Pub Date : 2014-12-11DOI: 10.1109/CCA.2014.6981621
C. Altafini
A class of continuous-time dynamical systems able to sort a list of real numbers is introduced in this paper. The dynamical sorting is achieved in a completely distributed manner, by modifying a consensus problem, namely right multiplying a Laplacian matrix by a diagonal matrix of weights that represents the desired order. The sorting obtained is relative, i.e., a conservation law is imposed on the dynamics. It is shown that sorting can be achieved in finite-time even in a globally smooth way.
{"title":"A continuous-time dynamical system that can sort agents through distributed protocols","authors":"C. Altafini","doi":"10.1109/CCA.2014.6981621","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981621","url":null,"abstract":"A class of continuous-time dynamical systems able to sort a list of real numbers is introduced in this paper. The dynamical sorting is achieved in a completely distributed manner, by modifying a consensus problem, namely right multiplying a Laplacian matrix by a diagonal matrix of weights that represents the desired order. The sorting obtained is relative, i.e., a conservation law is imposed on the dynamics. It is shown that sorting can be achieved in finite-time even in a globally smooth way.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126067168","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981488
A. Senouci, K. Busawon, A. Bouridane, R. Binns, A. Ouslimani
This paper proposes an observer-based approach for robust chaotic communication with high power plaintext signals. The convergence rate of synchronization can be assigned by appropriately selecting the observer gains. The proposed scheme is carefully designed so that the encrypted signal does not deteriorate the synchronization. The proposed method significantly improves the frequency-domain characteristics of the transmitted secret message. This has the effect of preventing the extraction of the secret message using filtering techniques; hence improved security. Computer simulations show that the synchronization between the transmitter and the receiver is robust for different amplitude values of the information signal even in the presence of external disturbances. The synchronization between the transmitter and the receiver is maintained and the message signal is exactly recovered even for the various types of waveforms (square, trapezoidal, sinusoidal) of plaintext message and while varying the duty cycle and the rising and falling times of the signal.
{"title":"A robust chaotic communication scheme for a class of dynamical systems","authors":"A. Senouci, K. Busawon, A. Bouridane, R. Binns, A. Ouslimani","doi":"10.1109/CCA.2014.6981488","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981488","url":null,"abstract":"This paper proposes an observer-based approach for robust chaotic communication with high power plaintext signals. The convergence rate of synchronization can be assigned by appropriately selecting the observer gains. The proposed scheme is carefully designed so that the encrypted signal does not deteriorate the synchronization. The proposed method significantly improves the frequency-domain characteristics of the transmitted secret message. This has the effect of preventing the extraction of the secret message using filtering techniques; hence improved security. Computer simulations show that the synchronization between the transmitter and the receiver is robust for different amplitude values of the information signal even in the presence of external disturbances. The synchronization between the transmitter and the receiver is maintained and the message signal is exactly recovered even for the various types of waveforms (square, trapezoidal, sinusoidal) of plaintext message and while varying the duty cycle and the rising and falling times of the signal.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123694288","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981597
Sahika Genc, Hullas Sehgal
Installation of an energy management system (EMS) that could minimize the buildings peak load can be impractical, having a long and uncertain return on investment. Identification of building thermal lumped parameters 1) using only zone and supply air temperature measurements for constant- and variable-air volume HVAC equipment, and 2) a distributed algorithm for buildings with large number of zones is discussed for inexpensive thermostatic control retrofits as alternative to traditional supervisory Heat, Ventilation, and Air-Conditioning (HVAC) controller. The challenges in implementation of the proposed approach at two New York State buildings for demonstration and analysis are described: One building which we retrofitted with low-cost off-the-shelf wireless sensors and another building which was recently renovated and fitted with a new HVAC system with the state-of-art supervisory controllers. The differences in simulation-based (e.g., TrnSysTM) analysis and on-site implementation are highlighted. Finally, the results and performance of the proposed distributed estimation algorithm on the actual data from demonstration buildings are provided.
