METHOD AND APPARATUS FOR NON-MODEL BASED DECENTRALIZED ADAPTIVE FEEDFORWARD ACTIVE VIBRATION CONTROL

    公开(公告)号:CA2248302A1

    公开(公告)日:1997-10-02

    申请号:CA2248302

    申请日:1997-01-14

    Applicant: LORD CORP

    Abstract: A method and system/apparatus implementing a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA) for active vibration control of an actively-driven element, such as an Active Vibration Absorber (AVA) (24). The AVA (24)preferably includes an inertial tuning mass (42) and a voice coil assembly (46) and is contained in an active vibration control system (20) wherein the method and system/apparatus reduce vibration of a vibrating member (22) at an attachment point (26) by receiving an error signal from an error sensor (28) such as an accelerometer and a reference signal from a tachometer (32) or accelerometer (34), where the reference signal is correlated to, or indicative of the frequency content of, a primary vibration source (36) and calculating an updated output signal via an electronic controller (39) using the non-model based DFAA to dynamically drive the actively-driven element, such as AVA (24). The method and system/apparatus using DFAA is effective for reduction of both tonal and broadband vibration. The method approaches the performance of Filtered-x LMS control, yet is decentralized and does not require information regarding the plant.

    MAGNETO-RHEOLOGICAL FLUID DAMPER HAVING ENHANCED ON-STATE YIELD STRENGTH

    公开(公告)号:CA2726629A1

    公开(公告)日:2009-12-10

    申请号:CA2726629

    申请日:2009-06-02

    Applicant: LORD CORP

    Abstract: A magneto-rheological fluid valve includes a magnetic field generator having at least one electromagnetic coil (204) and at least one magnetic pole having a pole length Lm.The magneto-rheological fluid valve further includes at least one flow channel (118) adjacent to the electromagnetic coil. The at least one flow channel has a gap width g, wherein the ratio Lm/g is greater than or equal to 15.

    27.
    发明专利
    未知

    公开(公告)号:DE69013464T2

    公开(公告)日:1995-02-23

    申请号:DE69013464

    申请日:1990-11-02

    Applicant: LORD CORP

    Abstract: A transducer (26) is directly associated with a fluid-type damper (18) having a cover member (36) and a cylinder member (28) that undergo telescopic movement relative to each other in response to relative movement between vehicle components (12,14) interconnected by the damper (26). In the preferred embodiments, both a passive electrical coil (40) and a magnet (44) are mounted upon the cover member (36), in fixed relationship to each other. Relative axial telescoping movement between the cover member (36) and the cylinder member (28) of the damper (26) changes the flux field of the magnet (44) and induces in the coil (40) a voltage which is proportional to the relative velocity between the damper members (36,28) and thus between the vehicle components (12,14) interconnected by the damper (26). In an alternative embodiment, the magnet (44 min c) is mounted upon an end portion of the damper cylinder member (28c).

    HELICOPTER VIBRATION CONTROL SYSTEM AND ROTATING ASSEMBLY ROTARY FORCES GENERATORS FOR CANCELING VIBRATIONS

    公开(公告)号:CA2743447A1

    公开(公告)日:2010-06-17

    申请号:CA2743447

    申请日:2009-12-14

    Applicant: LORD CORP

    Abstract: A rotary blade rotating hub mounted rotating assembly vibration control system (20) including a first imbalance mass concentration rotor (28), a second imbalance mass concentration rotor (44), a third imbalance mass concentration rotor (38'), and a fourth imbalance mass concentration rotor (44'). The first imbalance mass concentration rotor has a first imbalance mass concentration rotor center axis of rotation (136) centered on the rotating assembly center rotation axis (28). The second imbalance mass concentration rotor has a second imbalance mass concentration rotor center axis of rotation (142) centered on the rotating assembly center rotation axis. The third imbalance mass concentration rotor has a third imbalance mass concentration rotor center axis of rotation (136') centered on the rotating assembly center rotation axis. The fourth imbalance mass concentration rotor has a fourth imbalance mass concentration rotor center axis of rotation (142') centered on the rotating assembly center rotation axis. The first and second imbalance mass concentration rotors are driven at a first rotation speed greater than the rotating assembly operational rotation frequency while controlling the rotational position of the first imbalance mass concentration and the second imbalance mass concentration to produce a first rotating net force vector to inhibit a first vibration frequency. The third and fourth imbalance mass concentration rotors are driven at a second rotation speed greater than the rotating assembly operational rotation frequency while controlling the rotational position of the third imbalance mass concentration and the fourth imbalance mass concentration to produce a second rotating net force vector to inhibit a second vibration frequency.

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