scholarly journals Technology for the soft implementing a digital twin into the IoT HVAC control loop

2021 ◽  
Vol 16 (95) ◽  
pp. 33-47
Author(s):  
Aleksey V. Kychkin ◽  
◽  
Oleg V. Gorshkov ◽  
Vladislav A. Selivanov ◽  
Vitaliy A. Pavlov ◽  
...  
Keyword(s):  
Simulation Models ◽  
Ventilation Network ◽  
Control Loop ◽  
Industrial Facilities ◽  
Control Loops ◽  
Digital Twin ◽  
Iot Platform ◽  
Distribution Process ◽  
Dynamic Simulation Model ◽  
Hvac Control

The development of application software for cyber-physical systems of buildings involves the widespread use of Internet of Things (IoT) integration platforms. In practice, the flexible functionality of IoT platforms often leads to additional costs for software enhancement of existing and connection of new units, in particular digital twins. The paper proposes a technological solution for the implementation of a digital twin of the ventilation process in the IoT control loop of heating, ventilation and air conditioning (HVAC) systems for buildings and industrial facilities. The implementation and execution of the digital twin in the form of a dynamic simulation model in the object-oriented modelling language Modelica in the OpenModelica environment is considered. The IoT platform InfluxData, based on the TICK stack, is considered as an example of an integration environment. It is a horizontally-oriented IoT platform that contains the mechanism for collecting data from devices and the InfluxDB time-series database for storing metrics. To integrate simulation models on Modelica with InfluxDB, an OMPython server is proposed. In this case, the integration scripts are executed in the Python language, which as a result extends the traditional capabilities of the IoT platform significantly to the level of a digitally twinned control system. This HVAC control involves adapting control loops by taking into account the dynamics of the air distribution process over the ventilation network, evaluating and compensating for process inertia. The publication was prepared within the framework of the Academic Fund Program at the HSE University in 2020–2021 (grant № 21-04-039).

scholarly journals Simulation Models of Production Plants as a Tool for Implementation of the Digital Twin Concept into Production

2020 ◽  
Vol 20 (4) ◽  
pp. 527-533
Author(s):  
Erika Sujová ◽  
Daniela Vysloužilová ◽  
Helena Čierna ◽  
Roman Bambura
Keyword(s):  
Simulation Models ◽  
Digital Twin

scholarly journals Potential of a "Digital Twin" Technology for the Purposes of Research in the Nizhnekanskiy Rock Mass Underground Research Laboratory

2020 ◽  
Vol 11 (2) ◽  
pp. 99-108
Author(s):  
V. V. Kononov ◽  
◽  
V. L. Tikhonovsky ◽  
S. S. Guralev ◽  
I. A. Bychkova ◽  
...  
Keyword(s):  
Rock Mass ◽  
Research Laboratory ◽  
Digital Technologies ◽  
Research Facility ◽  
Industrial Facilities ◽  
Digital Twin ◽  
Large Complex ◽  
Underground Research Laboratory ◽  
Key Aspects

The paper highlights key aspects associated with the introduction of advanced digital technologies under the development of large complex industrial facilities. It considers the applicability of a "digital twin" technology in the development of an underground research facility in the Niznekanskiy massif (Krasnoyarsk territory) (URF NKM).

scholarly journals Detection and diagnosis of Oscillation in Shell and Tube Heat Exchanger Process

2019 ◽  
Vol 8 (6) ◽  
pp. 2237-2241
Keyword(s):  
Heat Exchanger ◽  
Rejection Rate ◽  
Process Variable ◽  
Control Loop ◽  
Control Loops ◽  
Tube Heat Exchanger ◽  
Analysis Technique ◽  
Product Increase ◽  
Shell And Tube ◽  
Detection And Diagnosis

