 2022-12-31

Volume: 17

Issue: 3

Page Range: 30-35

Description:

Dynamic contact and impact problems are widely applicable. An accurate solution method for these kinds of problems can be used in many fields of mechanical engineering (e.g., cutting metalwork, cogwheel drives, etc.). However, the proper handling of the contact is problematic, as there emerges a substantial amount of nonlinearity in the displacement field. Therefore, a spurious high frequency oscillation is present in the solution. These oscillations must be avoided, as divergence can easily occur in the contact algorithm due to them. In order to eliminate this effect, the applied numerical method must be chosen and set properly. In this study, a comprehensive guide is provided for the appropriate selection of the proper numerical method and its parameters.

Open Access: Yes

DOI: 10.1556/606.2022.00599