Torsional vibration is often overlooked in field measurements due to installation challenges, limited reliability of instrumentation, and complexities in signal processing. However, torsional effects can couple into lateral (radial) vibration through gear mesh interactions, making them observable in conventional vibration data. This paper discusses the manifestation of torsional–lateral coupled vibration, excitation sources, measurement methodologies, and modeling approaches,

Operating Deflection Shape (ODS) analysis is a highly effective technique for diagnosing and identifying the root causes of structural...