Performance Analysis And Parameter Optimization Design Of Eight-bar Parallel Buffer Platform

During the mission of the ship,the inertial navigation systems are not only subjected to vibration loads generated by the periodic motion of mechanical equipment such as propellers or diesel engines,but also shock loads generated by the slap of waves or the explosion of underwater weapons such as enemy mines and torpedoes.In order to ensure the accuracy of navigation,it is necessary to install a vibration isolation buffer device,taking the eight-bar parallel buffer platform as the research object,the following aspects are mainly studied:(1)Solved the pose solution based on space coordinate transformation,aiming at the difficult problem of multivariate nonlinear equations in the forward pose solution,established the least square optimization model and designed an improved PSO-Newton algorithm to solve.The results show that the improved algorithm can quickly and accurately calculate the platform pose,and the dependence on the initial value is not high,this method is effective and feasible.(2)Analyzed the dynamic performance of the eight-bar parallel buffer platform,established the eight-bar parallel buffer’s dynamic model based on the influence coefficient method,analyzed the influence of platform structure parameters on the natural frequency of the system,adopt Newmark-β method solve the dynamic response of the platform under shock load,analyzed the shock of the stiffness and damping of the bumper bar on the shock resistance.The analysis results provide a theoretical basis for the parameter optimization design of the eight-bar parallel buffer platform.(3)In order to verify the correctness of the kinetic theory model and solution method,established a parametric simulation model of the eight-bar parallel buffer platform in multi-body dynamics simulation software,carried out modal analysis and dynamic simulation,the shock test is designed,and the vertical shock test at different heights is carried out on the drop test bench.The results show that the established simulation model can highly restore the true response of the platform after being shocked,and can provide the required simulation data for parameter optimization design.(4)In order to improve the vibration isolation and shock resistance of the eight-bar parallel buffer platform,based on the results of dynamic analysis,established an optimization model based on sixth-order natural frequency average value and standard deviation,acceleration amplitude and root mean square value.The results show that under the premise of ensuring the platform has good shock resistance,the vibration isolation bandwidth of the system is enlarged,and the probability of resonance is reduced,so that the platform can adapt to the complex vibration and shock environment.