Rotorcraft vibration suppression system in a four corner pylon mount configuration

A vibration suppression system for an aircraft, comprising:

• a pylon mount structural assembly configured to control pitch and roll dynamics of a vibrating body within the aircraft, the pylon mount structural assembly having a pylon structure configured to support the vibrating body at a point of coupling;
• and
• a vibration isolator located at each end of the pylon structure to control the transmission of vibrations through the aircraft, the vibration isolator being spaced away from the vibrating body, the vibration isolator having;
• a piston spindle resiliently coupled to an upper housing with an upper elastomer member, the piston spindle being resiliently coupled to a lower housing with a lower elastomer member;
• and
• a spherical bearing assembly having;
• an attachment member;
• and
• a spherical elastomeric member having;
• an elastomeric material bonded between a non-resilient concave member and a non-resilient convex member;
• wherein the spherical bearing assembly is located at least partially around the lower housing for coupling to the pylon structure;
• wherein the spherical bearing assembly is configured to compensate for misalignment in loading between the pylon mount structural assembly and the
• vibrating body;
• and
• wherein the pylon structure is conformed to locate the point of coupling inboard of the vibration isolator.

A vibration suppression system for an aircraft, comprising:

• a pylon mount structural assembly configured to control pitch and roll dynamics of a vibrating body within the aircraft, the pylon mount structural assembly having a pylon structure configured to support the vibrating body at a point of coupling;
• and
• a vibration isolator located at each end of the pylon structure to control the transmission of vibrations through the aircraft, the vibration isolator being spaced away from the vibrating body, the vibration isolator having;
• a piston spindle resiliently coupled to an upper housing with an upper elastomer member, the piston spindle being resiliently coupled to a lower housing with a lower elastomer member;
• and
• a spherical bearing assembly having;
• an attachment member;
• and
• a spherical elastomeric member having;
• an elastomeric material bonded between a non-resilient concave member and a non-resilient convex member;
• wherein the spherical bearing assembly is located to have a waterline location equal to a waterline location of a driveshaft axis;
• wherein the spherical bearing assembly is located at least partially around the lower housing for coupling to the pylon structure;
• wherein the spherical bearing assembly is configured to compensate for misalignment in loading between the pylon mount structural assembly and the
• vibrating body;
• and
• wherein the pylon structure is conformed to locate the point of coupling inboard of the vibration isolator.