Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Dual piston drag damper for rotary-wing aircraft rotor










Image Number 5 for United States Patent #6676074.

A drag damper for use on a rotary wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers are filled with fluid and are connected by a restriction port (35) and by a channel (32) of larger cross-section than the restriction port. A secondary piston slidable and pressure-tight piston is fitted in the channel and loaded by an elastic bias (34). The equivalent mass of this secondary piston (33) and of the fluid which it displaces, and the stiffness of the elastic bias (34) are such that the secondary piston is resonant in the channel (32) at the rotation frequency of the rotor, to filter the dynamic component at this frequency of stresses applied to the damper (20). Furthermore at the natural drag frequency of the corresponding blade, the elastic bias substantially blocks the secondary piston (33) in its channel (32), and the flow of fluid between the chambers (29, 30) of the damper (20) takes place mainly via the restriction port (35) calibrated to provide substantial damping at this frequency.








 
 
  Recently Added Patents
Method and system for physical verification using network segment current
Arcuate motion control in electrostatic actuators
Porous objects having immobilized encapsulated biomolecules
Systems and methods for sorting particles
Methods for processing 2Nx2N block with N being positive integer greater than four under intra-prediction mode and related processing circuits thereof
Detecting the type of NAT firewall using messages
Method, apparatus, computer program, and computer readable storage media for controlling the insertion of tab sheets into a print job
  Randomly Featured Patents
Pallet assembly for assembling a fiber optic module that includes a housing
N.sup.4-acylcytosine nucleosides for treatment of viral infections
Use of certain phenolic resins for reinforcing rubber vulcanizates
Field effect transistor and method of manufacturing the same
Vortex phase shift mask for optical lithography
Tongue and tooth cleaning device
Switch for power take-off controls
Power device package having enhanced heat dissipation
Apparatus for treating and purifying waste water
System and method for protecting a computer and a network from hostile downloadables