Study On Principle Of Irrotational Displacement Isolator

Aviation reconnaissance has strong real-timing, high accuracy, wide reconnaissance range, good maneuverability and pertinence, while ground reconnaissance is dangerous and limited by earth curvature, topography and obstacles, making up for the lack of real timing and details of satellite reconnaissance. So aviation reconnaissance is still the basic and effective means to collect tactic information.Aviation reconnaissance is realized by airborne opto-electric reconnaissance platform. It is a complex Opto-Mechatronics system for the aircraft to observe the circumstances surrounding it, to obtain image information, to indicate and aim at targets. Inside the platform are mainly kinds of opto-electronic sensors. Such as visible and infrared cameras, laser rangefinder, target laser illuminators. These airborne integrated sensors are mounted to the platform which can rotate free to realize various functions. The opto-electric devices are called the opto-electronic payloads. Opto-electronic payload is the necessary and sufficient condition to realize optical imaging, collect target information. Because of the special mechanical environment of aviation reconnaissance, the functioning of opto-electronic payloads relies on the stabilization system.While the airborne opto-electronic reconnaissance devices are working, there are various inner and outer vibration sources. They are the vibration caused by focusing, zooming and dimming mechanisms, the vibration caused by the unset of the center of gravity of camera and vacillating of the support frame, the vibration caused by the working engines of the aircraft and rapid change of speed, direction, height and attitude. In the complex vibration environment, there will be a relative movement between the target and the optic axis, leading to image motion and image blur. So vibration isolation techniques must be taken for airborne opto-electronic reconnaissance devices. Irrotational displacement isolator is the indispensable key link to ensure the image quality of airborne photoelectric reconnaissance platform.Known from analysis, angular vibration plays a much bigger part in the image motion than line vibration. The angular vibration should be suppressed and line vibration should be reduced while designing. On the base of comparing various vibration control techniques, passive vibration isolation is chosen because of its simplicity, reliability and economical efficiency. By use of non-angular theory, the three dimensional model of airborne vibration isolation platform is built, and so is the ADAMS virtual prototype of it.By use of the ADAMS/vibration analysis module, the established virtual prototype is analyzed and tested. Random vibration test and swept sine test are performed as the random signal and sine signal being the vibration driving source signal. Displacement response, speed response and acceleration response separately in the six direction of freedom are obtained. By use of the auto optimizing function of ADAMS, the optimum value of damping and stiffness are gotten. The results indicate that, the vibration isolation platform suppressed the angular vibration and reduced the line vibration.The error of the damping mechanism of the vibration isolation platform affects directly on the damping effect. By analyzing the main factors that affecting the error, the error analysis methods and the error reductionistic strategy have been discussed. I established the error model of the vibration isolation mechanism, and performed simulation analysis by MATLAB on the model. The prototype of the mechanism has also been tested. By contrastively analyzing the test results, the main factors affecting the error have been found out, and the methods for improving precision of the mechanism have been brought forward.