Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154639
J. Hervas, M. Reyhanoglu, W. MacKunis
Observer-based feedback control of self-excited combustion oscillations in a Rijke-type thermoacoustic system is considered. A commonly used thermoacoustic model with a number of sensors and distributed monopole-like actuators is first introduced. The model is formulated as a linear time-delay system. It is shown that the velocity or pressure sensor locations can be chosen to assure the observability of the system. An observer-based sliding mode controller is then implemented to tune the actuators so that the system is asymptotically stable. The effectiveness of the controller is illustrated through a simulation example involving two modes.
{"title":"Sliding mode control of Rijke-type thermoacoustic systems","authors":"J. Hervas, M. Reyhanoglu, W. MacKunis","doi":"10.1109/RASM.2015.7154639","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154639","url":null,"abstract":"Observer-based feedback control of self-excited combustion oscillations in a Rijke-type thermoacoustic system is considered. A commonly used thermoacoustic model with a number of sensors and distributed monopole-like actuators is first introduced. The model is formulated as a linear time-delay system. It is shown that the velocity or pressure sensor locations can be chosen to assure the observability of the system. An observer-based sliding mode controller is then implemented to tune the actuators so that the system is asymptotically stable. The effectiveness of the controller is illustrated through a simulation example involving two modes.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"17 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114024410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154586
B. Veselić, B. Drazenovic, C. Milosavljevic
This paper proposes a design method of the discrete-time integral sliding manifold that minimizes linear systems sensitivity to unmatched constant or slowly-varying external disturbances. The impact of unmatched disturbances is evaluated by a steady-state dependent quadratic criterion. An efficient design procedure is derived that easily finds the optimal sliding manifold that minimizes a criterion in discrete-time integral sliding mode control system. The suggested approach has been verified on numerical examples and computer simulations.
{"title":"Optimal discrete-time integral sliding manifold design for linear systems subjected to a class of unmatched disturbances","authors":"B. Veselić, B. Drazenovic, C. Milosavljevic","doi":"10.1109/RASM.2015.7154586","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154586","url":null,"abstract":"This paper proposes a design method of the discrete-time integral sliding manifold that minimizes linear systems sensitivity to unmatched constant or slowly-varying external disturbances. The impact of unmatched disturbances is evaluated by a steady-state dependent quadratic criterion. An efficient design procedure is derived that easily finds the optimal sliding manifold that minimizes a criterion in discrete-time integral sliding mode control system. The suggested approach has been verified on numerical examples and computer simulations.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129149992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154650
Amal Al-Wedami, K. Al-Hosani, A. R. Beig
Modular Multilevel Converter (MMC) has attracted the attention of researchers particularly those working in the area of transformer-less medium to high power conversion. This topology has adopted several interesting operational characteristics such as modularity, voltage scalability, multilevel waveform capability, safe failure management, redundancy and high reliability. MMC consists of cascaded connection of multiple, identical and individually controlled bidirectional half-bridge sub modules with floating DC capacitors. A significant aspect of MMC operation is maintaining the total sum of capacitor voltages of the sub modules per arm equal to the input DC bus voltage and ensuring equal voltage sharing among the submodules. In this paper, sliding mode observer is introduced to complement a Phase shifted Pulse Width Modulation based capacitor voltage balancing controller for a three-level MMC. Also, the mathematical model of MMC, voltage balancing control algorithm, and sliding mode submodular capacitor voltage observer are included in this paper. Finally, the proposed observer design is verified through computer simulation.
