Classification Trees and the Analysis of Helicopter Vibration Data
Larson, Harold J.
MetadataShow full item record
Health and Usage Monitoring Systems are receiving a great deal of interest, in an attempt to increase the safety and operational readiness of helicopters, and to minimize maintenance costs. These systems monitor (and can record) various flight parameters, pilot conversations, engine exhaust debris, metallic chip detector levels in the lubrication system, rotor track and balance, as well as vibration levels at selected locations throughout the airframe and the power drive system. Vibration levels are currently being observed on two operational SH-60B helicopters and on an H-60 power drive system installed in the Helicopter Transmission Test Facility (HTTF) at the Naval Air Warfare Center, Trenton, NJ. This paper employs classification trees to analyse vibration signatures produced in the HTTF, identifying those characteristics which distinguish normal signatures from signatures produced by known faulted parts. These trees are quite successful in separating the two types of signatures and achieve small misclassification rates for HTTF data. They are also applied to vibration data collected from an operational aircraft; assuming the tail gearbox in the operational aircraft has no faults, the trees derived from the HTTF produce a high proportion of false alarms
NPS Report NumberNPS-OR-97-017
Showing items related by title, author, creator and subject.
Young, Jonathan C. (Monterey California. Naval Postgraduate School, 2006);The primary objective of this these was to study the feasibility of using a MEMS accelerometer to monitor vibration signatures of a machine to determine if the machine is operating properly. The secondary objective was ...
Shin, Y. S.; Jeon, Jae-Jin (Monterey, California. Naval Postgraduate School, 1993-08-17); NPS-ME-93-004Wavelet transform is applied to the analysis of vibration signatures in order to verify the ability of the detection of abnormal condition. It can well describe the dynamics of the signal's spectral composition of a non- ...
Armstrong, Robert A. (Monterey, California. Naval Postgraduate School, 1996-12);A Diesel Engine test cell was developed, which consisted of a Detroit Diesel 3-53 engine, a water brake dynamometer and an engine cycle analyzer. Extensive steady state and time resolved instrumentation were installed along ...