An analytical and experimental investigation of the effect of vibration on the retention characteristics of screen acquisition systems was performed. The functioning of surface tension devices using fine-mesh screens requires that the pressure differential acting on the screen be less than its pressure retention capability. When exceeded, screen breakdown will occur and gas-free expulsion of propellant will no longer be possible. An analytical approach to predicting the effect of vibration was...
Topics: NASA Technical Reports Server (NTRS), SCREENING, STRUCTURAL VIBRATION, INTERFACIAL TENSION,...
Analytical procedures and digital computer code are presented for the dynamic analysis of a flexible spacecraft with rotating components. Topics, considered include: (1) nonlinear response in the time domain, and (2) linear response in the frequency domain. The spacecraft is assumed to consist of an assembly of connected rigid or flexible subassemblies. The total system is not restricted to a topological connection arrangement and may be acting under the influence of passive or active control...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DYNAMIC STRUCTURAL ANALYSIS, FLEXIBLE...
For abstract, see N76-10204.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DYNAMIC STRUCTURAL ANALYSIS, FLEXIBLE...
For abstract, see N76-10204.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DYNAMIC STRUCTURAL ANALYSIS, FLEXIBLE...
The dynamics of liquid propellant in a low Bond number environment which are critical to the design of spacecraft systems with respect to orbital propellant transfer and attitude control system were investigated. Digital computer programs were developed for the determination of liquid free surface equilibrium shape, lateral slosh natural vibration mode shapes, and frequencies for a liquid in a container of arbitrary axisymmetric shape with surface tension forces the same order of magnitude as...
Topics: NASA Technical Reports Server (NTRS), FINITE ELEMENT METHOD, LIQUID ROCKET PROPELLANTS, LIQUID...
For abstract, see N78-25123.
Topics: NASA Technical Reports Server (NTRS), ATTITUDE CONTROL, COMPUTERIZED SIMULATION, SPACECRAFT...
A theoretical development and associated digital computer program system for the dynamic simulation and stability analysis of passive and actively controlled spacecraft are presented. The dynamic system (spacecraft) is modeled as an assembly of rigid and/or flexible bodies not necessarily in a topological tree configuration. The computer program system is used to investigate total system dynamic characteristics, including interaction effects between rigid and/or flexible bodies, control...
Topics: NASA Technical Reports Server (NTRS), ATTITUDE CONTROL, COMPUTERIZED SIMULATION, SPACECRAFT...