Clarence W. de Silva

Bio: Clarence W. de Silva is an academic researcher from University of British Columbia. The author has contributed to research in topics: Robot & Mobile robot. The author has an hindex of 28, co-authored 234 publications receiving 3728 citations. Previous affiliations of Clarence W. de Silva include University of Toronto & Harvard University.

Vibration: Fundamentals and Practice

Abstract: VIBRATION ENGINEERING Introduction Study of Vibration Application Areas History of Vibration Organization of the Book Problems TIME RESPONSE Introduction Undamped Oscillator Heavy Springs Oscillations in Fluid Systems Damped Simple Oscillator Forced Response Problems FREQUENCY RESPONSE Introduction Response to Harmonic Excitations Transform Techniques Mechanical Impedance Approach Transmissibility Functions Receptance Method Problems VIBRATION SIGNAL ANALYSIS Introduction Frequency Spectrum Signal Types Fourier Analysis Random Vibration Analysis Other Topics of Signal Analysis Order Analysis Machine Monitoring and Fault Diagnosis Problems MODAL ANALYSIS Introduction Degrees of Freedom and Independent Coordinates System Representation Modal Vibrations Orthogonality of Natural Modes Static Modes and Rigid Body Modes Other Modal Formulations Forced Vibration Damped Systems State-Space Approach Problems DISTRIBUTED-PARAMETER SYSTEMS Introduction Transverse Vibration of Cables Longitudinal Vibrations of Rods Torsional Vibration of Shafts Flexural Vibration of Beams Damped Continuous Systems Vibration of Membranes and Plates Problems VIBRATION DAMPING Introduction Types of Damping Representation of Damping in Vibration Analysis Measurement of Damping Interface Damping Problems VIBRATION INSTRUMENTATION Introduction Vibration Exciters Control System Performance Specification Motion Sensors and Transducers Torque, Force, and Other Sensors Problems SIGNAL CONDITIONING AND MODIFICATION Introduction Amplifiers Analog Filters Modulators and Demodulators Analog-Digital Conversion Bridge Circuits Linearizing Devices Miscellaneous Signal Modification Circuitry Signal Analyzers and Display Devices Problems VIBRATION TESTING AND HUMAN RESPONSE Introduction Representation of a Vibration Environment Pre-Test Procedures Testing Procedures Some Practical Information Vibration Excitations on Humans Human Response to Vibration Regulation of Human Vibration Problems EXPERIMENTAL MODAL ANALYSIS Introduction Frequency Domain Formulation Experimental Model Development Curve Fitting of Transfer Functions Laboratory Experiments Commercial EMA Systems Problems VIBRATION DESIGN AND CONTROL Introduction Specification of Vibration Limits Vibration Isolation Balancing of Rotating Machinery Balancing of Reciprocating Machines Whirling of Shafts Design through Modal Testing Passive Control of Vibration Active Control of Vibration Control of Beam Vibrations Problems APPENDIX A: DYNAMIC MODELS AND ANALOGIES Model Development Analogies Mechanical Elements Electrical Elements Thermal Elements Fluid Elements State-Space Models Response Analysis and Simulation APPENDIX B: NEWTONIAN AND LAGRANGIAN MECHANICS Vector Kinematics Newtonian (Vector) Mechanics Lagrangian Mechanics APPENDIX C: REVIEW OF LINEAR ALGEBRA Vectors and Matrices Vector-Matrix Algebra Matrix Inverse Vector Spaces Determinants System of Linear Equations Quadratic Forms Matrix Eigenvalue Problem Matrix Transformations Matrix Exponential APPENDIX D: LAPLACE TRANSFORM Introduction Laplace Transform Response Analysis Transfer Function APPENDIX E: DIGITAL FOURIER ANALYSIS AND FFT Unification of the Three Fourier Transform Types Fast Fourier Transform (FFT) Discrete Correlation and Convolution Digital Fourier Analysis Procedures APPENDIX F: SOFTWARE TOOLS SIMULINK MATLAB Control Systems Toolbox LabVIEW APPENDIX G: RELIABILITY CONSIDERATIONS FOR MULTI-COMPONENT UNITS Failure Analysis Bayes' Theorem INDEX

