scholarly journals Research on contribution analysis method of lubricating oil performance index

2021 ◽  
Vol 651 (2) ◽  
pp. 022031
Author(s):  
Yuanyuan Sun ◽  
Yuexing Wang ◽  
Pujian Wang ◽  
Zehui Cao
Author(s):  
B. C. Sharma ◽  
O. P. Gandhi

In this paper, a new approach for lubricating oil performance is assessed as an index by considering its pertinent properties and their interaction, modeled in terms of lubricating oil performance signed digraph (LOPSD). Its equivalent matrix is defined to obtain lubricating oil performance function. Numerical value of the function is called lubricating oil performance index (LOPI) and is a measure of lubricating oil performance and its residual life at a given time. This is obtained by substituting results of the identified oil tests.


2021 ◽  
Vol 12 (1) ◽  
pp. 27-37
Author(s):  
Siva Nabilla ◽  
Rizal Pahlevi

This study aims to determine the effect of the Islamicity Performance Index on the Profitabilityof Islamic Commercial Banks in Indonesia in 2014-2018. Research variables consist of Return OnAsset (ROA), Profit Sharing Ratio (PSR), Zakat Performance Ratio (ZPR), and Islamic Income Ratiovs Non-Islamic Income Ratio (IsIR). The population of this research is all Islamic commercial banksin Indonesia. This research uses the purposive sampling method. The sample used in this study were9 Islamic Commercial Banks that meet the required criteria. The analysis method used is multipleregression. The results of this study indicate that according to the T-test (partially) the results are thePSR variable has a positive effect, the ZPR variable has a positive effect and the IsIR variable hasno and insignificant effect on the Return On Asset (ROA) of Islamic Commercial Banks. So it can beconcluded from the three variables tested, the PSR variable and the ZPR variable are variables thathave a positive effect in this study. Meanwhile, according to the F test (simultaneously), the results arethe variable Profit Sharing Ratio (PSR), Zakat Performance Ratio (ZPR), and Islamic Income Ratio vsNon-Islamic Income Ratio (IsIR) have a joint effect on Return On Assets (ROA). ) Sharia CommercialBank.


2019 ◽  
Vol 31 (1) ◽  
pp. 141-152
Author(s):  
Alexandre C. Moreira ◽  
Wesley A. de Souza ◽  
Bruna R. P. Conrado ◽  
Helmo K. Morales-Paredes

Author(s):  
Mian Jiang ◽  
Shuangqi Liu ◽  
Yuhua Wang

Condition monitoring performance and diagnosis of rotor-bearing systems depend not only on the methods used, but also on the dynamic complexity of the system itself. Thus, it is important to analyze how changes in parameters under various working conditions impact on dynamic complexity. Most of previous research efforts on this topic have been focused on the analysis of nonlinear dynamics of rotor-bearing systems with different parameters. In this paper, a nonlinearity quantification based analysis method is presented to determine how parameter dynamics impact the complexity of rotor-bearing systems. The dynamic complexity of rotor system is estimated using defined nonlinearity measures. To validate this method, a sliding rotor-bearing system with a loose pedestal is used. The estimates (nonlinearity degrees) and the states of motion are matched with increasing rotational speeds. It is then investigated, how the eccentricities, lubricating oil viscosities, and bearing clearances impacted the dynamic complexity at several critical rotational speeds. These results can guide methodological choices for condition monitoring and diagnosis of rotor systems.


2011 ◽  
Vol 314-316 ◽  
pp. 1391-1395
Author(s):  
Xue Gong Liu ◽  
Zhan Guo Li ◽  
Zha La Wang

This paper is mainly about the experiment research of oil monitoring for a kind of special heavy vehicle’s transmission system. The wear elements in lubrication oil of a heavy vehicle’s transmission system were analyzed by the spectroscopic analysis method, and gear’s wear status was studied. Probability density function and probability distribution function of wear information about the elements in lubricating oil were calculated by the maximum entropy theory. The running cut-off point is obtained for diagnostic criteria of the vehicle’s failure, which provided evidence for monitoring and judging the reliability of the vehicle’s wear.


