Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1983-04-08
1985-05-14
Blix, Trygve M.
Aeronautics and astronautics
Spacecraft
Attitude control
B64G 138
Patent
active
045167460
ABSTRACT:
In a nutation damper system which includes a pendulum (30, 33, 34, 38) swingable at a natural frequency and a block element (35) which cooperates with the pendulum to damp nutations having a nutation frequency, a control member (40) electromagnetically coupled to the pendulum is provided for varying the natural frequency to a forced frequency substantially equal to the nutation frequency. The control member comprises an electromagnetic coil energized by a control signal having electric current produced by a control signal circuit which is proportional to a square of the nutation frequency. The block element may comprise either a permanent magnet or an electromagnet when a pendulum weight of the pendulum is of an electrical conductor. The electromagnet may intermittently be energized by a power source circuit. Alternatively, the block element may be of an electrical conductor when the pendulum weight is of a permanent magnet.
REFERENCES:
patent: 2996267 (1961-08-01), Warren
patent: 3637169 (1972-01-01), Tossman et al.
patent: 3806062 (1974-04-01), Hofmann et al.
patent: 3830447 (1974-08-01), Phillips
patent: 4168048 (1979-09-01), Renner
Ayada Haruki
Fukui Tatsuyuki
Ikebe Ken'ichi
Okada Munenori
Takezawa Susumu
Blix Trygve M.
Corl Rodney
NEC Corporation
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