Structural Dynamics of Turbo-machines

Description

* Text developed to meet the needs of engineering students in industries where turbo-machines are used. * Close correlation between the design and dynamics disciplines maintained throughout the text. * Example problems given at the end of each chapter. Cover Preface Contents Part I Component Dynamics, Life Cycle Evaluation Chapter 1 Vibration Theory Fundamentals 1.1 Introduction 1.2 Vector Method of Representing Dynamic Motion 1.3 Complex Numbers Method 1.4 Free Vibrations Without Damping 1.5 Torsional Pendulum 1.6 Free Vibrations With Viscous Damping 1.7 Forced Vibrations Without Damping 1.8 Forced Vibrations With Viscous Damping 1.9 Vibration Due to Rotating Eccentric Weight 1.10 Vibration Isolation 1.11 Cantilever Beam Attached to Wheel 1.12 Beam Subjected to Centrifugal Force 1.13 Flexibly Mounted Beam 1.14 Row of Connected Beams 1.15 Energy Methods in Shell Vibration 1.16 Vibration in Circular Disk 1.17 Coupled Disk-Blade System 1.18 Example Problems References & Bibliography Chapter 2 Fan and Compressor Airfoils 2.1 Introduction 2.2 Finite Element Method in Blade Vibrations 2.3 Individual Blade Vibration 2.4 Blade Flutter 2.5 Cascade Flutter Analysis 2.6 Prediction of Forced Response 2.7 Aspects of Bladed Disk Assembly Dynamics 2.8 Propeller Blade Separation Incident 2.9 Acoustic Resonance in Multi-Stage Compressor 2.10 Whirl Inducing Forces in Axial Compressor 2.11 Example Problems Refrences & Bibliography Chapter 3 Turbine and Combustor Parts 3.1 Introduction 3.2 Integrity Evaluation of Turbine Blade 3.3 Response Due to Blade-Vane Interaction 3.4 Periodic Response of Shrouded Blades 3.5 Cyclically Symmetric Structures 3.6 Random Blade Mistuning 3.7 Cumulative Damage Theory in Life Prediction 3.8 Acoustic Resonance in Combustor 3.9 Active Combustion Instability Control 3.10 Structural Design of Combustor Liner For Dynamic Pressure 3.11 Example Problems References & Bibliography Chapter 4 Bearing and Seal Characteristics 4.1 Introduction 4.2 Fluid Film Bearing 4.3 Journal Bearing Types 4.4 Dynamic Characteristics 4.5 Rolling Element Bearing 4.6 Tip Clearance Actuation With Magnetic Bearings 4.7 Impact of Flexible Support 4.8 Labyrinth and Honeycomb Seal Evaluation 4.9 Damping Seal Dynamic Characteristics 4.10 Squeeze Film Damper 4.11 Example Problems References & Bibliography Part II Structural and Operational Analysis of Engine System Chapter 5 Shaft Torsional Vibration 5.1 Introduction 5.2 Simple Two-Inertia System 5.3 Energy Balance Method 5.4 Matrix Method 5.5 Finite Element Method 5.6 Geared and Branched Systems 5.7 Critical Speeds and Modes 5.8 Resonant Response 5.9 Dynamic Vibration Absorbers 5.10 Torsional Dampers 5.11 Permissible Amplitudes 5.12 Shifting of Critical Speeds 5.13 Example Problems References & Biliography Chapter 6 Flexural Rotor Dynamics 6.1 Introduction 6.2 Dynamics of shaft Motion 6.3 Support Flexibility and Critical Speeds 6.4 Procedure for Critical Speeds 6.5 Critical Speed Positioning 6.6 Synchronous Response 6.7 Component Mode Synthesis of Large Systems 6.8 Rotor supported in Flexible Casing 6.9 Dry friction Rubbing Between Rotor and Seal 6.10 Stability Considerations 6.11 Self-Excited Vibrations 6.12 Periodic System Characteristics 6.13 Methods to Alleviate Vibration Instability 6.14 Rotor Dynamic Design of High Pressure Compressor 6.15 Effect of Squeeze Film Damper on Rotor Response and Stability 6.16 Full Load Testing for Rotor Dynamics Improvement 6.17 LM 2500 Engine Vibration Characteristics 6.18 Prerventing Sub-Synchronous Vibrations in Large Steam Turbines 6.19 Example Problems References & Bibliography Part III Engine Operational Characteristics Chapter 7 Experimental and Test Measurement 7.1 Introduction 7.2 Vibration Sensors 7.3 Measurement Techniques 7.4 Signal Processing 7.5 Modal Analysis 7.6 Analyzing Transient Machinery Vibrations 7.7 Positioning Strain Gauges on Blades 7.8 Blade Vibration Measurement 7.9 High Temperature Proximity Measurement 7.10 Blade Tip Timing Methods 7.11 Testing Under Transient Conditions 7.12 Mode Localization and Forced Response in Bladed Disk 7.13 Lubricant Analysis 7.14 Bearing Element Defect Detection 7.15 Detection of Crack in Rotor 7.16 Radiation Thermometry Method 7.17 Life Prediction from Post-Service Oxidation 7.18 Leakage in Stepped Labyrinth 7.19 Compressor Surge Investigation Using Digital Velocimetry 7.20 Flow in Engine Exhaust System References & Biblography Chapter 8 Balancing of Rotors 8.1 Introduction 8.2 Assembly and Operational Procedures and Rotor Vibrations 8.3 Balance Methods 8.4 Motion of Unbalanced Rotors 8.5 Correction Methods 8.6 Balancing of Rigid Rotor 8.7 Single Plane Balancing of Flexible Rotor 8.8 Overhung Thin Disk Rotor 8.9 Multi-Plane Balancing of Flexible Rotors 8.10 Balancing Machines 8.11 Balance Criteria 8.12 Example Problems References & Bibliography Chapter 9 Turbo-Machinery Noise 9.1 Introduction 9.2 Operating Parameters 9.3 Jet Engine Noise 9.4 Unsteady flow Aspects and Noise 9.5 Rotating and Stationary Blade Interaction and Noise 9.6 Noise Generation in Industrial Turbines 9.7 Inlet and Exhaust Systems 9.8 Shaft Vibration and Noise 9.9 Correlation Between Dynamics and Noise 9.10 Procedures for Noise Evaluation 9.11 Static Tests 9.12 Monitoring for Quality Control 9.13 Suppression of Jet Noise 9.14 Damping Techniques 9.15 Tuned Dampers 9.16 Example Problems References & Bibliography Index