Results 21 to 30 of about 7,227 (196)

Reverse Design of Solid Propellant Grain for a Performance-Matching Goal: Shape Optimization via Evolutionary Neural Network

Aerospace, 2022
The reverse design of solid propellant grain for a performance-matching goal, one of the most challenging directions of the solid rocket motor designing work, is limited by the traditional semi-empirical parameter-driven optimization methods based on ...
Wentao Li, Wenbo Li, Yunqin He, Guozhu Liang   +3 more
doaj   +1 more source

Structural Integrity Analysis and Experiment of Motor Grain under Low Temperature Ignition [PDF]

Hangkong bingqi, 2021
In order to evaluate the security coefficient of certain solid rocket motor (SRM) grain under low temperature ignition, the simulation and test of SRM grain structural integrity are carried out.
Li Yexin, Zhi Shijun, Wang Hugan, Xiao Zhiping
doaj   +1 more source

Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties

, 2003
In this paper we present the results of the synthesis and characterisation of nanocrystalline La1-xNaxMnO3+delta samples. Two synthetic routes were employed: polyacrylamide-based sol-gel and propellant synthesis.
Balcells L., Balcells L., Boix T., Causa M. T., Coey J. M. D., Douy A, Gupta A., Helman J. S., Herrero E., Horyn R., Hwang H. Y., Li R.-W., Li X.-H., Mahendiran R., Malavasi L., Malavasi L., Mathur N. D., Muori M., Nagata K., Ng-Lee Y., Oseroff S. B., Pechini M. P. U.S., Ritter C., Roy S., Sanchez R. D., Shannon R. D., Singanahally T. A., Spinolo G., Tonejc A. M., Töpfer J., van Roosmalen J. A. M.   +30 more
core   +1 more source

Investigations of the mechanical response of dummy HTPB propellant grain under ultrahigh acceleration overload conditions using onboard flight-test measurements

Defence Technology
In this paper, to study the mechanical responses of a solid propellant subjected to ultrahigh acceleration overload during the gun-launch process, specifically designed projectile flight tests with an onboard measurement system were performed.
Yiming Zhang, Ningfei Wang, Weihua Ma, Ran Wang, Long Bai, Yi Wu   +5 more
doaj   +1 more source

Effect of cyclic loads on structural damage of rocket propellant grain [PDF]

Scientific Technical Review, 2019
Rocket motor propellant grain, cast or bonded into the motor chamber or solid coating, is exposed to various loads during its service life. Rocket propellant is a viscoelastic material, whose mechanical properties strongly depend on temperature and ...
Gligorijević Nikola, Rodić Vesna, Pavković Bojan, Bogdanov Jovica, Živković Saša, Bajić Zoran   +5 more
doaj  

Mechanical properties of thermal aged HTPB composite solid propellant under confining pressure

Defence Technology, 2022
With the purpose of investigating the effects of confining pressure and aging on the mechanical properties of Hydroxyl-terminated polybutadiene (HTPB) based composite solid propellant, tensile tests of thermal accelerated aged propellant samples under ...
Zhe-jun Wang, Hong-fu Qiang
doaj   +1 more source

Study on the Ignition Process and Characteristics of the Nitrate Ester Plasticized Polyether Propellant

International Journal of Aerospace Engineering, 2020
In this study, a CO2 laser ignition experimental system was built to study the ignition process and characteristics of the Nitrate Ester Plasticized Polyether (NEPE) propellant.
Xiaoting Yan, Zhixun Xia, Liya Huang, Likun Ma, Xudong Na, Yunchao Feng, Chuanbo Fang   +6 more
doaj   +1 more source

Thermal and acceleration load analysis of new 122 mm rocket propellant grain [PDF]

Scientific Technical Review, 2016
In order to achieve very strong inter-ballistic requirements, a unusual free standing rocket motor propellant grain was designed, with variable channel diameter.
Gligorijević Nikola, Antonović Saša, Živković Saša, Pavković Bojan, Rodić Vesna   +4 more
doaj  

Structural Integrity Analysis of Nozzleless Booster Propellant Grain in the Process of Curing and Cooling [PDF]

Hangkong bingqi
In order to accurately evaluate the structural integrity level of the solid rocket ramjet nozzleless booster propellant grain during curing and cooling, the structural integrity of the nozzleless booster propellant grain of a solid rocket ramjet engine ...
Kui Bin, Liu Qiang, Na Xudong, Liu Jue
doaj   +1 more source

Computational Technique for Crack Propagation Simulation in Viscoelastic Solid Propellant

International Journal of Aerospace Engineering, 2023
To further investigate the fracture response in propellant grain, numerical methodology is proposed to cope with crack propagation simulation especially for the mixed mode condition.
Qiangqiang Jiang, Xuan Lv, Huiru Cui, Teng Ma   +3 more
doaj   +1 more source