Simulation-based high-G-value broad pulse impact waveform design method

Abstract

The invention discloses a simulation-based high-G-value broad pulse impact waveform design method. The simulation-based high-G-value broad pulse impact waveform design method comprises the following steps: firstly, making impact wave index requirements and design variable to be clear, and calculating relative density of an aluminum honeycomb core in an aluminum honeycomb sandwich plate; secondly,establishing a projectile penetration impact-reduction numerical experimentation model according to the design variable and carrying out parameter experiments to obtain a curve of accelerated speed changed along with speed under aluminum honeycombs with different relative densities; thirdly, fitting penetration coefficients of different buffer materials to obtain cavity expansion model equations of the different materials, then calculating required impact initial speed and the speed and the accelerated speed of projectiles moving to the center point of each aluminum honeycomb sandwich plate, and substituting the speeds and the accelerated speeds into the cavity expansion model equations of the different materials to obtain the relative density value of each aluminum honeycomb core; and finally, inputting the relative density values into projectile penetration impact-reduction numerical experimentation model to obtain high-G-value wide-pulse impact waveform. The simulation-based high-G-value broad pulse impact waveform design method is suitable for impact wave waveform design in various standards; and the design period is short, the design method is speedy, and the efficiency is high.

Description

technical field [0001] The invention belongs to the field of shock tests, and in particular relates to a simulation-based design method for high-G-value wide-pulse shock waveforms. Background technique [0002] In the field of military industry, during the penetration process of the projectile, the fuze has to experience a high-amplitude acceleration overload with a duration of several milliseconds and an amplitude of tens of thousands of g. During the development of the fuze system, a high-g-value acceleration simulation environment is urgently needed for assessment. The working status and survivability of key components such as the fuze system, study its dynamic response and verify the reliability of the smart (smart) fuze. In the field of national economy, especially in many advanced industrial fields, a high-amplitude acceleration environment is also required. For example, the motion analysis of high-speed trains: the effect analysis of the buffer design when the specia...

AI Technical Summary

Problems solved by technology

However, this method generates impact loads through the transmission of two contact forces, which not only causes energy loss, but also cannot control the impact waveform more accurately, and has many limitations in actual operation.

Therefore, for the impact test environment design of a certain index, a large number of tests are required at this stage, which is expensive and has a long design cycle, making it difficult to meet the demand

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