95 citations · 450 across the 43 of their papers we have counts for
6 papers · 1 filter
Suppression of chaos by weak resonant excitations in a nonlinear oscillator with a non-symmetric potential
Grzegorz Litak, Arkadiusz Syta, Marek Borowiec
We examine the Mielnikov criterion for transition to chaos in case of one degree of freedom nonlinear oscillator with non symmetric potential. This system subjected to an external…
Variations of Pairing Potential and Charge Distribution in Presence of a Non-magnetic Impurity
Grzegorz Litak
Using an attractive Hubbard model we examine spatial variations of superconducting order parameter and local charge on a two dimensional lattice. For various band filling we show t…
'Pi State' Induced by Impurities with a Repulsive Interaction
Grzegorz Litak, Mariusz Krawiec
We study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a re…
A Numerical Study of a Simple Stochastic/Deterministic Model of Cycle-to-Cycle Combustion Fluctuations in Spark Ignition Engines
G. Litak, M. Wendeker, M. Krupa +1
We examine a simple, fuel-air, model of combustion in a spark ignition (si) engine with indirect injection. In our two fluid model, variations of fuel mass burned in cycle sequence…
Dynamics of a Gear System with Faults in Meshing Stiffness
Grzegorz Litak, Michael I. Friswell
Gear box dynamics is characterised by a periodically changing stiffness. In real gear systems, a backlash also exists that can lead to a loss in contact between the teeth. Due to t…
Estimation of a Noise Level Using Coarse-Grained Entropy of Experimental Time Series of Internal Pressure in a Combustion Engine
Grzegorz Litak, Rodolfo Taccani, Krzysztof Urbanowicz +3
We report our results on non-periodic experimental time series of pressure in a single cylinder spark ignition engine. The experiments were performed for different levels of loadin…