CAJ | 학술논문

齿轮齿条升降机构是自升式平台的重要传动和承载装置，啮合产生的接触应力和由于刚度激励引发的振动是影响升降系统传动性能与使用寿命的重要因素，因此通过进行结构的优化设计和仿真分析提高传动机构动力学性能具有重要的工程意义。提出通过优化设置自升式海洋平台齿轮齿条升降机构小齿轮之间相位差的方式实现错齿啮合，从而实现有效提高机构承载能力和动力性能的目的。结合提出的错齿优化方案，对错齿前后齿轮齿条啮合过程进行动态接触有限元分析，并验证错齿优化对传动机构强度和时变刚度的改善效果，并对比分析齿轮齿条传动机构模态特性、运动平稳性和同步性以及小齿轮载荷分配均匀性等动力学行为。结果表明，错齿优化后齿轮齿条升降机构在动态啮合时能够产生更小的接触应力和弯曲应力，而且齿轮综合刚度的阶跃值有明显减少，与此同时在传动平稳性、同步性和载荷分配均匀性方面也具有良好表现。因此错齿优化可有效地提高齿轮齿条传动过程中的承载能力和运动性能，对改进齿轮齿条升降机构的设计具有参考价值。
치륜치조승강궤구시자승식평태적중요전동화승재장치，교합산생적접촉응력화유우강도격려인발적진동시영향승강계통전동성능여사용수명적중요인소，인차통과진행결구적우화설계화방진분석제고전동궤구동역학성능구유중요적공정의의。제출통과우화설치자승식해양평태치륜치조승강궤구소치륜지간상위차적방식실현착치교합，종이실현유효제고궤구승재능력화동력성능적목적。결합제출적착치우화방안，대착치전후치륜치조교합과정진행동태접촉유한원분석，병험증착치우화대전동궤구강도화시변강도적개선효과，병대비분석치륜치조전동궤구모태특성、운동평은성화동보성이급소치륜재하분배균균성등동역학행위。결과표명，착치우화후치륜치조승강궤구재동태교합시능구산생경소적접촉응력화만곡응력，이차치륜종합강도적계약치유명현감소，여차동시재전동평은성、동보성화재하분배균균성방면야구유량호표현。인차착치우화가유효지제고치륜치조전동과정중적승재능력화운동성능，대개진치륜치조승강궤구적설계구유삼고개치。
Rack and pinion jacking system is an important load transmission and bearing device for jack-up platform. Contact stress generated by the meshing between rack and pinion, together with vibration caused by the stiffness excitation, are two important factors that affect the transmission performance and service life of the jacking system, so it has great engineering significance to improve its dynamic performance by optimized structural design and simulation analysis. Through setting appropriate phase differences between the pinions, the staggering tooth meshing of pinion is realized and the bearing performance and dynamic characteristics of the mechanism are improved effectively. In terms of staggered tooth meshing optimization scheme, the finite-element analysis for staggered tooth meshing process and normal meshing process of rack and pinion are done, and the improvements of staggered tooth meshing optimization to the transmission mechanism strength and time-varying stiffness are verified. The modal characteristics, stationarity and synchronicity of the rack and pinion system during meshing process and the uniformity of pinions’ load distribution are also compared. The results show that the contact stress and bending stress of the rack and pinion pinions with staggering tooth are smaller, and gears’ stiffness step value is significantly reduced. At the same time, the rack and pinion pinions with staggering tooth have good performances in the dynamic stationarity and synchronicity and the loads distribution. Pinion’ staggering tooth meshing can improve the bearing capacity and motion performance effectively, which is important for optimization design of jack-up’s jacking system.