Analysis Of Use Performance For Solid Rocket Moter Flexibility Nozzle

Thrust vector control(Thrust Vector Control-TVC) system is a mechanical power unit solid rocket motor, the final part of the aircraft is to achieve control. The research object-full axis swing variable cross-section flexible nozzle, is Ⅰ thrust vector control system with lightweight, small torque and high-precision characteristics of a solid rocket motor.The service life of TVC system depends on the life of the flexible joint, and nozzle total life cycle for 15 years. The nozzle was required to undergo changes in the course of temperature(-40℃ ~ 60℃), bearing pressure change course(0 MPa ~ 0.3 MPa) and swing the course(frequency 0.1Hz, at least 5000) in the life cycle. Under equal stress conditions,the variable section flexible joints by different layer thicknesses of the rubber elastomer rings and the metallic reinforcement rings and so on alternately adhesive composition. The elastomer ring of rubber material of joints is affected by environmental temperature and storage time.In long-time storage, after experiencing a variety of load history, the mechanical properties of materials change, easily aging, causing the system motion accuracy is difficult to control, the system increases power torque,swings slow down or even shut down, also takes long duration, low efficiency. In its life cycle, the establishment of joint accelerate aging model and different temperatures and long storage time, after the system has experienced variety of load history, the reliability of aging joints and joints inside the three-dimensional stress, deformation and make Moment, pivot point drift and other issues, is the unresolved key technology and the key to solving the design and functioning of the system.According to above problems, this paper combined with the accelerated aging test of flexible joints elastomer rings of rubber material, established accelerating aging prediction model based on the shear modulus of material of elastic piece; get the material properties of the whole life cycle of each storage temperature. With ANSYS and ADAMS software platform, basis on the completion of equal stress conditions and variable cross-section of the structural design of flexible joints, combined with the breakdown of the research results, established joint system of nonlinear finite element and multi-body dynamics rigid coupling calculation model; Using finite element methods and collaborative dynamics calculations, realized in the whole life cycle of the various onboard systems process, analysis of key performance computing systems. Based on the time-temperature accelerated aging prediction model of joint elastomer rings resulting the aging critical performance of materials, With the stress and strain of finite element calculations andsystem dynamics load calculation results of joint elastic parts. Ncode-desighlife as a platform to calculate the fatigue life analysis of aging joints and under critical condition the Stress and strain distribution of joint; based on experiments, get the best system load history and the best life cycle.