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    • 4. 发明授权
    • Damping mechanism for the rotor hub of a helicopter for ground resonance
and waddle and its combination with the rotor
    • 用于地面共振和桨叶的直升机转子轮毂的阻尼机构及其与转子的组合
    • US4073600A
    • 1978-02-14
    • US695737
    • 1976-06-14
    • Glidden S. Doman
    • Glidden S. Doman
    • B64C27/00B64C27/41B64C27/52
    • B64C27/41B64C27/001B64C2027/002
    • A damping mechanism is disclosed for damping the oscillations of the rotor hub which are coupled with periodic motions of the fuselage when on the ground, known as ground resonance, and a waddle when in the air. The rotor includes a freely tiltable rotor head mounted on a non-rotatable universal joint having an outer gimbal ring and an inner ring carried by a pylon. The damping mechanism connected between a gimbal ring and the pylon combines the action of a fluid dashpot in tandem with spring means the output of which is connected into the linkage between the pilot stick and the swash plate. The tandem combination of dash pot and spring means delays the signal to the swash plate by about 90.degree. to insert a corrective movement into the swash plate with feathering of the blades to tilt the rotor thrust vector which damps the oscillations of the rotor hub. The invention includes the damping mechanism per se and its combination with the rotor and with the swash plate.
    • 公开了一种用于阻尼转子毂的振荡的阻尼机构,其在地面上与机身的周期性运动相耦合,称为地面共振,以及在空气中时的瓦鞍。 该转子包括一个可自由倾斜的转子头,该转子头安装在一个非旋转的万向接头上,该万向节具有外部万向节环和一个由塔架承载的内圈。 连接在万向环和吊架之间的阻尼机构将流体缓冲器的作用与弹簧装置结合,弹簧装置的输出连接到导向杆和斜盘之间的连杆中。 仪表盘和弹簧的串联组合意味着将信号延迟到斜盘约90°,以将叶片的羽化将旋转斜盘插入旋转斜盘,使转子推力矢量倾斜,从而减小转子毂的振荡。 本发明包括阻尼机构本身及其与转子和斜盘的组合。
    • 6. 发明授权
    • Oscillation damper for the hub of a rotorcraft rotor and its combination
with a rotorcraft
    • 旋翼飞轮转子的轮毂振动阻尼器及其与旋翼航空器的组合
    • US4004757A
    • 1977-01-25
    • US623008
    • 1975-10-16
    • Glidden S. Doman
    • Glidden S. Doman
    • B64C27/58B64C11/44
    • B64C27/58Y10S416/50
    • A rotorcraft is subject to a rocking motion when on the ground, which is called ground resonance, and in the air which gives the fuselage a waddle type of motion about its center of gravity. both are a form of aeromechanical instability. This fuselage motion is coupled with and accompanied by bending oscillations of the blades with respect to the hub of the rotor of the rotorcraft. An oscillation damper is described which damps the oscillations of the aircraft and thereby eliminates or substantially reduces the rocking and waddle motion of the fuselage. The damper includes a seismic device having a mass-spring combination tuned to the frequency of the rocking motion which will typically be one half or approximately one half of the rotor revolutions per minute at cruising speed and is positioned laterally of and spaced from the center of gravity of the fuselage. The movement of the weight in response to fuselage motion operates a control and the control operates a motor which expands and contracts in response thereto. The motor is connected with the swash plate to change the pitch of the blades of the rotor in proper phase relation with the hub oscillation and thereby provide a vector force which damps the oscillations. The control particularly illustrated is a pair of fluid valves and the motor is a fluid motor.
    • 旋翼航空器在地面上受到摇摆运动,称为地面共振,并且在空气中使机身围绕其重心产生鞍形运动。 两者都是一种航空力学不稳定的形式。 该机身运动与叶片相对于旋翼飞机的转子的轮毂的弯曲振荡相耦合并伴随着弯曲振荡。 描述了一种减振飞行器振荡的振动阻尼器,从而消除或基本上减少了机身的摇摆和瓦楞运动。 阻尼器包括具有调整到摇摆运动频率的质量 - 弹簧组合的地震装置,其通常将以每分钟的巡航速度的转子转数的一半或大约一半定位并且位于 机身重力。 响应于机身运动的重量的运动进行控制,并且控制操作电动机,其响应于此而增大和收缩。 电动机与斜盘连接,以改变转子叶片的桨距与轮毂振荡的正确相位关系,从而提供阻止振荡的矢量力。 具体示出的控制是一对流体阀,电机是流体马达。