Design And Static-dynamic Research On The Rotating Isolation Device Of Rolling Aerocraft

With the coming of information era,precision guided weapons play an important role in the war.In order to improve the precision strike rate of numerous shells,it is necessary to guide the shells.The real-time and accurate acquisition of ammunition attitude information is also the key technology of shell guidance.At present,the rotating projectiles,such as active artillery shells and rockets,have not yet achieved full range,autonomous and high-precision attitude measurement.Because the existing missile attitude measurement system can not adapt to the special application environment of rotating projectiles,such as high speed,high overload and small volume.Therefore,it is important to improve the measurement accuracy and anti-high overload ability of the missile borne attitude measurement system.To solve the above problems,a new type of rotation isolation device is designed in this paper.The inertial sensor is placed in the "isolation area" so that it is not affected by the high speed of the missile body,so as to improve the navigation accuracy and attitude calculation accuracy of the inertial navigation system.The dynamic model of the rotating isolation device is established,two kinds of overload conditions are calculated,and the static and dynamic research on the anti-high overload ability of the device is carried out.Because of the harsh test conditions,the device can not be reused once tested,and the experiment cost is very high.Firstly,this paper designs and optimizes the device through software simulation.Then according to the finite element statics analysis,the anti-high overload ability of the device under static state is researched.According to the modal analysis,the first six natural frequencies of the key components of the device,their vibration modes and whether there will be the resonance appear is studied.Through the finite element transient dynamics simulation,the stress of the bearing under the whole launching dynamic process is studied,and the whole launching process of each component of the bearing is obtained.Because the device is used in special application environment,the mass and volume of the device should adopt high standard requirements and optimize it as much as possible.Through the topological optimization analysis,the device is designed for lightweight,and the strength and rigidity of the device after the topological optimization are verified.The final results show that the structural strength and rigidity of the rotating isolation device meet the requirements,the first six natural frequencies are high,and it will not resonate with other parts of the missile body.After optimization,the weight reduction effect of the device is obvious,and the strength and rigidity meet the requirements of use.