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References: Fan Bases and Vibration Isolation

  1. Vibration isolation - Wikipedia - Explains passive isolation with springs, elastomer pads and mounts, including how natural frequency and isolator stiffness decide performance. It is the general background for this chapter's isolator families.

  2. Vibration - Wikipedia - Covers free and forced vibration of a spring-mass system, including the frequency response that underlies transmissibility. It supports the chapter's forcing frequency, natural frequency and frequency ratio calculations.

  3. Mechanical resonance - Wikipedia - Describes what happens when a forcing frequency matches a structure's natural frequency. It explains why an isolator at a frequency ratio of 1 produces large motion instead of isolation.

  4. Mechanical Vibrations (4th edition) - J. P. Den Hartog - McGraw-Hill (reprinted by Dover) - Den Hartog is known for explaining single-degree-of-freedom response and vibration isolation through physical reasoning and minimal mathematics. That approach suits this chapter's practical use of the transmissibility curve.

  5. Harris' Shock and Vibration Handbook - Cyril M. Harris and Charles E. Crede (original editors) - McGraw-Hill - The standard engineering reference on shock and vibration. Crede's isolation work shaped its treatment of isolator selection, deflection and transmissibility for mounted machinery.

  6. FanPedia: The Fan & Blower Encyclopedia (PDF) - Twin City Fan - The source for base types and vibration isolation (pp. 131-135), inlet box mounting planes (p. 143), shaft accessories (p. 129), piezometer rings (pp. 158-160) and technical descriptions.

  7. FanPedia online - Twin City Fan - The web edition of FanPedia, covering the same accessory and installation topics. Use it with the current catalogs, which take priority when they differ from FanPedia.

  8. Vibration Isolation of Fans (FE-1900) - Twin City Fan Fan Engineering Letter - Charts transmissibility and isolation efficiency against deflection and disturbing frequency. It also discusses springs, pads, structure stiffness and inertia bases, extending the chapter's isolator calculations.

  9. Fan & Fan System Vibration (FE-200) - Twin City Fan Fan Engineering Letter - Discusses fan vibration sources, measurement and how vibration specifications should be written. It is useful context for the chapter's section on why vibration matters.

  10. Centrifugal Fans Installation, Operation and Maintenance Manual (IM-995) - Twin City Fan - Field instructions for centrifugal fans, including a section on foundations and supporting structures. It shows how the base and support decisions in this chapter are carried out on site.