本文選題：潤滑油 + 正構(gòu)烷烴��； 參考：《中北大學(xué)》2016年博士論文

【摘要】：在使用儀器設(shè)備的時候,都需要考慮環(huán)境溫度的變化。低溫能夠影響潤滑油的性能,通過潤滑油油膜壓力測試可以判斷潤滑油油膜形成的質(zhì)量。如果潤滑油膜形成不良,就會影響儀器設(shè)備的正常運(yùn)轉(zhuǎn),甚至可能會損壞儀器設(shè)備。所以對于需要在低溫環(huán)境中運(yùn)行有運(yùn)動部件的儀器設(shè)備,都要對其進(jìn)行低溫潤滑實驗。分子拓?fù)渲笖?shù)是定義在化合物分子結(jié)構(gòu)圖上的一種數(shù)值不變量,它與相應(yīng)化合物的物化特性有著密切的聯(lián)系。Balaban指數(shù)是分子拓?fù)渲笖?shù)中的一種,它可用于預(yù)測潤滑油的熔點。本文的主要工作包括：(1)在基礎(chǔ)理論方面,研究了兩類分子拓?fù)渲笖?shù)：Balaban指數(shù)和Sum-Balaban指數(shù),分別研究了具有仙人掌圖分子結(jié)構(gòu)模型和雙圈圖分子結(jié)構(gòu)模型；研究了基于本原有向圖模型的兩類指數(shù)：scrambling旨數(shù)與m-competition旨數(shù),解決了兩類無記憶通信系統(tǒng)的最短時間問題。(2)在實際應(yīng)用方面,通過Balaban中心指數(shù)和Balaban旨數(shù),結(jié)合正構(gòu)烷烴G4～G9的熔點,擬合了一個線性方程。使用該擬合方程預(yù)測了正構(gòu)烷烴G4～G9潤滑油的熔點。通過動壓滑動軸承試驗臺,選用正構(gòu)烷烴G4為潤滑油,在荷重為1078.7N,轉(zhuǎn)速為337轉(zhuǎn)/分鐘,溫度為4-11℃的條件下進(jìn)行滑動軸承油膜壓力測試,檢測油膜壓力曲線變化規(guī)律。本文通過分子拓?fù)渲笖?shù)得到擬合方程,該方程可以準(zhǔn)確預(yù)測化合物的熔點,實現(xiàn)了高精度的預(yù)測正構(gòu)烷烴G4～G9潤滑油熔點。通過擬合方程選擇了合適的潤滑油,同時設(shè)計滑動軸承油膜壓力測試,檢測潤滑油油膜壓力變化的規(guī)律。為低溫環(huán)境下,潤滑油的性能和選擇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，

本文編號：1821254