scholarly journals Gears Steer New Engine Designs

2017 ◽  
Vol 139 (09) ◽  
pp. 54-55 ◽  
Author(s):  
Lee S. Langston
Keyword(s):  
General Public ◽  
Mechanical Engineering ◽  
First Generation ◽  
Reduction Ratio ◽  
Engineering Technology ◽  
Jet Engine ◽  
Gear Trains ◽  
Passenger Aircraft ◽  
Bypass Ratio

This article reviews the development of geared turbofan (GTF) engines. GTF engines have a hub-mounted epicyclic gearbox that drives the front-mounted fan at lower rotational speeds than the engine turbine section that powers the fan. The turbine driving the fan is most efficient at high-rotational speeds. The fan operates most efficiently and creates less noise at lower rpm. The operating gear reduction ratio also permits increasing the engine’s bypass ratio with larger fans. Gear trains are one of the oldest known machines, and none is more closely identified by the general public with the profession of mechanical engineering. Pratt & Whitney is in production of their first generation of GTF engines in the 18,000–30,000 lbt range, which power twin engine single-aisle, narrow body 70–200 passenger aircraft. The GTF combines existing jet engine technology with the well-established mechanical engineering technology of gears.

scholarly journals Not So Simple Machines

2013 ◽  
Vol 135 (01) ◽  
pp. 30-35
Author(s):  
Lee S. Langston
Keyword(s):  
Gas Turbines ◽  
Jet Engines ◽  
Engineering Technology ◽  
Commercial Aviation ◽  
Jet Engine ◽  
Simple Machines ◽  
History Of ◽  
Extensive Program ◽  
Four Square ◽  
Bypass Ratio

This article talks about evolving technologies in making efficient gears for different auto engines. Gears are integral to a new engine that has the potential to change commercial aviation. Pratt & Whitney’s geared turbofan (GTF) jet engine will have significantly better fuel economy and much quieter operation. The P&W GTF combines existing jet engine technology with the well-established mechanical engineering technology of gears. Due to its high bypass ratio, the geared turbofan engine is 16% more efficient than standard jet engines. A key facility for developing the GTF gearbox has been a specially designed four-square gear test rig at P&W’s Middletown plant. The orientation of the GTF test gearboxes can be adjusted with respect to gravity to simulate different flight conditions. After an extensive program using a four-square rig and a long history of gearbox experience associated with their very popular turboprop gas turbines at Pratt & Whitney Canada, P&W engineers are convinced their new GTF engines will have a bright future.

LabVIEW and Measure Foundry Based Data Acquisition System for Mechanical Engineering Technology Laboratories

2013 ◽  
Author(s):  
Emin Yilmaz
Keyword(s):  
Data Acquisition ◽  
Tensile Testing ◽  
Mechanical Engineering ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Materials Testing ◽  
Engineering Technology ◽  
Computer Data ◽  
Data Translation ◽  
Application Programs

Since the ASYST data acquisition and analysis software was discontinued and the old versions of ASYST do not support new computer operating systems and new data acquisition boards, old computer data acquisition (CDAQ) system is being replaced with a new data acquisition system. The new microcomputer based data acquisition system consists of an i-3 microcomputer with 3.0 GHz CPU and Windows-7 operating system, a Data Translation (DT) DT-304, 12-bit, 400 MHz data acquisition board with STP-300 screw terminal, Data Translation Measure Foundry (DT-MF) software and DT-LV link software [2], a National Instruments (NI) PCI-6250, M-series, low level, 16-bit, 1.25 MS/s board with 4-module SCC-68 I/O Connector Block, four thermocouple-input plug-in modules and NI LabVIEW (NI-LV) software [4]. Data Translation’s DT-LV software links DT boards with NI-LV software. Most ASYST-based data acquisition and analysis application programs used in Mechanical Engineering Technology (MET) courses have been converted to NI-LV and DT-MF application programs. Purpose of this paper is to describe how our old data acquisition application programs were converted to new data acquisition application programs so that they may be used with our new data acquisition system. Descriptions of the experiments, equipment used, and experiences gained with laboratory experiments are given elsewhere [8–13]. Specifically: Reference [8] covers upgrades made to the Materials Testing Laboratory, including Tinius-Olsen [14] tensile testing machine; reference [9] covers design and development of data acquisition programs for the materials testing, including Tensile Testing of Materials experiment; references [11] and [12] cover Heating Ventilating and Air Conditioning (HVAC) experiments and use of DAQ system in these experiments; reference [13] cover all uses of DAQ system in MET at University of Maryland Eastern Shore (UMES).

