Irem Y. Tumer

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The status of fault patterns on part surfaces can provide valuable information about the condition of the manufacturing system. In this work, we aim to develop a reliable fault detection and diagnosis tool in order to assure the automated production of high-quality parts. Such a tool provides a means of integrating the manufacturing and design phases.(More)
Monitoring the condition of parts and machine components is a crucial task in ensuring fault-free manufacturing. In this work, we propose an alternative condition monitoring technique, with great potential in extracting and isolating individual fault patterns from manufacturing signals. We propose that the Karhunen-Lo eve transform provides the ability to(More)
Ensuring the reliability of complex software intensive systems is becoming a critical requirement for all military and commercial aerospace applications, and becomes especially more challenging when implemented for autonomous and evolving deployments required of such applications. To ensure reliability, this research asserts that knowledge, data, and models(More)
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)
During the past several years, an AH-1 Cobra aircraft at the NASA Ames Research Center has been instru-mented 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 some important initial statistical analyses(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)
As part of a collaborative research program betweentory, 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 two-phase test-rig experiment, and are focused on the vibration response of an undamaged pinion(More)
Communicating failure mode information during design and manufacturing is a crucial task for failure prevention. Most processes use Failure Modes and Effects types of analyses, as well as prior knowledge and experience, to determine the potential modes of failures a product might encounter during its lifetime. When new products are being considered and(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)
Complex aerospace systems are often designed in collaborative engineering environments where requirements and design decisions are rapidly made and withdrawn by various subsystems as the process evolves. As a result, the system-level management should continuously re-allocate resources (e.g. capital and labor) among various subsystems such that the main(More)