MTA-BME Lendület (Momentum)

05-10-2023: Research paper has been accepted to PREM

Research paper has been published online in the journal Probabilistic Engineering Mechanics with the title: Collocation method for stochastic delay differential equations.

01-09-2023: Received ÚNKP scholarship on neutral distributed systems

Member of the Momentum Team Andras Bartfai received ÚNKP scholarship on the research topic “Analytical approximation for nonlinear distributed neutral systems”.

20-08-2023: Presentation in the CIRP general Assembly

The PI has presented a work with the title "Flip-validated milling process in hardware-in-the-loop environment" in the CIRP general assembly 2023 in Dublin Ireland .

01-08-2023: Research paper has been published in JCND

Research paper has been published in the Journal of Computational and Nonlinear Dynamics with the title: "Stability Analysis of a One Degree of Freedom Robot Model With Sampled Digital Acceleration Feedback Controller in Turning and Milling".

30-06-2023: Presentation at 10th MESIC conference

A talk was given by Zsolt Iklódi in the Manufacturing Engineering Society International Conference 2023 regarding the 3 dimensional modelling and simulation of broaching processes.

22-06-2023: Presentation at NODYCON conference

A talk was given by Zsolt Iklódi in the Third International Nonlinear Dynamics Conference (NODYCON 2023) regarding the optimization of axial tooth distances in broaching tools.

31-05-2023: Presentation at CIRP CMMO conference

A talk was given by David Hajdu in the 19th CIRP Conference on Modeling of Machining Operations (CIRP CMMO 2023) and a related conference paper has been accepted with the title: Active vibration control for milling operations including frequency response function uncertainties by the authors: David Hajdu and Daniel Bachrathy.

18-05-2023: Presentation at SIAM DS conference

A symposium presentation was given by Zsolt Iklódi in the SIAM Conference on Applications of Dynamical Systems regarding the continuation of periodic orbits in piecewise-smooth delay differential equations.

11-05-2023: Research paper has been accepted to JRNC

Research paper has been published online in the International Journal of Robust and Nonlinear Control with the title: "Control barrier functionals: Safety-critical control for time delay systems".

04-05-2023: The curved uncut chip thickness model

The research paper has been accepted for publication in the prestigious journal (International Journal of Machine Tools and Manufacture) in the field of manufacturing. The title of the paper is: The curved uncut chip thickness model: A general geometric model for mechanistic cutting force predictions

02-01-2023: Research paper has been published in JVC

Research paper has been published in the Journal of Vibration and Control with the title: "Stability analysis of a digital hierarchical steering controller of autonomous vehicles with multiple time delays".

08-12-2022: Research paper has been accepted to IEEE TCST

The research paper has been accepted for publication in the journal of IEEE Transactions on Control Systems Technology with the title: "Safety-Critical Control with Input Delay in Dynamic Environment".

07-12-2022: Research paper has been submitted to IJMTM

A research paper has been submitted for publication in the journal (International Journal of Machine Tools and Manufacture) in the field of manufacturing. The title of the paper is: The curved uncut chip thickness model: A general geometric model for mechanistic cutting force predictions.

06-12-2022: Seminar talk on finite-time stability

Andras Bartfai held a seminar at the Deparment of Applied Mechanics on the finite-time stability of dynamical systems with time dependent parameters.

01-12-2022: Research paper has been published in IJNLM

Research paper has been published in the International Journal of Non-Linear Mechanics with the title: "Hopf bifurcation calculation in neutral delay differential equations: Nonlinear robotic arms subject to delayed acceleration feedback control".

25-11-2022: Visiting the Engineering Acoustics - NVH department at Robert Bosch Kft.

The members of the research group have visited the Engineering Acoustics - Noise Vibration and Harshness (NVH) group at Robert Bosch Kft., led by Fukker Bertalan, organised by the research group leader Zoltan Dombovari and a member of the visited department Zoltan Gabor Gazdagh.

22-11-2022: Seminar talk

A talk was given by Zoltan Gabos at the Applied Mechanics Department (BME) with the title "Measurement methods of nonlinear vibrations: operational resonance decay (ORD), control-based continuation (CBC)".

15-11-2022: Seminar talk on dynamic modelling of broaching

A seminar talk was given by Zsolt Iklódi concerning the dynamic modelling and optimization of broaching operations, at the Department of Applied Mechanics at the Budapest University of Technology and Economics.

14-11-2022: Guest research

A member of the team, Zsolt Iklódi, has received an Erasmus+ Traineeship grant for the spring of 2023 to research piecewise-smooth dynamic systems at the Chalmers University of technology in Gothenburg.

