Irem Y. Tumer

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In this paper, we present the current state of a failure mode taxonomy, and discuss its potential to explore the failure mode space of aerospace applications. More fundamentally, we discuss what constitutes a good description of a failure that can be detected at the conceptual design stage. Elemental (physics-based) descriptions of failure modes are derived(More)
Statistical analyses of transmission vibration patterns from an AH-1 Cobra helicopter were previously reported. Fourteen steady-state maneuvers were analyzed using multi-factor analysis of covariance. Based on triaxial recordings, it was found that only two maneuvers displayed reliably stationary time-series: low and high power forward climb. Principal(More)
During the past several years, an AH-1 Cobra aircraft at the NASA Ames Research Center has been instrumented with tri-axial accelerometers and a data acquisition system to support the experimental study of inflight transmission vibration patterns. This paper describes the on-board HealthWatch system and presents some important initial statistical analyses(More)
Research on the nature of the vibration data collected from helicopter transmissions during flight experiments has led to several crucial observations believed to be responsible for the high rates of false alarms and missed detections in aircraft vibration monitoring systems. This work focuses on one such finding, namely, the need to consider additional(More)
Detection of faults is a continuing need in all manufacturing processes. This need is more pronounced in new manufacturing processes where continual product improvement is desired. In this paper, a systematic approach is developed for addressing this need. Contemporary experimental and surface analysis techniques provide a basis for incrementally diagnosing(More)
As part of a collaborative research program between NASA Ames Research Center (ARC), NASA Glenn Research Center (GRC), and the U.S. Army Laboratory, a series of experiments is being performed in GRC’s 500 HP OH-58 Transmission Test Rig facility and ARC’s AH-1 Cobra and OH-58c helicopters. The findings reported in this paper were drawn from Phase-1 of a(More)
During the past several years, an AH-1 Cobra aircraft at the NASA Ames Research Center has been instrumented with tri-axial accelerometers and a data acquisition system to support the experimental study of in-flight transmission vibration patterns. This paper describes the on-board HealthWatch system and presents important statistical analyses of the(More)