{"title":"Towards a Proof of the Kalman Conjecture for the Second Order Systems with Time-Delay","authors":"Jingfan Zhang, W. Heath, J. Carrasco","doi":"10.1109/CONTROL.2018.8516827","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516827","url":null,"abstract":"We believe that second-order systems with time delay satisfy the Kalman conjecture. Recently, we have submitted a paper constructing Zames-Falb multipliers for several cases [1], but a formal proof is still to be developed. This abstract summarises recent development towards a formal proof of the above statement. The construction of the multiplier is irrational, and the proof cannot be developed as in the non-delay case as it uses the pole location of the closed-loop system at the Nyquist gain. Hence a proof would be significantly different from the current proofs provided of the Kalman conjecture for different cases [2]–[4].","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116983575","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}
{"title":"Weighted Point-to-Point Repetitive Control for Drop-Foot Assistance","authors":"A. Page, C. Freeman, B. Chu","doi":"10.1109/CONTROL.2018.8516840","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516840","url":null,"abstract":"Drop-foot is a neurological condition caused by nerve damage or as a result of a brain/spinal injury. The condition leads to a abnormal, slow, tiring gait with an increased probability of falls. Functional electrical stimulation (FES) has had considerable success in treating drop-foot, but commercial approaches lack closed loop control which degrades there performance. Currently closed loop controllers available in the research domain require significant sensory data or have limited accuracy, making them unsuitable for implementation. This paper is the first application of repetitive control (RC) to this problem. To overcome data requirements whilst maintaining accuracy of key gait events, a comprehensive point to point framework is derived. Further to this, a weighted modification is proposed allowing prioritisation of points. Simulation results for the ‘weighted point-to-point’ and ‘point-to-point’ RC frameworks for FES-assisted drop-foot confirm their improved convergence and robust performance properties.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861059","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}
{"title":"Recent Findings on Strong Integral Input-to-State Stability for Forced Lur'e Systems","authors":"C. Guiver, H. Logemann","doi":"10.1109/CONTROL.2018.8516772","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516772","url":null,"abstract":"We would like to present recent theoretical results on the strong integral Input-to-State Stability (strong iISS) for the following class of finite-dimensional, continuous-time forced Lur'e systems:","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115357882","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}
C. Galatsopoulos, S. Papadopoulou, C. Ziogou, Dimitris Trigkas, C. Yfoulis, S. Voutetakis
{"title":"Non-Linear Model Predictive Control for Preventing Premature Aging in Battery Energy Storage System","authors":"C. Galatsopoulos, S. Papadopoulou, C. Ziogou, Dimitris Trigkas, C. Yfoulis, S. Voutetakis","doi":"10.1109/CONTROL.2018.8516720","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516720","url":null,"abstract":"This paper discusses non-linear model predictive control (NMPC) for preventing premature aging in a Battery Energy Storage System (BESS). The BESS can be used in both residential and commercial buildings in order to reduce the cost of energy consumption. Apart from maintaining the BESS's life expectancy, the NMPC is also responsible for securing the maximum possible economic profit. The implementation of the NMPC requires the modeling of the BESS, the modeling of an aging prediction mechanism for the 15-Lithium Ion batteries stack and the identification of the needs and requirements for energy management in a dynamic pricing environment where the GRID is the unique source of power to the building and to the BESS. The NMPC utilizes forecasted profiles for the energy demand and the energy prices which are retrieved from a data knowledge warehouse in order to propose an optimal discharge profile for the BESS. Furthermore, the intra-day alternations of the energy prices and the uncertainty that the day-ahead energy demand profile will match the actual demand profile, makes the necessity of the controller to update the proposed discharge profile during the day inevitable. Indicative results of the proposed method are presented in order to demonstrate the ability of the NMPC to provide an optimal solution for achieving a specific capacity loss target for the batteries stack and simultaneously ensuring high financial profit.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114259589","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}
{"title":"Linear System Identification of Longitudinal Vehicle Dynamics Versus Nonlinear Physical Modelling","authors":"Sebastian S. James, S. Anderson","doi":"10.1109/CONTROL.2018.8516756","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516756","url":null,"abstract":"Mathematical modelling of vehicle dynamics is essential for the development of autonomous cars. Many of the vehicle models that are used for control design in cars are based on nonlinear physical models. However, it is not clear, especially for the case of longitudinal dynamics, whether such nonlinear models are necessary or simpler models can be used. In this paper, we identify a linear data-driven model of longitudinal vehicle dynamics and compare it to a nonlinear physically derived model. The linear model was identified in continuous-time state-space form using a prediction error method. The identification data were obtained from a Lancia Delta car, over 53 km of normal driving on public roads. The selected linear model was first order with requested torque, brake and road gradient as inputs and car velocity as output. The key results were that 1. the linear model was accurate, with a variance accounted for (VAF) metric of VAF=96.5%, and 2. the identified linear model was also superior in accuracy to the nonlinear physical model, VAF=77.4%. The implication of these results, therefore, is that for longitudinal dynamics, in normal driving conditions, a first order linear model is sufficient to describe the vehicle dynamics. This is advantageous for control design, state estimation and real-time implementation, e.g. in predictive control.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130651062","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}
