Ambient Vibration Monitoring

Helmut Wenzel 지음

Wiley 2005년 12월 13일 출간

작품소개

책소개

In-operation vibration monitoring for complex mechanical structures and rotating machines is of key importance in many industrial areas such as aeronautics (wings and other structures subject to strength), automobile (gearbox mounting with a sports car body), rail transportation, power engineering (rotating machines, core and pipes of nuclear power plants), and civil engineering (large buildings subject to hurricanes or earthquakes, bridges, dams, offshore structures). Tools for the detection and the diagnosis of small changes in vibratory characteristics are particularly useful to set up a preventive maintenance policy based on the actual evolution of the state of the monitored machine or structure, as opposed to systematic a priori planning.Ambient Vibration Monitoring is the backbone of such structural assessment monitoring and control. It provides the possibility to gain useful data under ambient conditions for the assessment of structures and components.Written by a widely respected authority in this area, Ambient Vibration Monitoring describes the current practice of ambient vibration methodologies illustrated by a number of practical examples. Designed to aid the practical engineer with their understanding of the topic, it is the culmination of many years of practical research and includes numerous -real world- examples. It also provides information on applicable solutions.This book will enable not onlypractitioners (in civil, mechanical and aerospace engineering), but also researchers and students,to learn more about the theory and practical applications of this subject.

목차

PREFACE.ACKNOWLEDGEMENTS.SUMMARY.1 INTRODUCTION.1.1 Scope of Applications.1.2 Laws and Regulations.1.3 Theories on the Development of the AVM.2 OBJECTIVES OF APPLICATIONS.2.1 System Identification.2.1.1 Eigenfrequencies and Mode Shapes.2.1.2 Damping.2.1.3 Deformations and Displacements.2.1.4 Vibration Intensity.2.1.5 Trend Cards.2.2 Stress Test.2.2.1 Determination of Static and Dynamic Stresses.2.2.2 Determination of the Vibration Elements.2.2.3 Stress of Individual Structural Members.2.2.4 Determination of Forces in Tendons and Cables.2.3 Assessment of Stresses.2.3.1 Structural Safety.2.3.2 Structural Member Safety.2.3.3 Maintenance Requirements and Intervals.2.3.4 Remaining Operational Lifetime.2.4 Load Observation (Determination of External Influences).2.4.1 Load Collective.2.4.2 Stress Characteristic.2.4.3 Verification of Load Models.2.4.4 Determination of Environmental Influences.2.4.5 Determination of Specific Measures.2.4.6 Check on the Success of Rehabilitation Measures.2.4.7 Dynamic Effects on Cables and Tendons.2.4.8 Parametric Excitation.2.5 Monitoring of the Condition of Structures.2.5.1 Assessment of Individual Objects.2.5.2 Periodic Monitoring.2.5.3 BRIMOS_ Recorder.2.5.4 Permanent Monitoring.2.5.5 Subsequent Measures.2.6 Application of Ambient Vibration Testing to Structures for Railways.2.6.1 Sleepers.2.6.2 Noise and Vibration Problems.2.7 Limitations.2.7.1 Limits of Measuring Technology.2.7.2 Limits of Application.2.7.3 Limits of Analysis.2.7.4 Perspectives.References.3 FEEDBACK FROM MONITORING TO BRIDGE DESIGN.3.1 Economic Background.3.2 Lessons Learned.3.2.1 Conservative Design.3.2.2 External versus Internal Pre-stressing.3.2.3 Influence of Temperature.3.2.4 Displacement.3.2.5 Large Bridges versus Small Bridges.3.2.6 Vibration Intensities.3.2.7 Damping Values

작가정보

저자(글) Helmut Wenzel