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Dynamic color control in multiprimary tunable LED lighting systems

JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY 2019年第9期27卷 570-580页

作者： Murdoch, Michael J. Rochester Inst Technol Munsell Color Sci Lab 54 Lomb Mem Dr Rochester NY 14623 USA

Temporally dynamic tunable light-emitting diode (LED) lighting systems offer multiple spectral degrees of freedom and enable the creation of composite light spectra with a wide range of perceptual characteristics. Connecting existing metrics and ongoing research, this paper introduces relevant measures of quality of light, color, and temporal performance characteristics, including color rendition, circadian stimulation potential, and temporal smoothness and speed. Multiprimary system models describing both colorimetric and spectral characteristics are explained, along with colorimetric-plus multiprimary intensity solutions that allow optimization of any of these quality of light characteristics in addition to ensuring a colorimetric match. Three commercial multiprimary LED systems are modeled to show examples of spectral solutions for different colorimetric-plus optimization goals, and their range of performance are discussed. The diversity of results shows both the need for usable optimization tools and the need for clear communication standards about quality of light when light sources are capable of much more than typical fixed-color lights.

关键词： circadian lighting color rendition control algorithms LED lighting spectral tuning

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Impact of Boundary Conditions on the Performance Enhancement of Advanced control Strategies for a Residential Building with a Heat Pump and PV System with Energy Storage

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ENERGIES 2020年第6期13卷 1413页

作者： Psimopoulos, Emmanouil Johari, Fatemeh Bales, Chris Widen, Joakim Dalarna Univ Energy Technol S-78170 Borlange Sweden Uppsala Univ Dept Engn Sci S-75121 Uppsala Sweden

Operational control strategies for the heating system of a single-family house with exhaust air heat pump and photovoltaic system and "smart" utilization of energy storage have been developed and evaluated in a simulation study. The main aim and novelty of this study is to evaluate the impact on the benefit of these advanced control strategies in terms of performance (energy use and economic) for a wide range of boundary conditions (country/climate, occupancy and appliance loads). Short-term weather data and historic price data for the same year as well as stochastic occupancy profiles that include the domestic hot water load are used as boundary for a parametric simulation study for the system modeled in detail in TRNSYS 17. Results show that the control using a forecast of dynamic electricity price leads to greater final energy savings than those due to the control using thermal storage for excess PV production in all of the examined locations except Sweden. The impact on self-consumption using thermal storage of heat produced by the heat pump using excess PV production is found to decrease linearly with increasing household electricity for all locations. A reduction in final energy of up to 842 kWh year(-1) can be achieved just by the use of these algorithms. The net energy cost for the end-user follows the same trend as for final energy and can result in cost savings up to 175 Euro year(-1) in Germany and Spain due to the use of the advanced control.

关键词： photovoltaics heat pump thermal storage electrical storage control algorithms forecast services self-consumption final energy

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Dynamics and control of a thermally self-sustaining energy storage system using integrated solid oxide cells for an islanded building

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2021年第49期46卷 24891-24908页

作者： Mottaghizadeh, Pegah Fardadi, Mahshid Jabbari, Faryar Brouwer, Jack Univ Calif Irvine Natl Fuel Cell Res Ctr Irvine CA 92697 USA Univ Calif Los Angeles Mech & Aerosp Engn Los Angeles CA 90095 USA Univ Calif Irvine Mech & Aerosp Engn Irvine CA 92697 USA

A solid oxide cell-based energy system is proposed for a solar-powered stand-alone building. The system is comprised of a 5 kW(el) solid oxide fuel cell (SOFC), a 9.5 kW(el) solid oxide electrolysis cell (SOEC), and the required balance of plant. The SOFC supplies: 1 building demand in the absence of sufficient solar power, 2-heat for SOEC in endothermic and standby modes. Thermal integration of SOFC and SOEC is implemented through a network of heat exchangers, combined with set of control algorithms. Two control strategies were implemented to actuate the SOFC in response to endothermic heat demands of SOEC by manipulating: 1-electric power, 2-fuel utilization. The results of dynamic simulation of system for two scenarios (sunny day and cloudy day) showed successful compliance of temperature constraints with both methods. Manipulation of fuel utilization, however, resulted in better system performance in terms of efficiency and H-2 balance. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Dynamic energy storage system Thermal management Hydrogen Electrolyzer Fuel cell control algorithms

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Semi-active continuous control of base-excited structures: An exploratory study

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STRUCTURAL control & HEALTH MONITORING 2010年第5期17卷 563-589页

作者： Renzi, Emanuele De Angelis, Maurizio Univ Roma La Sapienza Dept Struct & Geotech Engn I-00186 Rome Italy Consiglio Super Lavori Pubbl STC Minist Infrastrutture & Trasporti Rome Italy

