Research On Modeling And Simulation Of Linear Vibration And Overload Test

PIGA(Pendulous Integrating Gyro Accelermeter) is widely used in the navigation platform of strategic weapons for their high accuracy, but PIGA is sensitive to angular velocity, so the overload testing of it requires low speed centrifuge or linear vibration table. As there are few centrifuges and linear vibration tables satisfying the performance, this dissertation studied centrifuge, linear vibration table and PIGA individually based on ADAMS and explored the parameters identification method of PIGA which was in centrifugal or linear vibratory simulation environment. This study has laid the foundation for future researching gyro- accelerometer testing techniques and methods. The main contents of this dissertation are shown as followes:The PIGA’s static error model and centrifuge test error model were derived respectively based on kinetics. The inner ring angular ? how to impact the corresponding error model was discussed. All of these have made theory preparations for linear acceleration test, centrifugal overload test and linear vibration test.The virtual prototype of composite platform body and the PIGA were built individually by using dynamic simulation software ADAMS, then validated the overload environment, linear vibration environment and both included environment provided by composite platform body virtual prototype. The four position simulation test of the PIGA were finished in the PIGA virtual prototype, then different apparent acceleration simulation test were followed and calibrated the coefficients of PIGA’s static error model with least squares method to provide references for the follow-up simulation test and parameters calibration.Finally, the PIGA’s centrifuge test and linear vibration test were completed successfully and demarcated the model coefficients according to the corresponding test individually. During the centrifuge overload simulation, the PIGA’s error model coefficients were calibrated with least square method. Linear vibration simulation test was divided into horizontal and vertical linear vibration simulation. The identification and analysis of model coefficients were calibrated with amplitude mean value and integer periodic integral method respectively, and the identification problem of installation error was researched during horizontal linear vibration simulation test. During the vertical linear vibration simulation test, the model coefficients were calibrated with integer periodic integral method, which’s results were compared with the horizontal linear vibration test’s.This paper the first achieved PIGA’s centrifuge test and linear vibration test based on ADAMS software which provided meaningful information for further study in future.