Aerospace Control and Guidance Systems Committee

Announcements

You must first log in to access prior meeting presentations, register for a meeting, or nominate some for the Ward Award.

If you do not have a login account, or cannot remember the email address associated with your account, please click on the Application Form link below.

Login

Site Search

Search our site:

Upcoming Events

Photos

Meeting Highlights New!

Subcommittee S

Prior Meetings

Abstracts may be viewed by anyone. Presentations are only available to active members who have logged in.

Meeting 132
(coming soon)

Home

Ward Memorial Award

Planning Advisory Board

Downloads

Constitution and By-Laws

About

History

Contact Us

← Return to agenda

Meeting	ACGS Committee Meeting 109 - Salt Lake City - March 2012
Agenda Location	8 SUBCOMMITTEE B – MISSILES AND SPACE 8.1 NESC Independent Review of the Constellation Program Ares I Control Sensitivity to Orion Service Module (SM) Tank Slosh Dynamics
Title	NESC Independent Review of the Constellation Program Ares I Control Sensitivity to Orion Service Module (SM) Tank Slosh Dynamics
Presenter	Ken Lebsock
Affiliation	Orbital Sciences
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	NESC Independent Review of the Constellation Program Ares I Control Sensitivity to Orion Service Module Propellant Tank Slosh Dynamics Presented by Ken Lebsock In 2010 the NESC performed an assessment of the de-stabilizing impact of the Orion Crew Exploration Vehicle (CEV) Service Module propellant slosh dynamics on the Ares-1 crew launch vehicle Flight Control System (FCS). Concerns had been raised about the Ares-1 boost phase stability and control because the standard frequency-domain synthesis methods could not yield a FCS design with sufficient gain and phase stability robustness margins which also met the performance requirements. The assessment prompted a follow-up investigation into how NASA and industry have historically addressed regions of instability or violations of margin requirements. When stability robustness margin requirements cannot be satisfied using frequency-domain methods, alternative methods are then needed to ensure that deficient stability margins do not present a high-risk of a flight control issue (e.g. loss of control) during the mission. Four of these alternative methods are presented as Lessons Re-Learned.