Pub Date : 2011-06-26DOI: 10.1109/ICMIC.2011.5973700
C. Abeykoon, Kang Li, P. Martin, A. Kelly
Melt pressure is one of the most important process parameters in polymer extrusion and it is also closely related to the product quality. However, it is not directly controllable and is affected in a complex manner by changing other process operating conditions such as screw rotation speed and set temperatures. The ability to predict such parameter would be a powerful tool to aid process design and optimisation. However, only a few practical process models are available to predict the melt pressure based on process settings in polymer extrusion. This paper describes new nonlinear static and linear dynamic models which have been developed to explore the effects of process settings and screw geometry on melt pressure development in single screw extrusion. A computationally efficient linear-in-the-parameters modelling technique was used in model development and the resultant models show satisfactory performance in predicting the melt pressure with good accuracy over a wide operating window.
{"title":"Modelling of melt pressure development in polymer extrusion: Effects of process settings and screw geometry","authors":"C. Abeykoon, Kang Li, P. Martin, A. Kelly","doi":"10.1109/ICMIC.2011.5973700","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973700","url":null,"abstract":"Melt pressure is one of the most important process parameters in polymer extrusion and it is also closely related to the product quality. However, it is not directly controllable and is affected in a complex manner by changing other process operating conditions such as screw rotation speed and set temperatures. The ability to predict such parameter would be a powerful tool to aid process design and optimisation. However, only a few practical process models are available to predict the melt pressure based on process settings in polymer extrusion. This paper describes new nonlinear static and linear dynamic models which have been developed to explore the effects of process settings and screw geometry on melt pressure development in single screw extrusion. A computationally efficient linear-in-the-parameters modelling technique was used in model development and the resultant models show satisfactory performance in predicting the melt pressure with good accuracy over a wide operating window.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123881511","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973755
Z. A. Kadir, K. Hudha, H. Jamaluddin, F. Ahmad, F. Imaduddin
This paper presents the roll moment rejection control of pneumatically actuated active roll control (ARC) suspension system for a passenger vehicle. The controller consists of the two controller loops namely inner loop controller to cancel out the unwanted weight transfer and outer loop controller to suppress both body vertical displacement and body roll angle using Fuzzy Logic Control. Two types of vehicle dynamics test are performed by simulation for the purposed control structure namely step steer test and double lane change test. The results of simulation show that the ARC system is able to significantly improve the dynamic performance of the vehicle compared with the passive system such as body roll angle, body roll rate, body vertical acceleration and body vertical displacement.
{"title":"Active roll control suspension system for improving dynamics performance of passenger vehicle","authors":"Z. A. Kadir, K. Hudha, H. Jamaluddin, F. Ahmad, F. Imaduddin","doi":"10.1109/ICMIC.2011.5973755","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973755","url":null,"abstract":"This paper presents the roll moment rejection control of pneumatically actuated active roll control (ARC) suspension system for a passenger vehicle. The controller consists of the two controller loops namely inner loop controller to cancel out the unwanted weight transfer and outer loop controller to suppress both body vertical displacement and body roll angle using Fuzzy Logic Control. Two types of vehicle dynamics test are performed by simulation for the purposed control structure namely step steer test and double lane change test. The results of simulation show that the ARC system is able to significantly improve the dynamic performance of the vehicle compared with the passive system such as body roll angle, body roll rate, body vertical acceleration and body vertical displacement.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122909407","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973669
Y. Shao, Zhenzhou Wang, Yuming Zhang
In the laser enhanced gas metal arc welding (GMAW) process developed recently, droplets of melted metal can be detached from the wire under relatively low currents with the assistance of an auxiliary force provided by a laser. The stability and the arc and the quality of the resultant welds are improved. To compete with the gas tungsten arc welding (GTAW) of the much lower productivity in joining precision, the size of the droplet can be pre-defined and be controlled to meet the requirements from different applications. For this purpose, image processing algorithms are developed to measure the size of a growing droplet during the laser enhanced GMAW process. The relatively low contrast, strong illumination and reflection caused by the laser, and strong radiation from the arc make an automatic processing of the image challenging. Images are analyzed to understand its characteristics and design the image processing and recognition algorithms accordingly. In particular, a model based method is used to filter out non-droplet edge points and a second order equation in the polar coordinate system is introduced to model the droplet. Experimental results verified the effectiveness of the developed algorithms.
