| 摘要 |
An ascent vent cover (24) for covering and sealing vent holes (22) in a payload launch vehicle (21) is disclosed. The ascent vent cover (24) includes a magnetic sheet (32) for covering the vent hole (22) and attaching the ascent vent cover to the payload launch vehicle, a plurality of magnets (34a, 34b, 34c, . . . ) for augmenting the holding strength of the magnetic sheet, and a stiffening panel (38) for facilitating the peeling of the ascent vent cover away from the payload launch vehicle (21). The magnets (34a, 34b, 34c, . . . ) are secured to the magnetic sheet (32) so that some are positioned in a circular pattern so as to surround the underlying vent hole (22) and others are positioned along a leading edge of the magnetic sheet (32). The stiffening panel (38) includes a cover portion (39) and a tab portion (40) for securing to the magnetic sheet (32). The magnets (34a, 34b, 34c, . . . ) are embedded in the cover and tab portions. The tab portion (40) of the stiffening panel (38) is secured to a leading edge of the magnetic sheet (32) and functions primarily to facilitate the deployment of the ascent vent cover when sufficient dynamic pressure or air velocity is applied to the leading surface of the tab portion during the launch of the payload launch vehicle. Preferably, an RF shield (36) is located between the magnetic sheet (32) and the stiffening panel (38).
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