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  • Moshrefifar and Azamfar method, a new cycle counting method for evaluating fatigue life

    Article thumbnail: Moshrefifar and Azamfar method, a new cycle counting method for evaluating fatigue life
    Type:
    Article
    Description/Abstract:
    It is shown in present study that Rainflow method is unable to accurately estimate fatigue life ofcomponents under random loading, almost always. The inconsistencies between results of Rainflowmethod and hysteresis curve are also discussed. Alike the Peak counting method, it is shown that Shadowmethod doesn’t consider the possibility of deformation within individual cycles. Hence, Moshrefifar andAzamfar method is proposed as a novel technique having accurate results in different analytical condi-tions which are in good consistence with results obtained from hysteresis curves. Authors finally proposean algorithm as well as a C language program for this method.
    Creator/Author:
    Moshrefifar, Masoud and Azamfar, Moslem
    Submitter:
    azamfamm@mail.uc.edu
    Date Uploaded:
    06/14/2019
    Date Modified:
    06/14/2019
    License:
    All rights reserved

  • Simple Formulae for Control of Industrial Time Delay Systems

    Article thumbnail: Simple Formulae for Control of Industrial Time Delay Systems
    Type:
    Article
    Description/Abstract:
    Control of time delay integrating systems is a challenging and ongoing research. In this paper a new structure for control of stable and integrating time delay systems is presented. The control design process is as simple as selection of some constant gains, for which simple formulae are introduced. The design methods are derived analytically, while no fractional approximation for the time delay term of the plant transfer function is used. Simulation, as well as, experimental studies reveal the exceptional effectiveness of the proposed methods in achieving a robust and well-performing tracking, even when the plant pure time delay is very large. © 2016, Brazilian Association of Computational Mechanics. All rights reserved.
    Creator/Author:
    H. Davaie Markazi, Amir and Azamfar, Moslem
    Submitter:
    azamfamm@mail.uc.edu
    Date Uploaded:
    06/14/2019
    Date Modified:
    06/14/2019
    License:
    All rights reserved