NASA Technical Reports Server (NTRS) : Automated pdf

NASA Technical Reports Server (NTRS) : Automated_bookcover

NASA Technical Reports Server (NTRS) : Automated

More Book Details

Description of the Book:

Calculating an accurate nutation time constant (NTC), or nutation rate of growth, for a spinning upper stage is important for ensuring mission success. Spacecraft nutation, or wobble, is caused by energy dissipation anywhere in the system. Propellant slosh in the spacecraft fuel tanks is the primary source for this dissipation and, if it is in a state of resonance, the NTC can become short enough to violate mission constraints. The Spinning Slosh Test Rig (SSTR) is a forced-motion spin table where fluid dynamic effects in full-scale fuel tanks can be tested in order to obtain key parameters used to calculate the NTC. We accomplish this by independently varying nutation frequency versus the spin rate and measuring force and torque responses on the tank. This method was used to predict parameters for the Genesis, Contour, and Stereo missions, whose tanks were mounted outboard from the spin axis. These parameters are incorporated into a mathematical model that uses mechanical analogs, such as pendulums and rotors, to simulate the force and torque resonances associated with fluid slosh

  • Creator/s: NASA Technical Reports Server (NTRS
  • Date: 3/3/2008
  • Year: 2008
  • Book Topics/Themes: NASA Technical Reports Server (NTRS), LIQUID SLOSHING, MATHEMATICAL MODELS, NUTATION, SPACECRAFT STABILITY, SPIN STABILIZATION, ENERGY DISSIPATION, COMPUTERIZED SIMULATION

An excerpt captured from the PDF book

NASA Technical Reports Server (NTRS) : Automated_book-excerpt

Report Broken Link

File Copyright Claim

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Categories

You might be also interested in these Books

Related Posts
PDF Viewer

الرجاء الانتظار بينما يتم تحميل الـ PDF…
HTML Popup Example