{"title":"Sliding mode observer of submodular capacitor voltages in Modular Multilevel Converter","authors":"Amal Al-Wedami, K. Al-Hosani, A. R. Beig","doi":"10.1109/RASM.2015.7154650","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154650","url":null,"abstract":"Modular Multilevel Converter (MMC) has attracted the attention of researchers particularly those working in the area of transformer-less medium to high power conversion. This topology has adopted several interesting operational characteristics such as modularity, voltage scalability, multilevel waveform capability, safe failure management, redundancy and high reliability. MMC consists of cascaded connection of multiple, identical and individually controlled bidirectional half-bridge sub modules with floating DC capacitors. A significant aspect of MMC operation is maintaining the total sum of capacitor voltages of the sub modules per arm equal to the input DC bus voltage and ensuring equal voltage sharing among the submodules. In this paper, sliding mode observer is introduced to complement a Phase shifted Pulse Width Modulation based capacitor voltage balancing controller for a three-level MMC. Also, the mathematical model of MMC, voltage balancing control algorithm, and sliding mode submodular capacitor voltage observer are included in this paper. Finally, the proposed observer design is verified through computer simulation.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116162141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154646
S. Kamal, A. Chalanga, K. P. Ramesh, B. Bandyopadhyay
This paper proposes multivariable integral sliding mode controller for any Multi Input Multi Output (MIMO) system. The conventional integral sliding mode controller consists of a nominal control and a discontinuous feedback control such that the overall control is discontinuous in nature. The discontinuity in feedback control is undesirable for practical applications due to chattering. In this paper the existing integral sliding mode control law for MIMO systems with matched disturbances is modified by replacing the discontinuous part by a multivariable super twisting algorithm. This proposed controller is continuous in nature due to the combinations of two continuous controls and also disturbance can be rejected successfully. The effectiveness of the proposed control method has been demonstrated with the simulation results.
{"title":"Multivariable continuous integral sliding mode control","authors":"S. Kamal, A. Chalanga, K. P. Ramesh, B. Bandyopadhyay","doi":"10.1109/RASM.2015.7154646","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154646","url":null,"abstract":"This paper proposes multivariable integral sliding mode controller for any Multi Input Multi Output (MIMO) system. The conventional integral sliding mode controller consists of a nominal control and a discontinuous feedback control such that the overall control is discontinuous in nature. The discontinuity in feedback control is undesirable for practical applications due to chattering. In this paper the existing integral sliding mode control law for MIMO systems with matched disturbances is modified by replacing the discontinuous part by a multivariable super twisting algorithm. This proposed controller is continuous in nature due to the combinations of two continuous controls and also disturbance can be rejected successfully. The effectiveness of the proposed control method has been demonstrated with the simulation results.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124774896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154643
G. Fadda, A. Pilloni, A. Pisano, E. Usai, A. Marjanović, S. Vujnovic
This work deals with the problem of model-based sensor FDI in water-steam power plants where, due to extreme pressure and temperature conditions, measurement sensors are prone to failures. Faults in the measurement devices of output variables (water flow and level) and of input variable (steam flow) are considered. When both the output and input measurements are subject to faults it is hard to detect and estimate them. To overcome this limitation and achieve FDI, we propose to use a sliding mode observer (SMO) and to make an appropriate signature analysis on the resulting output injection terms in order to identify a “distinguishing” signature for each fault. The performance of the proposed scheme has been evaluated off-line using real-data taken from the TEKO B1 Thermal Power Plant of Kostolac (Serbia) whose nominal power is 330 MW.