{"title":"Droplet measurement in laser enhanced GMAW","authors":"Y. Shao, Zhenzhou Wang, Yuming Zhang","doi":"10.1109/ICMIC.2011.5973669","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973669","url":null,"abstract":"In the laser enhanced gas metal arc welding (GMAW) process developed recently, droplets of melted metal can be detached from the wire under relatively low currents with the assistance of an auxiliary force provided by a laser. The stability and the arc and the quality of the resultant welds are improved. To compete with the gas tungsten arc welding (GTAW) of the much lower productivity in joining precision, the size of the droplet can be pre-defined and be controlled to meet the requirements from different applications. For this purpose, image processing algorithms are developed to measure the size of a growing droplet during the laser enhanced GMAW process. The relatively low contrast, strong illumination and reflection caused by the laser, and strong radiation from the arc make an automatic processing of the image challenging. Images are analyzed to understand its characteristics and design the image processing and recognition algorithms accordingly. In particular, a model based method is used to filter out non-droplet edge points and a second order equation in the polar coordinate system is introduced to model the droplet. Experimental results verified the effectiveness of the developed algorithms.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116528458","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973707
Yu-Sheng Lu, Hua Chiu, S. Lien
This paper investigates the design and control of a novel inverted pendulum. First, the structure of the inverted pendulum is presented, and its mathematical model is derived using Euler-Lagrange's equations. Using a transformed model, a nonlinear control scheme is applied to this new inverted pendulum. The non-linear control scheme is based on the well-known backstepping design approach to obtain a nonlinear controller that is suitable for both regulation and tracking tasks. Furthermore, the control scheme is practically implemented and compared in this inverted pendulum system in order to investigate its effectiveness.
{"title":"Practical design and control of a novel inverted pendulum","authors":"Yu-Sheng Lu, Hua Chiu, S. Lien","doi":"10.1109/ICMIC.2011.5973707","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973707","url":null,"abstract":"This paper investigates the design and control of a novel inverted pendulum. First, the structure of the inverted pendulum is presented, and its mathematical model is derived using Euler-Lagrange's equations. Using a transformed model, a nonlinear control scheme is applied to this new inverted pendulum. The non-linear control scheme is based on the well-known backstepping design approach to obtain a nonlinear controller that is suitable for both regulation and tracking tasks. Furthermore, the control scheme is practically implemented and compared in this inverted pendulum system in order to investigate its effectiveness.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131808778","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973697
Zhao Min, Li Shaoyuan
A feedback control law is derived analytically for a linear parameter varying (LPV) discrete-time system with bounded rates of parameter variations subject to input-saturated constraints in this paper. As the uncertain region of such a LPV system in the future changes corresponding to the parameters which can be predicted in the future stage due to the information on the parameters value, magnitude bounds and the variation rate bounds, the control law is presented in the paper by solving a min-max MPC problem based on a dynamic programming viewpoint. By exploiting the dynamic nature of the min-max optimal problem and showing the convexity of the dynamic cost-to-go, the intrinsic structure of the feedback control law has been obtained which is proved to be efficient for an LPV system with bounded rates of parameter variations by an example at last.
{"title":"Solution of min-max optimization problem for LPV systems via dynamic programming","authors":"Zhao Min, Li Shaoyuan","doi":"10.1109/ICMIC.2011.5973697","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973697","url":null,"abstract":"A feedback control law is derived analytically for a linear parameter varying (LPV) discrete-time system with bounded rates of parameter variations subject to input-saturated constraints in this paper. As the uncertain region of such a LPV system in the future changes corresponding to the parameters which can be predicted in the future stage due to the information on the parameters value, magnitude bounds and the variation rate bounds, the control law is presented in the paper by solving a min-max MPC problem based on a dynamic programming viewpoint. By exploiting the dynamic nature of the min-max optimal problem and showing the convexity of the dynamic cost-to-go, the intrinsic structure of the feedback control law has been obtained which is proved to be efficient for an LPV system with bounded rates of parameter variations by an example at last.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134317941","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973742
Li-hui Cen, Yu-geng Xi, Dewci Li
This paper deals with the regulation of water flow in an open channel with arbitrary cross sections modeled by the nonlinear Saint-Venant equations. The characteristic form of the Saint-Venant initial-boundary value problem is established in terms of Riemann invariants. In order to develop the boundary control laws for a canal with arbitrary cross sections, a general boundary control design approach is proposed. The simplest boundary conditions are presented to satisfy the stability conditions. According to these boundary conditions, a set of boundary feedback controls is deduced for a canal with arbitrary cross sections and with various control gates. Finally, a canal with several typical types of cross sections is studied.
{"title":"A general boundary feedback control design for an open canal","authors":"Li-hui Cen, Yu-geng Xi, Dewci Li","doi":"10.1109/ICMIC.2011.5973742","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973742","url":null,"abstract":"This paper deals with the regulation of water flow in an open channel with arbitrary cross sections modeled by the nonlinear Saint-Venant equations. The characteristic form of the Saint-Venant initial-boundary value problem is established in terms of Riemann invariants. In order to develop the boundary control laws for a canal with arbitrary cross sections, a general boundary control design approach is proposed. The simplest boundary conditions are presented to satisfy the stability conditions. According to these boundary conditions, a set of boundary feedback controls is deduced for a canal with arbitrary cross sections and with various control gates. Finally, a canal with several typical types of cross sections is studied.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133155775","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973723
Q. Ding, Wei Fang
In this paper a polar-coordinate mathematical model of suspension force of bearingless permanent magnet motor is derived based on traditional suspension force model. Combined with space vector pulse with modulation algorithm, the direct suspension displacement control is proposed depending on the polar-coordinate mathematical model and the suspension current closed-loop control is omitted using the proposed control strategy. So the suspension control is simplified. The simulation results show the proposed control strategy can enhance system dynamic performance and achieve stable suspension under rated work condition.
