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RISS 인기검색어
- 검색키워드
- 저자 : ( Saman Nazari ) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Design Single Chip Micro-Based Controller for First Order Delays System
Saman Namvarrechi,Samira Soltani,Iman Nazari,Ali Roshanzamir,Arman Jahed 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
Design a delay free FPGA-based Proportional-Integral-Derivative (PID) controller to control of first order delay system is the main objective in this research. In order to provide high performance micro-based controller, FPGA-based PID controller based on design Derivative and Integral algorithm is selected. Conventional PID controller is a stable linear type model-free controller that reduces the delay time in first order delay system. This controller has acceptable performance in presence of uncertainty (e.g., overshoot=0%, rise time=0.8 second, steady state error = 1e-9 and RMS error=1.8e-12). In this research, linear controller need real time mobility operation, and one of the most important devices which can be used to solve this challenge is Field Programmable Gate Array (FPGA). FPGA can be used to design a controller in a single chip Integrated Circuit (IC). In HDL based derivative algorithm the minimum input arrival time before clock is 16.466 ns and the maximum frequency is 60.73 MHz, but in the best design action, the maximum frequency to design this single chip algorithm should be 63.629 MHz. In HDL integral algorithm the minimum input arrival time before clock is 15.599 ns and the maximum frequency is 64.1 MHz, but in the best design action, the maximum frequency to design this single chip algorithm should be 178.190 MHz.
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Design a Methodology to Model-Reference Control of First Order Delays System
Arman Jahed,Farzin Piltan,Saman Namvarrechi,Iman Nazari,Ali Roshanzamir,Nasri B. Sulaiman 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.3
Design a nonlinear controller for second order nonlinear uncertain dynamical systems is one of the most important challenging works. This research focuses on the design, and analysis of a model-reference sliding mode controller for first order delay system, in presence of uncertainties. In order to provide high performance nonlinear methodology, model-reference sliding mode controller is selected. Pure sliding mode controller can be used to control of partly known nonlinear dynamic parameters. Conversely, pure sliding mode controller is used in many applications; it has an important drawback namely; chattering phenomenon. To attenuation the chattering, new filter based high speed control technique is introduced. In this technique, two type derivative techniques are used to improve the rate of delay as well stability, robustness and chattering attenuation. This technique cased to improve the rate of delay compare with conventional PID controller and conventional sliding mode controller.
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Effect of Menstrugole on primary dysmenorrhea: a randomized clinical trial
( Fatemeh Shobeiri ),( Sasan Nazari ),( Saman Nazari ),( Ensiyeh Jenabi ),( Arezoo Shayan ) 대한산부인과학회 2018 Obstetrics & Gynecology Science Vol.61 No.6
Objective Primary dysmenorrhea occurs in more than 50% of women of reproductive age. This survey evaluated the effects of Menstrugole on the alleviation of primary dysmenorrhea. Methods This study was performed in western Iran between August 15 and December 15, 2017, in female students with primary dysmenorrhea. The students were randomly divided into 2 groups and received placebo or a Menstrugole capsule for 3 days in each of 2 menstrual cycles. The visual analog scale was used to assess pain severity. The χ<sup>2</sup>-test, one-way analysis of variance, and the paired t-test were used for statistical evaluation. Results We compared the severity of pain between the 2 groups. There was a significant change in the mean pain score during the first (P<0.001) and second months (P<0.001) after the use of Menstrugole, compared with that in the placebo group. Conclusion Menstrugole decreased pain severity in female students, and can be considered by health care providers for treatment of primary dysmenorrhea.
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Research on Nonlinear Automation for First Order Delays System
Ali Roshanzamir,Farzin Piltan,Arman Jahed,Saman Namvarchi,Nasri B. Sulaiman,Iman Nazari 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.9
First order delay system (FODS) is in class of nonlinear systems. In these systems design control algorithms are very important. In this research nonlinear terms of incremental Proportional Integral Derivative (PID) algorithm is used to nonlinear model-free integrate large amounts of control methodology in a single methodology. This work, proposes a developed method to design nonlinear based PID controller. In this methodology nonlinear model-free sliding mode algorithm help incremental PID to estimate and linearization of first order delay system. According to this research, the controller robustness improved based on nonlinear term of sliding mode algorithm and the chattering is reduced/eliminate based on PID incremental method.
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