Numerical Simulation of Launch Tube Based on Container type Missile Launch Technology

Transcription

1 Avaiabe onine at Proceia Engineering 31 (2012) Internationa Conference on Avances in Computationa oeing an Simuation Numerica Simuation of Launch Tube Base on Container type issie Launch Technoogy Jin-zhu Yang a, Zhao-fei Wang b* a Schoo of Architectura, Engineering University of CAP, Xi an, Shanxi, , China. b Schoo of Equipment & Transport, Engineering University of CAP, Xi an, Shanxi, , China Abstract Accoring to the features of container type missie aunch technoogy for muti-barre rocet, combine with nonetha weapons in the fie of appication, a new concept about the aunching unit for anti-riot rocets, which was the integration of storing an aunching non-etha rocets, was propose. The oa bearing on the auncher was anayze an engineering pastics were seecte as aunch tube materias. Combine the computer aie esign software Pro/Engineer with the finite anaysis software ANSYS, the numerica simuation of the aunch tube was create. To ensure the aunch tube esign accoring with the theoretica esign requirements, the stress an ispacement of the aunch tube uner the maximum oa were anayze in comparison. The resuts refecte that the stiffness an intensity of aunch tube can fuy meet the nees for aunching Pubishe by Esevier Lt. Seection an/or peer-review uner responsibiity of Kunming University of Science an Technoogy pen access uner CC BY-NC-ND icense. Keywors: numerica Simuationcontainer type missie aunchaunch tube non-etha weapons 1. Introuction The tube of Container irectiona evices is a new type irectiona tube which becomes popuar in recent years. The irectiona tube of this form can be use as rocet aunch irectiona tube, an aso, can be use as a container for usua rocet storage an transportation. Usuay rocet aunche by this way cae container type missie aunch. The anti-riot fire unit base on container type missie aunch technoogy * Corresponing author. Te: E-mai aress: @qq.com Pubishe by Esevier Lt. oi: /j.proeng pen access uner CC BY-NC-ND icense.

2 Jin-zhu Yang an Zhao-fei Wang / Proceia Engineering 31 (2012) compare with other ispersing weapons serving in the arme poice force can improve the emergency response capabiity an firepower mobiity. As container aunching evice has a feature that the evice wi be thrown own whie aunching is over, consiering the benefits of operationa effectiveness an economic efforts, the materia choose an structura anaysis are neee to one we. In the process of moeing an numerica simuation for the tube in this paper, the three-imensiona software Pro-Engineering an the finite eement anaysis software ANSYS are use to anayse the forces on the tubes to ensure the strength of irectiona evice meets the esign requirements, through which can provie a theoretica basis. 2. Stress Anaysis of Launchers Whie the evice of auncher is aunching, rocet aunchers from the ignition to the eft can be ivie into ocup, constraints an freeom of fight perio. After ignition, the rocet acts on the ocing mechanism uner the thrust of engine, breas the ocing force, begins with ocing evice into the restraint perio. During the restraint perio, coision contact occurs between the rocet an the tube, ue to the affects of the rocet thrust misaignment, the weight istribution an other factors, the rocet brings power oa on the auncher. At the moment of the rocet eft, the rocet engine auncher gas fow wi prouce a arger impact on the aunching evice Engine Thrust [1] The tota thrust that the engine on the rocet can be expresse as =qmu ge+ Se( pe pa) (1) In equation (1), q m stans for the rocet mass fow rate, u ge stans for the projectie veocity of rocet jet reative to the missie. S e is for the jet pipe area, p e is for the gas pressure of the en exports. p a is for the atmospheric pressure. The thrust has two parts, the first part is the previous item, which is cae ynamic thrust that is generate by the gas momentum change an usuay occupies 90% of the tota thrust. The secon part is cae static thrust which is ue to air pressure an the en exports cause by ifferent atmospheric pressure outsie Thrust misaignment an uneven weight istribution cause by ynamic oas [2] Whie the rocet an the tube are in the fu constraint perio, the stress anaysis between the rocet an the tube are shown in the igure 2-1, in which is centroi, is the coorinate system of the rocet, is the corner of the rotation. In accorance with the principe of the static metho, the force baance equation aong the axis y H an the torque baance equation aroun axis z H are as foows. cos sin cos sin 0 cos rsin cos ma1 ( S sin S cos ) 0 (2) ma ( sin cos ) 0 1 S S

