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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Entropy,External Factors,Choquet integral,HSE,Variance of capacity
- چکیده:
- چکیده انگلیسی: Nowadays, industrialization exposes the human and environment resources to serious dangers. The importance of these resources caused the HSE (health, safety and environment) to have a significant contribution in industries’ evaluation, especially in construction industry. While evaluating the project’s success from an HSE point of view, it is not enough to rely solely on the outputs without considering the impact of external factors affecting them. On the other hand, the variety of factors affecting HSE and their different kinds of interactions, forces us to use another aggregation operators rather than linear ones. Choquet integral (CI) is a well-known powerful aggregation operator to be used in such cases. There are different methods to define the coefficients of CI. One of the most recent and prominent methods is “the most representative capacity definition method”. This paper proposes a modification to this method by improving its entropy and consequently the reliability in, as named, non-reference projects evaluation. The modified algorithm is used in evaluating the impact of external factors on HSE performance of power plant construction projects. The results show the prominence of modified algorithm’s entropy compared to the original algorithm. Ultimately the external factors integrated score, which resembles the suitability of project’s environment, is compared with the score defined considering output results. According to results, in some projects there is a deep gap between score of HSE output result and aggregated score of external factors. The gap of two scores potentially figures the internal organizational factors performance.
- انتشار مقاله: 01-05-1393
- نویسندگان: Nasim Nahavandi,Roghayeh Hemmatjou,Behzad Moshiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Feedback linearization,model predictive control,Constraints,Fault Tolerant Control,Feasible direction method
- چکیده:
- چکیده انگلیسی: A Fault-Tolerant Control (FTC) methodology has been presented for nonlinear processes being imposed by control input constraints. The proposed methodology uses a combination of Feedback Linearization and Model Predictive Control (FLMPC) schemes. The resulting constraints in the transformed process will be dependent on the actual evolving states, making their incorporation in the design context a non-trivial task. A feasible direction method has been integrated in the design procedure based on active set technique to resolve the challenging constraint–based FLMPC problem. The formulated FLMPC design method is utilized to develop a FTC scheme by providing a set of backup control configurations for a CSTR benchmark process. The successful performance of the proposed FTC methodology has been demonstrated via a category of common fault scenarios by exercising an arbitrary replacement of control configurations through a supervisor to maintain the CSTR operation at an unstable desired steady-state point.
- انتشار مقاله: 02-11-1389
- نویسندگان: Jamal Gholami Ahangarani,,Karim Salahshoor,Behzad Moshiri
- مشاهده