{"title":"Distributed estimation of lumped parameters of multi-zone small-middle size commercial buildings with minimal observations & implementation","authors":"Sahika Genc, Hullas Sehgal","doi":"10.1109/CCA.2014.6981597","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981597","url":null,"abstract":"Installation of an energy management system (EMS) that could minimize the buildings peak load can be impractical, having a long and uncertain return on investment. Identification of building thermal lumped parameters 1) using only zone and supply air temperature measurements for constant- and variable-air volume HVAC equipment, and 2) a distributed algorithm for buildings with large number of zones is discussed for inexpensive thermostatic control retrofits as alternative to traditional supervisory Heat, Ventilation, and Air-Conditioning (HVAC) controller. The challenges in implementation of the proposed approach at two New York State buildings for demonstration and analysis are described: One building which we retrofitted with low-cost off-the-shelf wireless sensors and another building which was recently renovated and fitted with a new HVAC system with the state-of-art supervisory controllers. The differences in simulation-based (e.g., TrnSysTM) analysis and on-site implementation are highlighted. Finally, the results and performance of the proposed distributed estimation algorithm on the actual data from demonstration buildings are provided.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121624426","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981351
P. Hohn, W. Birk
This paper presents a concept for energy optimization dealing with high consistency (HC) refining processes in the pulp and paper industry. Models for the outlet consistency and Gurley number used in the optimization are briefly described. The specific energy is used as manipulated variable. Additionally, the inlet consistency can be adjusted to a fixed value. While keeping the energy consumption as low as possible, it is still attempted to keep outlet consistency and Gurley number close to its desired value. The optimization uses a cost function with quadratic terms. An explicit solution for the optimization problem is derived. Additionally, the results are compared with findings from numerical optimization using a global search algorithm and an interior point method. Results presented are consistent with each other and indicate potential for energy savings.
{"title":"Energy optimization of a high consistency refiner process","authors":"P. Hohn, W. Birk","doi":"10.1109/CCA.2014.6981351","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981351","url":null,"abstract":"This paper presents a concept for energy optimization dealing with high consistency (HC) refining processes in the pulp and paper industry. Models for the outlet consistency and Gurley number used in the optimization are briefly described. The specific energy is used as manipulated variable. Additionally, the inlet consistency can be adjusted to a fixed value. While keeping the energy consumption as low as possible, it is still attempted to keep outlet consistency and Gurley number close to its desired value. The optimization uses a cost function with quadratic terms. An explicit solution for the optimization problem is derived. Additionally, the results are compared with findings from numerical optimization using a global search algorithm and an interior point method. Results presented are consistent with each other and indicate potential for energy savings.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124713465","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981367
Mikiya Yoshida, K. Nonaka, K. Sekiguchi
In this paper, we propose a robust model predictive vehicle control with restriction of wheel side-slip angle. The proposed method confines the wheel side slip angle to the range of small value in order to linearize the force model and to avoid tire force saturation which strongly depends on the tire-road coefficient of friction. The linearization greatly helps to improve the computational speed on model predictive control. To cope with both the linearization error and the influence of uncertainty of road surface condition, we introduce sliding mode control and suppress the disturbance due to them. The effectiveness of the proposed method is verified by comparative simulations.
{"title":"Model predictive vehicle control with side slip angle restriction with suppression of modeling error by sliding mode control","authors":"Mikiya Yoshida, K. Nonaka, K. Sekiguchi","doi":"10.1109/CCA.2014.6981367","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981367","url":null,"abstract":"In this paper, we propose a robust model predictive vehicle control with restriction of wheel side-slip angle. The proposed method confines the wheel side slip angle to the range of small value in order to linearize the force model and to avoid tire force saturation which strongly depends on the tire-road coefficient of friction. The linearization greatly helps to improve the computational speed on model predictive control. To cope with both the linearization error and the influence of uncertainty of road surface condition, we introduce sliding mode control and suppress the disturbance due to them. The effectiveness of the proposed method is verified by comparative simulations.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124721617","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981386
J. Antonioli, A. Taghizad, T. Rakotomamonjy, M. Ouladsine
Helicopters are naturally (say without piloting assistance) unstable: autopilots have been introduced by industrials to assist in the piloting task. Designers have to tune the associated controllers in order to handle at best requirements from the aeronautical design standard 33. Due to the specificity of the control laws and the requirements, no analytical method exists to analyze the tuning of such controllers. In this paper, we expose analytical developments that can be used to initialize the gains of these kinds of controls laws taking into account requirements from ADS-33 standards, using simplified closed loop linear models. Results are exposed and discussed compared to complete closed loop linear results.
