Orlando, FL, United States
Orlando, FL, United States

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Usune Y.,Mitsubishi Group | Terazaki M.,Mitsubishi Group | Tomita Y.,Mitsubishi Group | Lee J.-H.,Mitsubishi Power Systems Americas
Power Engineering (Barrington, Illinois) | Year: 2011

Some of the processes and technologies which are applied to achieve higher availability of gas turbine combined cycle are discussed. The use of remote monitoring systems has proven to be an effective tool for early detection of potential problems. Gas turbine upgrades are found to provide valuable solutions for power generation users to counter the negative effects of thermal performance degradation. It is also essential to ensure performance and reliability by long-term verification after laboratory tests have been conducted. Communication between the outage site and the Gas Turbine Engineering Service Department is found to have been vastly improved by using an Internet system. A four-pronged approach for achieving higher availability and reliability include robust design utilizing the field data gathered during the scheduled outages, efficient scheduled outage management with lessons learnt, proactive intervention with remote monitoring technology, and improved design and upgrade for extended parts life.


DeMarco J.,Mitsubishi Power Systems Americas | Karl J.,Mitsubishi Power Systems Americas | Sohn Y.,Mitsubishi Power Systems Americas | Gordon A.P.,Mitsubishi Power Systems Americas
Materials at High Temperatures | Year: 2013

Aluminum metal-matrix composites are lightweight materials that have the potential to supplant steel in many applications. The current work helps to identify the parameters that confer maximal strength and ductility. Torsion tests were performed on the as-cast aluminum metal-matrix composite A359-SiCp- 30% at a variety of temperatures and twist rates. Dependence of material properties on temperature and strain rate were identified from equivalent stress-strain curves constructed from the reduced data. Examination of the microstructure was performed on the as-cast material and on fracture surfaces. A temperature- and strain rate-dependent constitutive model was applied to simulation of the mechanical response of the torsion specimen. Trends in material properties corroborate and extend trends identified previously under tensile loading with regard to temperature and strain rate dependence. Shear properties of simulated specimens agree with properties obtained through experimentation.


DeMarco J.,Mitsubishi Power Systems Americas | Karl J.,Mitsubishi Power Systems Americas | Sohn Y.,Mitsubishi Power Systems Americas | Gordon A.P.,Mitsubishi Power Systems Americas
Materials at High Temperatures | Year: 2013

Lightweight, nano-structured aluminum metal-matrix composites (MMCs) have been identified as a next-generation armoring material due to their low density and high strength. The properties of A359- SiCp-30% are investigated here, with the aim of reducing material loss to edge cracking during the hot rolling process through characterization of the deformation and rupture behavior at high temperatures and moderate strain rates. Multiaxial isotropic constitutive equations designed for modeling the thermomechanical processing response of a lightweight MMC are developed. The model incorporates both strain rate and temperature dependence of the inelastic response. Tensile tests were performed on A359-SiCp-30% samples to validate the model. By means of a finite element analysis, the constitutive model was applied to simulate the tensile response, and a strong correlation with the experimental data was achieved. Metallurgical analyses were carried out on tensile-tested samples to determine the microstructural mechanisms leading to tensile rupture.

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