Advances in mechanical and power engineering : selected papers from the International Conference on Advanced Mechanical and Power Engineering (CAMPE 2021), October 18-21, 2021

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Preface Organization Honorary Chairs General Chair Co-chair Steering Committee Program Committee Invited External Reviewers Contents Fluid Mechanics and Heat Transfer in Power Engineering Influence of Compressibility in Fluid - Structure Interaction Problems for Fluid-Filled Reservoirs 1 Introduction 2 Methodology 2.1 Basic Relations 2.2 Eigenvalue Problems for Shells Partially Filled with Compressible Liquid 3 Results and Discussion 3.1 Numerical Simulation of Liquid Vibrations in Rigid Shells 3.2 Numerical Simulation of Elastic Shell Vibrations Coupled with Liquid Sloshing 4 Conclusion and Future Research References Modeling of Aeroelastic Instability of Fan Blades 1 Introduction 2 Aeroelastic Problem Statement 3 Results and Discussion 4 Conclusion References Experimental Studies of Pump-Turbine Flow Part Models at Heads of 80–120 m 1 Introduction 2 Analysis of Literature Sources and Problem Statement 3 Description and Characteristics of the Hydrodynamic Test Stand 4 Results of Experimental Study 4.1 Turbine Mode 4.2 Pump Mode 5 Conclusion References Turboexpander Unit Use for Efficiency Increase of Gas Compressor Station 1 Introduction 2 Problem Statement 3 Research Aim and Tasks 4 Research Materials and Methods 5 Research Results 6 Conclusions References Thermodynamic Analysis and Optimization of the Cycle of a CHP Plant Power Unit Operating with Ultra-supercritical Steam Parameters 1 Introduction 2 Literature Analysis and Problem Statement 3 Thermodynamic and Exergetic Model of a CHPP Power Unit Operating with Ultra-supercritical Steam Parameters 4 Determination of the CHPP Power Unit Efficiency with Varying Temperature and Pressure of Superheated Steam 5 Optimization of the Cycle of the CHPP Power Unit 6 Results and Discussion 7 Conclusions References Advanced Computer Technologies in the New Flow Part Development for Reactive Type HPC Steam Turbine of T-100 Series 1 Introduction 2 Method for Gas Dynamic Calculation and Profiling of Axial Reactive-Type Flow Parts 3 Research Object 4 Results and Discussion 5 Conclusions References Energy Saving Technologies and Environmental Safety Using Pneumo-Hydrovortex Nozzles for Effective Combustion of Liquid Boiler Fuels 1 Introduction 2 Literature Reviews 3 Research Methodologies 4 Results and Discussion 5 Results and Discussion 6 Conclusions References Integrated Energy Technologies When Using Natural Gas in Utility Heat Power Engineering 1 Introduction 2 Methodology 3 Results and Discussion 4 Conclusions References The System for Planning Cost-Efficient and Resource-Saving Operating Modes of TPP 1 Introduction 2 Rationalization of Operating Modes of TPP Power Units to Reduce Energy Losses During Operation 2.1 Loss of Fuel, Heat and Electricity During the Start-Up of TPP Power Unit 2.2 Development of a System for Planning Rational Modes of Operation of TPP Power Units Aimed at Minimizing Fuel Consumption 3 Ensuring the Long-Term Operation of TPP Units by Rationalization Operating Modes 4 Discussion of Research Results 5 Conclusions References Assessment of Quality Criteria of Shot Blasting Cleaning of the Inner Surfaces of Chemically Resistant Containers 1 Introduction 2 Methodology 3 Results 3.1 Time Interval 3.2 Roughness Parameters 3.3 Charging of the Treated Surface 4 Conclusions References Numerical Simulations of Mixture Formation to Ensuring the Quality of Thermal Deburring 1 Introduction 2 Mixture Formation Problem Formulation for TEM 3 Numerical Simulation Results 4 Conclusions References Structure and Wear-Resistance of Hardened Thin-Blade Knives with PVD Coating 1 Introduction 2 Methodology 3 Results 4 Conclusion References Modeling of Degradation Processes of Cast Iron Carbide Phase of Mill Rolls at Operation 1 Introduction 2 Methodology 3 Results 4 Conclusion References Application of Artificial Neural Network (ANN) for Calculations of Pressure–Concentration–Temperature (PCT) Diagrams in Hydrogen – Metal Hydride Systems 1 Introduction 