The semi-active (SA) control techniques appear a realistic way to adopt active control in structural engineering. This paper reports an exploratory study on SA continuous control, where the mechanical parameters of the devices may continuously assume any value between the given limits. First, a Lyapounov-based control strategy for SA continuous control is proposed and studied for base-excited structures. The obtained continuous control process is initially applied to a seismic-excited single-DOF structure with a variable stiffness device, in order to study the dynamics of the controlled system and the optimal configuration of the algorithm. Successively, the optimized control strategy is applied to single-DOF structures with more realistic SA elasto-plastic devices, and the performances of SA continuous control are compared with the ones of passive and SA ON-OFF control cases. Finally, the obtained results are verified and confirmed in the application to a 4-storey Multi-DOF-framed structure, equipped with continuously variable SA magnetorheological dampers. The study shows the applicability and the possible advantages of the proposed control case, also in comparison with passive and SA ON-OFF cases. Generally it may be stated that the best performances in terms of structural displacements may be obtained by using ON-OFF SA control. Differently, continuous SA control significantly reduces the absolute accelerations and the total forces transmitted to the structures. Copyright (C) 2009 John Wiley & Sons, Ltd.

关键词： semi-active control continuous and ON-OFF control optimization base-excited structures structural vibrations control algorithms

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Hybrid AI/control system interactions and analysis

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JOURNAL OF EXPERIMENTAL & THEORETICAL ARTIFICIAL INTELLIGENCE 2004年第4期16卷 189-208页

作者： Henshaw, CG Sanner, RM Honeywell Technol Solut Inc Las Cruces NM USA Univ Maryland Space Syst Lab College Pk MD 20742 USA

This paper discusses the nature of interactions between high-level intelligent agents and low-level control algorithms. control algorithms offer the promise of simplifying a system's dynamic behaviour as perceived by the controlling agent, thus considerably simplifying the agent's tasks of planning and execution. However, the coupled dynamics of such a hybrid system can be difficult to predict and may even lead to undesirable behaviour. This paper demonstrates that it is possible for a rational intelligent agent commanding a system with a well-designed control algorithm to cause catastrophic behaviours, and presents a framework for analysing the coupled dynamics of hybrid systems. A technique for alleviating these behaviours is suggested, using newly developed control algorithms applicable to a wide variety of autonomous systems of current interest. These controllers can also themselves be made adaptive, allowing for the possibility of 'distributed' or 'cooperative' learning and reasoning. As the control algorithm learns models of the physical system, this information can be passed back to the controlling agent, allowing it to alter its goals and strategies accordingly. A new architecture for hybrid systems encapsulating these ideas is then suggested.

关键词： control algorithms intelligent agents stability analysis pilot-induced oscillations

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A generic event control framework fbr modular flexible manufacturing systems

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COMPUTERS & INDUSTRIAL ENGINEERING 2000年第1期38卷 107-123页

作者： Park, JH Park, JW Kim, JW Georgia Inst Technol Sch Ind & Syst Engn Atlanta GA 30332 USA Seoul Natl Univ Dept Ind Engn Seoul South Korea Seoul Natl Univ Sch Mech & Aerosp Engn Seoul South Korea

A generic event control framework is presented for a class of modular flexible manufacturing systems (FMSs). A modular FMS is characterized as a set of flexible workstations inter-connected by a material handling system consisting of a transporter and a stocker. Many of the existing FMS implementations in industry fall into this class. Furthermore, the modularity also allows the capability to effectively model a complex FMS by decomposing it into several modular FMSs. In order to achieve reconfigurability of control system for various FMS implementations and control policies, the proposed control framework is defined as a set of distributed resource controllers and a central system supervisor coordinating them. The resource controllers are further classified into workstation, transporter, and stocker controllers. As the controllers exchange a series of events according to pre-defined protocols, they are modelled as event handlers in which control actions are made based on the event occurrences. Specifically, for each controller, an event-based control structure specified in terms of generic logical and performance control functions, is presented. Since the proposed framework is defined by the use of the interacting distributed processes with the well-defined protocols and computationally efficient algorithms, it is expected that the framework is easily implementable for most industrial FMSs. Finally, the performance and reconfigurability is demonstrated by the distributed simulation from which we can also verify the correctness of the proposed algorithms. (C) 2000 Elsevier Science Ltd. All rights reserved.

关键词： flexible manufacturing system control algorithms event control

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Data-driven and adaptive control applications to a wind turbine benchmark model

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control ENGINEERING PRACTICE 2013年第12期21卷 1678-1693页

作者： Simani, Silvio Castaldi, Paolo Univ Ferrara Dept Engn I-44122 Ferrara FE Italy Univ Bologna Fac Aerosp Engn I-47100 Forli FC Italy