2011 ◽  
Author(s):  
Karl Janssens ◽  
Pieter Aarnoutse ◽  
Peter Gajdatsy ◽  
Laurent Britte ◽  
Filip Deblauwe ◽  
...  

Author(s):  

Показана перспективность комбинированной очистки моторного масла в судовых тронковых дизелях с использованием саморегенерирующихся фильтров и сепараторов. Этот метод очистки особенно эффективен для форсированных высокоавтоматизированных двигателей с низким угаром масла, работающих на высоковязких остаточных топливах. Обосновывается важность надежной защиты подшипников двигателя от абразивного изнашивания полнопоточным фильтрованием масла. Центробежный сепаратор, работающий по байпасной схеме, эффективно удаляет из системы смазки мелкодисперсную фазу нерастворимых загрязнений, что обеспечивает функционирование и повышает автономность саморегенерирующегося фильтра, а также замедляет старение смазочного масла. Доказывается необходимость подбора сепаратора по удельному индексу производительности, обеспечивающему ресурсосберегающее маслоиспользование в системе «дизель–топливо–масло– очистка». Новизна экспериментального моделирования эффективности этой системы состоит в оценке с помощью лабораторной моторной установки трибологических показателей отработавшего в судовом дизеле смазочного масла, отражающих взаимодействие звеньев рассматриваемой системы, и установлении их связи с изнашиванием двигателя. Эффективность системы идентифицирована по критерию изнашивания дизеля, что позволяет использовать ее расчетно-экспериментальную модель для определения параметров центробежного сепаратора – с тем, чтобы он удовлетворял требованиям рассматриваемых взаимодействующих звеньев. Модель трансформирована в выражение для расчета удельного, приходящегося на единицу мощности двигателя индекса производительности сепаратора, обеспечивающего минимальное изнашивание двигателя, бессменную работу смазочного масла и автономный срок службы саморегенерирующегося фильтра не менее 3 тыс. ч. Полученные рекомендации по подбору сепаратора в системе смазки двигателя с полной реализацией достоинств автоматизированной тонкой очистки моторного масла комбинированием фильтрования и центрифугирования применимы для судовых дизелей средней и повышенной частоты вращения мощностью до 20 тыс. кВт. Ключевые слова: ресурсосберегающее маслоиспользование, саморегенерирующийся фильтр, центробежный сепаратор, изнашивание дизеля, комбинированная очистка масла, смазочная система, индекс производительности сепаратора, оптимизация сепарирования масла The prospects of combined cleaning of engine oil in ship trunk diesel engines using self-regenerating filters and separators are shown. This cleaning method is especially effective for high-powered, highly automated engines with low oil waste, operating on high-viscosity residual fuels. The importance of reliable protection of engine bearings from abrasive wear by full-flow oil filtration is substantiated. The centrifugal separator, operating according to the bypass scheme, effectively removes the finely dispersed phase of insoluble contaminants from the lubrication system, which ensures the functioning and increases the autonomy of the self-regenerating filter, and also slows down the aging of the lubricating oil. The necessity of selecting a separator according to the specific performance index, which ensures resource-saving oil use in the “dieselfuel-oil-cleaning” system, is proved. The novelty of the experimental modeling of the efficiency of this system consists in evaluating the tribological indicators of the lubricating oil used in a marine diesel engine, reflecting the interaction of the links under consideration, on a laboratory motor unit, and establishing their connection with engine wear. The efficiency of the presented system is identified by the criterion of diesel wear, which makes it possible to use its computational and experimental model to determine the parameters of a centrifugal separator so that it meets the requirements of the considered interacting links. The model has been transformed into an expression for calculating the specific index of the separator performance per unit of engine power, which ensures minimum engine wear, permanent operation of the lubricating oil and an autonomous service life of a self-regenerating filter of at least 3 thousand hours. Full realization of the advantages of automated fine cleaning of engine oil by combining filtration and centrifugation, are applicable for marine diesel engines of medium and high speed with a capacity of up to 20 thousand kW. Keywords: resource-saving oil use, self-regenerating filter, centrifugal separator, diesel wear, combined oil purification, lubrication system, separator performance index, optimization of oil separation


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