Oscillations found in process control loops are the visible indications of process deterioration. The presence of oscillation in an industrial control loop may reduce quality of the product; increase the rejection rate and energy consumption which may result in reduced profitability. Many techniques stated in the literature for oscillation diagnosis has their own benefits and limitations. Performance assessment of a single control loop is a valued procedure to spot suddenly rising faults and slowly emerging degradation. In this paper, the oscillations present in the process variable of a Shell and Tube Heat eXchanger (STHX) process are diagnosed using the Higher Order Spectral Analysis (HOSA) in MATLAB. From HOSA, bispectrum, modified bispectrum and bicoherence analysis technique is applied to the laboratory STHX process to spot the probable root cause for oscillations

A Novel SOFC Thermal Management Strategy of SOFC-GT Hybrid System With Anode and Cathode Control Loops

2020 ◽  
Author(s):  
Jinwei Chen ◽  
Yuanfu Li ◽  
Huisheng Zhang ◽  
Zhenhua Lu
Keyword(s):  
Thermal Management ◽  
Temperature Control ◽  
Management System ◽  
Management Strategy ◽  
Inlet Temperature ◽  
Control Performance ◽  
Control Loop ◽  
Control Loops ◽  
Thermal Management System ◽  
Cathode Temperature

Abstract The SOFC performance and lifetime highly depend on the operation condition, especially the SOFC operation temperature. The temperature fluctuation causes thermal stress in electrodes and electrolyte ceramics. On the other hand, it also needs to maintain a sufficiently high temperature to enable the efficient transport of oxygen ions across the electrolyte. Therefore, it is necessary to design an effective SOFC temperature management system to guarantee safe and efficient operation. In this paper, a two-side temperature control method is proposed to avoid the temperature difference between anode and cathode. Therefore, the SOFC thermal management system includes two control loops. The anode inlet temperature and cathode inlet temperature are controlled by blowers adjusting the recirculated flow rate. In addition, the control performance of the proposed SOFC thermal management system is compared with one-side temperature control systems. The results show that both anode control loop and cathode control loop are essential to get a better control performance. The SOFC would operate with less efficiency with only anode temperature control. On the other hand, the safety problem would occur with only cathode temperature control. The temperature gradient would be more than the upper limit at a part load condition. Therefore, the SOFC thermal management strategy with anode and cathode temperature control loops is feasible for the SOFC-GT system.

Mooring Integrity Management through Digital Twin and Standardized Inspection Data

2021 ◽  
Author(s):  
Shunsaku Matsumoto ◽  
Vivek Jaiswal ◽  
Tadashi Sugimura ◽  
Shintaro Honjo ◽  
Piotr Szalewski
Keyword(s):  
Simulation Models ◽  
Sensitivity Analyses ◽  
Maintenance Cost ◽  
Digital Twin ◽  
Diagnosis And Prognosis ◽  
Twin System ◽  
Physics Simulation ◽  
Integrity Management ◽  
Risk Visualization ◽  
Inspection Data

Abstract This paper presents a concept of a mooring digital twin frameworkand a standardized inspection datatemplate to enable digital twin. The mooring digital twin framework supports real-time and/or on-demand decision making in mooring integrity management, which minimizes the failure risk while reducing operation and maintenance cost by efficient inspection, monitoring, repair, and strengthening. An industry survey conducted through the DeepStar project 18403 identified a standard template for recording inspection data as a high priority item to enable application of the digital twins for integrity management. Further, mooring chain was selected as a critical mooring component for which a standard inspection template was needed. The characteristics of damage/performance prediction with the proposed mooring digital twin framework are (i) to utilize surrogates and/or reduced-order models trained by high-fidelity physics simulation models, (ii) to combine all available lifecycle data about the mooring system, (iii) to evaluate current and future asset conditions in a systematic way based on the concept of uncertainty quantification (UQ). The general and mooring-specific digital twin development workflows are described with the identified essential data, physics models, and several UQ methodologies such as surrogate modeling, local and global sensitivity analyses, Bayesian prediction etc. Also, the proposed digital twin system architecture is summarized to illustrate the dataflow in digital twin development andutilization. The prototype of mooring digital twin dashboard, web-based risk visualization and advisory system, is developed to demonstrate the capability to visualize the system health diagnosis and prognosis and suggest possible measures/solutions for the high-risk components as a digital twin's insight.