{"title":"Direct suspension displacement control for bearingless permanent magnet motors","authors":"Q. Ding, Wei Fang","doi":"10.1109/ICMIC.2011.5973723","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973723","url":null,"abstract":"In this paper a polar-coordinate mathematical model of suspension force of bearingless permanent magnet motor is derived based on traditional suspension force model. Combined with space vector pulse with modulation algorithm, the direct suspension displacement control is proposed depending on the polar-coordinate mathematical model and the suspension current closed-loop control is omitted using the proposed control strategy. So the suspension control is simplified. The simulation results show the proposed control strategy can enhance system dynamic performance and achieve stable suspension under rated work condition.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115344619","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973735
Wenbo Na
The nitrifying process is an important step in dinitrochlorobenzene production. This paper presented an optimization control system to implement the modeling, optimization, and control of the nitrifying process. Models for predicting the quality of nitrifying process are derived and implemented using improved back-propagation neural networks, and an algorithm combining c-means clustering, genetic, and chaos approaches for the optimization of the operating parameters of the nitrifying process is presented. The results of actual runs demonstrate the validity of the system.
{"title":"Optimization control system for nitrifying process","authors":"Wenbo Na","doi":"10.1109/ICMIC.2011.5973735","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973735","url":null,"abstract":"The nitrifying process is an important step in dinitrochlorobenzene production. This paper presented an optimization control system to implement the modeling, optimization, and control of the nitrifying process. Models for predicting the quality of nitrifying process are derived and implemented using improved back-propagation neural networks, and an algorithm combining c-means clustering, genetic, and chaos approaches for the optimization of the operating parameters of the nitrifying process is presented. The results of actual runs demonstrate the validity of the system.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114813101","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 : 2011-06-26DOI: 10.1109/ICMIC.2011.5973756
Yue Ma, C. Xiang, Quanmin Zhu, Q. Yan, A. Winfield
In this paper, stabilizing control of tracked mobile robot in 3-D space was presented. Firstly, models of major modules of TMR were established. Next, to reveal the mechanism of disturbances applied on TMR, two kinds of representative disturbances (slope and general disturbances in yaw motion) were discussed in depth. Consequently, an attempting PID method was employed to compensate the impacts of disturbances and simulation results proved the validity for disturbance incited by slope force, but revealed the lack for general disturbance on yaw motion. Finally, a hierarchical fuzzy controller combined with PID controller was pro posed. In lower level, there were two PID controllers t o compensate the disturbance of slope force, and on top level, the fuzzy logic controller was employed to correct the yaw motion error based on the differences between the model and the real TMR, which was able to guide the TMR maintain on the stable state. Simulation results demonstrated the excellent effectiveness of the newly designed controller.
{"title":"Design of hierarchical motion stabilizing controller of tracked mobile robot in three dimensional space","authors":"Yue Ma, C. Xiang, Quanmin Zhu, Q. Yan, A. Winfield","doi":"10.1109/ICMIC.2011.5973756","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973756","url":null,"abstract":"In this paper, stabilizing control of tracked mobile robot in 3-D space was presented. Firstly, models of major modules of TMR were established. Next, to reveal the mechanism of disturbances applied on TMR, two kinds of representative disturbances (slope and general disturbances in yaw motion) were discussed in depth. Consequently, an attempting PID method was employed to compensate the impacts of disturbances and simulation results proved the validity for disturbance incited by slope force, but revealed the lack for general disturbance on yaw motion. Finally, a hierarchical fuzzy controller combined with PID controller was pro posed. In lower level, there were two PID controllers t o compensate the disturbance of slope force, and on top level, the fuzzy logic controller was employed to correct the yaw motion error based on the differences between the model and the real TMR, which was able to guide the TMR maintain on the stable state. Simulation results demonstrated the excellent effectiveness of the newly designed controller.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116170919","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}
This paper is concerned with the stability analysis problem of a delayed Lagrangian neural network designed for solving nonlinear programming problems with linear equality constraints. By constructing a new Lyapnuov-Krasovskii functional and employing the free-weighting matrix method, a less conservative delay-dependent stability criterion is established in terms of linear matrix inequalities (LMIs). Finally, an example is given to illustrate the effectiveness of our proposed method.
{"title":"Improved results on solving convex programming problems with delayed Lagrangian neural networks","authors":"Bonan Huang, Yanhong Luo, Dawei Gong, Huaguang Zhang","doi":"10.1109/ICMIC.2011.5973710","DOIUrl":"https://doi.org/10.1109/ICMIC.2011.5973710","url":null,"abstract":"This paper is concerned with the stability analysis problem of a delayed Lagrangian neural network designed for solving nonlinear programming problems with linear equality constraints. By constructing a new Lyapnuov-Krasovskii functional and employing the free-weighting matrix method, a less conservative delay-dependent stability criterion is established in terms of linear matrix inequalities (LMIs). Finally, an example is given to illustrate the effectiveness of our proposed method.","PeriodicalId":210380,"journal":{"name":"Proceedings of 2011 International Conference on Modelling, Identification and Control","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115261048","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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