无人机用森林灭火弹发射特性研究

Research on launch test of drone forest fire extinguishing projectile

为获得一种新型无人机用森林灭火弹的发射动力学特性,运用ANSYS-Workbench仿真软件建立无人机用森林灭火弹模型,讨论分析其前6阶的模态变化。为保证弹丸发射时的安全性,对无人机用森林灭火弹弹丸发射出膛时的瞬态动力学进行分析,为新型无人机用森林灭火弹的优化设计提供参考。结果表明:灭火弹发射出膛时弹丸的尾翼部最易发生形变,且出膛过程中弹丸在0.62 ms升至最大等效应力94 MPa,小于ABS工程塑料的许用应力,表明该无人机用森林灭火弹在最大应力下满足发射强度要求。

In order to obtain the launch dynamics of a new type of forest fire extinguisher for drones,the simulation software AN⁃SYS-Workbench was used to build a forest fire-fighting bomb model for drones,and the modal change of the first six orders was dis⁃cussed and analyzed.In order to ensure the safety of the projectile when it is launched,the transient dynamics of the projectile when it is launched out of the chamber was analyzed,to provide a basis for the optimal design of drone forest fire extinguishing projectile.The results showed that the tail fin of the projectile is most suscep⁃tible to deformation when the firearm is launched,and the projec⁃tile rises to the maximum equivalent stress of 94MPa at 0.62 ms during the exiting process,which is less than the allowable stress of the ABS engineering plastic.The fire extinguisher meets the emission intensity requirements under the maximum stress.