An experimental investigation of tribological effects on coastdown phenomena in horizontal rotating machinery

Santhanakrishnan, G.; Prabhu, B.S.; Rao, B.V.A.

doi:10.1016/0043-1648(83)90105-9

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…Sekhar and Prabhu [12] established in their work that there will be severe vibrations in rotating machines with improper alignment of shafts and proposed a theoretical model of a rotor-bearing system using higher-order Finite Element Method (FEM) analysis. The experimental investigation conducted on a flexible rotor hydrodynamic journal bearing has revealed the influence of misalignment on coast down time [13]. Ramachandran et al [14] conducted experiments to approach the misalignment using vibration, orbit, and CDT phenomenon and they found that improper alignment leads to extensive vibration and noise and the increased misalignment reduces the CDT.…”

Section: Introductionmentioning

confidence: 99%

Condition Monitoring of Forward Curved Centrifugal Blower Using Coast Down Time Analysis

Rameshkumar

Rao

Ramachandran

2010

International Journal of Rotating Machinery

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Mechanical malfunctions such as, rotor unbalance and shaft misalignment are the most common causes of vibration in rotating machineries. Vibration is the most widely used parameter to monitor and asses the machine health condition. In this work, the Coast Down Time (CDT), which is an indicator of faults, is used to assess the condition of the rotating machine as a condition monitoring parameter. CDT is the total time taken by the system to dissipate the momentum acquired during sustained operation. Extensive experiments were conducted on Forward Curved Centrifugal Blower Test Rig at selected cutoff speeds for several combinations of combined horizontal and vertical parallel misalignment, combined parallel and angular misalignment, as well as for various unbalance conditions. As mechanical faults increase, a drastic decrease in CDT is found and this is represented as CDT reduction percentage. A specific correlation between the CDT reduction percentage, level of mechanical faults, and rotational cutoff speeds is observed. The results are analyzed and compared with vibration analysis for potential use of CDT as one of the condition monitoring parameter.

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Section: Introductionmentioning

confidence: 99%