A Simulation-Based Design Method of High-g-value Wide Pulse Shock Waveform

Abstract

The invention discloses a simulation-based design method for high-G-value wide-pulse shock waveforms. First, the shock wave index requirements and design variables are clarified, and the relative density of the honeycomb aluminum core in the honeycomb aluminum sandwich panel is calculated; The parameter test of the impact numerical test model is carried out to obtain the curves of acceleration versus speed under different relative densities of honeycomb aluminum; then the penetration coefficients of different cushioning materials are fitted to obtain the cavity expansion model equations of different materials, and then the required impact initial velocity is calculated As well as the velocity and acceleration of the projectile moving to the midpoint of each honeycomb aluminum sandwich panel, the relative density value of each honeycomb aluminum core is obtained by substituting the cavity expansion model equation of different materials; finally, the relative density value is input into the projectile penetration reduction The shock numerical test model obtained a high G value wide pulse shock waveform. The invention is applicable to the design of shock wave waveforms of various standards, has short design period, convenient design method and high efficiency.

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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