Fault Diagnosis for Rotating Machinery Using Multiple Sensors and Convolutional Neural Networks

Abstract: This paper presents a convolutional neural network (CNN) based approach for fault diagnosis of rotating machinery. The proposed approach incorporates sensor fusion by taking advantage of the CNN structure to achieve higher and more robust diagnosis accuracy. Both temporal and spatial information of the raw data from multiple sensors is considered during the training process of the CNN. Representative features can be extracted automatically from the raw signals. It avoids manual feature extraction or selection, which relies heavily on prior knowledge of specific machinery and fault types. The effectiveness of the developed method is evaluated by using datasets from two types of typical rotating machinery, roller bearings, and gearboxes. Compared with traditional approaches using manual feature extraction, the results show the superior diagnosis performance of the proposed method. The present approach can be extended to fault diagnosis of other machinery with various types of sensors due to its end to end feature learning capability.

Intelligent Control: Fuzzy Logic Applications

Abstract: CONVENTIONAL AND INTELLIGENT CONTROL Introduction Conventional Control Techniques Summary Problems References KNOWLEDGE REPRESENTATION AND PROCESSING Introduction Knowledge and Intelligence Logic Semantic Networks Frames Production Systems Summary Problems References FUNDAMENTALS OF FUZZY LOGIC Introduction Fuzzy Sets Fuzzy Logic Operations Some Definitions Fuzzy Relations Composition and Inference Membership Function Estimation Summary Problems References FUZZY LOGIC CONTROL Introduction Basics of Fuzzy Control Decision Making with Crisp Measurements Defuzzification Architectures of Fuzzy Control Summary Problems References KNOWLEDGE-BASED TUNING Introduction Theoretical Background Analytical Framework Computational Efficiency Dynamic Switching of Fuzzy Resolution Illustrative Example Summary Problems References KNOWLEDGE-BASED CONTROL OF ROBOTS Introduction Robotic Control System Application to Robots In-Loop Direct Control High-Level Fuzzy Control Control Hierarchy System Development Servo Expert Development Summary Problems References SERVO MOTOR TUNING Introduction System Development Results Theory of Rule Base Decoupling Experimental Illustration Summary Problems References HIERARCHICAL FUZZY CONTROL Introduction General Concepts Hierarchical Model Effect of Information Processing Application in Process Control Summary Problems References INTELLIGENT RESTRUCTURING OF PRODUCTION SYSTEMS Introduction Theoretical Framework Implementation Using a Blackboard Architecture Case Study Summary Problems References FUTURE APPLICATIONS Introduction Intelligence in Automation Intelligent Multiagent Control Reconfigurable Autonomous Manipulators Intelligent Fusion of Sensors and Actuators Mechatronics Era Conclusion Problems References APPENDIX A: Further Topics on Fuzzy Logic APPENDIX B: Software Tools for Fuzzy Logic Applications Index