{"title":"Sensor fault diagnosis in water-steam power plant: A combined observer-based/pattern-recognition approach","authors":"G. Fadda, A. Pilloni, A. Pisano, E. Usai, A. Marjanović, S. Vujnovic","doi":"10.1109/RASM.2015.7154643","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154643","url":null,"abstract":"This work deals with the problem of model-based sensor FDI in water-steam power plants where, due to extreme pressure and temperature conditions, measurement sensors are prone to failures. Faults in the measurement devices of output variables (water flow and level) and of input variable (steam flow) are considered. When both the output and input measurements are subject to faults it is hard to detect and estimate them. To overcome this limitation and achieve FDI, we propose to use a sliding mode observer (SMO) and to make an appropriate signature analysis on the resulting output injection terms in order to identify a “distinguishing” signature for each fault. The performance of the proposed scheme has been evaluated off-line using real-data taken from the TEKO B1 Thermal Power Plant of Kostolac (Serbia) whose nominal power is 330 MW.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"22 23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116554507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154655
Y. Parali, E. M. Jafarov
In this work higher order sliding mode autopilots are designed for highly maneuverable nonminimum phase missile system. Nonminimum phase nature of tail controlled missiles prevents direct implementation of sliding mode control algorithms. To overcome this difficulty an output redefinition technique is developed. Then higher order sliding mode control algorithms used for autopilot design. Second and third order SMC algorithms are tried on missile system that ideally has relative degree of two. It is showed that parasitic input-output dynamics that have lower relative degree than ideal input-output dynamics have disruptive effect on control performance. Solution is found by increasing of order of the controller and generating control signal as derivative of input. Finally adaptation schemes are applied to control algorithms to reduce chattering and increase convergence rate. Results of numerical simulation runs are given to show the effectiveness of the proposed control applications.
{"title":"Higher order sliding mode control applications with output redefinition for nonminimum phase missile system","authors":"Y. Parali, E. M. Jafarov","doi":"10.1109/RASM.2015.7154655","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154655","url":null,"abstract":"In this work higher order sliding mode autopilots are designed for highly maneuverable nonminimum phase missile system. Nonminimum phase nature of tail controlled missiles prevents direct implementation of sliding mode control algorithms. To overcome this difficulty an output redefinition technique is developed. Then higher order sliding mode control algorithms used for autopilot design. Second and third order SMC algorithms are tried on missile system that ideally has relative degree of two. It is showed that parasitic input-output dynamics that have lower relative degree than ideal input-output dynamics have disruptive effect on control performance. Solution is found by increasing of order of the controller and generating control signal as derivative of input. Finally adaptation schemes are applied to control algorithms to reduce chattering and increase convergence rate. Results of numerical simulation runs are given to show the effectiveness of the proposed control applications.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"505 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133053681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154645
A. Popov, B. Andrievsky, I. Zaitceva
The paper is devoted to application of sliding mode control technique for stabilization of a planar vertical take-off and landing aircraft. Lateral motion of the autonomous aircraft is considered, containing two planar coordinates of the aircraft center of gravity and one angular coordinate for aircraft attitude. To verify the theoretical statements, simulations in Matlab/Simulink environment have been carried out. The cases of varying degrees of the control channels interference, parametric perturbations, external disturbances as the sums of harmonic signals, and unmodeled dynamics have been studied by a simulation. The case of aircraft control without output signals derivatives measurement was examined. For differentiation, the super-twisting algorithms have been employed. The results obtained show a good system performance.
{"title":"Stabilization of PVTOL aircraft by supertwisting algorithms","authors":"A. Popov, B. Andrievsky, I. Zaitceva","doi":"10.1109/RASM.2015.7154645","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154645","url":null,"abstract":"The paper is devoted to application of sliding mode control technique for stabilization of a planar vertical take-off and landing aircraft. Lateral motion of the autonomous aircraft is considered, containing two planar coordinates of the aircraft center of gravity and one angular coordinate for aircraft attitude. To verify the theoretical statements, simulations in Matlab/Simulink environment have been carried out. The cases of varying degrees of the control channels interference, parametric perturbations, external disturbances as the sums of harmonic signals, and unmodeled dynamics have been studied by a simulation. The case of aircraft control without output signals derivatives measurement was examined. For differentiation, the super-twisting algorithms have been employed. The results obtained show a good system performance.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124580674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154653
Xiang Hu, D. Al-Ani, S. Habibi
In any type of system, unexpected fault conditions may occur. A minor fault may cause the system efficiency and performance to deviate from norm and/or deteriorate; a major fault condition may cause a system failure. Fault detection and diagnosis (FDD) and fault tolerance are two important concepts that need to be considered in industrial applications and more specifically in safety critical systems. This paper considers the development of a fault tolerant sliding mode control (SMC) strategy for a form of hydraulic actuation system known as the Electro-Hydrostatic Actuator (EHA). EHA systems are being increasingly used in flight control applications. An EHA prototype is used for demonstrating the effectiveness of the proposed fault tolerant control strategy.
