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Wyszukujesz frazę "Abdollahi, F." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Design and implementation of improved sliding mode controller on 6R manipulator
Autorzy:
Korayem, M. H.
Nekoo, S. R.
Khademi, A.
Abdollahi, F.
Powiązania:
https://bibliotekanauki.pl/articles/280702.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
improved sliding mode control
chattering
DLCC
hardware implementation
Opis:
In this work, we present an improved sliding mode control (ISMC) technique designed and implemented for control of 6R manipulator. Sliding mode control (SMC) is a well-known nonlinear robust method for controlling systems in the presence of uncertainties and disturbances and systems with complex dynamics as in manipulators. Despite this good property, it is difficult to implement this method for the manipulator with a complex structure and more than three degree-of-freedom because of the complicated and massive equation and chattering phenomenon as a property of SMC in control inputs. Here, the chattering phenomenon is eliminated by using an effective algorithm called ISMC and implemented to 6R manipulator by using a low-cost control board based on an ARM microcontroller with high accuracy and memory. The carrying load is considered as the uncertainty for the manipulator, while the dynamic load carrying capacity (DLCC) is considered as a robot performance criterion showing robustness of the controller. The results of simulations and experiments show that the proposed approach has a good performance and is suitable and practical to be applied for manipulators.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 265-280
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sample Preparation Followed by High Performance Liquid Chromatographic (HPLC) Analysis for Monitoring Muconic Acid as a Biomarker of Occupational Exposure to Benzene
Autorzy:
Shahtaheri, S. J.
Ghamari, F.
Golbabaei, F.
Rahimi-Froushani, A.
Abdollahi, M.
Powiązania:
https://bibliotekanauki.pl/articles/91059.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
benzene
muconic acid
sample preparation
solid-phase extraction
biological monitoring
chromatography
Opis:
Factors affecting solid phase extraction (SPE) of trans,trans-muconic acid (ttMA), as a benzene biomarker, including sample pH, sample concentration, sample volume, sample flow rate, washing solvent, elution solvent, and type of sorbent were evaluated. Extracted samples were determined by HPLC-UV (high performance liquid chromatography-ultraviolet). The analytical column was C18, UV wave length was 259 nm, and the mobile phase was H2O/methanol/acetic acid run at flow rate of 1 ml/min. A strong anion exchange silica cartridge was found successful in simplifying SPE. There was a significant difference between recoveries of ttMA when different factors were used (p < .001). An optimum recovery was obtained when sample pH was adjusted at 7. There was no significant difference when different sample concentrations were used (p > .05). The optimized method was then validated with 3 different pools of samples showing good reproducibility over 6 consecutive days and 6 within-day experiments.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 4; 377-388
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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