The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Lechniak, Jason A. - One of the best experts on this subject based on the ideXlab platform.
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LEAPTech/HEIST Experiment Test and Evaluations Lessons Learned
2018Co-Authors: Ginn, Starr R., Clarke, Sean C., Papathakis Kurt, Lechniak, Jason A.Abstract:This presentation is designed to update and enhance NASA's ability to collect, preserve, disseminate, and communicate to decision makers for Distributed Electric Propulsion technologies. Acronyms: LEAPTech/HEIST (Leading Edge Asynchronous Propeller Technology/Hybrid-Electric Integrated Systems Testbed)
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LEAPTech/HEIST Experiment Test and Evaluation Summary
2018Co-Authors: Lechniak, Jason A.Abstract:The Leading Edge Asynchronous Propeller Technology (LEAPTech) project tested the Hybrid-Electric Integrated Systems Testbed (HEIST) and was intended for a general aviation sized aircraft with Distributed Electric Propulsion (DEP) to show large improvements with regards to efficiency, emissions, safety and operating costs. The wing was designed for high loading to improve ride quality and show improved takeoff and landing characteristics. The full-scale test article wing had a 31-foot-span, had integrated electric motors, was mounted on a truck 20 ft. above ground and driven in a simulated flight test environment at various velocities up to 70 miles per hour. The simulated flight test varied primarily angle of attack and flap settings. These tests were conducted to obtain data and verify blown wing performance primarily with regards to lift. The experimental test results are presented
J S Carlton - One of the best experts on this subject based on the ideXlab platform.
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marine Propellers and propulsion
2010Co-Authors: J S CarltonAbstract:Propulsion Technology is a complex, multidisciplinary topic with design, construction, operational and research implications. Bringing together a wealth of disparate information from the field, "Marine Propellers and Propulsion" provides comprehensive and cutting edge coverage to equip marine engineers, naval architects and anyone involved in propulsion and hydrodynamics with the knowledge needed to do the job. Drawing on experience from a long and varied career in consultancy, research, design and technical investigation, author John Carlton breaks the subject into three main sections-hydrodynamic theory, materials and mechanical considerations, and design, operation and performance. Connecting essential theory to practical problems in design, analysis and operational efficiency, "Marine Propellers and Propulsion" is an invaluable resource, packed with hard-won insights, detailed specifications and data. This is the most complete book available on marine Propellers, fully updated and revised, with new chapters on propulsion in ice and high speed Propellers. It gathers together otherwise disparate material on the theory and practice of propulsion Technology from the past 40 years' development, including the latest developments in improving efficiency. It is written by a leading expert on Propeller Technology, essential for students, marine engineers and naval architects involved in propulsion and hydrodynamics.
Cao Liang - One of the best experts on this subject based on the ideXlab platform.
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Propeller Technology and its application in the mri scan of the brain
Information of Medical Equipment, 2006Co-Authors: Cao LiangAbstract:The aim of this study was to assess the application value of Propeller(Periodically Rotated Overlapping ParallEL Lines Enhanced Reconstruction,Propeller)in the MRI scan of the brain. Based on the analysis of the 300 cases of the MRI scan of the brain in ourhospital during May to December 2005, Propeller technique offers a means of reducing motion and metallic artifacts, and improving image quality In the MRI scan of the brain, and can be used as the brain the MRI the normal regulations preface that scan the row.
Zhang Taiping - One of the best experts on this subject based on the ideXlab platform.
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application of mri Propeller Technology in brain artifacts reduction
Chinese Medical Equipment Journal, 2008Co-Authors: Zhang TaipingAbstract:Objective To investigate the value of Periodically Rotated Overlapping Parallel Lines Enhanced Reconstruction (Propeller) in omitting the motion and susceptibility artifacts in head MRI. Methods Thirty nine cases of restless patients and eighteen cases with fixed metal artificial tooth underwent head MRI using T2WI or DWI with Propeller during April and Nov. in 2006 were analyzed respectively. The Propeller images and common MRI images were compared. Results The common images of 39 restless patients were not suitable to diagnosis because of moving artifact and pure imaging quality, while the Propeller T2WI images eliminate the artifact obviously and display the lesion clearly. Susceptibility artifacts were found in 18 patients with artificial tooth in common MRI images, and the artifacts were almost not found in Propeller DWI images and so satisfied the need of diagnoses. Conclusion Propeller T2WI and DWI can remove significantly the motion and susceptibility artifacts, and so acquire images of high resolution, low artifacts, and high quality to satisfy the need of diagnoses.
Thomas Hofmann - One of the best experts on this subject based on the ideXlab platform.
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Marine Propeller design, tests and manufacture
1991Co-Authors: Thomas HofmannAbstract:This thesis presents three aspects of marine Propeller Technology. 1) the theoretical design of small Propellers; 2) some aspects of manufacturing, in particular, Propeller casting; and 3) tests on full scale vessels. Although this work was done in the context of small fishing vessels, most of it is applicable to ships' Propellers in general. -- Two lifting line theory Propeller design programs were written and tested. Their usefulness was demonstrated by using test cases which involved real vessels and experimental test results. Through development of lifting surface corrections, results can be produced, from the lifting line theory which closely approximate experimental test data; also, Propellers for specific vessels have been designed using the new programs. The lifting line methods for Propeller design, as used here, are useful methods for designing Propellers for small vessels for which few propulsive or resistive data are available and for preliminary design of other subcavitating Propellers. -- A 1/5 scale model of the vessel UMV SUGAR was constructed to do a set of model tests: resistance tests; open water Propeller and self propulsion tests; and hot film anemometer wake measurements. Although the model was designed and constructed by the author, the tank testing was done by a visiting post-doctoral fellow, Dr. Shukai Wu. The testing program was done to determine the propulsion and resistance data required for lifting line Propeller design and to compare model and full scale results. A graph of the Taylor wake fraction and thrust deduction fraction as measured from the model are given in the appendix. Complete test results are given in the reference. -- Sea trials were performed to determine vessel propulsive performance of the UM V SUGAR and the MV BECKY A. by using a purpose designed and instrumented Propeller stub shaft. Results from both full scale trials were analysed. These tests confirm previous claims of very poor propulsive efficiency for these vessels. -- A method for commercially producing a Propeller casting was developed. This method did not require the use of a solid pattern to produce the mould. A strickle gear was designed and built to construct Propeller moulds for Propellers up to 24 inches in diameter. An expert system was developed to ensure that casting quality could be maintained through information access on mould design. The system was tested by producing a prototype Propeller mould and casting for a model Propeller.
