| 摘要 |
<p>An exciter for applying a dynamic torsional force to a rotating structure, such as to the shaft of a turbine generator, the axle of a vehicle, or the like, during mechanical testing to determine the mechanical response characteristics, natural modes of vibration, fatigue life, etc., of the structure.</p><p>The exciter (20) preferably includes a rotary hydraulic actuator (21) having a housing (22) secured to the structure (10,11,12) to be tested and a driveshaft which is rotatable relative to the housing (22) as well as an inertial mass (30) mounted on the driveshaft. The exciter (20) also includes a hydraulic power supply (58) for the actuator (21) and an electrohydraulic means comprising a torque setpoint circuit (59) for producing a torque command signal to set the desired amplitude and frequency of oscillation of the inertial mass (30), a position setpoint circuit (72) for producing a position command signal to set the mid-point of the arc through which the inertial mass (30) oscillates, means for producing a torque feedback signal dependent on the actual dynamic torsional force produced by the oscillating inertial mass (30), means for producing a position feedback signal dependent on the average angular position of the inertial mass (30) relative to the structure (10,11;12) as the inertial mass (30) oscillates and a controller (68) responsive to the command and feedback signals for energizing a servovalve (55) that controls the supply of pressurized fluid to the actuator (21). The actuator (21) oscillates the inertial mass (30) relative to the structure (10,11,12) to be tested in order to produce a controlled dynamic torsional force on the rotating structure (10,11,12).</p> |
