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Analytical investigation of the pericyclic variable-speed transmission system for helicopter main-gearbox.

机译：直升机主变速箱周转变速系统的分析研究。

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摘要

In the recent years, there has been significant interest in the new developments and improvements of the rotorcraft transmission systems. The main goal of the rotorcraft transmission research is the reduction of overall gear train weight while maintaining the efficiency and reliability. The Pericyclic Variable-Speed Transmission (PVT) System is one of the potential candidates of the future rotorcraft drive trains to achieve these goals. Hence, this thesis explores the feasibility of the Pericyclic Variable Speed Transmission (PVT) for rotorcraft transmissions. The contributions of this research are grouped in two main categories. These two categories are in the component level and in the system level. These contributions are originated from the analysis of the Pericyclic Variable Speed (PVT) System. In the component level, a new concept of face-gear meshing is presented first time in the gear research field. The meshing of a face-gear with another face-gear is presented at high shaft angles as an alternative to bevel gears. The conjugacy of this new face-gear meshing concept is formulated and demonstrated. The geometry, unloaded mesh kinematics and loaded mesh kinematics of the conjugate meshing face-gear pair is analyzed. The physics behind the meshing face-gear teeth contact is revealed using theory of gearing, differentiable geometry and elastohydrodynamic lubrication theory. The existence of the lubricant film formation between the meshing teeth is demonstrated. The behavior of the sliding friction coefficient is analytically simulated through the meshing cycle. In the system level contributions, the Pericyclic Variable Speed (PVT) Transmission is presented as a new unique innovative gear train mechanism. The speed change capability is analyzed for rotorcraft demands. The power flow behavior is explored for its use in variable speed transmission systems. The established component level contributions are evaluated with the PVT at the system level. The efficiency and load carrying capacity of the PVT face-gears are analyzed at the helicopter torque levels. The dynamic motion of the nutating gear mechanisms is studied to capture the load carrying capacity of the PVT support bearings. A design analysis of the PVT system with 24:1 reduction ratio at 764HP power level is conducted to replace 3 reduction stages of the existing K-MAX intermeshing rotor transmission system. The design and analysis tools established in this research are applied in the design study. The achieved design is compared to the existing K-MAX transmission. Approximately 50% weight reduction and 70% volume reduction are accomplished with the PVT system with less than 1% lower efficiency than existing K-MAX drive train gears.
机译：近年来，旋翼飞机传动系统的新发展和改进引起了人们的极大兴趣。旋翼航空器变速器研究的主要目标是在保持效率和可靠性的同时减少齿轮总重。周转变速箱（PVT）系统是实现这些目标的未来旋翼机传动系统的潜在候选者之一。因此，本论文探讨了旋翼飞机变速器的周转变速箱（PVT）的可行性。这项研究的贡献分为两个主要类别。这两个类别分别在组件级别和系统级别。这些贡献源自对周转变速（PVT）系统的分析。在组件级别，在齿轮研究领域首次提出了一种新的面啮合方法。齿轮与另一个齿轮的啮合以较高的轴角呈现，可替代锥齿轮。提出并展示了这种新的齿轮啮合概念的共轭性。分析了共轭啮合面齿轮对的几何形状，卸载网格运动学和加载网格运动学。使用齿轮传动理论，可微几何学和弹性流体动力润滑理论揭示了啮合齿轮与齿轮之间接触的物理原理。证明了在啮合齿之间存在润滑膜形成。通过啮合循环对滑动摩擦系数的行为进行了分析模拟。在系统级别的贡献中，周转变速（PVT）变速箱是一种新颖独特的创新齿轮系机构。分析了旋翼飞机需求的变速能力。探索了其在变速传动系统中的使用性能。在系统级别使用PVT评估已建立的组件级别的贡献。在直升机扭矩水平下分析了PVT面具的效率和承载能力。研究了章动齿轮机构的动态运动，以捕获PVT支撑轴承的承载能力。对功率为764HP时减速比为24：1的PVT系统进行了设计分析，以取代现有K-MAX啮合转子传输系统的3个减速级。在这项研究中建立的设计和分析工具被应用于设计研究中。将获得的设计与现有的K-MAX传输进行比较。 PVT系统可实现大约50％的重量减少和70％的体积减少，其效率比现有的K-MAX传动系齿轮降低不到1％。

著录项

  • 作者

    Saribay, Zihni Burcay.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Aerospace.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 364 p.
  • 总页数 364
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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