2 Methodology 2.1 General Algorithm 2.2 Building Neural Networks 2.3 Data Sources 2.4 ANN Development 3 Results 3.1 ANN Training, Validation and Test 4 Conclusions References Thermal Stability, Cyclic Durability and Hydrogen Resistance of Cast Nickel-Cobalt Alloys for Gas Turbine Blades 1 Introduction 2 Materials and Testing Method 3 Results and Discussion 3.1 Thermal Stability, High-Cycle Fatigue and Long-Term Strength of Alloys in Air 3.2 Influence of Hydrogen on the Strength, Plasticity and Low-Cycle Durability of Alloys 4 Conclusion References Dynamics and Strength of Power Equipment Study of Reduction of Strength of Composite Plates with Delamination 1 Introduction 2 Literature Review 3 Research Methodology 4 Results and Discussion 5 Conclusions References Comparative Analysis of Numerical Methods for Solving Linear Equation Systems for Poisson’s Equation 1 Introduction 2 Iterative Methods for Solving Systems of Linear Algebraic Equations 2.1 Stationary Methods 2.2 Nonstationary Methods 3 Comparative Assessment of Iterative Methods for Solving Systems of Linear Algebraic Equations 4 Problem Statement 5 Results and Discussion 6 Conclusions References Exact Analytical Solution of the Pure Bending Problem of a Multilayer Wedge-Shaped Console 1 Introduction 2 Methodology 3 Results 4 Conclusion References Application of the R-functions Method and Shell Theory of the Higher-Order to Study Free Vibration of Functionally Graded Shallow Shells 1 Introduction 2 Mathematical Formulation of the Vibration Problems for Functionally Graded Plates and Shallow Shells in Framework of HSDT 3 Solution Method 4 Numerical Results 4.1 Test Problem. Shells with Rectangular Shape of Plan 4.2 Shells with a Complex Planform 5 Conclusion References Spot Welded Joints of Steels Produced by Electric Arc and Laser Welding in Different Spatial Positions 1 Introduction 2 Methodology 3 Results 4 Conclusions References Determination of Composite’s Bearing Strength in the Area of Circular Hole of Fastening Element 1 Introduction 2 Literature Review 3 Research Methodology 4 Results and Discussion 5 Conclusions References Elastoplastic Thermo-mechanical Stressed State of Turbine Blades Locking Joints 1 Introduction 2 Methodology 3 Results of Numerical Simulations 4 Conclusions References Weighted Eigenvalue Counts on Intervals for Spectrum Optimization 1 Introduction 2 Literature Review 3 Research Methodology 3.1 Problem Statement 3.2 Heuristic Objective Function and Optimization Strategy 4 Results and Discussion 4.1 Numerical Example 4.2 Discussion 5 Conclusion and Future Work References Multi-scale Finite-Element Model for Numerical Prediction of Subcritical Damage and Limit State of Fiber-Reinforced Composites and Structures 1 Introduction 2 Finite-Element Procedure for Prediction of Subcritical and Limit State of Fiber-Reinforced Composite Materials 2.1 Main Assumptions and Physical Model 2.2 Mathematical Description of Stress-Strain and Damage States of Spatially Nonhomogenious Material 2.3 Validation of the Developed Models and Means of Their Program Implementation 3 Results and Discussion 4 Conclusions References Relaxation of the Technological Residual Stresses During the Thermal Exposure in Titanium Samples 1 Introduction 2 Literature Review 3 Research Methodology 4 Results and Discussion 5 Conclusions References Irregular Packing for Additive Manufacturing 1 Introduction 2 Problem Definition 3 Mathematical Modeling 4 Solution Approach 5 Construction of Starting Points 5.1 Packing Bodies Pairwise into Rectangular Parallelepipeds and Spheres 6 Numerical Results 7 Conclusions References Porosity Measurement in Carbon-Fiber-Reinforced Polymer Composite Through Optical Microscopy Using ImageJ Software 1 Introduction 2 Experimental Procedure 2.1 Materials and Processing 2.2 Image Processing Procedure 3 Results and Discussion 3.1 Image Processing 3.2 Automated Image Processing Procedure 4 Conclusions References Special Functions in Heat Transfer Problems 1 Introduction 2 Methodology 3 Results 4 Conclusion References Coupled Finite and Boundary Element Methods in Fluid-Structure Interaction Problems for Power Machine Units 1 Introduction 2 Literature