10-10-2022: Research paper has been accepted to NonDyn

Journal paper has been accepted for publication in the journal of Nonlinear Dynamics with the title: "Nonlinear effects of saturation in the car-following model".

29-09-2022: New Lendület project

Giuseppe Habib is awarded with the Lendület grant for the project entitled: "Dynamical integrity assessment of real-life engineering systems"

28-09-2022: TDS 2022 conference

A conference talk was given by David Hajdu in The The 17th IFAC Workshop on Time Delay Systems (TDS 2022) with the title: “Experimental study and numerical simulation of symmetry breaking effect in milling operations”.

27-09-2022: TDS 2022 conference

Two conference talks were given by Adam K. Kiss in The 17th IFAC Workshop on Time Delay Systems (TDS 2022) about safety-critical control with the title: “Control Barrier Functionals: Safety-Critical Control with Time Delay” and "Input-To-State Safety with Input Delay in Longitudinal Vehicle Control".

22-09-2022: Presentation on DAS 2022 Conference about nonlinear dynamics

A poster presentation was given by Zoltan Gabos in The 38th Danubia Adria Symposium (DAS 2022) and a related conference abstract has been accepted with the title: “Control-based continuation: case study on a nonlinear slender beam structure” by the authors: Zoltan Gabos, Zoltan Dombovari.

21-09-2022: Presentation on DAS 2022 Conference

A poster presentation was given by András Bártfai in The 38th Danubia Adria Symposium (DAS 2022) with the title: “Demonstration of optimal tuning measurement of the tuneable clamping table with a polymer workpiece”.

20-09-2022: Research paper has been published online in the International Journal of Non-Linear Mechanics

Journal paper has been published online in the International Journal of Non-Linear Mechanics with the title: "Hopf bifurcation calculation in neutral delay differential equations: Nonlinear robotic arms subject to delayed acceleration feedback control".

13-09-2022: Poster presentation at ISMA 2022 conference on nonlinear dynamical systems

A poster was presented by Zoltan Gabos in The 30th International Conference on Noise and Vibration Engineering (ISMA 2022) and a related conference paper has been accepted with the title: “Case study on experimental identification of single degree of freedom nonlinear mechanical systems” by the authors: Zoltan Gabos, Zoltan Dombovari, Zoltan Gazdagh.

12-09-2022: Paper published in the proceedings of the ISMA 2022 Conference

A paper was published by András Bártfai in the proceedings of ISMA 2022 conference, on the finite-time stability of dynamic stability loss in a single degree of freedom system.

09-09-2022: Stochastic continuation methods for cubic spring characteristics

A journal paper is under revision in the < a target="_blank" rel="noopener noreferrer" href=”https://www.sciencedirect.com/journal/journal-of-sound-and-vibration”> Journal of Sound and Vibration, understanding the time-dependent stability of periodic solutions under stochastic forcing and approximating stable time intervals.

01-09-2022: Received ÚNKP scholarship on nonlinear measurement techniques

Member of the Momentum Team András Bártfai received ÚNKP scholarship on the research topic “Experimental analysis of milling process with time-dependent parameters”.

01-09-2022: Received ÚNKP scholarship for the investigation of piecewise-smooth traffic dynamics

Member of the Momentum Team Zsolt Iklódi received a ÚNKP scholarship on the research topic “Effect of automated vehicles with connected cruise control and accident prevention protocols on global traffic dynamics”.

18-08-2022: Virtual presentation was given in ASME IDETC-2021 Conference

A virtual talk was given by András Bártfai at the 2021 ASME IDETC-CIE conference with the title "Robotic machining applications: delayed acceleration feedback control in milling".

17-08-2022: Presentation at ASME-IDETC 2022 conference about nonlinear dynamics

A talk was given by Zoltan Gabos in The 17th International Conference on Multibody Systems, Nonlinear Dynamics, and Control (MSNDC 2022) and a related extended abstract has been accepted with the title: “Stability analysis of stable branches for a stochastically excited one degree-of-freedom system with cubic geometric nonlinearity” by the authors: Zoltan Gabos, Zoltan Dombovari.

17-08-2022: Paper published in the proceedings of the ASME IDETC-CIE 2022 Conference

A talk was given by Zsolt Iklódi at the ASME IDETC-CIE 2022 conference, on the modelling of in motion machine dynamics, in the presence of dry-friction and controller feedback delay.

16-08-2022: Third place at the MSNDC student paper competition of the ASME IDETC-CIE 2022 Conference

The paper written by Andras Bartfai, Asier Barrios and Zoltan Dombovari won the third place of the student paper competition at the MSNDC student paper competition of the ASME IDETC-CIE 2022 Conference.

