2023 - Repozytorium publikacji - Politechnika Gdańska

Pokaż publikacje z roku

Publikacje z roku 2023

Pokaż wszystkie

Financial aspects of supporting Ukrainian refugees
- Krystyna Gomółka
- Piotr Kasprzak
2023
Warfare in Ukraine meant that in 2022 many countries, including Poland and other European, focused mainly on helping refugees from Ukraine and humanitarian transports. The assistance took on various forms - from basic humanitarian support, through in-kind help, financial and military assistance. Poland launched its humanitarian aid in the first days of the conflict. The aid provided by each country varies. It should be noted, however, that in each case it is possible to quantify it economically, i.e. to determine its scope, role and importance, and above all, its economic (financial) dimension. The aim of this article is to present various forms of assistance from European countries, with particular emphasis on Poland. As part of the research, the latest available literature on the subject, industry reports and sometimes press articles were used.
Financial Consequences of the Introduction of the Fit For 55 on the Example of Poland
- Justyna Kujawska
- Piotr Kasprzak
2023
In Europe and in Poland, there is a growing conviction that climate action is a necessity. When creating long-term strategies or making current decisions, companies are increasingly taking into account issues related to sustainable development and reducing CO2 emissions. Following the signing of the Paris Agreement in 2015, countries around the world pledged to reduce greenhouse gas emissions by 2050 so that the average temperature increase does not exceed 2°C, with the ambition to reach 1.5°C. EU countries have agreed to tighten climate regulations by adopting and implementing the Fit For 55 package. The aim of this study is to present the financial consequences of the introduction of the Fit For 55 package of regulations. The Fit for 55 package is related to Europe's energy transition and is at the initial stage of implementation, hence the lack of broader studies on the subject. The research method includes an analysis of available reports estimating the economic impact of the Fit for 55 package and statistical information. The research shows that the costs of Polish's energy transformation will be very high (over € 500 billion), which is only an estimate, taking into account the current level of prices and knowledge, because many technologies to be used are only at the research stage. For most EU countries, this will entail the introduction of new taxes, fees, as well as legal and administrative restrictions, which will undoubtedly result in higher prices of individual goods and services. In addition, the introduced regulations will lead to the cessation of the use of certain technologies, e.g. combustion cars, coal-fired power plants, or a reduction in the turnover of, for example, real estate that does not meet certain energy efficiency requirements.
Finite element modeling of plastic hinges based on ductility demand-capacity method using nonlinear material for dynamic analysis
- Karol Grębowski
- Krzysztof Wilde
- Mikołaj Miśkiewicz
2023 Pełny tekst INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
The article discusses modeling plastic hinges in reinforced concrete interme-diate supports using finite elements methods. The ductility demand-capacitymethod was used to determine the geometrical parameters of cross-section plas-ticization zones, their ability to move and rotate, as well as their ductility. Dueto the varied geometry and stiffness of the supports and their nonlinear behav-ior under dynamic load, this method was concluded to be imperfect. Therefore,an improved algorithm was proposed by determining the main parameters ofplastic hinges depending on the degree of concrete degradation according toLubliner’s assumptions. The new algorithm has been implemented in the formof mathematical equations. It was subsequently used, at the structure designstage, to perform numerical calculations based on the finite element method.
Fire-induced spalling of ultra-high performance concrete: A systematic critical review
- Mugahed Amran
- Gunasekaran Murali
- Marzena Kurpińska
- Moncef L. Nehdi
2023 CONSTRUCTION AND BUILDING MATERIALS
Ultra-high performance concrete (UHPC) is a novel concrete class characterized by a compressive strength of more than 150 MPa. One of the most significant drawbacks of employing UHPC is that is very low permeability owing to its great compactness of dense structure increases the risk of fire-induced spalling. It is challenging for fire safety and structural engineers to predict and analyze this issue due to the lack of widely accepted and reliable models for concrete spalling. Therefore, understanding the fire-spalling characteristics of UHPC exposed to high temperature or fire is vital for ensuring the safety of a UHPC-based structural fire design. To date, the fireinduced spalling behaviour of UHPC has not been thoroughly investigated. To address this informational gap, this article aims to assess various aspects of UHPC by focusing on fire-induced spalling and its influencing factors, spalling mechanism, microstructure characterization, prevention measures, and mitigation strategies. Moreover, this critical review summarizes and evaluates the results of thermal spalling tests and fire-induced spalling modeling undertaken on UHPC in developing a manual regulation protocol. This paper aims to provide insights into improving the existing design guidelines for the fire-spalling-resistant design of UHPC members, this facilitating wide-scale adoption of robust and sustainable UHPC. Given the merits of the study topic, the review strategies and initiatives can then be leveraged to give insight into areas that will be highly beneficial for future experiments and research of UHPC applications by research centers and construction industries globally.