Automation of the technology of connecting parts in the manufacture of aerospace products

2021 ◽  
pp. 24-32
Author(s):  
S. I. Ponomarev
Keyword(s):  
Technological Process ◽  
Computer Aided Design ◽  
Mechanical Engineering ◽  
Experimental Studies ◽  
Diffusion Welding ◽  
Technological Equipment ◽  
State University ◽  
Engineering Technology ◽  
Heat Resistant ◽  
Aided Design

The paper describes the improvement of the technology of manufacturing parts and components of aerospace production using computer-aided design and technological process control. The theoretical foundations and algorithms for constructing the technological process of manufacturing parts and components of the aerospace industry using various methods of joining heat-resistant materials, for example, by diffusion welding, are designed on the basis of theoretical and experimental studies proposed by the author of the patented connection method «Method for joining a heat-resistant cobalt-based alloy with silicon nitride-based ceramics» and technological equipment «Installation for obtaining metal-ceramic products», as well as «Attribute database for creating technological processes for obtaining parts of aerospace production by diffusion welding» and «Attribute database of technological equipment, tools and devices for mechanical processing of aerospace production parts», registered in the register of databases of the Russian Federation. The research is conducted at the Department of Mechanical Engineering Technology of the Institute of Mechanical Engineering and Mechatronics of the Siberian State University of Science and Technology named after academician M.F. Reshetnev.

Land Transportation

2021 ◽  
pp. 311-350
Author(s):  
Thomas H. Fehring ◽  
Terry S. Reynolds
Keyword(s):  
Mechanical Engineering ◽  
First Generation ◽  
The United States ◽  
Late Nineteenth Century ◽  
Long Distance ◽  
Long Distance Transport ◽  
Primary Means ◽  
History Of ◽  
Late Nineteenth ◽  
Distance Transport

The engineering involved in transportation provided one of the points from which the modern mechanical engineering profession in the United States emerged. The shops that produced the steam engines for river boats and the locomotives for railroads had, by the 1840s, become a leading training ground for the first generation of professional mechanical engineers. As railroads became the primary means of long-distance transport for goods in the late nineteenth century, they also became a leading employer of mechanical engineers. Not surprisingly, the Rail Transportation Division was one of the original eight divisions created when ASME in 1920 adopted a divisional organization; it remains among that organization’s most active divisions. Unfortunately, despite the rail industry’s importance to American history and to the history of mechanical engineering, few articles dealing with the history of this form of land transportation have appeared in Mechanical Engineering magazine over the past fifty years. None were selected for this volume.

scholarly journals Gears Galore!

2013 ◽  
Vol 135 (04) ◽  
pp. 51-54 ◽  
Author(s):  
Lee S. Langston
Keyword(s):  
Fuel Consumption ◽  
Gas Turbines ◽  
Historical Analysis ◽  
Jet Engines ◽  
Efficient Operation ◽  
Jet Engine ◽  
The Status ◽  
The 1960S ◽  
A Company ◽  
Bypass Ratio

This paper presents a review of gas turbines and Honeywell, a company based in Phoenix, history. The article through the review and historical analysis intends to provide perspective on the status of geared fan engines. The addition of a fan to a jet engine, first proposed by Frank Whittle, one of the inventors of the jet engine, increases thrust and reduces fuel consumption. Pratt & Whitney and Rolls Royce were the first to develop a dual spool engine for more efficient operation over a range of flight conditions. Work started on the geared fan TFE731 at the Garrett AiResearch Phoenix Division in 1968. The TFE731 gearbox resulted in a gear reduction of 1.8:1, to power the fan for a 2.5 bypass ratio, which was very high for the 1960s. Honeywell also has another geared turbofan engine, the ALF502. It was developed by AVCO Lycoming in Stratford, Connecticut, and has a 6000–7000 lbt thrust range. Honeywell’s successful 45-year record of producing geared fan small gas turbines gives promise of a bright future for geared fans on large commercial jet engines, providing lower fuel consumption and less noise.

Partnering With Industry on Mechanical Engineering Capstone Projects

2013 ◽  
Author(s):  
Hani S. Saad ◽  
Martin W. Weiser ◽  
Donald C. Richter
Keyword(s):  
Mechanical Engineering ◽  
Engineering Problem ◽  
Engineering Technology ◽  
Capstone Course ◽  
Capstone Courses ◽  
Teachers And Students ◽  
Program Change ◽  
Capstone Projects ◽  
Eastern Washington ◽  
Washington University

The purpose of a Capstone course is to present the students with an engineering problem that needs to be solved. The students work in teams and are expected to document and research each step of the process. The idea is to mimic, as much possible, the situation encountered by engineers in the field. While industry sponsored projects are preferred, suggestions from students are also welcomed. The Mechanical Engineering (ME) and Mechanical Engineering Technology (MET) Department at Eastern Washington University has traditionally pursued industry sponsored projects by reaching out to the local businesses and through the department Industrial Advisory Committee. While the ME degree is a relatively new addition, the MET degree has been offered for many years. With the addition of the ME program, change came to the Capstone course. Emphasis is placed more on research and not on production. The goal now is to create one prototype instead of fifteen while focusing heavily on the research part. This change has an effect on the dynamics of the course and presents additional challenges, especially with industry sponsored projects. These changes are relevant to both the MET and ME Capstone courses. This paper highlights these challenges for four projects done in the spring of 2012 and proposes efficient ways of addressing them. One of these projects was very successful, two were moderately successful, and one was not particularly so. Recommendations for teachers and students on the best ways to approach such a project are also highlighted.

Sign in / Sign up

Export Citation Format

Share Document