Research Of Structure Stability Theory And Methods On Precision Tilled Grating

Inertial confinement fusion (ICF) is a frontier research field of controlledthermonuclear fusion today. ICF is a large, complicated optic and fine mechanicalsystem. In order to guarantee the fine spot position for the laser beams, only by adjusteach component cannot meet that, structure design and engineering execution should beoverall considered. Precision grating tiling device, as the core part of the ICF device toobtain high power laser pulse, its stability is very important for the beam line direction.For ensure the beam line direction and improve the performance of ICF facility, thestability of precision grating tiling device must be researched.In this paper, the main structural parameters which influence the structure stabilitywere discovered, and the measures to improve the structure stability were put forward.These results were obtained from the research of ICF facility compressor based on thestructure stability theory and diffraction grating principle. On this basis, the principlesample machine was designed, which adopted the high structure stability tetrahedraltruss as the supporting. By means of elimination the error magnification factor coursedby mechanism, the device assembly accuracy was optimized and its accuracy wasimproved, based on differential mechanism accuracy design method. With the finiteelement methods, the mode analysis was performed for the grating tilling device. Theresults show that the device first order natural frequency cannot meet the structurestability demands, the weakness components were support plate, vertical rod andinclined rod. Device first ten order vibration mode cloud pictures show that stabilityweakness components bending strength is not enough. The change law of the first ordernature frequency and the components dimension parameter was analyzed. Thenaccording to the law, the optimized parameters were found and the stability optimizationscheme of precision grating tiling device was presented. It is analyzed that the mode andrandom vibration analysis results can meet the demands, by using this optimizedstructure.The stability experiment results show that rotate of X and Y axis response angle are0.243radand1.46103rad. It is conclude that the device can meet the demandsand Y axisymmetric can improve the rotate of Y axis stability, which lays a foundationof future structure design.In this paper, precision grating tilling device stability was researched and the measures to improve the structure stability were put forward, which have guidingsignificance for the structure stability design of the future grating tilling device or otherdevice.