Flexible syngas-biogas-hydrogen fueling spark-ignition engine behaviors with optimized fuel compositions and control parameters
- Van Ga Bui
- Thi Minh Tu Bui
- Van Nam Tran
- Zuohua Huang
- Anh Tuan Hoang
- Wiesław Tarełko
- Van Hung Bui
- Xuan Mai Pham
- Phuoc Quy Phong Nguyen
2023 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
This paper presents the results research on the optimal fuel compositions and the control parameters of the spark ignition engine fueled with syngas-biogas-hydrogen for the purpose of setting up a flexible electronic control unit for the engine working in a solar-biomass hybrid renewable energy system. In syngas-biogas-hydrogen mixture, the optimal content of hydrogen and biogas is 20% and 30%, respectively. Exceeding these thresholds, the improvement of engine performance is moderate, but the pollution emission increases strongly. The optimal advanced ignition angle is 38°CA, 24°CA, and 18°CA for syngas, biogas, and hydrogen, respectively. With the same content of hydrogen or biogas in the mixture with syngas, the advanced ignition angle of the hydrogen-syngas blend is less than that of the syngas-biogas blend by about 4°CA at the engine speed of 3000 rpm. The derating power of the engine is 30% and 23% as switching from the hydrogen and biogas fueling mode to the syngas fueling mode, respectively. However, NOx emission of the engine increase from 200 ppm (for syngas) to 2800 ppm (for biogas) and to over 6000 ppm (for hydrogen). The optimal advanced ignition angle, the optimal equivalence ratio of the syngas-biogas-hydrogen fuel mixture vary within the limits of the respective values for syngas and hydrogen. To improve the engine efficiency and reduce pollutant emissions, the loading control system of the engine should prioritize the adjustment of the fuel flow and then the adjustment of the air-fuel mixture flow.
Flood Modelling and Risk Analysis of Cinan Feizuo Flood Protection Area, Huaihe River Basin
- Umar Farooq
- Abubakr Taha Bakheit Taha
- Fuchang Tian
- Ximin Yuan
- Muhammad Ajmal
- Irfan Ullah
- Mahmood Ahmad
2023 Pełny tekst Atmosphere
This study evaluated multiple aspects of flood risks and effects on the Cinan Feizuo flood protection area in the Huaihe River basin. Flooding remains a leading problem for infrastructure, especially in urban, residential areas of the region. Effective flood modeling for urbanized floodplains is challenging, but MIKE (ID-2D) is paramount for analyzing and quantifying the risk in the vulnerable region. The Saint-Venant equation and a one-dimensional (1D) MIKE 11 model were used to understand the flood dynamics in the Huaihe River, and a two-dimensional (2D) MIKE 21 model was applied to assess the risk in the Cinan Feizuo flood protection area. The finite volume method (FVM) was used for discrete grid problems, and the models were coupled through the weir equation to find the flow volume from the 1D domain to the 2D domain to investigate water level changes. Flood inundation maps were generated for the flood protection area. The maximum discharge, velocity, and submerged depth for 50- and 100-year flood events were assessed with flood risk. Chenbei indicated a high flood risk level in 50 to 100 years in which the water level exceeds a high level and inundates the maximum area with minimum time. Conversely, the 100-year flood inundation in the flood protection area was comparatively higher than the 50-year flood, with a lower time step. The risk analysis identified significant damage caused by the flood over the target regions. The findings of this study provide technical support for flood risk analysis and loss assessment within the flood protection area and have important reference values for regional flood control, disaster reduction decision making, and constructive planning.
