SIMULATION: Transactions of The Society for Modeling and Simulation International

Belpedio, Ron

doi: 10.1177/003754979105700101pmid: N/A

Wildberger, A. Martin

doi: 10.1177/003754979105700102pmid: N/A

doi: 10.1177/003754979105700103pmid: N/A

Fishwick, Paul

doi: 10.1177/003754979105700104pmid: N/A

This column focuses on a single topic within the field of computer simulation. All the material comes directly from the electronic news group (bulletin board) called Simulation Digest. The Digest can be obtained over INTERNET by accessing the news group 'comp.simulation' or by sending e-mail to: '[email protected]'

Lawrence, James A.; Smith, H. Edward

doi: 10.1177/003754979105700105pmid: N/A

Presently, the Space Exploration Initiative has captured the attention of the manned space community. The approach to the accomplishment of such a demanding mission causes recall of the development of the Apollo mission, the synergism with the SEI, and the role that JSC's Engineering Simulations took in the Lunar Landing systems definition and development.

Pope, Tonya

doi: 10.1177/003754979105700106pmid: N/A

Software in the Systems Engineering Simulator at NASA's Johnson Space Center must be updated frequently to insure reliability and accuracy of the simulation. The Attitude Control System of the Space Station Freedom is one large component of the station simulation which must likewise undergo upgrades and maintenance. The baseline McDonnell Douglas Space Systems Co. (MDSSC)/Honeywell Attitude Control System has been integrated into the laboratory as a new system rather than modifying the older, existing version. Because this was replacing the older version, testing and verification were simplified as the existing task interfaces could be retained. This prevented many errors while at the same time provided a realistic capability for the laboratory.

Cook, John; Wicks, David

doi: 10.1177/003754979105700107pmid: N/A

This paper describes the application of johnson Space Center's Systems Engineer ing Simulator to model a complex spacecraft rendezvous and capture scenario. In this real-time scenario, an operator in one space vehicle made use of a telerobotic manipulator to capture and berth another, smaller vehicle. The goals of the study were to determine if the task could be reliably completed and to provide design and performance data on the manipulator.The study results demonstrate that it is feasible to use a telerobotic manipulator to berth an incoming Shuttle to Space Station Freedom.

Veerasamy, Sam; Hubbard, Joseph

doi: 10.1177/003754979105700108pmid: N/A

A real-time pilot-in-the-loop berthing simulator is being developed at NASA/JSC (National Aeronauticsand Space Administration/Lyndon B. Johnson Space Center) to conduct a berthing study and to measure forces during contact conditions of the actual docking hardware mechanisms or ports for the Space Station Freedom (SSF) and the Space Shuttle (shuttle). In berthing, the docking ports of the SSF and the shuttle are brought together using the shuttle Remote Manipulator System (RMS) to control the relative motion of the vehicles. The berthing simulator consists ofa dynamic docking test system (DDTS), computer system, simulator software, and RMS workstation. During the real-time berthing simulation, the docking ports of the SSFand the shuttle, mounted on a six- degree-of-freedom (6 DOF) table of the DDTS and a fixed platform above the table, are brought together by a computer simulated 6 DOF shuttle RMS. Load cells are used on the fixed platform to measure forces during contact conditions of the docking ports. The point of resolution (POR) of the shuttle RMS is selected as the SSF docking port. The dynamic initialization, developed to synchronize the POR with the 6 DOF table, the data structure, and the real-time sequence of the berthing simulation are briefly described in this paper. The berthing test can be extended for any two orbiting vehicles, using a simulated RMS.

Jensen, Mary C.; Hines, J. Matt; Foale, C. Michael

doi: 10.1177/003754979105700109pmid: N/A

The purpose of this paper is to examine the Manned Maneuvering Unit (MMU) Rescue Study that is being conducted in the Systems Engineering Simulator (SES) at the Johnson Space Center, Houston, Texas. The study explores the possibility of rescuing a man-overboard from the Space Station Freedom (SSF) using the MMU. The details of the study as well as some of the interesting problems that arise are discussed and a mathematical development of the equations that govern the behavior of two orbiting bodies is included.

doi: 10.1177/003754979105700110pmid: N/A