Research On Airborne Radar Vibration Isolation Platform Based On Parallel Mechanism

With the continuous development of aerospace technology, vibration resistance of airborne equipment is changing from adapting to dynamic environment to using isolation technology. Airborne equipment is no longer to ensure the reliability of structures through strengthening stiffness and strength, but leading anti-vibration mechanism to adapt to the harsh aviation environment. Therefore, whether in the field of rocket isolation or in the field of airborne equipment isolation, isolation mechanism will be the development direction in the future.The design of Multi-DOF vibration isolation parallel mechanism is a core part of the isolation system establishment. Combined with the designing methods of parallel mechanism and mechanical vibration theory, parallel mechanism isolation platform based on airborne radar are focused on theoretical research. A parallel mechanism isolation platform with redundancy protection is proposed; Considered working conditions, eight-isolator parallel mechanism isolation platform was designed by using the parallel mechanism theory; The reasonable of mechanism designing is verified based on screw theory and kinematics simulation. The results show that the design of vibration isolation mechanism is reasonable, meeting the requirements of airborne radar isolation. Finally, wire rope isolators and hinge are designed. Using the finite element method, the strength analysis of a finite element model of the hinge is checked. Results show that the hinge material selection and design are reasonable.Parameters matching platform is an important factor of affecting the performance of vibration isolation platform. Dynamic model of eight-isolator parallel mechanism isolation platform is established; Using Firefly algorithm, parameter matching is realized, then structural parameters are obtained when isolation platform is in the optimal transfer rate; The research of vibration isolation performance, such as swept sine、 impact and function test values, is completed on ADAMS and the correctness of the parameters is verified. By co-simulation through ADAMS and ANSYS, rigid-flexible coupling model is set up, receiving the result of deformation on radar antenna; The results show that vibration isolation platform have good high-low frequency vibration isolation performance, which can be adapted to high-low temperature, multi-dimensional vibration of aerospace condition.