CAJ | 학술논문

30 m口径望远镜(TMT)的三镜跟踪系统(M3PA)的运动性能和指向精度指标均高于已建成的各大望远镜，且工况复杂多变，给设计人员带来了巨大的挑战。三镜跟踪系统包括Rotator轴和Tilt轴两部分。重点研究了Tilt轴轴承布置方案以及相应分析。提出了两种轴承方案，经过分析，使用一对双列角接触转盘轴承的方案更适合于Tilt轴的工作需要，此时结构第一阶谐振频率可达到15.1 Hz，满足Tilt轴的设计要求。选定方案后，针对所选择的轴承，使用ANSYS进行了仿真。仿真结果显示，所选轴承中滚动体的最大承载达到5000 N ，最大应力大约为2300 MPa ，承载曲线满足经典余弦分布，从而证明仿真数据可靠，模拟方法可信；另外四列滚动体上都有明显的承载，从而说明所选择的轴系能够很好地将载荷分散到两侧结构架上。分析结果表明，这种结构形式能够满足TMT三镜系统对刚度要求。
30 m구경망원경(TMT)적삼경근종계통(M3PA)적운동성능화지향정도지표균고우이건성적각대망원경，차공황복잡다변，급설계인원대래료거대적도전。삼경근종계통포괄Rotator축화Tilt축량부분。중점연구료Tilt축축승포치방안이급상응분석。제출료량충축승방안，경과분석，사용일대쌍렬각접촉전반축승적방안경괄합우Tilt축적공작수요，차시결구제일계해진빈솔가체도15.1 Hz，만족Tilt축적설계요구。선정방안후，침대소선택적축승，사용ANSYS진행료방진。방진결과현시，소선축승중곤동체적최대승재체도5000 N ，최대응력대약위2300 MPa ，승재곡선만족경전여현분포，종이증명방진수거가고，모의방법가신；령외사렬곤동체상도유명현적승재，종이설명소선택적축계능구흔호지장재하분산도량측결구가상。분석결과표명，저충결구형식능구만족TMT삼경계통대강도요구。
The tertiary mirror pointing assembly(M3PA) of the thirty meters telescope(TMT) is the largest tertiary mirror in the world. The tracking and pointing performance of M3PA is better than any other telescopes which have been built, and the working condition is even worse. So the designers face an enormous challenge. The tracking system includes the bottom rotator axes and the tilt axes. The study of this paper focused on the tilt axes. There were two bearing arrangement methods for the tilt axes. The first one used two single angular contact bearing to stand the shaft. The second used two double rows angular contact bearings. They both met the requirement when the M3PA was vertical. But the first method became invalid when the M3PA was horizontal, while the second can provide a better support about 15.1 Hz of the first modal frequency. Then some FEA were done to find out the carrying capacity of the bearings. The results show that the maximum load applied on the rollers is up to 5 000 N, while the maximum stress is up to 2 300 MPa. Otherwise, the load distribution just likes a cosine curve. So it can be found that the analysis is believable. In addition, there are evident load applied on the four rows rollers, which proves that the bearing arrangement can disperse the load effectively. It can be concluded that the selection of the bearing arrangement is a good choice for TMT tilt axes design.