{"title":"Development of flying qualities based charts as a support for the initialization of the gains of helicopter control laws","authors":"J. Antonioli, A. Taghizad, T. Rakotomamonjy, M. Ouladsine","doi":"10.1109/CCA.2014.6981386","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981386","url":null,"abstract":"Helicopters are naturally (say without piloting assistance) unstable: autopilots have been introduced by industrials to assist in the piloting task. Designers have to tune the associated controllers in order to handle at best requirements from the aeronautical design standard 33. Due to the specificity of the control laws and the requirements, no analytical method exists to analyze the tuning of such controllers. In this paper, we expose analytical developments that can be used to initialize the gains of these kinds of controls laws taking into account requirements from ADS-33 standards, using simplified closed loop linear models. Results are exposed and discussed compared to complete closed loop linear results.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122243714","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981586
Hao Sun, Thomas Meinlschmidt, H. Aschemann
A decentralised approach is proposed in this paper for an optimal tracking control (OTC) of a hydrostatic transmission, which is commonly used in working machines. An unknown leakage volume flow and a resulting load torque have been taken into account as lumped disturbances. Together with unmeasurable system states, the normalised swashplate and the normalised bent axis angles, the proposed controller is extended by a nonlinear observer and a corresponding disturbance compensation. Thereby, the high tracking accuracy can be achieved for the normalised bent axis angle and the angular velocity of the motor as controlled variables. The efficiency of the proposed controllers is demonstrated by both simulations and experiments.
{"title":"Optimal tracking control with observer-based disturbance compensation for a hydrostatic transmission","authors":"Hao Sun, Thomas Meinlschmidt, H. Aschemann","doi":"10.1109/CCA.2014.6981586","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981586","url":null,"abstract":"A decentralised approach is proposed in this paper for an optimal tracking control (OTC) of a hydrostatic transmission, which is commonly used in working machines. An unknown leakage volume flow and a resulting load torque have been taken into account as lumped disturbances. Together with unmeasurable system states, the normalised swashplate and the normalised bent axis angles, the proposed controller is extended by a nonlinear observer and a corresponding disturbance compensation. Thereby, the high tracking accuracy can be achieved for the normalised bent axis angle and the angular velocity of the motor as controlled variables. The efficiency of the proposed controllers is demonstrated by both simulations and experiments.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129892927","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981328
Diana Hernandez-Alcantara, J. Tudón-Martínez, L. Amezquita-Brooks, C. Vivas-Lopez, R. Morales-Menéndez
Semi-active suspension systems aim to improve the stability and comfort of vehicles. Several semi-active suspension control strategies require the vertical velocities; however, the instrumentation of the vehicle normally does not include sensors for these variables, typically only accelerometers are available. Direct integration to estimate the vertical-velocities fails to provide accurate velocity estimations. In particular, the dependency of the system on the road profile, which is an unknown signal, complicates the use of traditional observer schemes. In addition, the behavior of semi-active dampers is highly nonlinear. Two estimation strategies are proposed: an Unknown Input Observer (UIO) and a Robust H∞ Observer. During the design of the UIO the unknown road profile decoupling induces observability problems, which are overcome with an approximated observer. An experimental comparison between the estimation methods in common perturbation conditions is carried out. The experimental results, obtained with a 5:1 scale car equipped with ER dampers, show that it is possible to archive good estimation performance with the proposed schemes.
