Abstract: A vibration isolation device comprising a housing with a housing wall that defines a housing chamber, a first spring pack, a second spring pack, and a surface effect damper located between the first and second spring packs. The first and second spring packs and damper being located in the housing chamber. The isolation device further comprises a fuse mechanism which causes the device to act as a hard mount before the fuse is actuated and as a soft mount after the fuse is actuated.

Abstract: A vibration isolation device comprising a housing with a housing wall that defines a housing chamber, a first spring pack, a second spring pack, and a surface effect damper located between the first and second spring packs. The first and second spring packs and damper being located in the housing chamber. The isolation device further comprises a fuse mechanism which causes the device to act as a hard mount before the fuse is actuated and as a soft mount after the fuse is actuated.

Abstract: A method is described for identifying the primary load path of a particular engine. An elastomeric mount may then be made laterally soft in a first (in the disclosed case, the tangential) direction and more rigid in the direction of the primary load path. Efforts can then be directed to dynamically softening the mount in the primary load path. Specific apparatus may include passive fluid devices, active fluid devices, passive non-fluid devices and active non-fluid devices. In the case of a fluid mount, another feature of the invention is to have an auxiliary fill port of the volume compensator in alignment with at least one and, preferably both, of the primary fill port for the mount and the inertia track to facilitate filling.

Abstract: An isolation system (20) including the combination of an elastomeric mount (25) for attachment between a structure (24) and a vibrating member (22) and further including at least one passive tuned vibration absorber (TVA) (32) attached in the proximity the elastomeric mount (25) but on the structure side thereof. The resonant frequency f.sub.r of the passive TVA (32) is tuned to a resonant frequency f.sub.r just below the predominant operating frequency f.sub.o of the vibrating member (22), such that the resonance of the tuned vibration absorber (32) makes the structure (24) appear dynamically stiffer. In particular the ratio of f.sub.r /f.sub.o is in the range of between about 0.90 and 0.90. In one embodiment, the passive TVA (32) attaches directly to the inner member (28) of the elastomeric mount (25) and clamps the TVA assembly (43) to the structure (24) and clamps the structure (24) to the elastomeric mount (25).

Abstract: A fluid mount (20) provides a flexible connection and fluid effects such as damping and/or fluid inertia for a supported member (22) attached to a supporting member (24) in a singular and unitary package. The fluid mount (20) includes a beam (34) and a laminated elastomer and shim construction bonded thereto, defining variable volume fluid chambers (44, 46, 48, 50) and interconnecting fluid passageways (52, 54). Fluid effects are provided in both a radial translational mode (loading at R) and a rotational mode (loading at T) to suppress vibrations of the supported member (22).

Abstract: A mounting bracket assembly particularly suited for installation in an aircraft having outboard turbine engines to isolate the aircraft cabin from engine noises. The bracket assembly incudes a base fastened below the wing pylon and a pair of arms extending in spaced parallel relation below the base. The forward ends of the arms are connected to the engine, and the aft ends are interconnected to a torque tube which is resiliently fastened to the mounting bracket base by an elastomeric bearing assembly. The elastomeric bearing assembly includes a series of laminations of elastic and inelastic layers which extend along diametrically opposite upper and lower sides of the torque tube to mount the arms in resilient cantilever fashion to the base. The elastomeric bearing assembly permits the arms to rock about a pivot axis through the torque tube while accommodating other motions of the arms, such as vertical translations and relative angular displacements imposed under certain engine operating conditions.