摘要:
Vibration control systems, devices, and methods are provided for a rotary wing aircraft having a rotor including a plurality of blades (20) each attached to a hub (10) at its root end and capable of pitching with respect to the hub (10). The systems, devices, and methods include a blade pitch adjuster (100) that is passively adjustable in response to aerodynamic loading on the plurality of blades (20) to adjust a pitch of one of the plurality of blades (20) with respect to the hub (10) based on a frequency of the aerodynamic loading. The blade pitch adjusters (100) can be configured to exhibit relatively high stiffness at the rotor rotating frequency and tailored dynamics at frequencies higher than the rotor rotating frequency such that hub loads at one or more higher harmonics are reduced.
摘要:
The invention provides a system for creating a prescribed vibration profile on a mechanical device comprising a sensor (30) for measuring an operating condition of the mechanical device, a circular force generator CFG (20) for creating a controllable rotating force vector comprising a controllable force magnitude, a controllable force phase and a controllable force frequency, a controller (22) in electronic communication with said sensor and said circular force generator, the controller operably controlling the controllable rotating force vector, wherein the difference between the measured operating condition and a desired operating condition is minimized.
摘要:
Hub-mounted active vibration control (HAVC) devices, systems, and related methods are provided. An HAVC device includes a housing having a tolerance ring attached to a rotary hub. The tolerance ring can accommodate dissimilar coefficients of thermal expansion between dissimilar metals. The HAVC device can also include a plurality of coaxial ring motors configured to rotate a plurality of imbalance masses for controlling vibration. An HAVC system can further include a de-icing distributor for communicating instructions to one or more heating sources provided at one or more rotary blades of a vehicle or aircraft. A method of controlling vibratory loads occurring at a moving platform can include providing a moving platform, mounting a vibration control device to a portion of the moving platform, and rotating at least one pair of imbalance masses such that the combined forces of the masses substantially cancel unwanted vibration of the platform.
摘要:
The controllable suspension system for controlling the relative motion between a first body and a second body, said controllable suspension system comprised of a strut, said strut including a magnetorheological fluid damper, wherein contact between a piston head 44 and a damper tubular housing inner wall 38 is inhibited.
摘要:
Helicopter reduced vibration axial support struts and aircraft suspension system are disclosed with at least one vibration controlling fluid containing strut. The powered struts include an outer rigid housing (28) containing an inner rigid member (32) and first (62) and second (64) variable volume fluid chambers. Fluid pressure differentials are created between the first and second variable volume fluid chambers to control motion between the strut ends. The powered fluid containing struts, support isolators, suspension systems, and methods of operation provide reduced helicopter aircraft vibrations.
摘要:
Helicopter reduced vibration axial support struts and aircraft suspension system are disclosed with at least one vibration controlling fluid containing strut. The powered struts include an outer rigid housing (28) containing an inner rigid member (32) and first (62) and second (64) variable volume fluid chambers. Fluid pressure differentials are created between the first and second variable volume fluid chambers to control motion between the strut ends. The powered fluid containing struts, support isolators, suspension systems, and methods of operation provide reduced helicopter aircraft vibrations.