Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"laser drilling"”.
-
An investigation of laser drilling variation and the application of a knowledge management framework
… One such process employed at Alstom Power is the laser drilling holes in gas turbine blades and vanes. The complexity of such advanced manufacturing techniques requires a disciplined approach toward process improvement. In addition, manufacturing knowledge management systems must be put in place …
-
Annular Beam Shaping And Optical Trepanning
Percussion drilling and trepanning are two laser drilling methods. Percussion drilling is accomplished by focusing the laser beam to approximately the required diameter of the hole, exposing the material to one or a series of laser pulses at the same spot to melt and vaporize the material. Drilling …
-
A theoretical analysis of combined melting and vaporization using the boundary element method
… A comparison is made to existing data from a laser drilling experiment. The anticipated physical effects which occur on semi-infinite and finite domains arc confirmed. Consequently, this method can be used to model natural and industrial phenomena involving phase change.
-
Development of planar patch clamp with potentiometric calcium ion-selective electrode
… in an <em>in vitro</em> format. Femtosecond laser-drilling technique is newly introduced to fabricate the patch-pore and new design of planar ion-selective electrode is suggested for calcium ion measurement. By integrating a standard patch clamp electrophysiological interface with calcium …
-
Aerodynamic performance measurements of a film-cooled turbine stage
… film-cooling hole geometry was created using a laser drilling process to produce the required 43,000 cooling holes. The film-cooled stage was then tested over a range of operating conditions (pressure ratios and corrected speeds) and over a range of coolant-to-mainstream mass flow and …
-
Anode Materials for High Power Microwave Devices
… highly focused energy sources, including lasers, particle beams and microwaves. Extensive research is continuingly conducted into such devices’ frequency spectrum in order to increase their power levels to develop new applications. However, one area of the directed energy technology has …
-
Aerodynamic performance measurements of a fully scaled, film-coated, turbine stage
… was machined via electro-discharge machining, laser drilling, and laser welding to provide film-cooling holes and manifold channels. The effective area (CdA) of the film-cooling holes was measured and part-to-part variations quantified. A coolant feed system was constructed to provide coolant …
-
Numerical modeling of laser-induced melting and drilling of bulk and powder metals using combined smoothed particle hydrodynamics and ray tracing method
… multiple reflections and absorption of incident laser radiation. The SPH-RT method is used to investigate the melt pool expulsion mechanism during high aspect ratio laser drilling of aluminum, and 316L stainless steel bulk targets. The drilling velocity is found to be non-linear which is …
-
A Detailed Study of Fan-Shaped Film-Cooling for a Nozzle Guide Vane for an Industrial Gas Turbine
… electrical discharge machining instead of the laser drilling used for cylindrical holes. This research focused on examining the performance of fan-shaped holes on two critical turbine surfaces; the vane and endwall. This research was the first to offer a complete characterization of …