Wind turbines are complex dynamic systems forced by stochastic wind disturbances, as well as gravitational, centrifugal, and gyroscopic loads. Since their aerodynamics are nonlinear, wind turbine modelling is thus challenging. Moreover, accurate models should contain many degrees of freedom to capture the most important dynamic effects. Therefore, the design of control algorithms for wind turbines should account for these complexities. However, these algorithms must capture the most important turbine dynamics without being too complex and unwieldy. The main purpose of this study is thus to give two examples of viable and practical designs of control schemes with application to a wind turbine prototype model. Extensive simulations on the benchmark process and Monte-Carlo analysis are the tools for assessing experimentally the main features of the proposed control schemes, in the presence of modelling and measurement errors. These developed control methods are also compared with other different approaches, in order to evaluate advantages and drawbacks of the considered solutions. Finally, Hardware-In-the-Loop simulations serve to highlight the potential application of the proposed control strategies to real wind turbines. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： control algorithms Fuzzy modelling and control Recursive estimation Adaptive PI controllers Wind turbine model

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A Critical Review on control Strategies for Structural Vibration control

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ANNUAL REVIEWS IN control 2022年 54卷 103-124页

作者： Wani, Zubair Rashid Tantray, Manzoor Farsangi, Ehsan Noroozinejad Nikitas, Nikolaos Noori, Mohammad Samali, Bijan Yang, T. Y. Indian Inst Sci Dept Civil Engn Bangalore India Natl Inst Technol Srinagar Dept Civil Engn Srinagar 190006 Jammu & Kashmir India Univ British Columbia Dept Civil Engn Vancouver BC Canada Southeast Univ Int Inst Urban Syst Engn Nanjing Peoples R China Univ Leeds Sch Civil Engn Leeds LS2 9JT England Calif Polytech State Univ San Luis Obispo Dept Mech Engn San Luis Obispo CA USA Univ Leeds Sch Civil Engn Leeds England Western Sydney Univ Ctr Infrastructure Engn Sch Engn Design & Built Environm Penrith NSW Australia

In recent years, the application of structural control strategies to attenuate the dynamic response of civil engi-neering structures subjected to human-induced and environmental loads has once again received much attention. The hardware involved in providing effective control, the stochastic nature of the dynamic excitation, the number of distinct variables required to determine the dissipating forces, and the nature of the control approach are a few of the parameters involved in determining the efficacy of structural control systems. However, the primary parameter to determine the overall performance of a smart adaptive structure is the implementation of a control algorithm that would conveniently counteract the external known and/or unknown excitation by providing additional force input through control devices. The control algorithm to be adopted should be robust, multi-purpose, and simple to design and implement. Moreover, the control algorithm should provide the flexi-bility in selecting performance objectives for a holistically effective response reduction. This paper focuses on providing a comprehensive review of control algorithms implemented in structural control engineering. This article first provides an overview of the fundamental concepts pertaining to the vibration control of structures subjected to dynamic excitations. Next, an exhaustive review of different types of control algorithms that feed the input signal to active-type control devices is conducted. Thereafter, important benchmark applications in the field of structural control in civil engineering are presented. Finally, conclusions are presented on the advantages and drawbacks of each control strategy and recommendations are presented for further research in this area.

关键词： Structural control control algorithms Non -Linear control algorithms Active control Resilience

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Robotic force control using virtual trajectory generation

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JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND control-TRANSACTIONS OF THE ASME 1999年第2期121卷 320-322页

作者： Fielding, TS Mills, JK Univ Toronto Dept Mech & Ind Engn Lab Nonlinear Syst Control Toronto ON M5S 3G8 Canada

A control method is introduced to permit the retrofit of a large class of commercially available industrial robots with a contact force control capability. In this control algorithm, the outer force loop modifies the desired position input trajectory by solving two sets of differential equations as initial value problems. Experimental results, obtained on a CRS Robotics Corporation A460 six degree of freedom industrial robot, are presented which demonstrate the effectiveness of the proposed approach.

关键词： Differential equations Robotics control algorithms Force control Trajectories (Physics) Robots Degrees of freedom

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Investigation on active vibration control to improve surface quality in precision milling process

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE 2024年第11期238卷 1593-1609页

作者： Guo, Miaoxian Xia, Wanliang Liu, Jin Guo, Weicheng Wu, Chongjun Univ Shanghai Sci & Technol Sch Mech Engn 516 Jungong Rd Shanghai 200093 Peoples R China Donghua Univ Sch Mech Engn Shanghai Peoples R China

The tool-workpiece vibration in the precision milling process plays a pivotal role in influencing the surface quality. To solve the machining problem coming with the process vibration, the active vibration control model as well as the corresponding platform are developed, and the active vibration control algorithms are applied to reduce the relative vibrations and improve the surface quality. Firstly, the milling vibration reduction and surface quality improvement are modeled based on the active control algorithms and the system dynamic characteristics. Then, applying the different algorithm control strategies, such as PID, Fuzzy PID, BP neural network, and BP neural network PID control, the control effect is simulated and analyzed. Finally, an experimental platform is established to validate the system's reliability. The efficiency of various active control methods is compared in terms of frequency vibration control and surface finish roughness improvement. The results indicate that under different milling parameters, the four algorithm control strategies exhibit optimal effects of 13.5%, 30.4%, 28.8%, and 40.1% respectively. These findings provide valuable insights into selecting the optimal vibration control method for precision milling.

关键词： Surface quality precision milling dynamic modeling active vibration control control algorithms

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