Review 3 Problem Statement 3.1 Main Relations of Elastic Body Motion 3.2 Main Relations of Liquid Motion 3.3 Pressure on the Surfaces of Structural Elements in Bilateral Contact with Liquid 4 Numerical Simulation 4.1 Finite Element Method in Problems of Free Vibrations 4.2 Numerical Solution of the Hypersingular Equation 4.3 Free Vibrations of the Round Plate with Liquid Added Masses 4.4 Free Vibrations of the Kaplan Turbine Blade Models 5 Conclusions References Mathematical Model of Additive Mixing During RH Process Using Elliptic Cylindrical Coordinates 1 Introduction 2 Literature Review 3 Methodology 3.1 Assumptions 3.2 Equations 4 Results and Discussion 5 Conclusions References A Study of the Dynamic Response of Materials and Multilayer Structures to Shock Loads 1 Introduction 2 Response of Multilayer Plates to Low-Velocity Impact 2.1 Problem Statement 2.2 Mathematical Models. Governing Equation 2.3 Numerical and Experimental Results 3 Investigating Material Properties at High-Rate Deformation 4 Conclusions References Rotation of the Layer with the Cylindrical Pipe Around the Rigid Cylinder 1 Introduction 2 Problem Statement 3 Problem Solution 4 Numerical Studies of the Stress State 5 Summary References Reduction of Dynamic Stresses and Overloads Using Dampers in the Rocket Fairing Separation System 1 Introduction 2 Simulation. Accounting for Damper Nonlinearity 3 Reducing Vibration Stress During Shock Contact 4 Reducing the Vibrational Overloads 5 Conclusions References Numerical Modeling of Dynamic Processes of Elastic-Plastic Deformation of Axisymmetric Structures 1 Introduction 2 The Main Relationships of the Analysis of Transient Processes in Axisymmetric Structures with Plastic Deformations Taken into Account 3 Modeling Dynamic Processes of Elastic-Plastic Deformation of Axially Symmetric FEM Structures 4 Conclusions References Cross-Line Method for Solving Heat Conduction Problems 1 Introduction 2 Methodology 2.1 Cross Lines and Their Spatial Partial Derivatives Used in Cross-Line Method 2.2 Cross-Line Method for Solving Heat Conduction Problems 3 Results and Discussion 3.1 Heat Conduction Over a Plate 3.2 Heat Conduction over a Heat Radiator 4 Conclusions References Vibration Analysis of Curved Panels and Shell Using Approximate Methods and Determination of Optimum Periodic Angle 1 Introduction 2 Methodology 2.1 Free Vibration of Cylindrical shell WARBURTON’S [12] and Curved Panel 2.2 Free Vibration of Curved Panel in Dimensionless Co-ordinates 3 Finite Element Formulation for Free Vibration Analysis 3.1 Present Finite Element(FE) for Curved Panel 3.2 Equation of Motion 4 Results and Discussions 4.1 Free Vibration of Full Circular Cylindrical Shell, Single Curved Panel and Determination of Optimum Periodic Angle and Repeating Cells 4.2 Single Curved Panel Finite Element 5 Conclusion References Fast Fracture of Conic Shell Under the Action of Belt Explosive Charge 1 Introduction 2 Numerical Simulation of Stress-Strain State Localization in Conic Shell 3 Stress-Strain State of Conic Shell Under the Action of Impact Pressure 4 Flow Rule and Damage Equation 5 Solution of Damage-Fracture Plane Stress Problem 6 Numerical Simulation of Damage and Fracture in Rectangular Area. Results and Discussion 7 Conclusions References Author Index This book covers theoretical and experimental findings at the interface between fluid mechanics, heat transfer and energy technologies. It reports on the development and improvement of numerical methods and intelligent technologies for a wide range of applications in mechanical, power and materials engineering. It reports on solutions to modern fluid mechanics and heat transfer problems, on strategies for studying and improving the dynamics and durability of power equipment, discussing important issues relating to energy saving and environmental safety. Gathering selected contributions to the XIV International Conference on Advanced Mechanical and Power Engineering (CAMPE 2021), held online on October 18-21, 2021, from Kharkiv, Ukraine, this book offers a timely update and extensive information for both researchers and professionals in the field of mechanical and power engineering.