In this study, we focused on the effect of underwater explosion parameters multi-point array explosion. The shock wave and bubble aggregate charge, two charges, four charges were measured through an test, their influence power field charge quantity distance was analyzed. Results show that multi-shock collision can be approximated to a linear superposition, interaction delayed deemed as increase baseline. Shock focusing superposition peak pressure. Compared with greater number points is,...

This study examines the processes of expansion, merging, and collapse multiple underwater explosion bubbles through experimental numerical methods. A small-scale experiment was conducted in a water tank. The behaviors three four during were captured using high-speed photography, effects quantity spacing explosive charge on bubble dynamics analyzed. results indicate that evolution behavior explosions, including period radius, is significantly influenced by between charges. With decrease ratio...

This paper is concerned with optimal motion planning for vibration reducing of free-floating flexible redundant manipulators. Firstly, dynamic model the system established based on Lagrange method, and proposed. Secondly, a hybrid optimization approach employing Gauss pseudospectral method (GPM) direct shooting (DSM), proposed to solve problem. In this approach, problem transformed into non-linear parameter using GPM, genetic algorithm (GA) employed locate approximate solution. Subsequently,...

Abstract Numerous studies have shown that highly strain‐rate dependent behavior is present in the mechanical properties of Hydroxyl‐terminated polybutadiene(HTPB)propellants, and many experts scholars attempted to develop constitutive models describe such rate‐dependent propellants. From linear viscoelastic model Zhu‐Wang‐Tang model, materials been described some extent. But due nonlinear exhibited propellant materials, propellants at different strain rates difficult be captured above which...

The multiple coupling of composite laminates has a unique advantage in improving the macro mechanical properties structures. A total three hygro-thermally stable multi-coupled with extension-twisting were presented, which conducive to formation passive adaptive Then, used design bending-twisting coupled box structure, configuration laminate and structure could be extended variable cross-section configuration. optimal stacking sequence was realized, optimization objectives maximize laminate,...

Based on the bolted flange connection structure between stages of missiles, four experimental specimens are simplified and manufactured, transverse impact failure experiments drop hammer designed carried out in this study. During experiments, a new signal sensor is to collect data bolts force, response such as slotted displacement connecting interface, force collected loading process. The sequential mechanism under load analyzed demonstrated according results measured data. Additionally,...

All relevant key techniques involved in photogrammetric vision metrology for fully automatic 3D measurement of large-scale structure are studied. A new kind coded target consisting circular retroreflective discs is designed, and corresponding detection recognition algorithms based on blob clustering presented. Then a three-stage strategy starting with view proposed to achieve network orientation. As matching noncoded targets, the concept path proposed, matches each found by determination...

The introduction of hybrid composites into the structure with coupling effect can greatly reduce cost materials. expressions stiffness coefficient, thermal stress, and moment for laminates are derived based on geometrical factors laminates, necessary sufficient conditions extension-shear-coupled immunity to hygrothermal shear distortion (HTSD) further derived. is optimized improved differential evolution algorithm. Results presented that consist carbon fiber glass composite simulated...