scholarly journals Intelligent Situational Control of Small Turbojet Engines

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Rudolf Andoga ◽  
Ladislav Főző ◽  
Jozef Judičák ◽  
Róbert Bréda ◽  
Stanislav Szabo ◽  
...  
Keyword(s):  
Control System ◽  
State Of The Art ◽  
Diagnostic System ◽  
Cost Effective ◽  
Modular Control ◽  
Turbojet Engine ◽  
Digital Control Systems ◽  
Operational Quality ◽  
Advanced Control ◽  
Software Updates

Improvements in reliability, safety, and operational efficiency of aeroengines can be brought in a cost-effective way using advanced control concepts, thus requiring only software updates of their digital control systems. The article presents a comprehensive approach in modular control system design suitable for small gas turbine engines. The control system is based on the methodology of situational control; this means control of the engine under all operational situations including atypical ones, also integrating a diagnostic system, which is usually a separate module. The resulting concept has been evaluated in real-world laboratory conditions using a unique design of small turbojet engine iSTC-21v as well as a state-of-the-art small turbojet engine TJ-100. Our results show that such advanced control system can bring operational quality of an engine with old turbocompressor core iSTC-21v on par with state-of-the-art engines.

Wireless Starting System and Emergency Stop for Teleoperated Hydraulic Mobile Machine

2004 ◽  
Author(s):  
Jarno R. A. Uusisalo ◽  
Albert Raneda ◽  
Jani M. Vilenius ◽  
Kalevi J. Huhtala
Keyword(s):  
Control System ◽  
Wireless Local Area Network ◽  
Data Transfer ◽  
Local Area Network ◽  
Diagnostic System ◽  
Cost Effective ◽  
Area Network ◽  
Safe Place ◽  
Emergency Stop ◽  
Mobile Machine

A small general-purpose teleoperated hydraulic mobile machine is studied at the Institute of Hydraulics and Automation at the Tampere University of Technology. Thanks to teleoperation, the operator of the machine is able to be in safe place during the driving when necessary. However, the actions of the machine can be dangerous for the people or the objects in the environment if problems appear for instance in the control system. On that account, safety issues must be considered carefully. Special attention has to be paid to stop the machine and start the engine again once the machine has recovered from an error situation. The goal of this paper is to describe the design and implementation of different kind of solutions to start and stop the machine wirelessly. The emergency stop can be activated through the wireless connection by the operator or by the automatic diagnostic system of the hydraulic mobile machine. The control system monitors the state of several hydraulic components such as hydraulic valves and motors by means of sensors during the operations of machine. The machine is teleoperated by using WLAN (Wireless Local Area Network) connection. The developed wireless starting system and emergency stop is totally independent of the WLAN link. In the first prototype of the wireless starting system and emergency stop, the wireless connection is carried out by using commercial, cost effective RF (Radio Frequency) modules. The data transfer protocol which is used by the modules is designed for this application. Protocol implementation is carried out with microcontrollers. Another version of the wireless starting system and emergency stop is carried out by using radio modems. The modems have better properties than the cost effective RF modules used in the first prototype due to their higher RF output power. Programmatically carried out automatic emergency stop, which stops the machine, if the WLAN connection between the control station and the machine breaks, is discussed. In that case, the independent wireless emergency stop connection is not needed. Implementations of the system are introduced in this paper. Also, some testing results and user experiences are described. Properties of these different implementations are compared: cost of the system, range, reliability and complexity of the implementation. By means of the studied results the most suitable solution to start the engine and stop the actions of the machine is chosen.

scholarly journals Retrofitting Turbocompressor Unit and Station Controls

1994 ◽  
Author(s):  
Jack P. Leuw
Keyword(s):  
Control Systems ◽  
State Of The Art ◽  
Cost Effective ◽  
Compressor Unit ◽  
Service Interruptions ◽  
Digital Control Systems ◽  
Effective Manner ◽  
Turbo Compressor ◽  
Analog Systems ◽  
Improve Reliability

For TransCanada PipeLines, the need to retrofit station and compressor unit controls has been driven by the requirements to improve reliability, availability and cost and difficulties associated with interfacing new digital control systems with existing analog systems. TransCanada’s massive four year expansion program has exacerbated this need. TransCanada’s turbo compressor controls are becoming obsolete, they are difficult to troubleshoot and maintain, do not control a unit as effectively as newer digital controls and do not have adequate operator or technician interfaces and diagnostics. This paper describes TransCanada PipeLines reasons and experiences in retrofitting state-of-the-art digital controls in a cost effective manner while minimizing service interruptions.

Upgrade of the HET segment control system, utilizing state-of-the-art, decentralized and embedded system controllers

2016 ◽  
Author(s):  
Marco Häuser ◽  
Josef Richter ◽  
Herman Kriel ◽  
Amanda Turbyfill ◽  
Brent Buetow ◽  
...  
Keyword(s):  
Control System ◽  
Embedded System ◽  
State Of The Art

IN MINIMAL ACCESS SURGERY

1996 ◽  
Vol 17 (12) ◽  
pp. 441-447
Author(s):  
Thom E Lobe
Keyword(s):  
Medical Care ◽  
Pediatric Patient ◽  
Endoscopic Surgery ◽  
State Of The Art ◽  
Outpatient Surgery ◽  
Cost Effective ◽  
Surgical Instruments ◽  
Short Stay ◽  
Minimal Access ◽  
Access Surgery

The pediatrician must be cognizant of the extensive applications of endoscopic surgery in the pediatric patient. The ability to provide either outpatient surgery or short-stay surgery appears to be cost-effective and appropriate state-of-the-art medical care. As the array of surgical instruments continues to evolve, new and innovative endoscopic procedures will become increasingly available.

