Aerospace & Aviation

Reliability of hydraulic control systems of space vehicles

Achievement of reliability in spacecraft

The AFSC Program Structure assigns numbers and letters to the various programs in order to identify the efforts for management control. The fact that most of the command and control systems have the designator "L" affixed has prompted the reference to them as the "L" systems. In this paper the mission of "L" systems has been described, the complexity of the equipment indicated, and the importance of these systems to our national defense efforts pointed out. The efforts by the Electronic Systems Division to comply With the Air Force policy that a comprehensive reliability program be required for each contract to assure delivery of reliable systems and equipment to the Air Force inventory are described in considerable detail.

Needs in reliability research

Economic feasibility of reliability testing

Reliability testing and considerations in design of missile systems and space projects - missile & space reliability symposium, 1962.

Cylindrical shell buckling under dynamic pressure

Singular orbits of earth-moon satellites with high area-mass ratio

The Orbiting Astronomical Observatory (OAO) is designed to provide an accurately stabilized, unmanned platform for astronomical observations from well above the earth's atmosphere. Of primary immediate interest is the observation of stellar radiation in the ultraviolet range, which is severely limited even in balloon experiments because of absorption in the ozone layers. The OAO is a 3600-pound spacecraft that will be placed in orbit by an Atlas Agena D. It can handle optical systems up to 48 inches in diameter, 10 feet in length, weighing 1000 pounds. The key design requirements of the spacecraft are discussed. The reasons behind the configuration are then explained, followed by a discussion of the major subsystems showing how they have been designed to meet the exacting requirements astronomical observation.

Objectives of orbiting solar observatories - oso i results, advanced oso i /helios/ solar flare mission

Objectives of orbiting geophysical observatory satellites - eccentric orbiting & polar orbiting missions

Orbiting observatory satellites - orbiting solar observatories, orbiting geophysical observatories, and orbiting astronomical observatories

A series of experiments designed to study the nuclear cascade resulting from the passage of 1 to 3 GeV protons in matter has been in progress at the Brookhaven Cosmotron. Preliminary results on the fluxes of fast neutrons (upper limits) and of strongly interacting particles above 50 MeV are summarized here (Fig. 1 and Table 1). The four cases studied are: 1-GeV protons on Fe, on chondritic material, and on C5H8O2, and 3-GeV protons on Fe.

Radiation dose rates have been calculated for six electron spectra. The decrease in dose rate with shielding was determined -- and in each case the electron does becomes insignificant with 2 to 6 gm/cm2 of aluminum. Electron bremsstrahlung doe rates versus absorber thickness were also calculated. Detailed dosage calculations for an Apollo-type spacecraft were made and mission dosages for four lunar trajectories are given, to show the effects of trajectory selection. These are compared with the dosages from protons and secondary neutrons in the Van Allen Belt. Doses as a function of orbital altitude, of inclination and of absorber thickness are also presented for the latest version of the inner belt.