Abstract:
A vibration isolator for connecting a first body and a second body includes a housing having a first chamber (22) , a second chamber (26) , and a port (24) connecting the first chamber (22) to the second chamber (26) and permitting fluid (34) to flow between the first chamber (22) and the second chamber (26). The first and second chambers (22), (26) and the port (24) defining a fluid reservoir (27) . The isolator (10) includes a gas-to-fluid accumulator (30) in fluid communication with the fluid reservoir (27) through a first one-way valve (140) and a second one-way valve (142) . The first one-way valve (140) allows fluid (34) to pass only from the fluid reservoir (27) to the accumulator (30) and the second one-way valve (142) allows fluid (34) to pass only from the accumulator (30) to the fluid reservoir (27). At least one of the first and second one-way valves (140), (142) being preloaded to a predetermined force to permit fluid flow through the at least one-way valve (140), (142) only when fluid pressure exceeds the predetermined force.
Abstract:
A tunable vibration isolator with active tuning elements having a housing, fluid chamber, and at least one tuning port. A piston is resiliently disposed within the housing. A vibration isolation fluid is disposed within the fluid chambers and the tuning ports. The tunable vibration isolator may employ either a solid tuning mass approach or a liquid tuning mass approach. The active vibration elements are preferably solid-state actuators.
Abstract:
A vibration isolator comprising: a piston (1605) resiliently disposed within a housing (1603) with a first set of seals (1607); a mount plate (1609) configured for attachment to a vibrating body, the piston being connected to the mount plate; an upper fluid chamber (1611) and a lower fluid chamber (1613), each being defined by the housing, the piston, and the first set of seals; a tuning port (1620) for fluid communication between the upper fluid chamber and the lower fluid chamber; a tuning fluid disposed within the upper fluid chamber, the lower fluid chamber, and the tuning port; and a piezo piston (1619) resiliently disposed with the housing, the piezo piston being configured to be driven by at least two piezoceramic actuators (1623).
Abstract:
A vibration control system 200 for a rotorcraft 100 includes at least one of an integrated actuator 208 and an intermediate actuator 210 associated with a first source of vibration, a sensor configured to sense vibration from the first source of vibration, a dedicated actuator 212 configured for association with a fuselage 106, and a controller 204 configured to receive information from the sensor and configured to control the dedicated actuator and the at least one of the integrated actuator and the intermediate actuator.
Abstract:
A vibration isolator comprising: a piston (1605) resiliently disposed within a housing (1603) with a first set of seals (1607); a mount plate (1609) configured for attachment to a vibrating body, the piston being connected to the mount plate; an upper fluid chamber (1611) and a lower fluid chamber (1613), each being defined by the housing, the piston, and the first set of seals; a tuning port (1620) for fluid communication between the upper fluid chamber and the lower fluid chamber; a tuning fluid disposed within the upper fluid chamber, the lower fluid chamber, and the tuning port; and a piezo piston (1619) resiliently disposed with the housing, the piezo piston being configured to be driven by at least two piezoceramic actuators (1623).
Abstract:
A vibration isolator for connecting a first body and a second body includes a housing having a first chamber (22) , a second chamber (26) , and a port (24) connecting the first chamber (22) to the second chamber (26) and permitting fluid (34) to flow between the first chamber (22) and the second chamber (26). The first and second chambers (22), (26) and the port (24) defining a fluid reservoir (27) . The isolator (10) includes a gas-to-fluid accumulator (30) in fluid communication with the fluid reservoir (27) through a first one-way valve (140) and a second one-way valve (142) . The first one-way valve (140) allows fluid (34) to pass only from the fluid reservoir (27) to the accumulator (30) and the second one-way valve (142) allows fluid (34) to pass only from the accumulator (30) to the fluid reservoir (27). At least one of the first and second one-way valves (140), (142) being preloaded to a predetermined force to permit fluid flow through the at least one-way valve (140), (142) only when fluid pressure exceeds the predetermined force.