Dynamics and fault diagnosis on nonlinear rotors and impellers / / Jiazhong Zhang

• Record Nr.: UNINA9910568252303321
• Autore: Zhang Jiazhong
• Pubbl/distr/stampa: Cham, Switzerland : , : Springer International Publishing, , [2022]; ©2022
• ISBN: 9783030943011; 9783030943004
• Descrizione fisica: 1 online resource (281 pages)
• Collana: Nonlinear Systems and Complexity ; ; v.34
• Disciplina: 620.0044
• Soggetti: Fault location (Engineering); Fault location (Engineering) - Automation
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di contenuto: Intro -- Preface -- Contents -- 1 Periodic Motions to Chaos in a Nonlinear Rotor System -- 1.1 Introduction -- 1.2 Methodology -- 1.3 Bifurcation Trees -- 1.4 Numerical Simulation -- 1.5 Conclusions -- A.1 Appendix -- References -- 2 Fault Diagnosis of Gear Rotor System Based on Collaborative Filtering Recommendation Method -- 2.1 Introduction -- 2.2 Adaptive Oversampling Technology and Multi-scale Entropy Analysis Method -- 2.2.1 Adaptive Oversampling Technology -- 2.2.2 Multi-scale Permutation Entropy -- 2.2.3 Wavelet Packet Energy Entropy -- 2.3 Construction Method of Feature-State Joint Scoring Matrix of Gear Failure -- 2.4 Recommended Diagnosis Method for Gear Fault Collaborative Filtering -- 2.5 Collaborative Filtering Recommended Gear Fault Diagnosis Model Fused with Multi-scale and Multi-domain Entropy -- 2.6 Experiment and Analysis of Gear Fault Diagnosis Cases -- 2.6.1 Gear Fault Diagnosis Experiment -- 2.6.2 Algorithm Verification and Analysis -- 2.6.3 Discussion of Algorithm Effect -- 2.7 Conclusion -- A.1 Appendix 1 -- B.1 Appendix 2 -- References -- 3 Study on Dynamic Behaviors of Rotor Model with Coupling Faults and Applications of TPOD Method -- 3.1 Introduction -- 3.2 Rotor Model with the Coupling Faults -- 3.3 Discussions on Dynamical Behaviors -- 3.3.1 Dynamical Behaviors -- 3.3.2 Effects of Systematic Parameters -- 3.3.2.1 Cracked Depth -- 3.3.2.2 Clearances ; Between Rotor and Stator -- 3.3.2.3 Stator Stiffness -- 3.3.2.4 Eccentricity -- 3.4 Optimal Reduced Model Based on POM Energy -- 3.5 Efficiency of the Order Reduction Method -- 3.6 Conclusions -- A.1 Appendix 1 -- B.1 Appendix 2 -- References -- 4 Nonlinear and Linear Phenomenon Investigation of Coupled Vibration of a Multi-disc Rotor Based on Multi-mistuned Blades Length or Multi-disordered Staggle Angle Blades -- 4.1 Introduction -- 4.2 Theoretical Analysis.; 4.3 Finite Element Methods -- 4.4 Numerical Results -- 4.5 Conclusions -- A.1 Appendix: Matrices Elements -- References -- 5 Lateral-Torsional-Coupled Model Based Dynamic Analyses of Spur Gears Under Time-Varying External Load Conditions with Surface Wear -- 5.1 Introduction -- 5.2 Dynamical Model -- 5.3 Numerical Simulation and Discussion -- 5.3.1 Effects of Wear on Meshing Stiffness and STE -- 5.3.2 Effects of Time-Varying External Loads and Surface Wear -- 5.3.2.1 Dynamic Characteristics of System Operates at n1 == 800 rpm -- 5.3.2.2 Dynamic Characteristics of System Operates at n1 == 1860 rpm -- 5.3.2.3 Dynamic Characteristics of System Operates at n1 == 3720 rpm -- 5.3.2.4 Comparisons of Dynamic Factor and Dominated Amplitudes -- 5.3.3 Parametric Analysis -- 5.3.3.1 Effects of Surface Wear Depth -- 5.3.3.2 Coupling Effects of Time-Varying Load and Gear Wear -- 5.4 Conclusions -- Appendix -- References -- 6 Experimental and Numerical Studies on Compressor Nonlinear Behaviors with Inlet Distortion and Their Interaction -- 6.1 Introduction -- 6.1.1 Experimental Investigations -- 6.1.2 Numerical Investigations Using CFD (Computational Fluid Dynamics) -- 6.2 Experimental and Simulation Setups -- 6.2.1 Experimental Setups -- 6.2.2 Numerical Simulation -- 6.3 Results -- 6.3.1 Steady Part of Flat Baffle Distortion -- 6.3.2 Rotor Steady-State Performance with Distortion -- 6.3.3 Unsteady Part of Flat Baffle Distortion -- 6.3.4 Rotor Performances with Distortion -- 6.4 Conclusions and Outlook -- References -- 7 Study on Mode Localization Induced by Material and Aerodynamic Mistunings in Impellers with Periodical and Cyclic Symmetry -- 7.1 Introduction -- 7.1.1 Background -- 7.1.2 State of the Art -- 7.2 Fundamental Theories of Vibration Localizations of Periodic Structures -- 7.2.1 Concept of Vibration Localization and Its Developments.; 7.2.2 Nature of Vibration Localization and Its Effects -- 7.2.3 Main Models of Vibration Localization -- 7.2.4 Main Analysis Methods -- 7.3 Finite Element Method Combined with Materials Mistuning -- 7.3.1 Finite Element Method to Model Material Mistuning -- 7.3.2 Mistuning from Aerodynamics -- 7.3.2.1 Stress Stiffening Effects -- 7.3.2.2 Aerodynamics Effects -- 7.4 Influences of Material Mistuning on Mode Localization -- 7.4.1 Model of Material Mistuning of Impeller -- 7.4.1.1 Meshing and 3D Model -- 7.4.1.2 Stochastic Distribution of Material Mistuning -- 7.4.1.3 Probability Statistical Distribution of Material Properties -- 7.4.2 Numerical Examples -- 7.4.2.1 Mode Analysis of Tuned Impeller -- 7.4.3 Mode Analysis of Mistuned Impeller -- 7.5 Aerodynamic Mistuning and Vibration Localization -- 7.5.1 Analysis of Centrifugal Impeller with Aerodynamic Mistuning -- 7.5.1.1 Numerical Simulation of the Flow Field -- 7.5.1.2 Modal Analysis -- 7.5.2 Relationship Between Degree of Localization and Average Aerodynamic Mistuning -- 7.6 Conclusion -- References -- 8 Fluid-Structure Interactions of a Perimeter-Reinforced Membrane Wing in Laminar Shear Flow -- 8.1 Introduction -- 8.2 Mechanical Model and Mathematical Formulation -- 8.3 Numerical Method -- 8.3.1 Flow Solver -- 8.3.2 Structure Solver -- 8.3.3 FSI Solution Procedure -- 8.4 Numerical Results -- 8.4.1 Computational Model and Code Verification -- 8.4.2 Membrane Wing in Shear Flow -- 8.4.2.1 Aerodynamic ; Performance -- 8.4.2.2 Structure Response -- 8.4.2.3 Flow Field -- 8.5 Conclusions -- References -- 9 Periodic Motions and Bifurcations in a Double Pendulum -- 9.1 Introduction -- 9.2 Mechanical Model -- 9.3 Periodic Motions and Stability -- 9.4 Period-1 to Period-4 Motions -- 9.5 Period-3 Motion -- 9.6 Conclusion -- Appendix -- References.; 10 Analytical Periodic Motions for a First-Order Nonlinear Circuit System Under Different Excitations -- 10.1 Introduction -- 10.2 First-Order Nonlinear Circuit Simulation Model -- 10.3 Analytical Solution of the First-Order Nonlinear Circuit -- 10.4 Characteristics of Numerical Model and Circuit Simulation Model -- 10.5 Output Response of the First-Order Nonlinear Circuit -- 10.6 Conclusions -- References -- 11 Model Reduction on Approximate Inertial Manifolds for NS Equations through Multilevel Finite Element Method and Hierarchical Basis -- 11.1 Introduction -- 11.2 Mathematical Modelling -- 11.2.1 Governing Equations -- 11.2.2 The Boundary Conditions -- 11.2.3 Existence of Inertial Manifolds -- 11.2.4 Multilevel Finite Element Method and Its Basis -- 11.3 Numerical Scheme for Navier-Stokes Equations -- 11.4 Weak Form of Navier-Stokes Equation -- 11.4.1 Verification of Numerical Method -- 11.5 Numerical Results and Discussion -- 11.5.1 Pressure Distribution Contours of NACA 0012 Airfoil -- 11.5.2 Distributions of Pressure Coefficients of NACA 0012 Airfoil -- 11.5.3 Comparisons of Computational Time -- 11.6 Conclusion -- References -- Index.