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Spin stabilization in the geostationary orbit. The spin axis lies along the pitch axis, parallel to the earth s N-S axis.

overall effect is that the spin rate will decrease, and the direction of the angular spin axis will change Impulse-type thrusters, or jets, can be used to increase the spin rate again and to shift the axis back to its correct N-S orientation Nutation, which is a form of wobbling, can occur as a result of the disturbance torques and/or from misalignment or unbalance of the control jets This nutation must be damped out by means of energy absorbers known as nutation dampers Where an omnidirectional antenna is used (eg, as shown for the INTELSAT I and II satellites in Fig 11), the antenna, which points along the pitch axis, also rotates with the satellite Where a directional antenna is used, which is more common for communications satellites, the antenna must be despun, giving rise to a dual-spin construction.

An electric motor drive is used for despinning the antenna subsystem Figure 76 shows the Hughes HS 376 satellite in more detail The antenna subsystem consists of a parabolic reflector and feed horns mounted on the despun shelf, which also carries the communications repeaters (transponders) The antenna feeds can therefore be connected directly to the transponders without the need for radiofrequency (rf) rotary joints, while the complete platform is despun Of course, control signals and power must be transferred to the despun section, and a mechanical bearing must be provided The complete assembly for this is known as the bearing and power transfer assembly (BAPTA) Figure 77 shows a photograph of the internal structure of the HS 376 Certain dual-spin spacecraft obtain spin stabilization from a spinning flywheel rather than by spinning the satellite itself.

strLinetypeName = InputBox("Enter the Linetype name: ") If "" = strLinetypeName Then Exit Sub ' exit if no old name Set objLinetype = ThisDrawing.Linetypes(strLinetypeName) If objLinetype Is Nothing Then ' exit if not found MsgBox "Linetype '" & strLinetypeName & "' not found" Exit Sub End If strLinetypeDescription = InputBox("Enter the Linetype description: ") If "" = strLinetypeDescription Then Exit Sub ' exit if no new name

These flywheels are termed momentum wheels, and their average momentum is referred to as momentum bias Reaction wheels, described in the Sec 732, operate at zero momentum bias In the Intelsat series of satellites, the INTELSAT-VI series spacecraft are spin-stabilized, all the others being 3-axis stabilized (body stabilized) through the use of momentum wheels..

HS 376 spacecraft. (Courtesy of Hughes Aircraft Company Space and Communications Group.)

In the previous section the gyroscopic effect of a spinning satellite was shown to provide stability for the satellite attitude. Stability also can be achieved by utilizing the gyroscopic effect of a spinning flywheel, and this approach is used in satellites with cube-like bodies (such as shown in Fig. 7.2, and the INTELSAT V type satellites shown in Fig. 1.1). These are known as body-stabilized satellites. The complete unit, termed a momentum wheel, consists of a flywheel, the bearing assembly, the casing, and an electric drive motor with associated electronic control circuitry. The flywheel is attached to the rotor, which consists of a

Note that as the individual consumes more units of X, TUx increases. Columns 1 and 3 of the table give this individual s marginal utility (MU) schedule for commodity X. Each value of column 3 is obtained by subtracting two successive values of column 2. For example, if the individual s consumption of X rises from 1 unit to 2 units, TUx rises from 10 to 18, and the MU of the second unit of X is 8.

Figure 7.7 Technicians check the alignment of the Telestar 3 communications satellite, shown without its cylindrical panels. The satellite, built for the American Telephone and Telegraph Co., carries both traveling-wave tube and solid-state power amplifiers, as shown on the communications shelf surrounding the center of the spacecraft. The traveling-wave tubes are the cylindrical instruments. (Courtesy of Hughes Aircraft Company Space and Communications Group.)