16-08-2022: Third place at the MSNDC student paper competition of the ASME IDETC-CIE 2022 Conference

The paper written by Andras Bartfai, Asier Barrios and Zoltan Dombovari won the third place of the student paper competition at the MSNDC student paper competition of the ASME IDETC-CIE 2022 Conference.

15-08-2022: Paper published in the proceedings of the ASME IDETC-CIE 2022 Conference

A talk was given by András Bártfai at the ASME IDETC-CIE 2022 conference, on the stability analysis of a one-degree-of-freedom robot model with sampled digital acceleration feedback controller in milling.

22-07-2022: Extended abstract presentation at ENOC 2022 Conference

A conference talk was given by András Bártfai at ENOC 2022 Conference with the title: “Bistability in nonlinear elastic robotic arms subject to delayed feedback control”.

21-07-2022: ENOC 2022 conference

A talk was given in the 10th European Nonlinear Dynamics Conference (ENOC 2020) about parameter identification in milling with the title “Parameter identification of periodic systems by impulse dynamic subspace description”.

21-06-2022: Research paper has been submitted to JRNC

A journal paper has been submitted to the International Journal of Robust and Nonlinear Control with the title: "Control Barrier Functionals: Safety-critical Control for Time Delay Systems". The journal paper is about the theoretical framework for safety-critical control of nonlinear time-delay system.

20-06-2022: Research paper has been submitted to Journal of Vibration and Control

Journal paper has been submitted for publication in the Journal of Vibration and Control with the title: "Stability analysis of a digital hierarchical steering controller of autonomous vehicles with multiple time delays".

04-05-2022: Research paper has been accepted to NonDyn

Research paper has been accepted for publication in the journal of Nonlinear Dynamics with the title: "Bifurcations analysis in implicit maps through the dynamics of cumulated surface errors in milling". The paper is about the mathematical tool of bifurcation analysis for implicit maps and its application to the interaction of surface errors.

07-03-2022: Research paper has been accepted to NonDyn

Journal paper has been published in the journal of Nonlinear Dynamics with the title: "Bistability and delayed acceleration feedback control, analytical study of collocated and non-collocated cases".

12-02-2022: Research paper has been accepted to JSV

Research paper has been accepted for publication in the Journal of Sound and Vibration with the title: "In-process impulse response of milling to identify stability properties by signal processing".

20-01-2022: Bi-stability in boring operations due to TMD impacts

A journal paper was published in the Journal of Sound and Vibration, concerning the bi-stable zones on the stability maps of cutting with boring bars with enclosed tuned mass dampers.

09-01-2022: Received ÚNKP scholarship on nonlinear measurement techniques

Member of the Momentum Team Zoltan Gabos received ÚNKP scholarship on the research topic “Extension of parameter identification technique considering near linear varying damping on a vibrating mechanical system with geometric nonlinearity”.

16-12-2021: Research paper has been submitted to IEEE TCST

Research paper has been submitted to IEEE Transactions on Control Systems Technology with the title: "Safety-Critical Control with Input Delay in Dynamic Environment". The paper is about guaranteeing safety in the presence of input delay by accounting for the evolution of the environment (arXiv)/a>.

14-12-2021: BME - KIT seminar talk

A seminar talk was virtually given by Adam Kiss in the BME - Karlsruhe Institute of Technology joint seminar series with the title: "Safety-Critical Control Design for Time Delay Systems".

01-11-2021: The curved uncut chip thickness model

The curved uncut chip thickness model is presented to predict the cutting forces for general uncut chip geometries. The concept of the model is published in a technical report (arXiv).

30-09-2021: TDS 2021 conference

A talk was virtually given by Adam Kiss in The 16th IFAC Workshop on Time Delay Systems (TDS 2021) and a relating extended abstract has been accepted with the title: “Safety-Critical Control Design for Time Delay Systems Using Control Barrier Functionals”, by the authors: Adam K. Kiss, Tamas G. Molnar, Aaron Ames and Gabor Orosz.

30-09-2021: TDS 2021 conference

A talk was virtually given by Tamas G Molnar in The 16th IFAC Workshop on Time Delay Systems (TDS 2021) and a relating extended abstract has been accepted with the title: “Synthesizing Safety-Critical Controllers for Systems with Input Delay”, by the authors: Tamas G. Molnar, Adam K. Kiss, Aaron Ames and Gabor Orosz.

30-09-2021: CompactRIO Controller

The research group has acquired an NI CompactRIO 9039 FPGA Controller in order to develop active chatter controller designs.