Digital Twin-Driven Condition-Based Maintenance

2022 ◽  
pp. 109-136
Author(s):  
Adolfo Crespo del Castillo ◽  
Marco Macchi ◽  
Laura Cattaneo
Keyword(s):  
Real Time ◽  
Industry 4.0 ◽  
Simulation Models ◽  
Condition Based Maintenance ◽  
Industrial Management ◽  
Digital Twin ◽  
Operation And Maintenance ◽  
Twin Models ◽  
Technical Professionals ◽  
Case Development

The world is witnessing an all-level digitalization that guides the industry and business to a restructuration in order to adapt to the new requirements of the surrounding environment. That change also concerns the labour of the technical professionals and their formation. As a consequence of this deep consciousness-raising, this chapter will investigate and develop simulation models based on the current digitalization. The aim of this chapter is the exposition of a real case development of “digital twin” models framed as part of the condition-based maintenance paradigm to improve real-time assets operation and maintenance. This model contributes by providing real-time results that could turn into a basis for the industrial management decisions and place them in the Industry 4.0 paradigm environment.

How to design externally positive feedback loops – an open problem of control theory

2020 ◽  
Vol 68 (5) ◽  
pp. 301-311
Author(s):  
Alexander Schwab ◽  
Jan Lunze
Keyword(s):  
Open Problem ◽  
Closed Loop ◽  
Design Procedure ◽  
Positive Control ◽  
Feedback Loops ◽  
Positive Systems ◽  
Control Loop ◽  
Output Variable ◽  
Control Loops ◽  
Loop Dynamics

AbstractThis paper addresses the properties of externally positive systems and summarises existing conditions and design approaches that achieve externally positive closed-loop dynamics. The output variable of such systems is always nonnegative for any nonnegative input which is a very useful property in various control tasks. This paper investigates the problem of rendering control loops externally positive by an appropriate choice of a feedback. It shows that there is currently no general design procedure for that purpose and the question of when such a controller exists has not been clarified yet. It is also shown that there are plants for which there is no controller that leads to an externally positive control loop.

Modelling and simulation of a compliant tilting pad air bearing

2015 ◽  
Vol 230 (1) ◽  
pp. 69-87 ◽  
Author(s):  
Frans Duijnhouwer ◽  
Henk Nijmeijer
Keyword(s):  
Dynamic Simulation ◽  
Time Domain ◽  
Linear Time ◽  
Simulation Models ◽  
Time Domain Analysis ◽  
Air Bearing ◽  
Rotor Systems ◽  
Tilting Pad ◽  
Non Linear ◽  
Dynamic Simulation Model

The compliant tilting pad air bearing concept, a tilting pad bearing with the pivot of the pads placed on radial springs, is a promising aerodynamic bearing solution. Nevertheless, its non-linear dynamics make a time domain dynamic simulation model an essential tool for the design of rotor systems with these bearings. Development of these dynamic simulation models is the subject of this paper that provides a detailed description of an extendible model of the compliant tilting pad air bearing concept suitable for non-linear time domain analysis. 2D and 3D time domain simulations implementing the model are discussed in detail and some of their capabilities to model the non-linear behaviour of the bearing concept are demonstrated with examples.

Resource Efficient Architecture for Current Control Loop of Two PMSMs

2015 ◽  
Vol 741 ◽  
pp. 619-622
Author(s):  
Cho Lung Ryang ◽  
Da Ling Wang
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Pi Controller ◽  
Current Control ◽  
Resource Consumption ◽  
Control Loop ◽  
Verilog Hdl ◽  
Control Loops ◽  
System Generator ◽  
Pi Controllers ◽  
Closed Current

This paper presents a novel closed current control loop of permanent magnet synchronous motor (PMSM). Conventional current control loops need two PI controllers per one PMSM. The paper provides a method for reduction of the resource consumption by using one PI controller for two PMSM. Combining with Black Box Blockset written by Verilog HDL based on Xilinx System Generator, one effective PI controller is designed instead of four PI controllers and simulated using Simulink. The utilization of FPGA resources is verified by Xilinx ISE 14.7 tool. The results show that the proposed method can reduce resource consumption and do not influence system performances observably.

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