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Effect of TiO2 on crystallization kinetics^ microstructure and properties of building glass-ceramics based on granite tailings
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Stereoselective synthesis of oxiranes as a source of isoserine analogues using d-glucosamine and d-glucose derivatives as chiral templates
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Unexpected relationship between specific PML isoforms and the nucleolus
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경도인지장애 노인에게 적용한 웃음요법병합 인지강화 프로그램의 효과
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Catalytic hydrocracking reactions of tetralin as aromatic biomass tar model compound to benzene/toluene/xylenes (BTX) over zeolites under ambient pressure conditions
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Y-doped BaZrO₃ 을 이용한 저온형 박막 연료전지 연구
- 검색키워드
- 저자 : Hamid Maqsood (검색결과 3 건)
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Nonlinear Disturbance Observer Based Sliding Mode Control of Quadrotor Helicopter
Hamid Maqsood,Yaohong Qu 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
This paper develops tracking control of quadrotor unmanned air vehicle in the presence of parametric uncertainties and mismatched exogenous disturbances. First, a traditional sliding mode control (SMC) law is synthesized for a nominal model without parametric uncertainties and disturbances to achieve nominal control performance. Then to compensate the system uncertainties existing in the actual system, gain-scheduling based SMC law is synthesized. However, the gained scheduled SMC does not provide better control performance in the presence of unknown exogenous disturbances existing in actual system. To end this, a novel nonlinear disturbance observer is integrated with gain scheduled SMC to counteract the exogenous disturbances and attain the performance of reference nominal model. The proposed nonlinear disturbance observer SMC method exhibits the following two salient characteristics: frst, the design gains should be greater than the bound of disturbance estimation error rather than that of disturbances, second; in the absence of uncertainties the nominal control performance of sliding mode control strategy is retained. The stability analysis of the proposed control strategy is validated using Lyapunov theorem. Finally, numerical simulation results are exhibited to illustrate the efcacy of the proposed control strategy.
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Disturbance Observer Based Robust Sliding Mode Control of Permanent Magnet Synchronous Motor
Nihad Ali,Ateeq Ur Rehman,Waqar Alam,Hamid Maqsood 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6
This paper addresses speed control of permanent magnet synchronous motor under load torque perturbations. The mathematical model is derived using park’s transformation. The load torque disturbance is considered unknown bounded, and states variables are available in feedback. In order to achieve robust speed performance, sliding mode control (SMC) is introduced. However, it is noted that conventional SMC does not provide satisfactory performance under load torque disturbances. To end this, a novel control strategy called disturbance observer SMC (DOSMC) is formulated. It includes an observer that ofers a tool to vanish the efect of load torque. The DOSMC technique has two distinguished characteristics: frst, the design gains are needed to be greater than the maximum limit of disturbance estimation error instead of disturbances, second; the proposed observer estimates load disturbances and provide a compensator to update sliding surface and control input. The stability analysis of overall control system is verifed using Lyapunov theorem. Simulations in MATLAB/Simulink proves efcacy of the proposed scheme.
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Fahmida Mir Akbar,Mohsin Zafar,Abdul Hamid,Maqsood Ahmed,Abdul Khaliq,Muhammad Riaz Khan,Zahid ur Rehman 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.6
Pea (Pisum sativum L.) has increasing nutritional, commercial, and economical value, and initial low supply of N and Co is needed to increase nodulation, yield, and profit. A field experiment in 2010 was conducted at the University of Poonch Rawalakot located in the hilly region of the state of Azad Jammu and Kashmir, Pakistan. The aim of the study was to evaluate the effects of fertilization of N and Co on growth, nodulation, seed yield, seed composition of, and uptake of N and Co by pea plant. Treatments included three levels of N (0, 30, and 60 kg N·ha-1 and represented as N0, N30, and N60, respectively) combined with three levels of Co (0, 10, and 20 g Co·ha-1and represented as Co0, Co10, and Co20, respectively), and the control represented as N0Co0. Results indicated that most of the morphological characteristics were increased with N60. The greatest shoot length, root length, and chlorophyll content were recorded in the N60Co20. The number of root nodules increased from 6 in the control to 19with fertilization of N and Co. Yield responses to N–Co fertilization occurred to all rates, and the highest yield,2536 kg·ha-1, was observed in the treatment N60Co10. Total N and Co uptake in the plant (shoot + root + seed)ranged between 16-147% and 3-331% over the control, while seed protein increased by 13–198% over the control by application of N and Co. This study demonstrates that N- and Co-deficient soils are likely to produce crops with low yields and seeds with low protein levels, and therefore, appropriate management of soil N and Co could be an effective approach to increase and sustain pea production in the small holding mountain ecosystems.
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