Modeling and virtual prototype simulation of active vibration isolation platform for optical devices on vehicle

Abstract

Within this work, A two-stage active vibration isolation system used for precision equipment on vehicle is designed based on its random vibration environments and high stability requirements. This paper deals with the dynamic model and virtual prototype simulation of this system. The current methods commonly used in vibration control are introduced firstly. Fuzzy PID theory and magneto rheological damper are the basic theoretics of modeling due to their preferable performances in wideband frequencies control, fast response and big load capacity. Then by using Lagrange equation, simplified dynamic equation of vibration isolation platform with six degrees of freedom is established, and a model of vibration isolator considering vertical and angular movements is proposed. Finally, the random exciting function generated by road spectral density function is used for random excitation, the virtual prototyping simulation tests are carried, also the impulse response is verified. The results show that the platform has a good performance on vibration isolation, stability and impulse preventing in broadband frequencies, and meets the vibration environment requirements in certain random disturbance conditions.