30-09-2021: Online talk was given in TDS 2021 Conference

A virtual talk was given by András Bártfai at the TDS 2021 Conference with the title "A case study on the stabilization of advanced delay differential equations with digital controllers".

09-09-2021: Research paper has been accepted to MMSJ

Research paper has been accepted for publication in the Special Issue of the MM Science Journal relating to the CIRP HSM2021 Conference with the title: "Dynamic characterization of milling based on interrupted feed motion".

09-09-2021: Research paper has been accepted to MMSJ

Research paper has been accepted for publication in the Special Issue of the MM Science Journal relating to the CIRP HSM2021 Conference with the title: "Chatter detection based on a contact sensor in milling operations".

18-08-2021: ASME IDETC-2021 Conference

A virtual talk was given by Zsolt Iklódi at the 2021 ASME IDETC-CIE conference on the analytic stability analysis of highly interrupted broaching.

17-08-2021: Research paper has been submitted to JSV

Research paper has been submitted to the Journal of Sound and Vibration with the title: "In-process impulse response of milling to identify stability properties by signal processing". The paper is about perturbation during machining and tracing the multipliers.

25-05-2021: ACC2021 conference

A talk was virtually given in The 2021 American Control Conference about safety critical control systems with the title “Certifying Safety for Nonlinear Time Delay Systems Via Safety Functionals: A Discretization Based Approach”.

24-03-2021: Member of the team has recieved

Henrik T. Sykora has successfully defended his PhD dissertation titled: Dynamics of Stochastic Mechanical Systems with Delays. The supervisor was Daniel Bachrathy also a member of the team.
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05-03-2021: A research paper has been submitted to IEEE Control Systems Letters (L-CSS)

A journal paper has been submitted to IEEE Control Systems Letters (L-CSS) with the title: "Predict the Future to Avoid Danger: Synthesizing Safety-Critical Controllers with Input Delay".

25-02-2021: A research paper has been submitted to Nonlinear Dynamics

A journal paper has been submitted to Nonlinear Dynamics
with the title: "Bifurcations in implicit map: dynamics of cumulated surface errors in milling". The journal paper is about bifurcation analysis of surface errors.

11-01-2021: Research paper has been accepted to IJMTM

The research paper of the PI has been accepted for publication in the prestigious journal (International Journal of Machine Tools and Manufacture) in the field of manufacturing. The title of the paper is:

Stability Properties of Regenerative Cutting Processes, based on Impulse Response Functions expressed in the Impulse Dynamic Subspace

10-01-2021: A research paper has been submitted to CIRP Annals

The research paper has been submitted for publication in the prestigious journal CIRP Annals Manufacturing Technology. The title of the paper is:

Why is it hard to identify the onset of chatter? A stochastic resonance perspective

21-09-2020: Paper has been published online related to Kalman Filtering using FRF signals

A journal paper was published in the international journal of Sensors about how to apply Kalman filtering for using force dynamometers. The online version of the paper can be downloaded here with the title "Upgraded Kalman Filtering of Cutting Forces in Milling".

15-09-2020: Discretization of safety functionals for delay systems

A journal paper was submitted to IEEE Control Systems Letters (L-CSS) with the title: "Certifying Safety for Nonlinear Time Delay Systems via Safety Functionals: A Discretization Based Approach". The journal paper is about safety sets for nonlinear time-delay systems.

09-08-2020: Cutting force tests on titanium

Orthogonal cutting force measurements are performed on titanoum alloy Ti6Al4V using a Kistler dynamometer 9129AA.

07-08-2020: Stochastic Semi Discretization

A journal paper was accepted for publication in Applied Mathematical Modelling with the title: "Stochastic Semidiscretization Method: Second Moment Stability Analysis of Linear Stochastic Periodic Dynamical Systems with Delays" by Henrik Sykora and Dániel Bachrathy.

03-08-2020: Monitoring of Changing Dynamics

A journal paper was publised in Journal of Manufacturing and Materials Processing with the title: "In-Process Monitoring of Changing Dynamics of a Thin-Walled Component During Milling Operation by Ball Shooter Excitation".

10-07-2020: The basics of IDS framework has been published in JMMP

The main idea behind implementing response function measurement directly in stability calculation was presented in the special issue about Machine Tool Dynamics in JMMP. The title of the paper is "The Basics of Time-Domain-Based Milling Stability Prediction Using Frequency Response Function".

28-06-2020: A new cutting force model is on the way!

New cutting force models are being developed for general cutting operations. The first tests and parameter identifications are already performed. The new model is under investigation now.

