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- 저자 : Zahra Esmaeily (검색결과 5 건)
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Design Second Order Vibration Reduction
Meysam Kazeminasab,Zahra Esmaeili,Alireza Salehi,Mahdi Mirshekaran,Farzin Piltan 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7
Design of a robust controller for multi input-multi output (MIMO) nonlinear uncertain dynamical system can be a challenging work. This paper focuses on the design and analysis of a high performance adaptive baseline sliding mode control for second order nonlinear uncertain system, in presence of uncertainties to reduce the vibration. In this research, sliding mode controller is a robust and stable nonlinear controller which selected to control of robot manipulator. The proposed approach effectively combines of design methods from switching sliding mode controller, adaptive model-free baseline controller and linear Proportional-Derivative (PD) control to improve the performance, stability and robustness of the sliding mode controller. Sliding mode controller has two important subparts, switching and equivalent. Switching part (discontinuous part) is very important in uncertain condition but it causes chattering phenomenon. To solve the chattering, the most common method used is linear boundary layer saturation method, but this method lost the stability. To reduce the chattering with respect to stability and robustness; linear controller is added to the switching part of the sliding mode controller. The linear controller is to reduce the role of sliding surface slope and switching (sign) function. The nonlinearity term of the sliding mode controller is used to eliminate the decoupling and nonlinear term of link’s dynamic parameters. However nonlinearity term of sliding mode controller is very essential to reliability but in uncertain condition or highly nonlinear dynamic systems it can cause some problems. To solve this challenge the baseline controller is used as online tune or adaptive controller. This controller improves the stability and robustness, reduces the chattering as well and reduces the level of energy due to the torque performance as well.
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Mahshid Rezaei,Zahra Tajary,Zahra Esmaeily,Atefeh Eyvazkhani,Shahrzad Daei,Marjan Mansouri Dara,Mohaddeseh Rezaei,Abolghassem Djazayeri,Ahmadreza Dorosty Motlagh 질병관리본부 2023 Osong Public Health and Research Persptectives Vol.14 No.1
Objectives: Inflammation has been proposed to be one of the main causes of musculoskeletal pain. Diet is a lifestyle factor that plays an important role in managing inflammation; thus, we assessed the inflammatory potential of diets using the empirical dietary inflammatory index (EDII) to investigate the relationship between diet and musculoskeletal pain. Methods: This cross-sectional study included 212 elderly individuals who were selected from health centers in Tehran, Iran. Dietary intake was evaluated using a valid and reliable 147-item food frequency questionnaire. To measure the intensity of pain, a visual analogue scale was used. Multiple linear regression was applied to assess the association between the EDII and musculoskeletal pain. Results: In total, 62.7% and 37.3% of participants had mild and severe pain, respectively. The EDII values were 0.97±0.72 and 1.10±0.66, respectively, in those with mild and severe pain. A higher EDII score was associated with more intense musculoskeletal pain after adjusting for age and sex (β=0.20; 95% confidence interval [CI], 0.06–0.26; p<0.001), but not after adjustment for other confounders (β=–0.13; 95% CI, –1.54 to 0.60; p=0.39). Conclusion: Our findings indicated that higher dietary inflammation might not be associated with musculoskeletal pain in older adults. However, further investigations are required to confirm these findings.
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Mohammad Bazzaz,Mohammad Ali Kafi,Ali Kheyroddin,Zahra Andalib,Hamed Esmaeili 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.2
Braced structures with concentric braces are among earthquake resistant systems that are widely used in frames with jointconnections. Ductility, dissipation of energy and decreasing in base shear are the benefits of these bracing systems. Despite thebenefits mentioned limited ductility of concentric braces, however, caused poor functionality against earthquake. Therefore inthis paper, new bracing system using circular element (circular dissipater) has been evaluated, in order to replace damagedmember without needing rehabilitation or repair of general system. So using nonlinear software package ANSYS a frame withoff-centre bracing system with optimum eccentricity (OBS-C-O) and another frame with same specifications without circularelement (OBS) has been created. The function of general system has been studied for the first time. Linear and nonlinearbehavior of these two frames compared to each other so the benefits of this circular element in an off-centre bracing systemare highlighted. The analytical results and comparison between plots of these two models showed that the first model has higherperformance than the others.
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Hand Tremors Reduction Based on Integral Intelligent Filter Computed Torque Controller
Mahdi Mirshekaran,Farzin Piltan,Nasri Sulaiman,Alireza Salehi,Meysam Kazeminasab,Zahra Esmaeili 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.1
Computed torque controller (CTC) is one of the types of feedback linearization nonlinear controller. This controller works very well in certain positions. However this controller has many advantages in certain conditions but it has challenges in uncertainty. The main challenge in CTC is fluctuations in uncertainties. In this research low pass filter is used to reduce the fluctuations in CTC. To improve the result of this controller intelligent CTC is recommended based on fuzzy logic engineering. In this research fuzzy logic theory is used to tune the new low pass filter CTC coefficients. The process of setting of integral intelligent Computed Torque Controller can be determined as an optimization task. Over the years, use of intelligent strategies for tuning of these controllers has been growing. This research is used to reduce or eliminate the computed torque controller problem based on low pass filter and fuzzy logic theory to control of flexible robot manipulator system and testing of the quality of process control in the simulation environment of MATLAB/SIMULINK Simulator.
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Design FPGA-Based CL-Minimum Control Unit
Farzin Piltan,Omid Avatefipour,Samira Soltani,Omid Mahmoudi,Mahmoud Reza Safaei Nasrabad,Mehdi Eram,Zahra Esmaeili,Sara Heidari,Kamran Heidari,Mohammad Mahidi Ebrahimi 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1
Most of controllers need real time mobility operation so 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). To have higher implementation speed with good performance cMinimum Control Unit (MCU) is implemented on Spartan 3E FPGA using Xilinx software. Design a 4 bits Field Programmable Gate Array (FPGA)- based carry lookahead MCU is the main challenging works. MCU is control unit to control of data transfer between input and output and process the input data. In this research, MCU is used to control the 4 bits, Arithmetic Logic Unit (ALU). Combinational logic characterized by its propagation delay and contamination delay. To reduce the delay hardware description language (HDL) type of programming is very important. To reduce the route delay and logic delay, type of HDL design is very important. In this research, we used lookahead design, which reduce about 10% delay in comparison with ripple carry.
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