Vibration and Shock Handbook

Abstract: Preface Fundamentals and Analysis Time-Domain Analysis CW de Silva Frequency-Domain Analysis CW de Silva Modal Analysis CW de Silva Distributed-Parameter Systems CW de Silva Random Vibration H Benaroya Computer Techniques Numerical Techniques MD Dahleh Vibration Modeling and Software Tools D Song, C Huang, and Z-S Liu Computer Analysis of Flexibly Supported Multibody Systems I Esat and M Dabestani Finite Element Applications in Dynamics MS Gadala Vibration Signal Analysis CW de Silva Wavelets-Concepts and Applications PD Spanos Shock and Vibration Mechanical Shock C Lalanne Vibration and Shock Problems of Civil Engineering Structures P Mendis and T Ngo Reinforced Concrete Structures YL Mo Instrumentation and Testing Vibration Instrumentation CW de Silva Virtual Instrumentation M Sedlak and C DeFilippo Signal Conditioning and Modification CW de Silva Vibration Testing CW de Silva Experimental Modal Analysis CW de Silva Vibration Suppression and Control Vibration Damping CW de Silva Damping Theory RD Peters Experimental Techniques in Damping RD Peters Structure and Equipment Isolation YB Lang, LY Lu, and JD Yau Vibration Control N Jalili and E Esmailzadeh Helicopter Rotor Tuning K Danai Monitoring and Diagnosis Machine Condition Monitoring and Fault Diagnostics CK Mechefske Vibration-Based Tool Conditioning Monitoring Systems C Scheffer and PS Heyns Fault Diagnosis of Helicopter Gearboxes K Danai Vibration Suppression and Monitoring in Precision Motion Systems KK Tan, TH Lee, KZ Tang, S Huang, SY Lim, W Lin, and YP Leow Seismic Vibration Seismic Base Isolation and Vibration Control H Iemura, SK Jain, and MH Pradono Seismic Random Vibration of Long-Span Structures J Lin and Y Zhang Seismic Qualification of Equipment CW de Silva Design and Applications Vibration Design and Control CW de Silva Structural Dynamic Modification and Sensitivity Analysis SH Chen Vibration in Rotating Machinery HS Samarasekera Regenerative Chatter in Machine Tools RG Landers Fluid-Induced Vibration SM Han Acoustics Sound Levels and Decibels S Akashita Hearing and Psychological Effects S Akashita Noise Control Criteria and Regulations S Akashita Instrumentation K Nagakura Source of Noise S Akashita Design of Absorption T Obata Design of Reactive Mufflers T Obata Design of Sound Insulation K Okura Statistical Energy Analysis T Koizumi Glossary Index