{"title":"A new Sliding Mode Controller for Electro-Hydraulic Actuator (EHA) applications","authors":"Xiang Hu, D. Al-Ani, S. Habibi","doi":"10.1109/RASM.2015.7154653","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154653","url":null,"abstract":"In any type of system, unexpected fault conditions may occur. A minor fault may cause the system efficiency and performance to deviate from norm and/or deteriorate; a major fault condition may cause a system failure. Fault detection and diagnosis (FDD) and fault tolerance are two important concepts that need to be considered in industrial applications and more specifically in safety critical systems. This paper considers the development of a fault tolerant sliding mode control (SMC) strategy for a form of hydraulic actuation system known as the Electro-Hydrostatic Actuator (EHA). EHA systems are being increasingly used in flight control applications. An EHA prototype is used for demonstrating the effectiveness of the proposed fault tolerant control strategy.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131571503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154640
Satnesh Singh, S. Janardhanan
In this paper, the problem of stochastic variable structure control (SVSC) systems with bounded disturbances is considered and the corresponding SVSC strategies with complete and incomplete state information in presence of bounded disturbances is established. By using the Kalman filter, we are estimating the incomplete state information. Also, stability analysis of bounded disturbances is established. A simulation example is provided to demonstrate the usefulness of the proposed design method.
{"title":"Stochastic variable structure control of discrete time LTI systems with bounded disturbances","authors":"Satnesh Singh, S. Janardhanan","doi":"10.1109/RASM.2015.7154640","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154640","url":null,"abstract":"In this paper, the problem of stochastic variable structure control (SVSC) systems with bounded disturbances is considered and the corresponding SVSC strategies with complete and incomplete state information in presence of bounded disturbances is established. By using the Kalman filter, we are estimating the incomplete state information. Also, stability analysis of bounded disturbances is established. A simulation example is provided to demonstrate the usefulness of the proposed design method.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115916096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-09DOI: 10.1109/RASM.2015.7154581
K. Veluvolu, J. Rath, M. Defoort, Y. Soh
The estimation of vehicle side slip and road bank angle is a significant issue in automotive research. In this work, to solve the state and unknown inputs estimation problem for the nonlinear vehicle dynamics, a high-gain observer in combination with higher-order sliding mode observer is employed. The high-gain observer is designed to overcome the parametric uncertainties and the higher-order sliding mode observer is employed for smooth estimation of unknown inputs. The combined observer does not impose the small-Lipschitz-constant condition on the system nonlinearity. Simulation results demonstrate the effectiveness of the proposed observer for estimation of the vehicle side slip and the road bank angle.
{"title":"Estimation of side slip and road bank angle using high-gain observer and higher-order sliding mode observer","authors":"K. Veluvolu, J. Rath, M. Defoort, Y. Soh","doi":"10.1109/RASM.2015.7154581","DOIUrl":"https://doi.org/10.1109/RASM.2015.7154581","url":null,"abstract":"The estimation of vehicle side slip and road bank angle is a significant issue in automotive research. In this work, to solve the state and unknown inputs estimation problem for the nonlinear vehicle dynamics, a high-gain observer in combination with higher-order sliding mode observer is employed. The high-gain observer is designed to overcome the parametric uncertainties and the higher-order sliding mode observer is employed for smooth estimation of unknown inputs. The combined observer does not impose the small-Lipschitz-constant condition on the system nonlinearity. Simulation results demonstrate the effectiveness of the proposed observer for estimation of the vehicle side slip and the road bank angle.","PeriodicalId":297041,"journal":{"name":"2015 International Workshop on Recent Advances in Sliding Modes (RASM)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124835295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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