Research On Blast Wave Test System Dynamic Characteristics And Test Position Optimization In Static Explosion Field

The parameters of explosive shock wave are the main basis for judging the damage power of warhead.The accuracy of test data and the integrity of reconstructed shock wave field from limited test points directly affect the accurate evaluation of weapon and ammunition performance.The purpose of this paper is to obtain accurate and more shock wave field overpressure information through finite measurement points.Based on the existing shock wave test recorder,beginning with the performance optimization of the test recorder,and the influence of the cutoff frequency of the piezoelectric pressure sensor on the shock wave test is studied.The dynamic characteristics of the test recorder and the characteristics of the shock wave signal were studied,and the dynamic characteristics of the whole test system were compensated.At the same time,in order to make better use of limited measurement points to capture accurate shock wave field information,the install and layout optimization of test points were studied.Through the analysis of the piezoelectric adapter,the corresponding transfer function is obtained,and the ideal signal of shock wave with different rise time and different positive pressure time is constructed by using the Brode attenuation empirical formula.Using MATLAB software to simulate,change the adapter parameters to obtain the influence of the adapter on the shock wave test under different cutoff frequency conditions.It is found that when the high-cut cutoff frequency of the adapter is less than 0.09 Hz and the low-pass cutoff frequency is greater than 150 kHz,the absolute values of the three key parameters of the peak value,the specific impulse and the positive pressure action time after the shock wave signal passes through the adapter are less than 2%.The step signal generated by the shock tube is used to excite the dynamic characteristics of the test device,and the test system is identified by the radial basis function neural network.The ideal shock wave signal and radial basis function are used to compensate the test system offline,and a good correction effect is obtained.The ANSYS/LS-DYNA software is used to simulate the influence of different relative heights of the sensor installation plane and the ground on the test.When the relative height is within ±1cm and the absolute value of the relative height is equal,the error of the installation plane below the ground is less than the error above the ground,which provides a reference for the layout of the device.Based on the assumption of the ideal,shock wave field,Shock wave test layout optimization scheme based on particle swarm optimization is proposed.The scheme is based on the actual test layout method,test error and device damage.The average error of the peak and ideal peak of the finite measurement point is taken as the fitness function.The particle swarm optimization algorithm is used for global search to obtain the optimal layout of the device.