Flow boiling of R1233zd(E) in a 3 mm vertical tube at moderate and high reduced pressures
- Michał Pysz
- Dariusz Mikielewicz
2023 Pełny tekst EXPERIMENTAL THERMAL AND FLUID SCIENCE
The results of flow boiling of R1233zd(E) in a 3 mm vertical stainless steel tube are presented at moderate and high saturation temperatures. Integral flow characteristics in the form of pressure drop and heat transfer coefficient are discussed for saturation temperatures ranging from 115 to 145 °C (corresponding reduced pressures from 0.2 to 0.7), mass velocity of 800 kg/m2s and heat flux of 20 kW/m2. All of the obtained heat transfer trends initially decrease with vapor quality and then do not change or increase with vapor quality. The decrease is connected to the dominance of the nucleate boiling phenomenon. The subsequent increase in heat transfer indicates the increased effect of convective boiling. The rate of the increase depends on the value of reduced pressure (the smaller the reduced pressure the higher the rate). The obtained data have been compared with the predictions of the in-house model and some well-known two-phase flow correlations. The in-house model predictions presented the highest accuracy, with MAPE equal to 23.17 % for R1233zd(E) and 19.23 % for R245fa (data from literature).
Flow Maps and Flow Patterns of R1233zd(E) in a Circular Minichannel at Low, Medium and High Values of Saturation Pressure
- Stanisław Głuch
- Michał Pysz
- Dariusz Mikielewicz
2023 Pełny tekst
There is a gap in knowledge regarding the flow pattern of low-boiling working fluids in the range of high saturation temperatures (above 120°C) and medium and high reduced pressures (0.5-0.9). Data are present in the literature for similar values of reduced pressures, but for lower values of saturation temperature. This is due to the existing refrigeration applications of these working fluids. At high values of reduced pressure, the density of the gas phase is relatively high, and the density of the liquid phase is low. There is a low specific volume difference between the liquid and gas phases. The liquid phase has a low surface tension value. The gas phase has a relatively high viscosity, and the liquid phase has a reduced value of viscosity. These changes in the parameters of refrigerants cause significant differences in flow structures. At a low value of reduced pressure, 0.2, the occurrence of annular flow was observed already at a quality of 0.07 for a mass velocity of G=355 [kg/(m^2·s)], while for a reduced pressure of 0.8, annular flow occurs much later, at a quality of 0.47 for the same mass velocity. Mass velocity flow maps in a function of quality for constant values of reduced pressure and flow maps for reduced pressure as a function of quality at constant mass velocity are presented. Flow maps are compared with correlations for transition lines between intermittent and annular flow structures from literature. Authors new correlation for transition line for researched conditions is presented. New prediction method is the only one which managed to predict transition to annular flow at high values of reduced pressure for collected experimental data.
Fluid–solid interaction on a thin platelet with high-velocity flow: vibration modelling and experiment
- Piotr Ziolkowski
- Tomasz Ochrymiuk
- Victor Eremeev
2023 Pełny tekst CONTINUUM MECHANICS AND THERMODYNAMICS
The paper concerns the nonlinear behaviour of a thin platelet that is streamlined in an aerodynamic tunnel. The air velocity in the aerodynamic tunnel was at 858.9 km/h or 0.7 Ma (Ma—Mach number is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound). This experiment was numerically simulated using FSI (fluid–solid interaction) tools, namely the coupling between the strength and flow code. The strength code uses the finite element method, while the flow code is based on the finite volume method. The coupling between the codes was made by means of an interface that transmitted the relevant data and results between the two codes. The paper discusses the methodology of this coupling. The study also highlights the phenomena occurring during the interaction of flow with the plate with emphasis on their nonlinear character.
FORECASTING BIOGAS FORMATION IN LANDFILLS
- Zbigniew Kneba
- Jacek Kropiwnicki
- Jakub Hadrzyński
- Maciej Ziółkowski
2023 Pełny tekst Acta Mechanica et Automatica
: The aim of the present research was to develop a mathematical model for estimating the amount of viscous gas generated as a function of weather conditions. Due to the lack of models for predicting gas formation caused by sudden changes in weather conditions in the literature, such a model was developed in this study using the parameters of landfills recorded for over a year. The effect of temperature on landfill gas production has proved to be of particular interest. We constructed an algorithm for calculating the amount of the produced gas. The model developed in this study could improve the power control of the landfill power plant.