{"title":"State observers for semi-active suspensions: Experimental results","authors":"Diana Hernandez-Alcantara, J. Tudón-Martínez, L. Amezquita-Brooks, C. Vivas-Lopez, R. Morales-Menéndez","doi":"10.1109/CCA.2014.6981328","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981328","url":null,"abstract":"Semi-active suspension systems aim to improve the stability and comfort of vehicles. Several semi-active suspension control strategies require the vertical velocities; however, the instrumentation of the vehicle normally does not include sensors for these variables, typically only accelerometers are available. Direct integration to estimate the vertical-velocities fails to provide accurate velocity estimations. In particular, the dependency of the system on the road profile, which is an unknown signal, complicates the use of traditional observer schemes. In addition, the behavior of semi-active dampers is highly nonlinear. Two estimation strategies are proposed: an Unknown Input Observer (UIO) and a Robust H∞ Observer. During the design of the UIO the unknown road profile decoupling induces observability problems, which are overcome with an approximated observer. An experimental comparison between the estimation methods in common perturbation conditions is carried out. The experimental results, obtained with a 5:1 scale car equipped with ER dampers, show that it is possible to archive good estimation performance with the proposed schemes.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128858707","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981445
A. Bonfiglio, S. Bracco, M. Brignone, F. Delfino, F. Pampararo, R. Procopio, M. Robba, M. Rossi
An approach based on a receding-horizon control scheme is here proposed for the optimal control of active and reactive power flows in microgrids (an aggregation of distributed energy resources (DER) of small size (such as photovoltaics, wind generation, cogeneration units - CHP, concentrated solar power - CSP, mini-hydro, energy storage)). Microgrids represent today one of the most promising technology for DERs integration, as they can alleviate management and monitoring burden for the Distribution System Operator (DSO) by clustering several DERs in a single entity which interacts with the grid as a single source. The formalized decision model is applied to an innovative test-bed facility (the University of Genova Smart Polygeneration Microgrid).
{"title":"A receding-horizon approach for active and reactive power flows optimization in microgrids","authors":"A. Bonfiglio, S. Bracco, M. Brignone, F. Delfino, F. Pampararo, R. Procopio, M. Robba, M. Rossi","doi":"10.1109/CCA.2014.6981445","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981445","url":null,"abstract":"An approach based on a receding-horizon control scheme is here proposed for the optimal control of active and reactive power flows in microgrids (an aggregation of distributed energy resources (DER) of small size (such as photovoltaics, wind generation, cogeneration units - CHP, concentrated solar power - CSP, mini-hydro, energy storage)). Microgrids represent today one of the most promising technology for DERs integration, as they can alleviate management and monitoring burden for the Distribution System Operator (DSO) by clustering several DERs in a single entity which interacts with the grid as a single source. The formalized decision model is applied to an innovative test-bed facility (the University of Genova Smart Polygeneration Microgrid).","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134007465","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 : 2014-12-11DOI: 10.1109/CCA.2014.6981542
Paul Glotfelter, T. Eichelberger, Patrick J. Martin
This paper presents a cloud-computing inspired framework that facilitates the programming of a deployed cyber-physical system. This framework, PhysiCloud, uses a novel combination of abstractions that hide the implementation details of the underlying cyber-physical system. Additionally, the framework is designed to operate on low-power, mobile systems with resiliency to network failures. Using this system, a controls application developer can focus on their algorithm development and its information dependencies, rather than issues of low level scheduling and communication.
{"title":"PhysiCloud: A cloud-computing framework for programming cyber-physical systems","authors":"Paul Glotfelter, T. Eichelberger, Patrick J. Martin","doi":"10.1109/CCA.2014.6981542","DOIUrl":"https://doi.org/10.1109/CCA.2014.6981542","url":null,"abstract":"This paper presents a cloud-computing inspired framework that facilitates the programming of a deployed cyber-physical system. This framework, PhysiCloud, uses a novel combination of abstractions that hide the implementation details of the underlying cyber-physical system. Additionally, the framework is designed to operate on low-power, mobile systems with resiliency to network failures. Using this system, a controls application developer can focus on their algorithm development and its information dependencies, rather than issues of low level scheduling and communication.","PeriodicalId":205599,"journal":{"name":"2014 IEEE Conference on Control Applications (CCA)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134105116","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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