Mohammad Sadrnia | Shahrood University of Technology (original) (raw)

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Papers by Mohammad Sadrnia

Computational Intelligence and Neuroscience, 2014

Occurrence of faults in wind energy conversion systems (WECSs) is inevitable. In order to detect ... more Occurrence of faults in wind energy conversion systems (WECSs) is inevitable. In order to detect the occurred faults at the appropriate time, avoid heavy economic losses, ensure safe system operation, prevent damage to adjacent relevant systems, and facilitate timely repair of failed components; a fault detection system (FDS) is required. Recurrent neural networks (RNNs) have gained a noticeable position in FDSs and they have been widely used for modeling of complex dynamical systems. One method for designing an FDS is to prepare a dynamic neural model emulating the normal system behavior. By comparing the outputs of the real system and neural model, incidence of the faults can be identified. In this paper, by utilizing a comprehensive dynamic model which contains both mechanical and electrical components of the WECS, an FDS is suggested using dynamic RNNs. The presented FDS detects faults of the generator's angular velocity sensor, pitch angle sensors, and pitch actuators. Robu...

This paper mainly aims to determine the optimal drug dosage for the purpose of reducing the popul... more This paper mainly aims to determine the optimal drug dosage for the purpose of reducing the population of cancer cells in melanoma patients. To do so, Reinforcement Learning method and the eligibility traces algorithm are employed, giving us the advantage of creating a compromise between the two algorithms of the reinforcement learning, being Monte-Carlo and Temporal Difference. Furthermore, it can be said that using this approach, there was no need to employ a mathematical model in the whole process. However, as its implementation on the real system was not possible, a delayed nonlinear mathematical model is used to investigate the performance of the proposed controller and simulate the behavior of the environment. It should be noted this mathematical model made use of no control method. This is the first time that population control of cancer cells is applied and tested on this model. To know of the optimal dosage of the drug, it should be mentioned that the drug is required to pr...

International Journal of Engineering Systems Modelling and Simulation, 2015

One of the most important features of energy generation sources is robustness of their structure ... more One of the most important features of energy generation sources is robustness of their structure against faults. Wind energy conversion systems (WECSs) are generally subjected to occurrence of various faults. Many modelling techniques which have been already introduced for the modelling of the faults or observing the influences of the faults cannot be considered wide-ranging to include any fault at any point of the WECS. On the other hand, for the purpose to explore the impacts of faults on several components of the WECS and probably improving the future design of it, a type of model is required in which mechanical and electrical parts are modelled properly with some details. In this paper, a comprehensive dynamic model for the WECS is presented by which a variety of faults such as sensors, actuators and power grid faults can be studied and effects of these faults on voltage, current and other signals of the WECS can be investigated. In addition, the dynamic model described by this paper can be applied simply to design the fault detection, fault tolerant control and protection systems of the WECS.

This paper presents a fault tolerant approach for overactuated-oversensed systems subject to mult... more This paper presents a fault tolerant approach for overactuated-oversensed systems subject to multiplicative and additive faults. The main idea is to use a reconciliatory unit in charge to discover online the possibly faulty physical sensors and exclude their measures from the generation of the ”virtual” sensors. In the proposed approach, the energetic based approach has been used to estimate the actuator multiplicative faults. In the next step, an unknown input observer has been coupled with the energetic based estimator to estimate sensor multiplicative and additive faults. Finally, the control allocation approach has been used to reach the desire output. Finally, a simulation example is reported in details to show the effectiveness of the scheme.

— یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها د... more — یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها در برابر انواع خطاهاست. سیستم‌های تبدیل انرژی بادی نیز همانند سایر فرآیندها در معرض انواع خطاها قرار دارند. برای بررسی نحوه اثرگذاری خطا بر تمامی اجزای سیستم تبدیل انرژی بادی، نیاز به مدلی است که هم قسمت‌های مکانیکی و هم قسمت‌های الکتریکی را به نحو مناسبی مدل‌ سازی کند. مدل سازی مناسب سیستم تبدیل انرژی بادی، به همراه بررسی دقیق نحوه اثرگذاری خطاها بر آن، می تواند منجر به بهبود طرح‌های آینده در ساخت آن شود. در این تحقیق، یک مدل دینامیکی جامع برای سیستم تبدیل انرژی بادی ارائه می شود که توسط آن می توان انواع خطاها از قبیل خطای سنسورها، محرک‌ها و شبکه قدرت را مورد بررسی قرار داد و اثر آن خطاها را بر سیگنال‌های مختلف سیستم مشاهده نمود. این در حالی است که مدل‌هایی که تاکنون ارائه شده‌اند دارای این ضعف هستند که در آنها نمی‌توان خطاها را در قسمت‌های مختلف سیستم مدل سازی و اثر آن‌ها را در قسمت‌های مختلف سیستم مشاهده نمود. از این مدل می‌توان برای طراحی سیستم‌های تشخیص خطا، کنترل تحمل‌پذیر خطا و مدا...

Proceedings of the 10th Wseas International Conference on Systems, Jul 10, 2006

Interaction phenomenon in multi-input multi-output (MIMO) systems is an essential difficulty of c... more Interaction phenomenon in multi-input multi-output (MIMO) systems is an essential difficulty of controllers planning. To design the appropriate controller in multivariable systems, the interaction in the system must be measured. The theories for planning decouplers are valid only for minimum-phase systems. Nevertheless, the most of physical systems are non-minimum phase. In this paper a new idea will be suggested for decoupling of non-minimum phase systems in which both decoupling process and control system are simplified.

International Journal of Sustainable Energy, 2014

International Journal of Engineering Systems Modelling and Simulation, 2015

ABSTRACT One of the most important features of energy generation sources is robustness of their s... more ABSTRACT One of the most important features of energy generation sources is robustness of their structure against faults. Wind Energy Conversion Systems (WECSs) are generally subjected to occurrence of various faults. Many modelling techniques which have been already introduced for the modelling of the faults or observing the influences of the faults cannot be considered wide-ranging to include any fault at any point of the WECS. On the other hand, for the purpose to explore the impacts of faults on several components of the WECS and probably improving the future design of it, a type of model is required in which mechanical and electrical parts are modelled properly with some details. In this paper, a comprehensive dynamic model for the WECS is presented by which a variety of faults such as sensors, actuators and power grid faults can be studied and effects of these faults on voltage, current and other signals of the WECS can be investigated. In addition, the dynamic model described by this paper can be applied simply to design the fault detection, fault tolerant control and protection systems of the WECS.

Computational Intelligence and Neuroscience, 2014

International Journal of Sustainable Energy, 2014

— یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها د... more — یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها در برابر انواع خطاهاست. سیستم‌های تبدیل انرژی بادی نیز همانند سایر فرآیندها در معرض انواع خطاها قرار دارند. برای بررسی نحوه اثرگذاری خطا بر تمامی اجزای سیستم تبدیل انرژی بادی، نیاز به مدلی است که هم قسمت‌های مکانیکی و هم قسمت‌های الکتریکی را به نحو مناسبی مدل‌ سازی کند. مدل سازی مناسب سیستم تبدیل انرژی بادی، به همراه بررسی دقیق نحوه اثرگذاری خطاها بر آن، می تواند منجر به بهبود طرح‌های آینده در ساخت آن شود. در این تحقیق، یک مدل دینامیکی جامع برای سیستم تبدیل انرژی بادی ارائه می شود که توسط آن می توان انواع خطاها از قبیل خطای سنسورها، محرک‌ها و شبکه قدرت را مورد بررسی قرار داد و اثر آن خطاها را بر سیگنال‌های مختلف سیستم مشاهده نمود. این در حالی است که مدل‌هایی که تاکنون ارائه شده‌اند دارای این ضعف هستند که در آنها نمی‌توان خطاها را در قسمت‌های مختلف سیستم مدل سازی و اثر آن‌ها را در قسمت‌های مختلف سیستم مشاهده نمود. از این مدل می‌توان برای طراحی سیستم‌های تشخیص خطا، کنترل تحمل‌پذیر خطا و مدا...

