發(fā)布時(shí)間：2018-07-24 15:06

【摘要】：為了使TMT三鏡系統(tǒng)具有跟蹤瞄準(zhǔn)功能,同時(shí)可以校正由于重力引起的結(jié)構(gòu)變形,設(shè)計(jì)一個(gè)大型的Stewart平臺(tái)來(lái)完成三鏡的Tilt調(diào)整。根據(jù)初始參數(shù)對(duì)并聯(lián)機(jī)構(gòu)進(jìn)行了位置反解的計(jì)算,并分別對(duì)支腿軸向力和剛度進(jìn)行了建模,最后使用了Matlab進(jìn)行優(yōu)化計(jì)算,得出一組最優(yōu)解。根據(jù)所求出的最優(yōu)解使用ANSYS建立了三鏡系統(tǒng)的參數(shù)化模型,并與Matlab聯(lián)合仿真,對(duì)三鏡系統(tǒng)的各個(gè)工況進(jìn)行了有限元模擬。仿真得到三鏡各個(gè)工作位置時(shí)的支腿的伸長(zhǎng)量、重力下的變形、第一階模態(tài)值以及六根支腿內(nèi)力。模擬結(jié)果顯示,最終設(shè)計(jì)的Stewart平臺(tái)支腿的最大變形量為0.813 mm,與優(yōu)化前的模型相比下降了20%;第一階模態(tài)最小值為16.7 Hz,與優(yōu)化前的模型相比上升了18%;六根支腿的軸向力最大值為27 219 N,相比優(yōu)化前下降了15.9%。
[Abstract]:In order to make the TMT three-mirror system have the function of tracking and aiming, and at the same time to correct the structural deformation caused by gravity, a large Stewart platform is designed to complete the three-mirror Tilt adjustment. According to the initial parameters, the position inverse solution of the parallel mechanism is calculated, and the axial force and stiffness of the supporting leg are modeled respectively. Finally, the Matlab is used to optimize the calculation, and a group of optimal solutions are obtained. According to the obtained optimal solution, the parametric model of the three-mirror system is established by using ANSYS, and the finite element simulation of the three-mirror system is carried out under each working condition of the three-mirror system by combined simulation with Matlab. The elongation of the leg, the deformation under gravity, the first mode value and the internal force of the six legs are obtained by simulation. The simulation results show that The maximum deformation of the designed Stewart leg is 0.813 mm, which is 20 times lower than that of the model before optimization, the minimum value of the first order mode is 16.7Hz, which is 18% higher than that of the model before optimization, and the maximum axial force of the six legs is 27,219. N, 15. 9% lower than before optimization.
【作者單位】： 中國(guó)科學(xué)院長(zhǎng)春光學(xué)精密機(jī)械與物理研究所;中國(guó)科學(xué)院大學(xué);
【基金】：中國(guó)科學(xué)院長(zhǎng)春光學(xué)精密機(jī)械與物理研究所三期創(chuàng)新工程專項(xiàng)基金
【分類號(hào)】：TH751

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