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排序方式: 共有49条查询结果,搜索用时 15 毫秒
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人字齿轮传动由于加工安装误差、轴承支撑布置无法对称等条件,不可避免会产生轴线的微量不平行。因人字齿轮齿宽较大、啮合刚度高、标准渐开线齿面线接触等特点,微量的轴线不平行度就会导致严重的齿面偏载,影响齿轮传动的平稳性和可靠性。因此,采用了小轮较大轴向浮动的轴承支撑结构,并研究了小轮轴向浮动的人字齿轮齿面承载接触仿真(LTCA)方法,通过大、小轮轴向固定和小轮轴向浮动两种不同轴承支撑结构的仿真比较,说明小轮轴向自位浮动可以有效改善齿面偏载,为人字齿轮传动系统的设计提供了参考。 相似文献
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XU Wujiao QIN Datong SHI Wankai State Key Laboratory of Mechanical Transmission Chongqing University Chongqing China 《机械工程学报(英文版)》2006,19(3):428-433
A direct digital design method (DDDM) of worm-gear drive is proposed. It is directly based on the simulation of manufacturing process and completely different from the conventional modeling method. The loaded tooth contact analysis (LTCA) method is analyzed, in which the advanced surface to surface searching technique is included. The influence of misalignment errors and contact deformations on contact zone and transmission error (TE) is discussed. Combined modification approach on worm tooth surface is presented. By means of DDDM and LTCA, it is very convenient to verify the effect of worm-gear drive's modification approach. The analysis results show that, the modification in profile direction reduces the sensitivity of worm-gear drive to misalignment errors and the modification in longitudinal direction decreases the TE. Thus the optimization design of worm-gear drive can be achieved prior to the actual manufacturing process. 相似文献
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To distinguish with the conventional tooth flank grinding only considering geometric accuracy, an innovative digital twin modeling is proposed for loaded contact pattern based grinding of spiral bevel gears. Where, data-driven grinding simulation, sensitivity analysis strategy, adaptive decision and control are developed. Focusing on loaded contact pattern optimization, numerical loaded tooth contact analysis (NLTCA) considering noncentrosymmetric problem and tooth flank roughness is developed for data-driven relationship establishment. Then, an adaptive data-driven tooth flank grinding decision and control model is established. Where, the universal motion concept (UMC) machine settings is selected as the optimal design variable. It is actually an infinite approximation to the target tooth flank in form of an adaptive control system. Moreover, with point-to-point material removal distribution, the different optimization strategies are proposed for accurate tooth flank grinding. In particular, the overcutting problem on the tooth flank grinding programming is investigated. Finally, Levenberg-Marquardt method is applied to solve the established nonlinear lease square model for the accurate machine tool settings having modification variations. Thus, this accurate data-driven digital twin modeling can achieve loaded contact pattern-based grinding. The provided numerical and test instances can verify the proposed digital twin modeling. 相似文献
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Face-gear drives have been applied in aviation transmissions, in particular, helicopter transmissions, and the lubrication characteristics are an important indicator for estimating the load-carrying capacity of face-gear teeth. In order to analyze the lubrication performance of the face gear under load, equations for the contact path of the face gear loaded tooth contact analysis (LTCA) were established on the basis of the load equivalent error of alignment (LEEA) and the load distribution among the teeth was calculated. Then a method for calculating the contact area and tooth surface velocity of face-gear drives was studied. Face-gear isothermal elastohydrodynamic lubrication (EHL) dimensionless equations are presented. A multigrid algorithm was used to complete the solution of the minimum film thickness and film pressure of face-gear drives. The lubricant film thickness and film pressure variation in the mesh cycle are expressed using example calculations that provide a theoretical basis for face-gear lubrication design. 相似文献
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该文首先建立联系天线阵元和加载网络的统一网络模型,把路与场统一于广义矩阵型欧姆定律之中。基于统一网络模型理论,采用矩量法(MoM)分析了加载匹配补偿网络的五元圆形测向天线阵列(FCADF)。研究表明,电路网络的加载,引入了新的路与场相互作用,可有效补偿天线单元之间的互耦影响,改善方向图不圆度特性,并实现阻抗匹配,从而提高了测向精度。此外,测向天线阵列中的局域谐振现象,通过加载网络也被有效抑制。 相似文献
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Misook Kang 《Korean Journal of Chemical Engineering》2008,25(4):933-938
This study examined carbon nanotubes (CNTs) with various outer diameters produced by the catalytic decomposition of acetylene
over Co-loaded zeolite Y. The CNTs were grown at differed reaction temperatures, reaction times, and acetylene concentrations.
In addition, the effect of the amount of Co dispersed over zeolite Y used as a support was determined. The shape and diameter
of the synthesized CNT were identified by SEM and TEM analyzers. As a result, CNTs with various outer diameters were synthesized
successfully. The average outer diameter of the synthesized CNTs increased with increasing amount of Co dispersed over zeolite
Y regardless of the reaction temperature and reaction time. The outer diameter did not change with acetylene concentration,
and the acetylene concentration was fixed to 10 cm3/min. Most of the CNT had large surface areas, >400 m2/g. The surface area increased with increasing outer diameter of the CNT until the outer diameter reached 60 nm but decreased
with further increases in outer diameter. 相似文献
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