Four Degree-of-Freedom Hydrodynamic Maneuvering Model of a Small Azipod-Actuated Ship With Application to Onboard Decision Support Systems
- Mathias Marley
- Roger Skjetne
- Mateusz Gil
- Przemysław Krata
2023 Pełny tekst IEEE Access
The main contribution of this paper is a numerical ship motion model of NTNU’s research vessel Gunnerus, capturing the surge, sway, roll, and yaw dynamics when sailing in uniform and steady currents. The model utilizes a crossflow drag formulation for the transverse viscous loads, and it includes a nonlinear formulation for the propulsion and steering loads provided by two azipod thrusters. A wide range of experimental data obtained from sea trials are used for model calibration and validation. The model is intended for development of Decision Support Systems (DSS) that provide the helmsman with recommendations for safe maneuvers. As a demonstration, the model is used to generate input to a previously proposed DSS solution, which uses offline simulations to create a database of the critical navigation area for different encounter scenarios. Additionally, we propose a DSS solution that uses online simulations to predict the future ship trajectory under guidance of a virtual autopilot. The virtual autopilot is designed using a novel hybrid control barrier function formulation to predict the need of evasive maneuvers for collision avoidance.
Fractographical quantitative analysis of EN-AW 2024 aluminum alloy after creep pre-strain and LCF loading
- Wojciech Macek
- Adam Tomczyk
- Ricardo Branco
- Michał Dobrzyński
- Andrzej Seweryn
2023 ENGINEERING FRACTURE MECHANICS
This paper explores the applicability of a new damage parameter combining both fracture surface topography and loading features to estimate the fatigue lifetime under creep pre-strain and low-cycle fatigue loading. Fractures of EN-AW 2024 aluminum alloy caused by mixed creep and low-cycle fatigue loading are experimentally characterized and quantified via surface topography analysis. The specimens were preliminary damaged in a creep process at elevated temperature (100 °C, 200 °C, or 300 °C) considering two strain levels for each temperature. The specimens with preliminary damage were then subjected to fatigue tests at room temperature. The post-failure fracture surfaces were examined with an optical profilometer, and the focus was placed on the relationship between the creep-fatigue damage and the associated fracture surface topography parameters. In addition, an original fatigue life prediction model based on both the surface topography values and the applied strains was proposed and verified. The proposed model can be helpful for post-mortem analysis of engineering components subjected to fatigue loading accounting for creep pre-strain.
Fractographic-fractal dimension correlation with crack initiation and fatigue life for notched aluminium alloys under bending load
- Wojciech Macek
- Dariusz Rozumek
- Sebastian Faszynka
- Ricardo Branco
- Shun-Peng Zhu
- Reza Masoudi Nejad
2023 Pełny tekst ENGINEERING FAILURE ANALYSIS
In this study, fatigue fracture surfaces of aluminium alloy 2017-T4 notched specimens were investigated under cyclic bending to find an alternative failure loading index.. The surface topographies were measured on the entire fracture area with an optical profilometer for different loading conditions. Fatigue crack initiation life Ni and total fatigue life Nf were examined using standard surface topography parameters (such as, root mean square height Sq, arithmetical mean height Sa, maximum height Sz) and non-standard surface topography parameters (such as, fractal dimension Df). Fatigue life assessment was successfully performed by combining both fracture surface topography and stress state features. The results show that the fracture plane geometry, expressed by the fractographic-fractal dimension, can facilitate the estimation of post-failure loading history.
Fracture Surface Topography Parameters for S235JR Steel Adhesive Joints After Fatigue Shear Testing
- Andrzej Kubit
- Wojciech Macek
- Władysław Zielecki
- Paulina Szawara
- Mariusz Kłonica
2023 Pełny tekst Advances in Science and Technology Research Journal
This paper presents the experimental results of a study investigating the effect of holes and notches made on the overlap ends on the strength of adhesive joints. Single-lap joints made of S235JR steel sheets bonded with Araldite 2024-2 epoxy adhesive were tested. For comparative reasons, static shear strength tests and high-cycle fatigue strength tests were performed. Adhesive-filled joints having three holes, each with a diameter of 3 mm, and notches, each 3 mm wide and 4 mm long, were tested and compared with reference joints, i.e. without modification. The assumption was to determine whether the structural modifications would reduce the peak peel and shear stresses that are typical of this type of joints. Results of the static strength tests showed no significant effect of the applied modifications on the strength of the joints. However, in terms of fatigue strength, the results demonstrated a significant improvement in fatigue life, the value of which increased in the low-cycle fatigue region by 328.6% for the joint with notches and by 640.8% for the joint with holes. A smaller yet still positive effect of the applied modifications was shown for high-cycle fatigue. For a variable load with the maximum value of 9 MPa, the fatigue life increased by 215.9% for the variant with notches and by 183.3% for the variant with holes. Surface topography of fatigue fractures was examined by determining roughness parameters on the overlap ends in the samples. Significant differences were shown, with the selected roughness parameters being significantly lower for the reference variant than for the variants with notches and holes. It was shown that the applied structural modifications led to increasing the fatigue strength to 8.5 MPa for the limit number of cycles equal to 2×106, when compared to the reference variant for which the fatigue strength was 8 MPa.
