Issue 10 Volume 41 May 16, 2003

20030032531 NASA Langley Research Center, Hampton, VA, USA
Avionic Pictorial Tunnel-/Pathway-/Highway-In-The-Sky Workshops
Parrish, Russell V., Compiler; March 2003; 112 pp.; In English; Avionic Pictorial Tunnel-/Pathway-/Highway-In-The-Sky
Workshop #1, 25-27 Apr. 1994, Hampton, VA, USA; Original contains black and white illustrations
Contract(s)/Grant(s): 728-60-10-01
Report No.(s): NASA/CP-2003-212164; L-18270; NAS 1.55:212164; No Copyright; Avail: CASI; A06, Hardcopy
In 1994-96, Langley Research Center held a series of interactive workshops investigating highway-in-the-sky concepts,
which enable precise flight path control. These workshops brought together government and industry display designers and
pilots to discuss and fly various concepts in an iterative manner. The primary emphasis of the first workshops was the utility
and usability of pathways and the pros and cons of various features available. The final workshops were focused on the specific
applications to the eXternal Visibility System (XVS) of the NASA High-speed Research Program, which was concerned with
replacement of the forward windows in a High-speed Civil Transport with electronic displays and high resolution video
cameras to enable a ‘No-Droop’ configuration. The primary concerns in the XVS application were the prevention of display
clutter and obscuration of hazards, as the camera image was the primary means of traffic separation in clear visibility
conditions. These concerns were not so prominent in the first workshops, which assumed a Synthetic Vision System
application in which hazard locations are known and obscuration is handled easily. The resulting consensus concept has been
used since in simulation and flight test activities of many Government programs. and other concepts have been influenced by
the workshop discussions.
Author
Avionics; Display Devices; Flight Paths; Flight Control; Enhanced Vision; Civil Aviation; Flight Simulation
20030032933 NASA Glenn Research Center, Cleveland, OH, USA, Texas Univ., Edinburg, TX, USA
A Reduced Model for Prediction of Thermal and Rotational Effects on Turbine Tip Clearance
Kypuros, Javier A.; Melcher, Kevin J.; March 2003; 32 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): 22-708-87-06
Report No.(s): NASA/TM-2003-212226; NAS 1.15:212226; E-13846; No Copyright; Avail: CASI; A03, Hardcopy
This paper describes a dynamic model that was developed to predict changes in turbine tip clearance the radial distance
between the end of a turbine blade and the abradable tip seal. The clearance is estimated by using a first principles approach
to model the thermal and mechanical effects of engine operating conditions on the turbine sub-components. These effects are
summed to determine the resulting clearance. The model is demonstrated via a ground idle to maximum power transient and
a lapse-rate takeoff transient. Results show the model demonstrates the expected pinch point behavior. The paper concludes
by identifying knowledge gaps and suggesting additional research to improve the model.
Author
Scale Models; Temperature Effects; Turbine Blades; Mathematical Models; Dynamic Models; Clearances; Blade Tips
20030032958 Georgia Inst. of Tech., Atlanta, GA, USA
150 Passenger Commercial Aircraft
Bucovsky, Adrian; Romli, Fairuz I.; Rupp, Jessica; December 09, 2002; 221 pp.; In English; Original contains color
illustrations
Contract(s)/Grant(s): NAG1-2235
Report No.(s): AE-880-04A-7; No Copyright; Avail: CASI; C01, CD-ROM; A10, Hardcopy
It has been projected that the need for a short-range mid-sized, aircraft is increasing. The future strategy to decrease
long-haul flights will increase the demand for short-haul flights. Since passengers prefer to meet their destinations quickly,
airlines will increase the frequency of flights, which will reduce the passenger load on the aircraft. If a point-to-point flight
is not possible, passengers will prefer only a one-stop short connecting flight to their final destination. A 150-passenger aircraft
is an ideal vehicle for these situations. It is mid-sized aircraft and has a range of 3000 nautical miles. This type of aircraft
would market U.S. domestic flights or inter-European flight routes. The objective of the design of the 150-passenger aircraft
is to minimize fuel consumption. The configuration of the aircraft must be optimized. This aircraft must meet CO2 and NOx
emissions standards with minimal acquisition price and operating costs. This report contains all the work that has been
performed for the completion of the design of a 150 passenger commercial aircraft. The methodology used is the Technology
Identification, Evaluation, and Selection (TIES) developed at Georgia Tech Aerospace Systems Design laboratory (ASDL).
This is an eight-step conceptual design process to evaluate the probability of meeting the design constraints. This methodology
also allows for the evaluation of new technologies to be implemented into the design. The TIES process begins with defining
the problem with a need established and a market targeted. With the customer requirements set and the target values
9