Application Research Of Vibration Damping Technology On The Airborne Photoelectric Stabilized Platform

Opto-electronic stabilization platform plays a very important role in modern armed helicopter strike,but carrier aircraft vibration caused by helicopter rotor high-speed rotation has a very bad effect on the stability of the photoelectric platform. The content of this paper is the application of vibration damping technology in airborne photoelectric stabilized platform,and in the analysis of advantages and disadvantages between the rubber damper and steel wire rope vibration damper, the wire rope damper in vibration hysteresis which has more superior performance, reasonable damping from design point of application of wire rope damper to reduce airborne vibration input to improve the photoelectric platform accuracy, precision strike capability and enhance the armed helicopter.The photoelectric detection circuit of weak signal proposed in the thesis is low-noise.Based on the analysis of the existing optical platform of common structural form and damping design,combined with the carrier aircraft vibration characteristics analysis of the effects of vibration on the photoelectric platform optical image axis, stresses the angular disturbance of LOS stabilization has more serious effect.This paper starts from the analysis of single degree of freedom vibration model of frequency response, and study on the relationship between the stiffness, damping, vibration transmissibility, natural frequency, Main points of design is to achieve a smaller damping vibration transmissibility and appropriate natural frequency, and the resonance amplitude is relatively small.At the same time,establish a nonlinear hysteretic damping model, study on the nonlinear hysteresis characteristics and vibration transmissibility of wire rope isolator. installation layout form of shock absorber and its characteristics, combined with the previous experience of the vibration isolator in a photoelectric platform within the reasonable installing layout form, establish the dynamic differential equation, study the force and moment on the shock absorber in the corresponding photoelectric platform structure and coupling vibration caused by the damper stiffness distribution. Finally, design and select of a particular parameter wire rope vibration isolator combined with theoretical analysis and actual situation of photoelectric platform, apply the finite element analysis software for the modal analysis and and harmonic response analysis of the vibration of a photoelectric platform design model, extraction the vibration modal parameters of each order and each modal response at the results, and design special tooling for shock absorber vibration table of doing sine sweep vibration test in vibration laboratory, vibration analysis of the amplification curves obtained after the shock absorber in combination of the resonance frequency, vibration amplification ratio and damping ratio, it is pointed out that the rational use of wire rope damper in the light electricity within the platform.This paper realize the reasonable use of wire rope isolator in optoelectronic platform, pointed out that the wire rope damper can effectively isolate the load machine vibration value input, improve the photoelectric platform for image quality and precision stability, of high precision photoelectric stabilized platform of precise guidance has a positive significance.