Abstract
The vibration of the barrel, induced by the interaction with a high-speed moving projectile, has a considerable influence on the shooting accuracy of a weapon. The finite element model of a multi-barrel was established with the goal to investigate its vibration characteristics in this paper, and the natural frequency and mode shape were analyzed by finite element method. To verify the result of finite element modal analysis (FEMA), a modal testing system basis on SC310W multi-path data-collecting system and hammer hitting method was set up. Results show that the low order vibrations of the multi-barrel artillery were mainly vertical, horizontal and torsional vibration, but the local vibration at high orders. The error of natural frequencies between the results obtained by simulation and test was 8.82 % in the first mode frequency and 1.37 % in the eighth. The FEMA can effectively simulate the actual vibration of the multi-barrel artillery.
Highlights
As a new type of artillery, the multi-barrel artillery has the advantages of high firing frequency, efficient mutilate ability, largest kill area, et al which make it a hotspot in present research on artillery field
To study the influence of structure parameters of the launcher on muzzle vibration, Ma [8] simplified the launcher to a 9 DOF system with five parts, and the effect of structure parameters on muzzle vibration displacement was discussed
The measurement of frequency response function is the key to vibration modal analysis, the coherence function should always be checked in the measurement of frequency response function
Summary
As a new type of artillery, the multi-barrel artillery has the advantages of high firing frequency, efficient mutilate ability, largest kill area, et al which make it a hotspot in present research on artillery field. The dynamic equation of multi-body system should be established to analyze the structure parameters of the launcher on muzzle vibration. Rui [11] studied the vibration characteristics of long range multiple launch rocket system by using transfer matrix method of multi-body system. In the modal analysis area, assuming linear and time invariant systems, the FRF matrix of an N-degree of freedom system can be expressed as: M{x(t)} + C{x(t)} + K{x(t)} = {f(t)},. Where [Φ] is the mode shape matrix, {q(t)} the displacement column vector of the modal coordinate. Combining with Eq (2) and Eq (8), the Fourier transform of the response at the lth DOF of the physical coordinates is:. We can identify all the modal parameters as long as the frequency response function matrix of any row or column is measured
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