发明名称 |
Spacecraft with gradual acceleration of solar panels |
摘要 |
A spacecraft (8) includes a movable appendage such as solar panels (12) operated by a stepping motor (28) driven by pulses (311). In order to reduce vibration andor attitude error, the drive pulses are generated by a clock down-counter (312) with variable count ratio. Predetermined desired clock ratios are stored in selectable memories (314a-d), and the selected ratio (R) is coupled to a comparator (330) together with the current ratio (C). An up-down counter (340) establishes the current count-down ratio by counting toward the desired ratio under the control of the comparator; thus, a step change of solar panel speed never occurs. When a direction change is commanded, a flag signal generator (350) disables the selectable memories, and enables a further store (360), which generates a count ratio representing a very slow solar panel rotational rate, so that the rotational rate always slows to a low value before direction is changed. The principles of the invention are applicable to any movable appendage.
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申请公布号 |
US5520359(A) |
申请公布日期 |
1996.05.28 |
申请号 |
US19940236301 |
申请日期 |
1994.05.02 |
申请人 |
MARTIN MARIETTA CORPORATION |
发明人 |
MERHAV, TAMIR R.;FESTA, MICHAEL T.;STETSON, JR., JOHN B. |
分类号 |
B64G1/44;(IPC1-7):B64G1/44 |
主分类号 |
B64G1/44 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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