05-05-2020: StochasticDelayDiffEq.jl

The StochasticDelayDiffEq.jl Julia package is now available and can be used for the numerical simulations of stochastic delay differential equations (e.g. stochastic models of machining [1], delay SIR epidemiology models considering stochastic perturbations [2,3]). This package can utilise a wide range of stochastic integrators, e.g., the Euler-Maruyama method, the implicit Runge-Kutta Milstein method, or even stabilised SROCK methods, to solve SDDEs. Furhtermore, the package can out-of-the-box use features from the DifferentialEquations.jl ecosystem, such as Monte-Carlo simulation and their statistical evaluation.

23-04-2020: Conference on COVID-19 organized by the Ministry for Innovation and Technology

Scientific conference organized by the Ministry for Innovation and Technology presents defense strategies and the current state of research. The online conference (in Hungarian) can be viewed on Youtube.

14-04-2020: Domain acquisition

The research group has acquired the conwib.com domain.
We'll have a super-fancy web application there, it's only a matter of time now!

14-04-2020: Harmonically Varied Helix Milling Tools

A journal paper was accepted for publication in Journal of Manufacturing Science and Engineering with the title: “The Effect of Geometry on Harmonically Varied Helix Milling Tools” by Markel Sanz, Alexander Iglesias, Jokin Muñoa and Zoltan Dombovari.

31-03-2020: 59th IEEE CDC conference

Proceeding paper was submitted to the 59th IEEE CDC conference with the title: "Computing Safety Sets for Nonlinear Delayed Systems via Spectral Projections and Discretization". The proceeding paper is about safety sets for delayed systems.

18-03-2020: Pseudospectral method for time-periodic systems

A journal paper was accepted for publication in the International Journal for Numerical Methods in Engineering with the title: “Pseudospectral method for assessing stability robustness for linear time-periodic delayed dynamical systems” by Francesco Borgioli, David Hajdu, Tamas Insperger, Gabor Stepan and Wim Michiels. This paper deals with parametric uncertainties in different class of delayed systems.

11-02-2020: PhD defense of David Hajdu

David Hajdu has successfully defended his PhD dissertation entitled Robust stability of delayed dynamical systems. The supervisor was Tamas Insperger.

28-01-2020: ENOC abstract

Abstract has been submitted to the 10th European Nonlinear Dynamics Conference (ENOC 2020) about a fast stability calulation for delayed systems.

28-01-2020: Dexel based CWE computation

The first development steps of a Dexel based material removal simulator is ready. This method will be used to follow the changing geometry of the workpiece and to compute the Cutter-Workpiece-Engagement map.

23-01-2020: Server acquisition

The research group has acquired a high-performance server in order to accelerate complex computations and provide a back-end to web based vibration analytics.

08-01-2020: ENOC abstract

Abstract has been submitted to the 10th European Nonlinear Dynamics Conference (ENOC 2020) about IDS based milling stability estimation.

07-01-2020: ENOC abstract

Abstract has been submitted to the 10th European Nonlinear Dynamics Conference (ENOC 2020) about bistability phenomena in elastic robotic machining.

26-12-2019: A robust pseudospectral approach

A journal paper was accepted for publication in the International Journal of Machine Tools and Manufacture with the title: “Robust stability of millin operations based on pseudospectral approach” by David Hajdu, Francesco Borgioli, Wim Michiels, Tamas Insperger and Gabor Stepan. View article.

15-12-2019: Sykora's ENOC abstract

Abstract has been submitted to the 10th European Nonlinear Dynamics Conference (ENOC 2020) about a numerical solver ecosystem for stochastic delay differential equations.

15-12-2019: ENOC abstract

Abstract has been submitted to the 10th European Nonlinear Dynamics Conference (ENOC 2020) about parameter identification in milling.

10-12-2019: CDC conference

Adam K Kiss participated in the 58th IEEE Conference on Decision and Control in Nice, France, where he met with prominent researchers in the field.

20-11-2019: J. Manuf. Sci. Eng. paper

A journal paper was accepted for publication in Journal of Manufacturing Science and Engineering with the title: “Effects of Varying Dynamics of Flexible Workpieces in Milling Operations ” by Adam K. Kiss, Daniel Bachrathy and Gabor Stepan. The research was partially supported by ERC SIREN. View article

Intellectual Property Rights

The research is funded 100% public money. The researchers intend to disseminate all of the results. All of these results will be accessible for the public through the webpage and repository systems like MTMT. No industrial information from the partners can exchange through the Lendület (Momentum) project, and no industrial information can go to other industrial entities. The results that is produced by the project can be used for educational purposes under the logo of NKFI and/or ELKH. All publications originated from the Lendület project contains the acknowledgement for NKFI and/or ELKH.