Bench Testing of Sensors Utilized for In-Line Monitoring of Lubricants and Hydraulic Fluids Properties

This work reports the results of a study on the behaviour of five sensors recently developed for oil conditions monitoring, installed in-line in an experimental test rig for lubricants. The tests were carried out on seven oils of different origins (one synthetic ester, two bio-based synthetic esters, four vegetable oils) and use (two UTTOs and five hydraulic oils), under controlled working conditions, according to a specially designed test method. At first, the study concerned the identification of the conditions for the correct sensors’ installation. Then, the tests started applying to the fluids severe work cycles intended to accelerate oil ageing. The data of viscosity, permittivity, relative humidity, electric conductivity, particle contamination, and ferro-magnetic particles provided by the sensors were compared to the results of laboratory analyses made on oil samples taken during the tests with the aim of verifying the sensors measurements accuracy and reliability and selecting the more suitable ones to in-line oil conditions monitoring, in the perspective of introducing them also in field applications, e.g., on agricultural tractors, for preventing damages due to oil deterioration, and in managing the machine maintenance.

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Test Rig and Method for Comparative Evaluation of Conventional and Bio-Based Hydraulic Fluids and Lubricants for Agricultural Transmissions

Sustainability ◽

10.3390/su12208564 ◽

2020 ◽

Vol 12 (20) ◽

pp. 8564 ◽

Cited By ~ 1

Author(s):

Daniele Pochi ◽

Roberto Fanigliulo ◽

Carlo Bisaglia ◽

Maurizio Cutini ◽

Renato Grilli ◽

...

Keyword(s):

Evaluation Process ◽

Test Method ◽

Test Rig ◽

Negative Effects ◽

Transmission Oil ◽

Hydraulic Fluids ◽

Agricultural Tractors ◽

Short Time ◽

Related Test ◽

Fluid Test

The use of lubricants and hydraulic fluids of both mineral and synthetic origin in agricultural processes could have a deep impact on the environment as a result of their possible dispersion in the ground and aquifers. Replacing them with bio-based fluids, developed to provide good tribological properties and high biodegradability, could contribute to reducing their negative effects. The evaluation of the capacity of such innovative fluids to replace the conventional ones is based on work cycles lasting as long as their lifetime, during which their characteristics must prove to be at least equal to those of the fluids they replace. To shorten the evaluation process, CREA (Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia Agraria) developed a fluid test rig (FTR) and related test method, able to apply severe work cycles on small oil volumes, thereby accelerating the aging of the fluid beyond what typically occurs. This paper reports the results of the tests on FTR’s functionality carried out comparing two UTTO (Universal Tractor Transmission Oil) fluids: a widespread conventional fluid and an experimental vegetable-based oil. The FTR will permit, in a relatively short time, the assessment of the most promising formulations to be tested later under real working conditions, e.g., in agricultural tractors, reducing the risk of damage, before their ultimate introduction into the operating reality.

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Method for bench testing engines for agricultural tractors and machines for net power

10.3403/00134443 ◽

1984 ◽

Keyword(s):

Agricultural Tractors ◽

Bench Testing

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Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer

10.1520/d2983-21 ◽

2021 ◽

Author(s):

Keyword(s):

Low Temperature ◽

Automatic Transmission ◽

Test Method ◽

Rotational Viscometer ◽

Hydraulic Fluids

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Test Method for Evaluating Wear Characteristics of Tractor Hydraulic Fluids

10.1520/d4998-13r21 ◽

2021 ◽

Author(s):

Keyword(s):

Test Method ◽

Wear Characteristics ◽

Hydraulic Fluids

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Application of Multidimensional Statistical Analysis in Tribotechnical Diagnostics of Hydraulic Fluids in Woodworking Equipment

Materials ◽

10.3390/ma14164628 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4628

Author(s):

Michaela Hnilicová ◽

Ján Turis ◽

Richard Hnilica

Keyword(s):

Data Matrix ◽

Multivariate Statistical Methods ◽

Multivariate Statistical ◽

Machine Maintenance ◽

Hydraulic Fluids ◽

Quantitative Characteristics ◽

Friction Surfaces ◽

Qualitative And Quantitative Characteristics

The article dealt with the assessment of the quality of hydraulic oil and determination of the mode of wear of the friction surfaces of Baljer & Zembrod manipulating lines through the information traces in the oils by applying tribotechnical diagnostics. We presented the assessment of the level of degradation of the oils. In addition, we presented the mode of wear of the friction surfaces washed in oil through evaluation of the qualitative and quantitative characteristics of the particles found in the oil. In detail, we focused on the application of suitable multivariate statistical methods on the data matrix. The article also presents predictive models that can sort oils into groups based on the assessment of quality of the oil and the state of the friction couples. The models can be used in research and in solving practical tasks in tribotechnical diagnostics of hydraulic fluids in woodworking equipment. Our results showed that the manipulation lines were greatly thermically stressed due to inadequate oil and machine maintenance. By correlative integration of all methods used, we could determine the real mode of the wear of the tribologic nodes of the machine. The experiment enabled the early detection of an undesirable process in the tribological node and implementation of corrective measures before the machine would break down.

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