3 304 Jin-zhu Yang an Zhao-fei Wang / Proceia Engineering 31 (2012) In the equations above, an are the counter-force an torque which are cause by the uneven istribution of thrust misaignment an quaity in the vertica pane. S is the offset that is the actua center of mass reative to the iea centroi. rocets for the equatoria pane of the intersection of G, then G is the thrust misaignment L, then L L L L 3 In equation (3), is the connection ength for the point K to the. Since the aunching unit is mainy use for surface combat, the firing accuracy an fight stabiity of the anti-riot rocet are emane ess. So, the rocet in the tube is not rotate, then, the autobiography parameter in equation (2) is zero. Whie put equation (2) into equation (3) which can be simpifie as foows. Lcos( ) (1 ) Lcos( ) ma cos( ) 4 L 1 S S or the case of semi-constraine perio, as shown in igure 2-2, simpifie an to point that is the mie point of the tube. Consiering the maximum an may appear, accoring to reference [2], EL 4 4( 1) E 4maE L 1 S In equation (5), E L an E S are the mie eviations of thrust eccentric an the static imbaance. X X 5 x z H ma 1 y H s 0 x z H y H ma 1 s 0

4 Jin-zhu Yang an Zhao-fei Wang / Proceia Engineering 31 (2012) oeing an simuation 3.1. Conitions of estabishment The requirements for the stiffness an strength of the tube for aunching no-etha rocets are ower. Consiering the ightweight an economic requirements for the aunching unit, choose high-ensity poyethyene as the materia of the tube. Its eastic mouus, ensity, tensie strength an compressive strength are 0.6GPa, 0.95g/cm 3, 30Pa an 21Pa. The aowabe stress of the tube is shown in equation (6). 0 [ ] 6 n Whie n equas 1.1, then =19Pa. The ength of the tube is 320mm, the iameter is 45mm an its wa thicness is 3mm inite eement moe The process of finite anaysis is shown in igure n Three-imensiona moeing Given constraints an oa Input the parameters of materia eshing Dispay output Create the tube moe in the software of Pro-Engineer an put the moe to Ansys using the seamess connectivity between Pro-Engineer an Ansys. In the software Ansys, efinite the unit type of the tube to be soi bric 8noe 45, then input the parameters of materia an meshing the tube moe. The moe is meshe into 1500 ce ivisions which is shown in igure 3-2.

5 306 Jin-zhu Yang an Zhao-fei Wang / Proceia Engineering 31 (2012) esuts an anaysis Accoring to the force curve of the tube, seect the maximum position of stress, at the same time put the static anaysis on x, y an z irections. With the coorinate system estabishe, oing ispacement an equivaent stress anaysis to the 80mm, 120mm an 200mm of the tube, as shown in igure 3-3.

6 Jin-zhu Yang an Zhao-fei Wang / Proceia Engineering 31 (2012) Through the anaysis of the ispacement an the equivaent stress of the tube in Comparison, the maximum ispacement is 0.973mm an the equivaent stress is 4.7Pa, as a resut, the engineering pastics seecte can fuy meet the esign requirements. The ispacement of the mie tube is bigger than the ispacement of the ens. But the equivaent stress is concentrate in the mie an both ens of the tube. Whie esigning, consieration shou be focuse on the strength of this ocation. 4. Concusion As to the moeing an finite anaysis of the tube, concusions can be rew as foows. (1) Engineering pastic use as the materia of the tube can fuy meet the requirements of the strength for aunching non-etha anti-riot rocets, an aso, they can meet the requirements of ightness an economy. (2) Accoring to the resuts of the finite anaysis, reasonabe optimizations can be rew to the form, structure an economic inicators of the tube. At the same time, the number of the trias an financia expeniture can be reuce. eferences [1] Zhang Bo-sheng, Li Yun-e. Principes of artiery an rocet baistic []. Beijing: Pubishing Company of Beijing University of Science an Technoogy, [2] Li Jun. Designing for rocet aunching system []. Beijing: Pubishing Company of Nationa Defense Inustry, [3] Wang Guo-ye. Pro/ Engineer 5.0 Chinese mechanica esign[]. Beijing: Pubishing Company of achinery Inustry, 2009.