'STRUCTURAL DYNAMICS OF CENTRIFUGAL FANS'

摘要

The structural integrity of fans can be affected by the structural dynamic characteristics of the fan wheel. Fan wheels are relatively flexible structural-mechanical systems and contain many modes of natural frequency that can be sensitive to dynamic pressure pulsation developed either as a part of normal fan operation or as the result of aerodynamic conditions such as surge, stall or vortex shedding. Structural dynamic design considerations for centrifugal fan wheels are presented in this paper and are illustrated by finite element analysis.rnThe mechanical reliability of centrifugal fans can be affected by the structural dynamic characteristics of the supporting system. Centrifugal fans are supported by many different methods. These include steel pedestals, concrete foundations, structural steel floors, furnace sidewalls, and isolation bases. Bearing vibration levels can be excessive if the structural support is either resonant or too flexible. Excessive vibration can result in reduced bearing life and fatigue of the structural supports. Structural dynamic design considerations for different types of supporting system are presented in this paper and illustrated by finite element analysis.