: According to the Nyquist stability criterion, eigenvalue theory and LQR control theory, the calculating formulae for time-delay of the structure-modal active control system with displacement-velocity feedback have been derived.

The application of ISP technology and ISP deviceson position feedback module in service system;

In this paper, a general controlling system for step-motor based on P89C662, was introduced, which can control step-motor with different phases or power, handle step-motor’s position feedback and communicate with several modes.

According to the operating characteristics of ultrasonic motors,several PID position feedback control methods have been implemented and compared.

The design of speed feedback in a digital AC servo control system;

Controlling spatiotemporal chaos by speed feedback method

In this paper, some methods for realiaing speed feedback are analnd .

The substance of the Skyhook control is discussed and a new semi-active vibration control strategy based on acceleration feedback and velocity feedback is established.

The experiment shows that, no matter how the supporter is excited, harmonically or randomly, its vibration may effectively be suppressed by using piezoceramic material as sensors and actuators to achieve velocity feedback controlling.

By means of velocity feedback control agolrithm the active vibration control of laminates is fulfilled.