Advanced Control System Considerations for Small Shaft-Type Aircraft Gas Turbines

1970 ◽  
Author(s):  
D. A. Prue ◽  
T. L. Soule
Keyword(s):  
Control System ◽  
Gas Turbines ◽  
Evaluation Criteria ◽  
Open Loop ◽  
Engine Control ◽  
Gas Generator ◽  
Engine Control System ◽  
Power Turbine ◽  
Advanced Control ◽  
Temperature Load

The next generation of free-turbine engines in the 2 to 5-lb/sec airflow class will undergo vast improvements in performance and efficiency. The improvements will be achieved concurrent with overall reductions in size and weight. Effort is required at optimization and miniaturization of the engine control system to keep pace with these improvements. This paper describes a conceptual design of an advanced engine control system for this class of engine. It provides gas generator and power turbine control with torque, temperature, load sharing and overspeed limiting functions. The control system was concepted to accommodate, with minimum hardware changes, such variants as regenerative cycle and/or variable power turbine geometry. In addition, considerations for closed and open loop modes of control and fluidic, electronic and hydromechanical technologies were studied to best meet a defined specification and a weighted set of evaluation criteria.

Real-time modeling of retractable self-launching glider using spreadsheets

2017 ◽  
Vol 89 (6) ◽  
pp. 791-796
Author(s):  
Yasser A. Nogoud ◽  
Attie Jonker ◽  
Shuhaimi Mansor ◽  
A.A.A. Abuelnuor
Keyword(s):  
Control System ◽  
High Performance ◽  
Cost Effective ◽  
Visual Presentation ◽  
Content Type ◽  
Spreadsheet Model ◽  
Time Modeling ◽  
Model Complex ◽  
Effective Development ◽  
And Control

Purpose This paper aims to propose a spreadsheet method for modeling and simulation of a retraction system mechanism for the retractable self-launching system for a high-performance glider. Design/methodology/approach More precisely, the method is based on parametric link design using Excel spreadsheets. Findings This method can be used for kinematic and dynamic analysis, graphical plotting and allows simulation of control kinematics with the ability to make quick and easy parametric changes to a design. It also has the ability to calculate the loads imposed on each component in the control system as a function of input loads and position. Practical implications This paper shows that it is possible to model complex control systems quickly and easily using spreadsheet programs already owned by most small companies. The spreadsheet model is a parametric model, and it gives a simple visual presentation of the control system with interactive movement and control by the user. Originality/value This spreadsheet model in conjunction with a simple CAD program enables the rapid and cost-effective development of control system components.

Digital Instrumentation and Control Failure Events Derivation and Analysis by Frame-Based Technique

2006 ◽  
Author(s):  
Hui-Wen Huang ◽  
Chunkuan Shih ◽  
Swu Yih ◽  
Yen-Chang Tzeng ◽  
Ming-Huei Chen
Keyword(s):  
Control System ◽  
Control Systems ◽  
Digital Control ◽  
Physical Parameters ◽  
Line System ◽  
Core Flow ◽  
Software Failure ◽  
Digital Control Systems ◽  
Cognitive Frame ◽  
Abnormal Condition

A frame-based technique, including physical frame, logical frame, and cognitive frame, was adopted to perform digital I&C failure events derivation and analysis for generic ABWR. The physical frame was structured with a modified PCTran-ABWR plant simulation code, which was extended and enhanced on the feedwater system, recirculation system, and steam line system. The logical model is structured with MATLAB, which was incorporated into PCTran-ABWR to improve the pressure control system, feedwater control system, recirculation control system, and automated power regulation control system. As a result, the software failure of these digital control systems can be properly simulated and analyzed. The cognitive frame was simulated by the operator awareness status in the scenarios. Moreover, via an internal characteristics tuning technique, the modified PCTran-ABWR can precisely reflect the characteristics of the power-core flow. Hence, in addition to the transient plots, the analysis results can then be demonstrated on the power-core flow map. A number of postulated I&C system software failure events were derived to achieve the dynamic analyses. The basis for event derivation includes the published classification for software anomalies, the digital I&C design data for ABWR, chapter 15 accident analysis of generic SAR, and the reported NPP I&C software failure events. The case study of this research includes (1) the software CMF analysis for the major digital control systems; and (2) postulated ABWR digital I&C software failure events derivation from the actual happening of non-ABWR digital I&C software failure events, which were reported to LER of USNRC or IRS of IAEA. These events were analyzed by PCTran-ABWR. Conflicts among plant status, computer status, and human cognitive status are successfully identified. The operator might not easily recognize the abnormal condition, because the computer status seems to progress normally. However, a well trained operator can become aware of the abnormal condition with the inconsistent physical parameters; and then can take early corrective actions to avoid the system hazard. This paper also discusses the advantage of Simulation-based method, which can investigate more in-depth dynamic behavior of digital I&C system than other approaches. Some unanticipated interactions can be observed by this method.

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