Janusz Frączek
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View article: Reaction uniqueness problem in the divide-and-conquer approach
Reaction uniqueness problem in the divide-and-conquer approach Open
When overconstrained multibody mechanisms are modeled as rigid body systems, some or all of the reaction forces are non-unique, which may affect other simulation results, making them incorrect. Despite this global ambiguity, unambiguously …
View article: Reaction Uniqueness Problem in the Divide-and-Conquer Approach
Reaction Uniqueness Problem in the Divide-and-Conquer Approach Open
When overconstrained multibody mechanisms are modeled as rigid systems, some or all of the reaction forces are non-unique, which may affect other simulation results, making them incorrect. Despite this global ambiguity, unambiguously deter…
View article: Divide-and-conquer-based approach for the reaction uniqueness analysis in overconstrained multibody systems
Divide-and-conquer-based approach for the reaction uniqueness analysis in overconstrained multibody systems Open
For rigid multibody systems with redundant constraints, mathematical modeling and physical interpretation of the obtained results are impeded due to the nonuniqueness of the calculated reactions, which—in the case of load-dependent joint f…
View article: Joint–coordinate adjoint method for optimal control of multibody systems
Joint–coordinate adjoint method for optimal control of multibody systems Open
This paper presents a joint–coordinate adjoint method for optimal control of multi-rigid-body systems. Initially formulated as a set of differential-algebraic equations, the adjoint system is brought into a minimal form by projecting the o…
View article: COVID-19 Diagnosis based on Taste Disorders: A Case-Control Study
COVID-19 Diagnosis based on Taste Disorders: A Case-Control Study Open
Background: We aimed to assess taste disturbances in COVID-19 patients. Additionally, we hypothesized that it is possible to establish a reliable and inexpensive screening method for SARS-COV-2 infection using a flavor test.
View article: Sensitivity and specificity of prediction models based on gustatory disorders in diagnosing COVID-19 patients: a case-control study
Sensitivity and specificity of prediction models based on gustatory disorders in diagnosing COVID-19 patients: a case-control study Open
Objective to quantitatively assess disturbances of sweet, sour and salty and bitter tastes in a group of young, asymptomatic or oligosymptomatic COVID-19 patients; establish a reliable, sensitive and specific test that can diagnose COVID-1…
View article: Evaluation of parallel efficiency in modeling of mechanisms using commercial multibody solvers
Evaluation of parallel efficiency in modeling of mechanisms using commercial multibody solvers Open
Parallel computers are becoming more available. The natural way to improve computational efficiency of multibody simulations seems to be parallel processing. Within this work we are trying to estimate the efficiency of parallel computation…
View article: Volumetric locking suppression method for nearly incompressible nonlinear elastic multi-layer beams using ANCF elements
Volumetric locking suppression method for nearly incompressible nonlinear elastic multi-layer beams using ANCF elements Open
The analysis and solution of many modern flexible multibody dynamic problems require formulations that are able to effectively model bodies with nonlinear materials undergoing large displacements and deformations. The absolute nodal coordi…
View article: Comparison of natural complement formulations for multibody dynamics
Comparison of natural complement formulations for multibody dynamics Open
The main aim of this paper is to compare the effectiveness of numerical techniques used for spatial multibody dynamics simulation by...
View article: A parallel Hamiltonian formulation for forward dynamics of closed-loop multibody systems
A parallel Hamiltonian formulation for forward dynamics of closed-loop multibody systems Open
This paper presents a novel recursive divide-and-conquer formulation for the simulation of complex constrained multibody system dynamics based on Hamilton's canonical equations (HDCA). The systems under consideration are subjected to holon…
View article: Comparison of Selected Formulations for Multibody System Dynamics with Redundant Constraints
Comparison of Selected Formulations for Multibody System Dynamics with Redundant Constraints Open
This paper compares selected optimization-based methods for the analysis of multibody systems with redundant constraints. The following numerical schemes are examined: direct integration method, Udwadia-Kalaba formulation, two types of lea…