tailieunhanh - Harris' Shock and Vibration Handbook Part 13

Tham khảo tài liệu 'harris' shock and vibration handbook part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THEORY OF VIBRATION ISOLATION TABLE Transmissibility and Motion Response for Isolation Systems Defined in Table Continued Where the equation is shown graphically the applicable figure is indicated below the equation. See Table for definition of terms. Note 4 These curves apply only for N 3. Note 5 This equation applies only when excitation is defined in terms of displacement amplitude for excitation defined in terms of force or acceleration see Eq. . INFLUENCE OF DAMPING IN VIBRATION ISOLATION The nature and degree of vibration isolation afforded by an isolator is influenced markedly by the characteristics of the damper. This aspect of vibration isolation is evaluated in this section in terms of the single degree-of-freedom concept . the equipment and the foundation are assumed rigid and the isolator is assumed massless. The performance is defined in terms of absolute transmissibility relative transmissibility and motion response for isolators with each of the four types of dampers illustrated in Table . A system with a rigidly connected viscous damper is discussed in detail in Chap. 2 and important results are reproduced here for completeness isolators with other types of dampers are discussed in detail here. The characteristics of the dampers and the performance of the isolators are defined in terms of the parameters shown on the schematic diagrams in Table . Absolute transmissibility relative transmissibility and motion response are defined analytically in Table and graphically in the figures referenced in Table . For the rigidly connected viscous and Coulomb-damped isolators the graphs generally are explicit and complete. For isolators with elastically connected dampers typical results are included and references are given to more complete compilations of dynamic characteristics. CHAPTER THIRTY RIGIDLY CONNECTED VISCOUS DAMPER Absolute and relative transmissibility curves are shown graphically in Figs. and

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