Vibration damping, control, and design

Abstract: VIBRATION DAMPING Vibration Damping Clarence W. de Silva Introduction Types of Damping Representation of Damping in Vibration Analysis Measurement of Damping Interface Damping DAMPING THEORY Randall D. Peters Preface Introduction Background Hysteresis - More Details Damping Models Measurements of Damping Hysteretic Damping Failure of the Common Theory Air Influence Noise and Damping Transform Methods Hysteretic Damping Internal Friction Mathematical Tricks - Linear Damping Approximations Internal Friction Physics Zener Model Toward a Universal Model of Damping Nonlinearity Concluding Remark EXPERIMENTAL TECHNIQUES IN DAMPING Randall D. Peters Electronic Considerations Data Processing Sensor Choices Damping Examples Driven Oscillators with Damping Oscillator with Multiple Nonlinearities Multiple Modes of Vibration Internal Friction as Source of Mechanical Noise Viscous Damping - Need for Caution Air Influence STRUCTURE AND EQUIPMENT ISOLATION Y.B. Yang, L.Y. Lu, and J.D. Yau Introduction Mechanisms of Base-Isolated Systems Structure-Equipment Systems with Elastomeric Bearings Sliding Isolation Systems Sliding Isolation Systems with Resilient Mechanism Issues Related to Seismic Isolation Design VIBRATION CONTROL Nader Jalili and Ebrahim Esmailzadeh Introduction Vibration-Control Systems Concept Vibration-Control Systems Design and Implementation Practical Considerations and Related Topics HELICOPTER ROTOR TUNING Kourosh Danai Introduction Neural Network-Based Tuning Probability-Based Tuning Adaptive Tuning Case Study Conclusion VIBRATION DESIGN AND CONTROL Clarence W. de Silva Introduction Specification of Vibration Limits Vibration Isolation Balancing of Rotating Machinery Balancing of Reciprocating Machines Whirling of Shafts Design through Modal Testing Passive Control of Vibration Active Control of Vibration Control of Beam Vibrations Appendix 7A: MATLAB Control Systems Toolbox STRUCTURAL DYNAMIC MODIFICATION AND SENSITIVITY ANALYSIS Su Huan Chen Introduction Structural Dynamic Modification of Finite Element Model Perturbation Method of Vibration Modes Design Sensitivity Analysis of Structural Vibration Modes High-Accuracy Modal Superposition for Sensitivity Analysis of Modes Sensitivity of Eigenvectors for Free-Free Structures Matrix Perturbation Theory for Repeated Modes Matrix Perturbation Method for Closely Spaced Eigenvalues Matrix Perturbation Theory for Complex Modes VIBRATION IN ROTATING MACHINERY H. Sam Samarasekera Introduction Vibration Basics Rotordynamic Analysis Vibration Measurement and Techniques Vibration Control and Diagnostics REGENERATIVE CHATTER IN MACHINE TOOLS Robert G. Landers Introduction Chatter in Turning Operations Chatter in Face-Milling Operations Time-Domain Simulation Chatter Detection Chatter Suppression Case Study FLUID-INDUCED VIBRATION Seon M. Han Description of the Ocean Environment Fluid Forces Examples SOUND LEVELS AND DECIBELS S. Akishita Introduction Sound Wave Characteristics Levels and Decibels HEARING AND PSYCHOLOGICAL EFFECTS S. Akishita Introduction Structure and Function of the Ear Frequency and Loudness Response Hearing Loss Psychological Effects of Noise NOISE CONTROL CRITERIA AND REGULATIONS S. Akishita Introduction Basic Ideas behind Noise Policy Legislation Regulation Measures of Noise Evaluation INSTRUMENTATION Kiyoshi Nagakura Sound Intensity Measurement Mirror-Microphone System Microphone Array SOURCE OF NOISE S. Akishita Introduction Radiation of Sound DESIGN OF ABSORPTION Teruo Obata Introduction Fundamentals of Sound Absorption Sound-Absorbing Materials Acoustic Characteristic Computation Compound Wall Attenuation of Lined Ducts Attenuation of Dissipative Mufflers General Considerations Practical Example of Dissipative Muffler DESIGN OF REACTIVE MUFFLERS Teruo Obata Introduction Fundamental Equations Effects of Reactive Mufflers Calculation Procedure Application Range of Model Practical Example DESIGN OF SOUND INSULATION Kiyoshi Okura Theory of Sound Insulation Application of Sound Insulation STATISTICAL ENERGY ANALYSIS Takayuki Koizumi Introduction Power Flow Equations Estimation of SEA Parameters Application in Structures INDEX

Introduction to Autonomous Mobile Robots

Abstract: Mobile robots range from the Mars Pathfinder mission's teleoperated Sojourner to the cleaning robots in the Paris Metro. This text offers students and other interested readers an introduction to the fundamentals of mobile robotics, spanning the mechanical, motor, sensory, perceptual, and cognitive layers the field comprises. The text focuses on mobility itself, offering an overview of the mechanisms that allow a mobile robot to move through a real world environment to perform its tasks, including locomotion, sensing, localization, and motion planning. It synthesizes material from such fields as kinematics, control theory, signal analysis, computer vision, information theory, artificial intelligence, and probability theory. The book presents the techniques and technology that enable mobility in a series of interacting modules. Each chapter treats a different aspect of mobility, as the book moves from low-level to high-level details. It covers all aspects of mobile robotics, including software and hardware design considerations, related technologies, and algorithmic techniques.] This second edition has been revised and updated throughout, with 130 pages of new material on such topics as locomotion, perception, localization, and planning and navigation. Problem sets have been added at the end of each chapter. Bringing together all aspects of mobile robotics into one volume, Introduction to Autonomous Mobile Robots can serve as a textbook or a working tool for beginning practitioners.

Coverage control for mobile sensing networks

Abstract: This paper presents control and coordination algorithms for groups of vehicles. The focus is on autonomous vehicle networks performing distributed sensing tasks where each vehicle plays the role of a mobile tunable sensor. The paper proposes gradient descent algorithms for a class of utility functions which encode optimal coverage and sensing policies. The resulting closed-loop behavior is adaptive, distributed, asynchronous, and verifiably correct.