scholarly journals Sludge Formation Analysis in Hydraulic Oil of Load Haul Dumper 811MK V Machine Running at Elevated Temperatures for Bioenergy Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
MohdAhteshamHussain Siddiqui ◽  
Sandeep K Pal ◽  
Nagesh Dewangan ◽  
Somnath Chattopadhyaya ◽  
Shubham Sharma ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Heat Dissipation ◽  
Elevated Temperatures ◽  
Oil Degradation ◽  
Regression Analyses ◽  
Sludge Formation ◽  
Base Oil ◽  
Hydraulic Oil ◽  
Temperature Shear ◽  
Test Result

Hydraulic oil degrades expediently during operating at elevated temperatures, and due to oil degradation, malfunction of all hydraulic components starts that hampers the hydraulic functioning of the machine. An inefficient component of the hydraulic system converts useful energy into heat. Overheating starts when the rate of heat energy escaping from the system overcomes the rate of heat dissipation. Viscosity, total acidic number (TAN), rheology, and FTIR analyses were carried out on the oil samples collected chronically, and the reasons for degradation and sludge formation were evaluated; the results showed that thermal cracking resistance capacity of the oil was low due to the imbalance percentage of additives in the base oil. Sludge impaired the system efficiency and prejudicially creates repercussions on power consumption. Sludge can be recycled for biofuel and to avoid imbalance in the ecosystem. The test result is plotted in a 3D view graph using the MATLAB R 2019 software for a better explanation. Variation in the behaviour of the hydraulic fluid with respect to time, temperature, shear stress, and shear rate was studied, and the result is validated with correlation and regression analyses.

scholarly journals A new process to develop a hydraulic system adapted to biodegradable hydraulic oil for construction machinery

2021 ◽  
Vol 12 (2) ◽  
pp. 56-74
Author(s):  
Satoshi OHKAWA ◽  
Sunkil YUN ◽  
Taketoshi HIBIYA ◽  
Hidekazu NISHIMURA
Keyword(s):  
Hydraulic System ◽  
Construction Machinery ◽  
Hydraulic Oil ◽  
New Process

Tribological Investigation of Copper (Cu) and Copper Oxide (CuO) Nanoparticles Based Nanolubricants for Machine Tool Slideways

2014 ◽  
Author(s):  
Saravanakumar Nesappan ◽  
Nallasamy Palanisamy ◽  
Mahesh Chandran
Keyword(s):  
Electron Microscope ◽  
Machine Tool ◽  
Copper Oxide ◽  
Elevated Temperatures ◽  
Stick Slip ◽  
Base Oil ◽  
Weight Composition ◽  
The Coefficient Of Friction ◽  
Oxide Particles ◽  
Mineral Lubricant

The present study intends to evaluate the tribological characteristics of Copper (Cu) and Copper oxide (CuO) based nanolubricant for its use in machine tool slideways. Different sizes of copper and copper oxide particles were chosen and physical characterisation were carried out using scanning electron microscope (SEM) and transmission electron microscope (TEM). The nanolubricants were prepared by adding various proportions (0.1%, 0.25%, 0.4% wt) of the particles in Polyalphaolefin (PAO) base oil with lecithin and oleic acid surfactants. Friction and stick-slip characteristics of the nanolubricants were assessed using pin-on-block reciprocating friction monitor simulating the actual loading conditions prevailing in machine tool slideways. Studies were also conducted under elevated temperatures to ascertain the performance of particles at higher temperatures. Extreme pressure properties of the lubricants were studied using Four Ball Tester. The results of the experiments were compared with ISO VG 32 oil, a conventional mineral lubricant meant for machine tool slideways and it was found that the tribological properties nanolubricants using both the nanoparticles were considerably better. The coefficient of friction found to be decreased by 2.5% and 17.5% for copper particles with 0.1% weight composition in ambient temperature and elevated temperature respectively. Whereas for copper oxide particles with 0.1% weight composition a reduction of 14.25% and 10% were obtained.

scholarly journals Synergistic Effects of Multiple Environmental Factors on Degradation of Hydrogenated Nitrile Rubber Seals

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 897 ◽  
Author(s):  
Weitao Lou ◽  
Weifang Zhang ◽  
Tingzhu Jin ◽  
Xuerong Liu ◽  
Wei Dai
Keyword(s):  
Environmental Factors ◽  
Elevated Temperatures ◽  
Synergistic Effects ◽  
Degradation Process ◽  
Nitrile Rubber ◽  
Oxidation Products ◽  
Compression Stress ◽  
Hydraulic Systems ◽  
Hydraulic Oil ◽  
Higher Temperature

Degradation tests of hydrogenated nitrile rubber seals, often used as sealing components in hydraulic systems, were conducted under the free and compression state in air and hydraulic oil at three elevated temperatures for several days to investigate the synergistic effects among three factors. The crosslinking and chain scission reactions both occurred simultaneously at higher temperature during the degradation process, and crosslinking predominated for most cases. Additionally, the synergistic effect between compression stress and hydraulic oil further slowed the degradation rate by limiting oxygen access. However, the higher temperature and hydraulic oil both promoted the formation of oxidation products, whereas the compression stress restrained the formation of amide groups. The fracture morphology results show that the defects gradually formed on the fracture surface, especially for the uncompressed specimens. The increase of the compression set aged in air was more than that in hydraulic oil, implying the more serious degradation. Moreover, rubber seals under the synthetic effect of three environmental factors presented the minimum degradation level. The degradation of the compressed and uncompressed specimens exposed to hydraulic oil is more serious than that of specimens exposed to air.

