Page 16 - Singiresu S. Rao-Mechanical Vibrations in SI Units, Global Edition-Pearson (2017)

ContEntS 13
ChAPtEr 9 ChAPtEr 10
Vibration Control 819 Vibration Measurement and

9.1 Introduction 820 Applications 924
9.2 Vibration Nomograph and Vibration 10.1 Introduction 925
Criteria 821 10.2 Transducers 927
9.3 Reduction of Vibration at the Source 825 10.2.1 Variable-Resistance Transducers 927
9.4 Balancing of Rotating Machines 826 10.2.2 Piezoelectric Transducers 930
9.4.1 Single-Plane Balancing 826 10.2.3 Electrodynamic Transducers 931
9.4.2 Two-Plane Balancing 829 10.2.4 Linear Variable Differential Transformer
9.5 Whirling of Rotating Shafts 835 Transducer 932
9.5.1 Equations of Motion 835 10.3 Vibration Pickups 933
9.5.2 Critical Speeds 837 10.3.1 Vibrometer 935
9.5.3 Response of the System 838 10.3.2 Accelerometer 936
9.5.4 Stability Analysis 840 10.3.3 Velometer 940
9.6 Balancing of Reciprocating Engines 842 10.3.4 Phase Distortion 942
9.6.1 Unbalanced Forces Due to Fluctuations in 10.4 Frequency-Measuring Instruments 944
Gas Pressure 842 10.5 Vibration Exciters 946
9.6.2 Unbalanced Forces Due to Inertia of the 10.5.1 Mechanical Exciters 946
Moving Parts 843 10.5.2 Electrodynamic Shaker 947
9.6.3 Balancing of Reciprocating Engines 846 10.6 Signal Analysis 949
9.7 Control of Vibration 848 10.6.1 Spectrum Analyzers 950
9.8 Control of Natural Frequencies 848 10.6.2 Bandpass Filter 951
9.9 Introduction of Damping 849 10.6.3 Constant-Percent Bandwidth and
9.10 Vibration Isolation 851 Constant-Bandwidth Analyzers 952
9.10.1 Vibration Isolation System with Rigid 10.7 Dynamic Testing of Machines and
Foundation 854 Structures 954
9.10.2 Vibration Isolation System with Base 10.7.1 Using Operational Deflection-Shape
Motion 864 Measurements 954
9.10.3 Vibration Isolation System with Flexible 10.7.2 Using Modal Testing 954
Foundation 872 10.8 Experimental Modal Analysis 954
9.10.4 Vibration Isolation System with Partially 10.8.1 The Basic Idea 954
Flexible Foundation 874 10.8.2 The Necessary Equipment 954
9.10.5 Shock Isolation 875 10.8.3 Digital Signal Processing 957
9.10.6 Active Vibration Control 878 10.8.4 Analysis of Random Signals 959
9.11 Vibration Absorbers 883 10.8.5 Determination of Modal Data from
9.11.1 Undamped Dynamic Vibration Observed Peaks 961
Absorber 884 10.8.6 Determination of Modal Data from
9.11.2 Damped Dynamic Vibration Nyquist Plot 964
Absorber 891 10.8.7 Measurement of Mode Shapes 966
9.12 Examples Using MATLAB 895 10.9 Machine-Condition Monitoring and
Chapter Summary 903 Diagnosis 969
References 903 10.9.1 Vibration Severity Criteria 969
Review Questions 905 10.9.2 Machine Maintenance Techniques 969
Problems 907 10.9.3 Machine-Condition Monitoring
Design Project 922 Techniques 970