U. S. Navy Ship Service Gas Turbine Generator Thermocouple Logic Enhancements to Improve Reliability

2014 ◽  
Author(s):  
John Viercinski ◽  
Matthew Hoffman ◽  
Ivan Pineiro ◽  
Dennis Russom ◽  
Helen Kozuhowski ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Temperature Monitoring ◽  
The Other ◽  
Monitoring And Control ◽  
Control Logic ◽  
Turbine Generator ◽  
The Individual ◽  
And Control ◽  
Improve Reliability

The U. S. Navy uses Rolls-Royce gas turbines for ship service power on the DDG-51 class destroyer and the CG-47 class cruiser. Both engines have duplex thermocouples (T/Cs) and redundant T/C harnesses for turbine temperature monitoring and control. One harness provides an average of all the installed T/Cs, while the other provides the full authority digital control (FADC) with an individual signal from each. The legacy FADC algorithm allows up to four T/Cs to be out of average on the individual harness. Any additional T/C failures will cause the control to ignore the entire individual harness and rely on the averaging harness alone. This logic has inadvertently led to multiple over-temp conditions and subsequent engine removals. A change to control logic has been developed that aims to prevent these over-temp scenarios and is currently being introduced to the fleet. This paper will discuss in depth the cause of the over-temp, the examination of the control logic and the correction that is designed to prevent it from recurring.

Base-Metal Thermocouple Technology for Improved Temperature Measurement in Gas Turbine Engines

1993 ◽  
Author(s):  
C. Paul Furniss
Keyword(s):  
Temperature Measurement ◽  
Engineering Design ◽  
Gas Turbine ◽  
Gas Turbines ◽  
New Technologies ◽  
Monitoring And Control ◽  
Unit Power ◽  
End Use ◽  
Power Outputs ◽  
And Control

During the next decade there will be growing pressures placed upon the manufacturers of gas turbines to produce more operationally efficient engines. There are two main end-use groupings for gas turbines. The parameters for efficiency may prove to be quite different for these end-use groups, requiring a separate emphasis for engineering design. With respect to aircraft propulsion gas turbines, the efficiencies may tend towards greater fuel economy and unit power outputs. In contrast to this the ground based gas turbine units may require increased unit power output but be restricted by the tightening emission requirements being dictated by international pollution laws. One of the key areas of focus for engineering design, in order to satisfy such performance demands, is that of improved operational control of the turbine. The process variables requiring accurate, reliable and repeatable monitoring and control include rotational speed, linear speed, pressure, mass flow rate and temperature. Whilst all of these phenomena require correct control, it may be argued that temperature is of extreme importance for both an operational efficiency and safety viewpoint. This paper will attempt to explore the problems associated with conventional methods of gas turbine temperature measurement and discuss possible solutions using novel new technologies that will allow the earlier realisation of these efficiency goals.

The Low Emission Turbogas Hybrid Vehicle Concept—Preliminary Simulation and Vehicle Packaging

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
R. Capata ◽  
E. Sciubba
Keyword(s):  
Gas Turbine ◽  
Hybrid Vehicle ◽  
Monitoring And Control ◽  
Control Logic ◽  
Storage Devices ◽  
Feasibility Assessment ◽  
Range Extender ◽  
Component Design ◽  
History Of ◽  
And Control

The paper presents a comprehensive review of the gas turbine hybrid vehicle (GTHV) under development at the University of Roma “Sapienza.” A GHTV is an electric vehicle (traction entirely electric on 1 or 2 axles) equipped with a small turbogas operating as a range extender and –when needed- as a recharger for other auxiliaries. After a brief review of the history of the GTHV technology, a few configurations proposed in the past by different Authors are described and critically analyzed. Then, a complete feasibility assessment of a prototype configuration of a GTHV is presented and discussed in detail. Two possible implementations are studied: one for a small city car (peak power 4–8 kW) and one for a sport GT or passenger sedan (50–100 kW). All issues related to the system and component design, packaging, identification of the “optimal” hybridization ratio, performance of the conversion chain (gas turbine + batteries + electrical motor), kinetic energy recovery systems (KERS), mechanical and electric storage devices (flywheels, capacitors, advanced batteries), monitoring and control logic, compliance with the European vehicular ECE emission regulations, are explicitly addressed. One of the most important results of this analysis is though that there are several “nearly optimal” solutions and the final choice for a possible future industrialization would be dictated by manufacturing, commercial or marketing considerations. It because not only the system performance, but also the absolute and relative sizes (i.e., nameplate power) of the turbines and of the battery package depend substantially on the type of driving mission the car is required to perform. In the paper, both theoretical and practical issues are addressed, and on the basis of the analysis of the existing state of the art, it is argued that the GTHV is an environmentally friendly, technically and economically feasible product based on mature components.

scholarly journals The «I—Other» Relations in One Special Situation of Communication

2015 ◽  
Vol 23 (5) ◽  
pp. 290-306
Author(s):  
A.N. Krichevets ◽  
M.V. Solodushkina
Keyword(s):  
Group Leader ◽  
Self Control ◽  
The Other ◽  
Special Situation ◽  
Other Hand ◽  
The Individual ◽  
And Control

The individual ways of the stutter correction group participants are considered in the article. We see this situation as difficult and even antinomical for participant because it requires the his partial rejection of self-control and a trust in handing over his consciousness to the group leader. We assume that this aspect of communication is expressed only stronger in the situation considered here, but is presented in all kinds of communication. On the other hand, not only psychology, but also our culture lacks in adequate measures for understanding and control of such a processes in the communication. Our analysis of participant’s interviews shows that the participant’s way in the correctional process depends on ones attitudes towards the problem of handing control over one’s condition to the group leader.

scholarly journals Natural Gas

2011 ◽  
Vol 133 (04) ◽  
pp. 52-52
Author(s):  
Rainer Kurz
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Oil And Gas ◽  
Electrical Power ◽  
Offshore Platforms ◽  
Electric Motors ◽  
Turbine Generator ◽  
Associated Gas ◽  
Generator Sets

This article discusses the importance of gas turbines, centrifugal compressors and pumps, and other turbomachines in processes that bring natural gas to the end users. To be useful, the natural gas coming from a large number of small wells has to be gathered. This process requires compression of the gas in several stages, before it is processed in a gas plant, where contaminants and heavier hydrocarbons are stripped from the gas. From the gas plant, the gas is recompressed and fed into a pipeline. In all these compression processes, centrifugal gas compressors driven by industrial gas turbines or electric motors play an important role. Turbomachines are used in a variety of applications for the production of oil and associated gas. For example, gas turbine generator sets often provide electrical power for offshore platforms or remote oil and gas fields. Offshore platforms have a large electrical demand, often requiring multiple large gas turbine generator sets. Similarly, centrifugal gas compressors, driven by gas turbines or by electric motors are the benchmark products to pump gas through pipelines, anywhere in the world.

scholarly journals Hydromechanical Fuel Control for Portable Gas Turbine Generator Sets

1968 ◽  
Author(s):  
G. E. Parker
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Production Cost ◽  
Light Weight ◽  
Turbine Generator ◽  
Design Problems ◽  
Ambient Temperatures ◽  
High Speeds ◽  
Wide Range ◽  
Generator Sets

Controls for small lightweight gas turbines present some unique design problems. The requirements for small size, light weight, ability to rotate at high speeds to save reduction gearing, and low production cost conflict with the requirements for reasonably accurate control of very small fuel flows and the scheduling of a wide range of hydrocarbon fuels over a wide range of ambient temperatures. This paper discusses in some detail the design of such a control and the satisfactory results obtained.

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