Accession Number:

ADA169552

Title:

MMU (Manned Maneuvering Unit) Task Simulator.

Descriptive Note:

Final rept. Jun 85-Jan 86,

Corporate Author:

AIR FORCE ACADEMY CO

Personal Author(s):

Report Date:

1986-01-15

Pagination or Media Count:

80.0

Abstract:

This paper describes simplified mathematical models of the Manned Maneuvering Unit MMU used in the USAFA Proximity Operations Simulator for the VAX 11780 and the Evans and Sutherland PS 300 computers. This simulator serves as a learning aid for cadets studying orbital dynamics and MMU mission planning and as a research platform for the Department of Astronautics. The Manned Maneuvering Unit MMU Proximity Operations Simulator is a nine degrees-of-freedom trajectory integrator six degrees of freedom for the MMU and three degrees of freedom for the target which generates digital and graphical data to describe relative motion of the MMU and a free-flying target. This motion is obtained by applying the Clohessy-Wiltshire equations for terminal rendezvousdocking with the earth modeled as a uniform sphere and aerodynamic forces ignored. MMU position relative to target is computed by a first-order Euler integrator which uses quaternions to define the rotational state. The target is modeled as a Space Transportation System STS Orbiter. The MMU is treated as a rigid body whose mass properties gross weight, moments and products of inertia, and center of gravity location are set within the program and remain constant for the entire simulation.

Subject Categories:

  • Astronautics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE