分子拓扑指数性质及在油膜压力测试中的应用

发布时间：2018-04-29 19:28

  本文选题：润滑油 + 正构烷烃　； 参考：《中北大学》2016年博士论文

【摘要】：在使用仪器设备的时候,都需要考虑环境温度的变化。低温能够影响润滑油的性能,通过润滑油油膜压力测试可以判断润滑油油膜形成的质量。如果润滑油膜形成不良,就会影响仪器设备的正常运转,甚至可能会损坏仪器设备。所以对于需要在低温环境中运行有运动部件的仪器设备,都要对其进行低温润滑实验。分子拓扑指数是定义在化合物分子结构图上的一种数值不变量,它与相应化合物的物化特性有着密切的联系。Balaban指数是分子拓扑指数中的一种,它可用于预测润滑油的熔点。本文的主要工作包括：(1)在基础理论方面,研究了两类分子拓扑指数：Balaban指数和Sum-Balaban指数,分别研究了具有仙人掌图分子结构模型和双圈图分子结构模型；研究了基于本原有向图模型的两类指数：scrambling旨数与m-competition旨数,解决了两类无记忆通信系统的最短时间问题。(2)在实际应用方面,通过Balaban中心指数和Balaban旨数,结合正构烷烃G4～G9的熔点,拟合了一个线性方程。使用该拟合方程预测了正构烷烃G4～G9润滑油的熔点。通过动压滑动轴承试验台,选用正构烷烃G4为润滑油,在荷重为1078.7N,转速为337转/分钟,温度为4-11℃的条件下进行滑动轴承油膜压力测试,检测油膜压力曲线变化规律。本文通过分子拓扑指数得到拟合方程,该方程可以准确预测化合物的熔点,实现了高精度的预测正构烷烃G4～G9润滑油熔点。通过拟合方程选择了合适的润滑油,同时设计滑动轴承油膜压力测试,检测润滑油油膜压力变化的规律。为低温环境下,润滑油的性能和选择提供了新的研究思路。
[Abstract]:In the use of instruments and equipment, you need to take into account the environmental temperature changes. Low temperature can affect the performance of lubricating oil, and the quality of oil film formation can be judged by oil film pressure test. If the lubricating oil film is not formed, it will affect the normal operation of the equipment, and may even damage the equipment. Therefore, it is necessary to carry out low-temperature lubrication experiments for the instruments and equipments which need to operate in low-temperature environment. The molecular topological index is a kind of numerical invariant defined on the molecular structure diagram of compounds. It is closely related to the physicochemical properties of the corresponding compounds. Balaban index is one of the molecular topological indices. It can be used to predict the melting point of lubricating oil. The main work of this paper includes: (1) in the basic theory, we study two kinds of molecular topological indices: Balaban index and Sum-Balaban exponent, and study the molecular structure model with cactus graph and the molecular structure model with bicyclic graph, respectively. In this paper, two kinds of exponents: scrambling number and m-competition order number based on the original direction graph model are studied. The shortest time problem of two kinds of memoryless communication systems is solved. In practical application, through Balaban center index and Balaban order number, the melting point of n-alkane G4~G9 is combined. A linear equation is fitted. The melting point of normal alkane G4~G9 lubricating oil was predicted by the fitting equation. The oil film pressure of sliding bearing was measured under the condition of load of 1078.7 N, rotational speed of 337 r / min, temperature of 4-11 鈩，

本文编号：1821254