失去润滑条件下直升机弧齿锥齿轮传动系统温度场研究

发布时间：2018-10-17 18:48

【摘要】：在现代战争中，武装直升机执行着对地攻击、火力支援、空中格斗、侦察、护航等重要军事任务，其所发挥的巨大威力和不可替代的作用已为世人所公认。然而，在防空力量日趋加强的今天，武装直升机在执行战斗任务的同时，又将面临一个从天上到地面多方位、多种类的被探测与被攻击的战场环境，从而使其战场生存能力受到严重威胁。当武装直升机传动系统在作战中中弹漏油后，将出现失去润滑的极端工况。在这种情况下，传动系统的工作时间决定着直升机的战场生存能力和机组人员的生命安全。因此，基于武装直升机传动系统生存能力的要求，开展失去润滑条件下直升机传动系统温度场分析研究是非常必要的，它是研究改善传动系统传动性能和提高抗失效能力的重要途径，其可能的研究成果有助于我国武装直升机战场生存能力设计研究，并可推广到车辆、船舶、飞机等其它民用和军用机械装备领域，具有巨大的应用和经济价值。本文以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象，基于齿轮啮合原理、摩擦学、传热学和热网络法等理论，对弧齿锥齿轮传动系统的发热机理、传热过程及温度场分布进行了分析研究，主要研究内容和成果如下： 1、对热网络节点进行分类说明，并设立节点划分原则。以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象，根据其各零部件间的传热换热关系，对其进行节点布置，构建热网络模型，并建立其节点温度平衡方程组。 2、将弧齿锥齿轮等效为当量直齿圆柱齿轮，并综合考虑齿轮传动过程中啮合点相对滑动速度、法向载荷、摩擦系数等时变性因素和实际重合度的影响，建立弧齿锥齿轮摩擦功率损失计算模型。另外，考虑热空气物性参数随温度变化的影响，建立不同润滑状态下的滚动轴承摩擦功率损失计算模型。 3、建立正常润滑及失去润滑条件下的弧齿锥齿轮传动系统热阻和对流换热系数计算模型。其中，失去润滑条件下与热空气之间的对流换热系数计算模型因考虑了热空气物性参数随温度变化的影响而具有时变特性。 4、以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象，建立其正常润滑条件下的温度场Simulink仿真计算模型。基于该模型，计算获得该齿轮传动系统在正常润滑条件下的温度场随时间的变化曲线，并提取出其稳态温度场分布作为失去润滑条件下瞬态温度场预测的初始条件。 5、以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象，建立其失去润滑条件下的温度场Simulink仿真计算模型。基于该模型，以正常润滑条件下稳态温度场为初始条件，计算了其在失去润滑条件下瞬态温度场，分析了各节点温度随时间的变化规律。 6、首次将Simulink软件用于仿真求解弧齿锥齿轮传动系统温度场。该方法不仅可以计算获得温度场的平衡值（稳态温度场），，还可以预测温度场的时变过程（瞬态温度场），为进行齿轮传动系统温度场分析研究提供了一种新思路。
[Abstract]:In the armed conflict, armed helicopters carry out important military tasks such as ground attack, fire support, air combat, reconnaissance, escort and other important military tasks, and the great power and irreplaceable role played by them has been recognized by the world. However, with the increasing strength of air defense, the armed helicopter will face a multi-faceted and multi-species detection and attack battlefield environment from the sky to the ground while carrying out the combat mission, so that the survivability of the battlefield is seriously threatened. The extreme operating conditions of loss of lubrication will occur when the helicopter transmission system has been shot in combat. In this case, the working time of the transmission system determines the battlefield survivability of the helicopter and the life safety of the crew. Therefore, based on the requirement of survivability of helicopter transmission system, it is necessary to study the temperature field analysis of helicopter transmission system under the condition of loss of lubrication. It is an important way to study the transmission performance of transmission system and improve the anti-failure ability. The possible research results will contribute to the design and study of the battlefield survivability of armed helicopters in China, and can be extended to other fields of civil and military machinery equipment such as vehicles, ships, aircraft and so on, with great application and economic value. Based on the theory of gear meshing principle, tribology, thermography and thermal network method, the heating mechanism, heat transfer process and temperature field distribution of arc gear drive system are analyzed based on the theory of gear meshing principle, tribology, continuum theory and thermal network method. Research, main research content and results 1. Classify the hot network node and set up the section Based on the relationship between the heat transfer and heat transfer among the parts, a thermal network model is constructed and its node temperature is established. According to the balance equation, the arc tooth bevel gear is equivalent to the equivalent straight tooth cylindrical gear, and the influence of the meshing point relative sliding speed, the method to the load, the coefficient of friction and the like in the gear transmission process is comprehensively considered, and the friction of the arc tooth bevel gear is established. In addition, in consideration of the influence of the physical parameters of hot air over temperature, rolling bearing friction under different lubrication conditions is established. Calculation model of power loss. 3. Establish the thermal resistance of arc tooth bevel gear transmission system under normal lubrication and loss of lubrication condition. and a convection heat exchange coefficient calculation model, wherein the calculation model of the convection heat exchange coefficient between the hot air and the hot air under the condition of loss of lubrication changes the physical parameters of the hot air with the temperature In this paper, the temperature field under normal lubrication condition is established by using the bevel gear transmission system of the tail reducer of a helicopter as the research object. Based on the model, the change curve of the temperature field over time under normal lubrication condition is calculated and the steady-state temperature field distribution of the gear transmission system is extracted as the loss lubrication strip. The initial conditions of the transient temperature field prediction under the condition are as follows: 5. The transmission system of the bevel gear of the tail reducer of a type of helicopter is used as the research object, and the condition of loss of lubrication is established. Based on the model, the transient temperature field under the condition of loss of lubrication is calculated based on the model and the steady-state temperature field is the initial condition under normal lubrication condition. The change rule of temperature over time of each node is analyzed. The method not only can calculate the equilibrium value (steady-state temperature field) of temperature field, but also can predict the time-varying process of temperature field (transient temperature field).
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：V275.1;TH132.41

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