Abstract
The fuze launch process is subjected to backseat and spin overloads. To address this issue, a loading method of a 2D dynamic acceleration environment was developed in this study for testing fuze antioverload performance on ground. The techniques of flywheel energy storage, high-speed impact, and centrifugal rotation in the track are combined in a dynamic analysis and simulation. First, the flywheel is rotated at a constant speed by a variable-frequency motor to obtain high kinetic energy. Second, an impact hammer is instantaneously released on the specimen at a high speed, loading the backseat acceleration environment. Finally, the impact hammer is retracted, and the specimen is rotated in the track instead of spinning around its axis, thereby loading the centrifugal acceleration environment. The peak value and pulse width of the 2D overload acceleration can be adjusted by changing the speed of the flywheel and buffers in the abovementioned process. The experimental and simulation results observed that the peak value of backseat acceleration could reach 34,559 g, the pulse width was approximately 400 μs, and the peak value of the centrifugal acceleration was 1,020 g. The study results showed that the proposed approach fulfills the requirements of the 2D overload simulation test of the micro-electromechanical system (MEMS) fuze safety and arming mechanism. The proposed loading method has been successfully applied to ground simulation tests of the MEMS fuze safety and arming mechanism.
Highlights
Zhang et al [14] used an air gun to drive a centrifuge capable of starting instantly. e angle displacement of the specimen is controlled by a single-axis vector turntable. e
Qi et al [15] and Yang et al [16] proposed a method of removing fuze insurance based on the gas gun impact and rotating tube receipt. e pulse width of the overload acceleration is effectively prolonged by using foam aluminum as a buffer
A loading method of fuze 2D dynamic acceleration environments is proposed. e techniques of flywheel energy storage, high-speed impact, and centrifugal rotation in the track are combined based on dynamic analysis and a simulation. e designed loading system of a 2D dynamic acceleration environment is presented. e flywheel is driven to rotate at a set value by a variable-frequency motor in the system. e impact hammer is instantly released, striking the specimen at a high speed and loading the backseat acceleration environment
Summary
E backseat acceleration is produced by the impact hammer colliding with the test specimen at a high speed. E peak value and pulse width of the backseat acceleration are related to the flywheel speed. L where τ is the pulse width of the backseat acceleration, m denotes the test specimen mass with a buffer, and M is the equivalent mass of the flywheel. Equation (7) shows that the duration of the backseat acceleration pulse width relates only to the material and structure of the buffers, not the collision velocity. E flywheel speed range is set at 600− 900 r/min to simultaneously meet the requirements of both backseat and centrifugal accelerations. Calculation of the Brake Force and the Impact Hammer Mechanism. E centrifugal force (F0) on the impact hammer when the flywheel reaches the set value of 900 r/min is.
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