| 摘要 |
Assembly that comprises cardan joint converts the linear oscillations of unstable base Into the angular oscillations of the camera base. To avoid resonance vibrations in the cardan joint, servo drives are provided that receive feedback from the active forces. Servo drives allow the unstable base to swing and vibrate without transmitting vibrations to the stabilized part. A sensor for measuring oscillations is mounted on the stabilized part. Signal from oscillation sensor controls the servo drives for compensation of active force that would make swinging of stabilized part. Thus the servomechanism performs the function of active dampers and prevents harmonic oscillations in the assembly. Both horizontal and vertical oscillations can be stabilized. Angular oscillations of the camera are stabilized by additional rotational assembly. While the design is relatively simple, it ensures high damping ratio in a wide range of vibration frequencies and amplitudes. Besides camera applications, it can be also used to stabilize other equipment on mobile platforms. |