{"title":"Probabilistic Decoupling Control for Stochastic Non-Linear Systems Using EKF-Based Dynamic Set-Point Adjustment","authors":"Qichun Zhang, Liang Hu","doi":"10.1109/CONTROL.2018.8516784","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516784","url":null,"abstract":"In this paper, a novel decoupling control scheme is presented for a class of stochastic non-linear systems by estimation-based dynamic set-point adjustment. The loop control layer is designed using PID controller where the parameters are fixed once the design procedure is completed, which can be considered as an existing control loop. While the compensator is designed to achieve output decoupling in probability sense by a set-point adjustment approach based on the estimated states of the systems using extended Kalman filter. Based upon the mutual information of the system outputs, the parameters of the set-point adjustment compensator can be optimised. Using this presented control scheme, the analysis of stability is given where the tracking errors of the closed-loop systems are bounded in probability one. To illustrate the effectiveness of the presented control scheme, one numerical example is given and the results show that the systems are stable and the probabilistic decoupling is achieved simultaneously.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132203064","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}
{"title":"Mechanical Hybrid Control for Heavy-Goods Vehicle","authors":"Fatin Gunes, Yixin Yang, B. Kim, M. Wellers","doi":"10.1109/CONTROL.2018.8516740","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516740","url":null,"abstract":"As fuel consumption and emissions regulations for heavy goods vehicles (HGV) are getting stringent, it is becoming increasingly important to develop new technologies for next generation of HGVs. A new mechanical hybrid system is developed with Kinetic Energy Recovery System (KERS) to increase fuel economy. This system is compared with a conventional system by simulating for driving cycles on AVL CRUISE. A mechanical hybrid controller has been developed and its performance assessed by fuel consumption results on driving cycles of VECTO Long-Haul (Vehicle Energy Consumption Calculation Tool) and WHVC (World Harmonized Vehicle Cycle). Driving cycle simulation result provide an insight of target customer of the new technology.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"330 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134016012","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}
{"title":"Efficient Implementation of Rate Constraints for Nonlinear Optimal Control","authors":"Yuanbo Nie, E. Kerrigan","doi":"10.1109/CONTROL.2018.8516847","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516847","url":null,"abstract":"We present a computationally efficient method to implement rate constraints for state and input variables directly on the discretization mesh for all h, p and hp collocation methods. Compared to existing methods, singular arc free solutions can be obtained, together with a reduction in computation time of more than 20%.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134146843","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}
Isaac Zeca, Yuzhu Guo, F. Storm, C. Mazzà, Lingzhong Guo
{"title":"Estimation of Centre of Pressure from Wearable Intertial Sensors","authors":"Isaac Zeca, Yuzhu Guo, F. Storm, C. Mazzà, Lingzhong Guo","doi":"10.1109/CONTROL.2018.8516891","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516891","url":null,"abstract":"Conventionally, centre of pressure (COP) measurements are acquired using force plate systems or instrumented treadmill devices. Despite their accuracy, these standard measuring techniques are restricted to laboratory settings, expensive equipment, and may not replicate normal outdoor walking, thus imposing some constraints on the ability to measure human movement. In this study, we propose a new method to estimate foot COP during walking, using exclusive information from wearable inertial sensors located in different parts of body. The dynamic relationship between the inertial sensor information (i.e. accelerations, angular velocities and quaternion orientation) and the measured COP using two-foot pressure insole sensors has been identified using a nonlinear autoregressive moving average with exogenous input (NARMAX) model. The results show that the COP movement can be estimated with high accuracy using only a single inertial sensor attached to the left ankle. The relative prediction errors were around 2.7% in the anterior-posterior direction (x-axis, forward and backward), and 7.6% in the medial-lateral direction (y-axis, side-to-side) for the left ankle sensor, which are comparable to 2.5% and 7.1% in the anterior-posterior and medial-lateral directions, respectively, when all six sensors were used. The proposed approach provides a promising low-cost method for COP estimation and continuous monitoring of gait characteristics in daily life applications.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"425 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131836808","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}
Carlos A. Duran-Villalobos, B. Lennox, S. Goldrick
{"title":"Fault Tolerant MPC for Fed-Batch Penicillin Production","authors":"Carlos A. Duran-Villalobos, B. Lennox, S. Goldrick","doi":"10.1109/CONTROL.2018.8516796","DOIUrl":"https://doi.org/10.1109/CONTROL.2018.8516796","url":null,"abstract":"Biopharmaceutical manufacturing is an inherently complex operation with industrial-scale control strategies often failing to accurately account for faults and product variation that can result in significant economic losses. In response, this work presents a fault-tolerant Model Predictive Control (MPC) strategy which solves a modified version of a Quadratic Programming (QP) problem, using a data-driven adaptive Multivariate Partial Least Square (MPLS) model. The proposed technique is applied to an industrial simulation of a fed-batch process and found to improve operations significantly.","PeriodicalId":266112,"journal":{"name":"2018 UKACC 12th International Conference on Control (CONTROL)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127724387","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}