The Research Of The SINS Vibration Control Technology

With the construction of modern national defense, it put forword higher and higherrequirements for the precision strike and pinpoint navigation. Because of its simplestructure, small volume, light weight and high precision, the SINS(Strapdown InertialNavigation System) was widely used in missile guidance, land vehicle navigation and otherfields. However, with the complication of the practical application encironment, thenavigation precision of the SINS was greatly influenced by the vibration of the environment.So it was very important to control the vibration of the SINS.In this article, a large number of revelvant technical literature at home and abord waslooked up and analysised, then the passive vibration isolation technology and activevibration control technology with high attention currently were studied. On the basis ofunderstandering the vibration characteristics of the SINS, the theoretical analysis, finiteelement simulation and experimental research were taken by the two technologies. Finallythe different technologies reached the corresponding effect to control the vibration. Theactive vibration control technology was better and had extensive applicability and structuralintegration.Fistly, analyzed the vibration charactertics of the SINS in the practical applicationenvironment, and then established the6-DOF equal motion model of the passive vibrationisolation system of the SINS based on the simplified SDOF elastic support system of therigid body of the passive vibration isolation system. Then the dynamics analysis of themodel was carried out and the dynamics differential equation was established. The model ofthe active vibration isolation system was established and the dynamic analysis of the modelwas carried out based on the analysis of the passive vibration isolation system. The finiteelement model of the active vibration control system with pasted piezoelectric actuators of the SINS was established based on the constitutive equation of the piezoelectric smartstructures and the Hamilton principle, and the degree reduction of the finite element modelwas taken by the method of modal truncation. The optimized configuration of thepiezoelectric sensors and actuators was analyzed by D optimization criterion in the activevibration control system.Secondly, the structure dynamics simulation of the SINS installation components wascarried out with ANSYS, and the first four order vibration modes were obtained. Thesimulation of the passive vibration isolation system and the acitve vibration isolation systemand the active vibration control system with pasted piezoelectric actuators of the SINS wascarried out under the sinusoidal loads and transient loads according to the practicalapplication. The different kinds of control technologies all reached the control effectaccording to the analysis, and the simulation of the optimized configuration to thepiezoelectric sensors and actuators in the acitve vibration isolation system and the activevibration control system with pasted piezoelectric actuators was carried out.Finally, the experimental verification was taken. The oscillation search of the SINSinstallation components was carried and the resonant frequency was found which fell inwith the simulation results. The passive vibration isolation system of the SINS installationcomponents was built, and swept-sine and random vibration experiment was taken, and theexperimental result fell in with the simulation result. The active vibration control system ofthe SINS was built. According to the experimental verification, the experimental result andthe simulation result were identical. So the simulation result had higher accuracy andreference value.