Free trade with the former COMECON Countries as Unequal Exchange
- Marta Kuc-Czarnecka
- Magdalena Olczyk
- Andrea Saltelli,
- Erik, S. Reinert
2023 Pełny tekst
Two authors of this chapter were born to the East of what was once The Iron Curtain and two to the West. From both angles, the two systems – capitalism and communism – seemed to be as contrary to each other as possible. Few people are aware that in terms of industrial and trade policy, both classical capitalism and communism had a common root in the theories of German economist Friedrich List (1789-1846) (List, 1841). In fact, for the 200th anniversary of his birth in 1989, both East Germany (DDR) and West Germany (Deutsche Bundespost) celebrated Friedrich List's anniversary with postage-stamps. The two enemies who had split Germany between them even chose the same portrait of their common hero! However, after the collapse of the Berlin Wall, the policy that was forced upon the former COMECON countries was not the old capitalism honoured by West Germany in 1989. Capitalist theory (but not practice) had given way to neoliberalism, a system that does not see any difference between economic activities. The theory that came out as a winner at the end of the Cold War was essentially David Ricardo's (1817) theory of international trade, restated by US economist Paul Samuelson (1948). Samuelson 'proved' that free trade, regardless of what was traded, would create a movement towards factor-price equalization (that the price of the factors of production, capital and labour) would tend to equalize across the globe. This neoliberal theory was immediately forced upon the former communist countries, leading to different degrees of deindustrialization.
Free volume in physical absorption of carbon dioxide in ionic liquids: Molecular dynamics supported modeling
- Joachim Eichenlaub
- Karol Baran
- Maciej Śmiechowski
- Adam Kloskowski
2023 SEPARATION AND PURIFICATION TECHNOLOGY
Understanding the mechanisms underlying the carbon dioxide (CO2) absorption in ionic liquids (ILs) is the key to their efficient utilization in industrial flue gas treatment. One of the parameters considered substantially important in the process is the Free Volume. In this study, the Fractional Free Volume (FFV) of 73 ILs was calculated using Molecular Dynamics (MD). A quantitative Structure-Property Relationship (QSPR) study was then employed to predict the FFV, but the validation parameters were unsatisfactory. In the second part, the importance of Free Volume in the absorption of CO2 in ILs was assessed by creating two models to predict Henry’s Law Constant of CO2 in ILs. It was found that the addition of the FFV parameter considerably improved the statistical parameters and predictability of the QSPR model. Furthermore, FFV was found to be heavily dependent on the cation type and its inclusion allowed for the determination of more subtle molecular interactions.
Frequency measurement research with weight averaging of pulse output signal of voltage-to-frequency converter
- Mykhaylo Dorozhovets
- Eligiusz Pawłowski
- Dariusz Świsulski
2023 MEASUREMENT
The paper presents the essence and investigation of the efficiency of weight averaging of a pulse output signal of voltage-to-frequency converter. The effect of counting and the influence of interference on the result of weight averaging of frequency modulated pulses are analyzed. It is shown that from the point of view of counting error reduction, the best are polynomial weight functions. In the case of high interferences whose frequencies are unstable or may change over a wide range, the specified level of their suppression, together with the reduction of the counting effect, can be achieved using weight functions, such as trigonometric. The interference suppression both in the narrow and wide frequency ranges, as well as the counting error when using selected weight functions, have been tested by both simulation and experimentally. The obtained results show very good convergence with the values calculated from theoretical formulas.
