The vibration isolation of vibration-sensitive/precision objects is rightly considered to be the most important case. However, there are many other situations in which the appropriately applied principles of vibration isolation can be very beneficial. Also, even the objects of the highest precision, while requiring a deep isolation from external disturbances, may themselves be producers of intense dynamic loads and vibrations.
This Chapter gives a systematic treatment of the principal cases wherein vibration isolation is or can be required. The most important case is that of vibration sensitive objects, for which a detailed analysis is given, together with the procedures for selecting parameters of the vibration isolation means. The very important side issues of static rigidity, rocking of the object, and self-generated intense dynamic loads are also addressed.
2.1 General Comments
2.1.1 Damping vs. Heat Generation in Vibration Isolators
2.2 Isolation of Vibration-Sensitive Objects
2.2.1 Ambient Vibrations
2.2.2 Detrimental Effects of Vibration
2.2.3 Model of Vibration Transmission
2.2.4 Principles and Criteria of Vibration Isolation
2.2.4A Isolation from Steady-State Vibration
2.2.4B Practical Selection of Vibration Isolation Parameters for Precision Objects
2.2.4C Isolation from Impulsive Vibration
2.2.5 Vibration Isolation Systems
2.2.6 Side Issues for Vibration Isolated Precision Equipment
2.2.6A Reduction of Mobility of Isolated Objects Caused by Internal Dynamic Forces
2.2.6B Influence of Vibration Isolation on Effective Stiffness of Isolated Object
2.2.7 Vibration Protection of Civil Engineering Structures
2.3 Isolation Requirements for Vibration-Producing Objects
2.3.1 Objects Producing Single Frequency Excitations
2.3.1A Objects Producing Unidirectional Excitation
2.3.1B Objects Producing Multidirectional Excitation
2.3.2 Objects Producing Polyharmonic Excitations
2.3.3 Objects Producing Conservative Impact Excitations
2.3.4 Objects Generating Pulses of Inertial Nature
2.4 General Purpose Machinery and Equipment
2.4.1 Influence of Mounting Conditions on Dynamic Stability (Chatter)
2.4.2 Vibration Levels of General Purpose Machines
2.4.3 Influence of Vibration Isolation on Bearing Loads
2.4.4 Influence of Vibration Isolation on Noise
2.5 Vibration Isolated Objects Installed on Non-Rigid Supporting Structures
2.6 Engine and Machinery Mounting in Vehicles
2.7 Experimental Selection of Isolators
2.8 Role of Damping in Vibration Isolation
References
