Vegetable oils as hydraulic fluids for agricultural applications

Modern hydraulic oils have to fulfill a broad variety of parameters limitations to guarantee a proper system performance throughout a considerable lifetime. A comprehensive test of the liquids nowadays just can be performed by using long term hydraulic pump test set ups, including several different test stages. One of the most critical parameters in hydraulic pump testing is the pump wear indicating the anti-wear performance of the used oil. In this paper the authors focused on the development of a new testing procedure based on a simple standardized Brugger test aiming to achieve similar wear results as in a Parker Denison T6H20C pump test set up. The test conditions of a standard Brugger test are changed by taking a brass cylinder, reducing the normal load to 1 kg, increasing the test duration to 300 seconds, providing a well-defined surface roughness by using a 2,500 x grinding paper and perform 4 repetition tests to obtain a statistical more reliable measurement value. By using the new method it was possible to get a pre selection between pass and fail oils according to the wear properties without the necessity of performing an elaborated pump test. The preselection of hydraulic oils according to their anti-wear properties offers a huge cost saving potential for hydraulic oil developments.

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“…Furthermore it has to be done at a wide range of loads and speed. [9][10][11][12][13][14][15]. They all provide interesting results of e.g.…”

Section: State Of the Artmentioning

confidence: 86%

Simulation of Anti Wear Performance Using a Modified Brugger Test Set Up

Sequard-Base¹,

Grafl²,

Cihak-Bayr³

2018

Tribol. Ind.

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“…The glycol-free lubricant is biodegradable, and it can be an interesting alternative as a fire-resistant hydraulic oil (Figure 30). The protocols have been used in the EU Projects VOSOLUB [38], SUNOIL and BIOGREASE, [39], LUBRICOAT [40], CTVO-NET and LLINCWA [62], BIOMON and IBIOLAB [41], the national projects LUVE and BIOVESIN [63,64], and the industrial projects ADIVINA, PAVIA, and NANOINTECH.…”

Section: Tribology Of Biolubricants For Bearings and Gearsmentioning

confidence: 99%

“…The authors made special mention to those members of the tribology team, that completed their Doctoral Thesis for their contribution to the knowledge generated: Bihotz Pinedo (Tribology of seals 2016) [23][24][25]27], Borja Zabala (high Temperature Tribology (eg. moulds, engines) 2017) [20,22,42,43,46,52], Francesco Pagano, (tribology of ionic liquids and vacuum tribology, 2017) [2-4, 13, 57-65], Beatriz Fernandez-Diaz (tribology of polymers, 2017) [28,34,63], Virginia Saenz de Viteri (biotribology, 2016) [30,31,56,57], Sofia Alves (dental tribology, 2017) [58], Cristina Cerrillo (ecotoxicity of nanoparticles, 2016) [71][72][73][74][75], Ainara López (marine and off shore tribology, 2018) [12][13][14][15][16]. Also, to all the members of the tribology team that dedicate their professional work to tribology activity Elena Fuentes [17,18,30,40,56,57], Xana Fernandez [9, 11, 29, 31, 46-48, 54, 65], Gemma Mendoza [5,11,32,49,50,60,63,[71]…”

Section: Acknowledgementsmentioning

confidence: 99%

Tribology: The Tool to Design Materials for Energy-Efficient and Durable Products and Process

Igartua¹,

Bayón²,

Aranzabe³

et al. 2019

Friction, Lubrication and Wear

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This chapter describes a summary of the main tribological achievements carried out in TEKNIKER during the last 37 years. It covers the description of commercial and newly developed tribological test benches and case studies for a wide variety of applications. The examples refer to different tribological characterization tools for material selection (e.g., composition, surface treatments, lubricants). It makes emphasis in the failure mechanisms (pitting, scuffing, abrasion, adhesion, thermal fatigue, tribocorrosion, etc.) and friction simulation of a wide range of materials (seals, textiles, steels, cast iron, light alloys, ceramic, composites), tribological systems (mechanical components, biomaterials, tribolubrication), and environments (vacuum, ultrahigh vacuum, low or high temperature, and corrosive). A huge range of new testing equipment and protocols have been developed to simulate the mentioned failure mechanisms and working environments. This knowledge will make possible, in the future, to simulate at laboratory a still wider list of tribological systems and develop new standards. Tribology will help to implement materials solutions into energy and resource efficient products and process, to reduce carbon footprint.2 with more than 250 scientific contributions in congresses, journals, and books and 3 patents. It has been active in several international working groups and associations, in some of them, acting as Spanish representative:• The COST 516 about tribology (1995)(1996)(1997)(1998)(1999)(2000) • The COST 532 about tribotechnology of engines and transmissions

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“…In order to overcome the problems of existing hydraulic working fluids, various new hydraulic fluids have been developed to fulfill different application scenarios. Biodegradable vegetable hydraulic oil was first proposed to replace mineral hydraulic oil [10][11][12][13]. Ionic liquids and conductive solutions are also applied as unconventional hydraulic working fluids [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Liquid metal hydraulics paradigm: Transmission medium and actuation of bimodal signals

Gao

Qin

et al. 2021

Sci. China Technol. Sci.

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In this article, room temperature gallium-based fluids (RTGFs) with unique thermal and conductive properties are proposed as a transmission fluid for the force carrying medium of hydraulics, which rectify the lack of the multi-functional hydraulic roles of liquid metal (LM). The typical physical properties of RTGFs and comparative conventional hydraulic fluids (commercial hydraulic oil and deionized water), such as thermal stability and rheological characteristics are evaluated. Experimental and numerical methods, then, are adopted to clarify the force transmission performance of RTGFs and commercial hydraulic oils, as well as the influence of temperature fields on the viscosity of fluids. The results disclosed that the advantages of inherent flame resistance, wide liquid temperature range, and the viscosity changing slightly with temperature, make RTGFs potential to efficiently apply in the hydraulics as new working fluids. Finally, for illustration, the rigid and flexible actuators driven by RTGFs were designed as hydraulic fluid and demonstrated their capabilities in grasping objects with various shapes and weights, respectively. And the tunable stiffness of such a flexible actuator is enabled via the solid-liquid phase change of LM. Additionally, a frequency-adjustable antenna was manufactured and showcased owing to the introduced transformable electromagnetic behaviors of LM. Overall, the gallium-based LM fluids with thermoelectrical and mechanical multimodal signal medium, would serve as a potential candidate for future complex multifunctional signal transmission systems.

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Vegetable oils as hydraulic fluids for agricultural applications

Cited by 46 publications

References 2 publications

Simulation of Anti Wear Performance Using a Modified Brugger Test Set Up

Simulation of Anti Wear Performance Using a Modified Brugger Test Set Up

Tribology: The Tool to Design Materials for Energy-Efficient and Durable Products and Process

Liquid metal hydraulics paradigm: Transmission medium and actuation of bimodal signals

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