Title page for ETD etd-43489759651581

Type of Document

Master's Thesis

Author

MacMillin, Peter Edward

URN

etd-43489759651581

Title

Trim, Control, and Performance Effects in Variable-Complexity High-Speed Civil transport Design

Degree

Master of Science

Department

Aerospace and Ocean Engineering

Advisory Committee

Advisor Name	Title
Grossman, Bernard M.
Lutze, Frederick H. Jr.
Mason, William H.	Committee Chair

Keywords

none

Date of Defense

1996-05-01

Availability

unrestricted

Abstract

Numerous trim, control requirements and

mission generalizations have been made to our

previous multidisciplinary design methodology

for a high speed civil transport. We optimize

the design for minimum take off gross weight,

including both aerodynamics and structures to

find the wing planform and thickness

distribution, fuselage shape, engine placement

and thrust, using 29 design variables. While

adding trim and control it was found necessary

to simultaneously consider landing gear

integration. We include the engine-out and

crosswind landing requirements, as well as

engine nacelle ground strike for

lateral-directional requirements. For

longitudinal requirements we include

nose-wheel lift-off rotation and approach trim

as the critical conditions. We found that the

engine-out condition and the engine nacelle

ground strike avoidance were critical

conditions. The addition of a horizontal tail to

provide take-off rotation resulted in a

signiffcant weight penalty, and that penalty

proved to be sensitive to the position of the

landing gear. We include engine sizing with

thrust during cruise and balanced field length

conditions. Both the thrust during cruise and

balanced field length constraints were critical.

We include a subsonic leg in our mission

analysis. The addition of a subsonic mission

requirement also results in a large weight

penalty.

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