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  • Extension of early stage failure analysis tools to Prognostics Health Management design

    Creator:
    Kramer, Scott
    Abstract:
    Modern complex mechanical systems have evolved to a point of incredible complexity. Many now operate with significant assistance from automated response functions, and some operate without human operators at all. These increasingly complex systems have also become more expensive and more ambitions in mission, bringing about higher risk to both...
    Resource Type:
    Masters Thesis
    Full Text:
    component interactions and understanding of failure propagation paths throughout the system. A

  • Evaluation of failure diagnosis in conceptual design of mechanical systems

    Creator:
    Ruff, David N.
    Abstract:
    A methodology for improving quality and reducing life cycle costs of mechanical systems is described. The principal concept is that a system can be designed, in the conceptual stages, to be easier to diagnose for failures. To perform this, functional decomposition and form to function mapping are utilized both as...
    Resource Type:
    Masters Thesis
    Full Text:
    Mechanical Engineering presented on July 9. 1992 . Title: Evaluation of Failure Diagnosis in Conceptual

  • Methodologies to improve reliability engineering in early design

    Creator:
    O'Halloran, Bryan M.
    Abstract:
    This thesis is the summation of two publications with the motivation to move reliability analysis earlier in the design process. Current analyses aim to improve reliability after components have been selected. Moving specific analyses earlier in the design process reduces the cost to the designer. These early design analyses provide...
    Resource Type:
    Masters Thesis
    Full Text:
    failure rates are used in the Early Design Reliability Method (EDRM) to calculate system level

  • Design analysis using function-based failure propagation in failed system states

    Creator:
    Jensen, David Charles
    Abstract:
    For safety critical complex systems, reliability and risk analysis are important design steps. Implementing these analyzes early in the design stage can reduce costs associated with redesign and provide important information on design viability. In the past several years, various research methods have been presented in the design community to...
    Resource Type:
    Masters Thesis
    Full Text:
    USING FUNCTION-BASED FAILURE PROPAGATION IN FAILED SYSTEM STATES

  • Failure state identification for requirements development during complex system design

    Creator:
    Mueller, Jonathan D.
    Abstract:
    The increasing level of complexity in systems creates a growing challenge for engineers to design safe and reliable systems. The growing complexity can lead to possible moments when situations occur that were unanticipated or were not known that they could occur by designers and leave the system in an undesirable...
    Resource Type:
    Masters Thesis
    Full Text:
    Mechanical Engineering presented on June 5, 2009. Title: Failure State Identification For Requirements

  • Diagnostic modeling and diagnosability evaluation of mechanical systems

    Creator:
    Clark, Garrett E.
    Abstract:
    Consideration of diagnosability in product design promises to increase product quality by reducing maintenance time without increasing cost or decreasing reliability. Methods for investigating the diagnosability of mechanical and electro-mechanical systems are described and are applied to the Bleed Air Control System (BACS) on the Boeing 747-400. The BACS is...
    Resource Type:
    Masters Thesis
    Full Text:
    failure types and their effects on the system aids with the diagnosability evaluation. The BACS also

  • A framework to model reliability and failures in complex systems during the early engineering design process

    Creator:
    O'Halloran, Bryan M.
    Abstract:
    An open area of research in complex systems is to move reliability and failure assessments earlier in the engineering design process. When compared to later design, early decisions are cost effective and have a large impact on the system. Standard methods are limited by the availability of data and often...
    Resource Type:
    Dissertation
    Full Text:
    systems is to move reliability and failure assessments earlier in the engineering design process. When

  • Detection of induction motor stator abnormalities using motor current signature analysis

    Creator:
    Bin Eid, Ghassan A.
    Abstract:
    Induction motors are considered to be the work horse in all types of today's industries. In all mechanical applications, using an induction motor is considered to be the preferable, if not the optimum selection. Their failures, on the other hand, cause an interruption equal to their volume of dependency in...
    Resource Type:
    Masters Thesis
    Full Text:
    of Master of Science in Electrical and Computer Engineering presented on December 6, 2004. Title

  • Estimation of physical parameters in mechanical systems for predictive monitoring and diagnosis

    Creator:
    Nickel, Thomas
    Abstract:
    Monitoring, diagnosis and prediction of failures play key roles in automatic supervision of machine tools. They have received much attention because of the potential for reduced maintenance expenses, down time, and an increase in the equipment utilization level. At present, signal analysis techniques are predominantly used. But methods involving system...
    Resource Type:
    Dissertation
    Full Text:
    knowledge about the system and engineering intuition needs to be used to choose a suitable model. Based

  • Detection of incipient rotor bar faults and air-gap asymmetries in squirrel-cage motors using stator current monitoring

    Creator:
    Al Tuaimi, Hamad A.
    Abstract:
    Preventative motor fault detection is of prime importance for modern plant management. During research into rotor faults, performed at the Motor Systems Resource Facility (MSRF), an optimized rotor fault detection and classification method was proposed. In critical process applications, the suggested method would provide the foundation for continually monitoring a...
    Resource Type:
    Masters Thesis
    Full Text:
    degree of Master of Science in Electrical and Computer Engineering presented on March 14, 2005. Title