Active Suppression Of Vibrations In Rotating Machinery
NASA Technical Memorandum discusses problems arising in application of advanced methods of active control to suppress vibrations in large turbines and other rotating machinery.
Ulbrich, Heinz↗
Engineering topics
Ulbrich, Heinz
Publications and source records attributed to Ulbrich, Heinz.
Hydraulic Actuator System for Rotor Control
In the last ten years, several different types of actuators were developed and fabricated for active control of rotors. A special hydraulic actuator system capable of generating high forces to rotating shafts via conventional bearings is addressed. The actively controlled hydraulic force actuator features an electrohydraulic servo valve which can produce amplitudes and forces at high frequencies necessary for influencing rotor vibrations. The mathematical description will be given in detail. The experimental results verify the theoretical model. Simulations already indicate the usefulness of this compact device for application to a real rotor system.
Ulbrich, Heinz↗
Elements of active vibration control for rotating machinery
The success or failure of active vibration control is determined by the availability of suitable actuators, modeling of the entire system including all active elements, positioning of the actuators and sensors, and implementation of problem-adapted control concepts. All of these topics are outlined and their special problems are discussed in detail. Special attention is given to efficient modeling of systems, especially for considering the active elements. Finally, design methods for and the application of active vibration control on rotating machinery are demonstrated by several real applications.
Ulbrich, Heinz↗