Frequency Selective Surface Based MIMO Antenna Array for 5G Millimeter-Wave Applications
- Iftikhar Din
- Mohammad Alibakhshikenari
- Bal S. Virdee
- Renu Karthick Rajaguru Jayanthi
- Sadiq Ullah
- Chan Hwang See
- Salahuddin Khan
- Sławomir Kozieł
- Sławomir Kozieł
2023 Pełny tekst SENSORS
Abstract: In this paper a radiating element consisting of a modified circular patch is proposed for MIMO arrays for 5G millimeter-wave applications. The radiating elements in the proposed 2×2 MIMO antenna array are orthogonally configured relative to each other to mitigate mutual coupling that would otherwise degrade the performance of the MIMO system. The MIMO array was fabri-cated on Rogers RT/Duroid high frequency substrate with dielectric constant of 2.2, thickness of 0.8 mm and loss tangent of 0.0009. The individual antenna in the array has a measured impedance bandwidth of 1.6 GHz from 27.25 to 28.85 GHz for S11 ≤ −10 dB, and the MIMO array has a gain of 7.2 dBi at 28 GHz with inter radiator isolation of greater than 26 dB. The gain of the MIMO array was increased by introducing frequency selective surface (FSS) consisting of 7×7 array of unit cells comprising rectangular C-shaped resonators one embedded inside the other with a central criss-cross slotted patch. With the FSS the gain of the MIMO array increased to 7.6 dBi at 28 GHz. The radiation from the array is directional and perpendicular to the plain of the MIMO array. Owing to the low coupling between the radiating elements in the MIMO array its Envelope Correlation Coefficient (ECC) is less than 0.002 and Diversity Gain (DG) is better than 9.99 dB in the 5G oper-ating band centered at 28 GHz between 26.5 GHz and 29.5 GHz.
Friction Stir Welding of Aluminum in the Aerospace Industry: The Current Progress and State-of-the-Art Review
- Mohamed M. Z. Ahmed
- Mohamed M. El-Sayed Seleman
- Dariusz Fydrych
- Gürel Çam
2023 Pełny tekst Materials
The use of the friction stir welding (FSW) process as a relatively new solid-state welding technology in the aerospace industry has pushed forward several developments in different related aspects of this strategic industry. In terms of the FSW process itself, due to the geometric limitations involved in the conventional FSW process, many variants have been required over time to suit the different types of geometries and structures, which has resulted in the development of numerous variants such as refill friction stir spot welding (RFSSW), stationary shoulder friction stir welding (SSFSW), and bobbin tool friction stir welding (BTFSW). In terms of FSW machines, significant development has occurred in the new design and adaptation of the existing machining equipment through the use of their structures or the new and specially designed FSW heads. In terms of the most used materials in the aerospace industry, there has been development of new high strength-to-weight ratios such as the 3rd generation aluminum–lithium alloys that have become successfully weldable by FSW with fewer welding defects and a significant improvement in the weld quality and geometric accuracy. The purpose of this article is to summarize the state of knowledge regarding the application of the FSW process to join materials used in the aerospace industry and to identify gaps in the state of the art. This work describes the fundamental techniques and tools necessary to make soundly welded joints. Typical applications of FSW processes are surveyed, including friction stir spot welding, RFSSW, SSFSW, BTFSW, and underwater FSW. Conclusions and suggestions for future development are proposed
From Scores to Predictions in Multi-Label Classification: Neural Thresholding Strategies
- Karol Draszawka
- Julian Szymański
2023 Pełny tekst Applied Sciences-Basel
In this paper, we propose a novel approach for obtaining predictions from per-class scores to improve the accuracy of multi-label classification systems. In a multi-label classification task, the expected output is a set of predicted labels per each testing sample. Typically, these predictions are calculated by implicit or explicit thresholding of per-class real-valued scores: classes with scores exceeding a given threshold value are added to a prediction set. In our work, we propose a neural network-based thresholding phase for multi-label classification systems and examine its influence on the overall classification performance measured by micro- and macro-averaged F1 scores on synthetic and real datasets. In contrast to classic thresholding methods, our approach has the unique property of being able to recover from scoring errors, because each decision about a given label prediction depends on the corresponding class score, as well as on all the other class scores for a given sample at once. The method can be used in combination with any classification system that outputs real-valued class scores. The proposed thresholding methods are trained offline, after the completion of the scoring phase. As such, it can be considered a universal fine-tuning step that can be employed in any multi-label classification system that seeks to find the best multi-label predictions based on class scores. In our experiments on real datasets, the input class scores were obtained from two third-party baseline classification systems. We show that our approach outperforms the traditional thresholding methods, which results in the improved performance of all tested multi-label classification tasks. In terms of relative improvement, on real datasets, the micro-F1 score is higher by up to 40.6%, the macro-F1 score is higher by up to 3.6%, and the averaged micro–macro-F1 score is higher by up to 30.1%, considering single models only. We show that ensembles and hybrid models give even better results. We show examples of successful extreme recoveries, where the system, equipped with our method, was able to correctly predict labels, which were highly underscored after the scoring phase.