Computational Intelligence and Neuroscience, 2014

Occurrence of faults in wind energy conversion systems (WECSs) is inevitable. In order to detect ... more Occurrence of faults in wind energy conversion systems (WECSs) is inevitable. In order to detect the occurred faults at the appropriate time, avoid heavy economic losses, ensure safe system operation, prevent damage to adjacent relevant systems, and facilitate timely repair of failed components; a fault detection system (FDS) is required. Recurrent neural networks (RNNs) have gained a noticeable position in FDSs and they have been widely used for modeling of complex dynamical systems. One method for designing an FDS is to prepare a dynamic neural model emulating the normal system behavior. By comparing the outputs of the real system and neural model, incidence of the faults can be identified. In this paper, by utilizing a comprehensive dynamic model which contains both mechanical and electrical components of the WECS, an FDS is suggested using dynamic RNNs. The presented FDS detects faults of the generator's angular velocity sensor, pitch angle sensors, and pitch actuators. Robu...

This paper mainly aims to determine the optimal drug dosage for the purpose of reducing the popul... more This paper mainly aims to determine the optimal drug dosage for the purpose of reducing the population of cancer cells in melanoma patients. To do so, Reinforcement Learning method and the eligibility traces algorithm are employed, giving us the advantage of creating a compromise between the two algorithms of the reinforcement learning, being Monte-Carlo and Temporal Difference. Furthermore, it can be said that using this approach, there was no need to employ a mathematical model in the whole process. However, as its implementation on the real system was not possible, a delayed nonlinear mathematical model is used to investigate the performance of the proposed controller and simulate the behavior of the environment. It should be noted this mathematical model made use of no control method. This is the first time that population control of cancer cells is applied and tested on this model. To know of the optimal dosage of the drug, it should be mentioned that the drug is required to pr...

International Journal of Engineering Systems Modelling and Simulation, 2015

One of the most important features of energy generation sources is robustness of their structure ... more One of the most important features of energy generation sources is robustness of their structure against faults. Wind energy conversion systems (WECSs) are generally subjected to occurrence of various faults. Many modelling techniques which have been already introduced for the modelling of the faults or observing the influences of the faults cannot be considered wide-ranging to include any fault at any point of the WECS. On the other hand, for the purpose to explore the impacts of faults on several components of the WECS and probably improving the future design of it, a type of model is required in which mechanical and electrical parts are modelled properly with some details. In this paper, a comprehensive dynamic model for the WECS is presented by which a variety of faults such as sensors, actuators and power grid faults can be studied and effects of these faults on voltage, current and other signals of the WECS can be investigated. In addition, the dynamic model described by this paper can be applied simply to design the fault detection, fault tolerant control and protection systems of the WECS.

This paper presents a fault tolerant approach for overactuated-oversensed systems subject to mult... more This paper presents a fault tolerant approach for overactuated-oversensed systems subject to multiplicative and additive faults. The main idea is to use a reconciliatory unit in charge to discover online the possibly faulty physical sensors and exclude their measures from the generation of the ”virtual” sensors. In the proposed approach, the energetic based approach has been used to estimate the actuator multiplicative faults. In the next step, an unknown input observer has been coupled with the energetic based estimator to estimate sensor multiplicative and additive faults. Finally, the control allocation approach has been used to reach the desire output. Finally, a simulation example is reported in details to show the effectiveness of the scheme.

— یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها د... more — یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها در برابر انواع خطاهاست. سیستم‌های تبدیل انرژی بادی نیز همانند سایر فرآیندها در معرض انواع خطاها قرار دارند. برای بررسی نحوه اثرگذاری خطا بر تمامی اجزای سیستم تبدیل انرژی بادی، نیاز به مدلی است که هم قسمت‌های مکانیکی و هم قسمت‌های الکتریکی را به نحو مناسبی مدل‌ سازی کند. مدل سازی مناسب سیستم تبدیل انرژی بادی، به همراه بررسی دقیق نحوه اثرگذاری خطاها بر آن، می تواند منجر به بهبود طرح‌های آینده در ساخت آن شود. در این تحقیق، یک مدل دینامیکی جامع برای سیستم تبدیل انرژی بادی ارائه می شود که توسط آن می توان انواع خطاها از قبیل خطای سنسورها، محرک‌ها و شبکه قدرت را مورد بررسی قرار داد و اثر آن خطاها را بر سیگنال‌های مختلف سیستم مشاهده نمود. این در حالی است که مدل‌هایی که تاکنون ارائه شده‌اند دارای این ضعف هستند که در آنها نمی‌توان خطاها را در قسمت‌های مختلف سیستم مدل سازی و اثر آن‌ها را در قسمت‌های مختلف سیستم مشاهده نمود. از این مدل می‌توان برای طراحی سیستم‌های تشخیص خطا، کنترل تحمل‌پذیر خطا و مدا...

Proceedings of the 10th Wseas International Conference on Systems, Jul 10, 2006

Interaction phenomenon in multi-input multi-output (MIMO) systems is an essential difficulty of c... more Interaction phenomenon in multi-input multi-output (MIMO) systems is an essential difficulty of controllers planning. To design the appropriate controller in multivariable systems, the interaction in the system must be measured. The theories for planning decouplers are valid only for minimum-phase systems. Nevertheless, the most of physical systems are non-minimum phase. In this paper a new idea will be suggested for decoupling of non-minimum phase systems in which both decoupling process and control system are simplified.

International Journal of Sustainable Energy, 2014

International Journal of Engineering Systems Modelling and Simulation, 2015

ABSTRACT One of the most important features of energy generation sources is robustness of their s... more ABSTRACT One of the most important features of energy generation sources is robustness of their structure against faults. Wind Energy Conversion Systems (WECSs) are generally subjected to occurrence of various faults. Many modelling techniques which have been already introduced for the modelling of the faults or observing the influences of the faults cannot be considered wide-ranging to include any fault at any point of the WECS. On the other hand, for the purpose to explore the impacts of faults on several components of the WECS and probably improving the future design of it, a type of model is required in which mechanical and electrical parts are modelled properly with some details. In this paper, a comprehensive dynamic model for the WECS is presented by which a variety of faults such as sensors, actuators and power grid faults can be studied and effects of these faults on voltage, current and other signals of the WECS can be investigated. In addition, the dynamic model described by this paper can be applied simply to design the fault detection, fault tolerant control and protection systems of the WECS.

Computational Intelligence and Neuroscience, 2014

International Journal of Sustainable Energy, 2014

— یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها د... more — یکی از مهمترین ویژگی‌هایی که باید برای منابع تولید انرژی در نظر گرفت، مقاوم بودن ساختار آن‌ها در برابر انواع خطاهاست. سیستم‌های تبدیل انرژی بادی نیز همانند سایر فرآیندها در معرض انواع خطاها قرار دارند. برای بررسی نحوه اثرگذاری خطا بر تمامی اجزای سیستم تبدیل انرژی بادی، نیاز به مدلی است که هم قسمت‌های مکانیکی و هم قسمت‌های الکتریکی را به نحو مناسبی مدل‌ سازی کند. مدل سازی مناسب سیستم تبدیل انرژی بادی، به همراه بررسی دقیق نحوه اثرگذاری خطاها بر آن، می تواند منجر به بهبود طرح‌های آینده در ساخت آن شود. در این تحقیق، یک مدل دینامیکی جامع برای سیستم تبدیل انرژی بادی ارائه می شود که توسط آن می توان انواع خطاها از قبیل خطای سنسورها، محرک‌ها و شبکه قدرت را مورد بررسی قرار داد و اثر آن خطاها را بر سیگنال‌های مختلف سیستم مشاهده نمود. این در حالی است که مدل‌هایی که تاکنون ارائه شده‌اند دارای این ضعف هستند که در آنها نمی‌توان خطاها را در قسمت‌های مختلف سیستم مدل سازی و اثر آن‌ها را در قسمت‌های مختلف سیستم مشاهده نمود. از این مدل می‌توان برای طراحی سیستم‌های تشخیص خطا، کنترل تحمل‌پذیر خطا و مدا...