| 摘要 |
A tuned vibration absorber (40) includes a mounting plate (42) having at least two (46, 56), and alternatively four, mounting holes (46, 50) in spaced relationship from a longitudinal center axis of the plate (42). An elastomeric spring (60) is bonded to the mounting plate (42). A main tuning mass (70) is bonded to the elastomeric spring (60) opposite the mounting plate (42), and fine tuning masses (72) are riveted directly onto the main tuning mass (70). The elastomeric spring (60) and main mass (70) both have a rectangular profile to maintain a low profile height from the mounting plate (42). A cover (50) is formed of a single sheet of metal bent to form a rectangular box with one open side. The cover (50) includes mounting flanges (54) with holes (56) that align with the mounting holes (46) on the mounting plate (42). For mounting the vibration absorber on a stiffening ring (10) of an aircraft frame, a spacing plate (90) is positionable between a portion of the mounting plate (42) and the stiffening rib (10) of an aircraft frame, and adjacent to an overlapping secondary stiffening (14, 16) ring to provide a flat mounting surface.
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