The Retrospects and Prospects of Pure Water Hydraulic Technology

2012 ◽  
Vol 201-202 ◽  
pp. 979-982 ◽  
Author(s):  
Feng Xu ◽  
Li Xiang Zhang
Keyword(s):  
Hydraulic System ◽  
Low Cost ◽  
Pure Water ◽  
Chemical Properties ◽  
Simple System ◽  
Hydraulic Oil ◽  
Physico Chemical ◽  
Water Hydraulic ◽  
Research Situation ◽  
The Ideal

Pure water hydraulic technology attracts more and more attention of people due to no pollution, low cost, simple system, and many other advantages. This paper compares physico-chemical properties between pure water and hydraulic oil, concludes that pure water is the ideal medium for hydraulic system. Then it discusses the development of pure water hydraulic technology, introduces the present research situation and development of pure water hydraulic components from home to abroad in the future.

Static and dynamic performance characteristics of powder lubricated symmetrical three-lobed bearing

2020 ◽  
pp. 135065012092632
Author(s):  
Jijo Jose ◽  
Niranjana Behera
Keyword(s):  
Carrying Capacity ◽  
Elevated Temperatures ◽  
Dynamic Performance ◽  
Operating Conditions ◽  
Load Carrying Capacity ◽  
Oil Degradation ◽  
Static And Dynamic Characteristics ◽  
Load Carrying ◽  
The Coefficient Of Friction ◽  
Ellipticity Ratio

Hydrodynamic oil bearings applied at elevated temperatures and extreme operating conditions are subjected to the problem of oil degradation. In order to overcome such conditions, dry powder lubricants are used as lubricants in the hydrodynamic journal bearings. Thus the problem of thermal degradation of oil at high temperatures can be eliminated. In this work, the static and dynamic characteristics of a symmetric three-lobed bearing lubricated with powdered particles have been predicted. Influence of the ellipticity ratio on the performance of the three-lobed bearing has also been investigated. It is observed that an increase in the ellipticity ratio increases the coefficient of friction and stability, but decreases the side leakage and the load carrying capacity of the three-lobed bearing. Also, it was observed that the large-sized powdered particles induce better load carrying capacity and better stability than the small-sized particles.

The development of hydraulic oils for the new fuel-efficient hydraulic hybrid vehicles with ANP method

2018 ◽  
Vol 70 (3) ◽  
pp. 474-480 ◽  
Author(s):  
Gongbin Tang ◽  
Yifan Chen ◽  
Feng Xiao ◽  
Shanshan Zhang ◽  
Fuchuan Huang
Keyword(s):  
Evaluation System ◽  
Chemical Properties ◽  
Analytic Hierarchy ◽  
Content Type ◽  
Base Oil ◽  
Hydraulic Oil ◽  
Technical Performance ◽  
Hydraulic Hybrid ◽  
New Energy ◽  
Oil Formulation

Purpose This paper aims to use this method to explore a new approach and possible technical optimal design for lubricant formulation. Design/methodology/approach The component of the developed oil was determined based on the physical and chemical properties of the base oil and the tribological properties. The analytic hierarchy process (ANP) method and SuperDecisions software were used for hydraulic oil modeling and calculation while taking performance index, work circumstance and economy into consideration. Findings The hydraulic oil formulation can be optimized using the ANP method, where the technical performance, economy and working circumstances of the hydraulic oils were taken into consideration in the evaluation system. The experiment analyzed and scored and screened the hydraulic oil formula in an objective and comprehensive manner. Originality/value The experiments showed that the newly developed hydraulic oils could meet the performance requirements for new energy vehicles equipped with hybrid hydraulic engines.

Research on Rapid Detection and Accounting of Small Particles in Marine Hydraulic Oil

2015 ◽  
Vol 645-646 ◽  
pp. 687-692
Author(s):  
Lin Zeng ◽  
Hong Peng Zhang ◽  
En Chen Liu ◽  
Hai Quan Chen ◽  
Fang Yu Cui
Keyword(s):  
Signal Amplification ◽  
Rapid Detection ◽  
Hydraulic System ◽  
Detection System ◽  
Iron Particles ◽  
Small Particles ◽  
Hydraulic Oil ◽  
Java Programming ◽  
Optical Detection System ◽  
Number Of Particles

Hydraulic system is widely used in the ship, when the diameter of tiny particles in hydraulic oil exceeds 20μm it indicates that the abnormal wear occurred and the malfunction may cause. This paper uses the light blockage method, the microfluidic detection chip for hydraulic oil detection has been designed and fabricated, a simple and effective optical detection system is developed with the signal amplification and data collection to achieve the detection of tiny particles, and finally through the JAVA programming to count the number of particles in which the diameter is more than 20μm. The results of rapid detections on iron particles with diameter between 25μm and 38μm show the good performance of the detection system and prove that the method is feasible.

scholarly journals Premium quality hydraulic oils

2021 ◽  
Author(s):  
Milan Kambič
Keyword(s):  
Crude Oil ◽  
American Petroleum Institute ◽  
Refining Process ◽  
Oil Refining ◽  
Base Oil ◽  
Hydraulic Oil ◽  
Base Oils

The base of the final product is the base oil. The final product is ready for use and is a mixture of base oil (or several base oils) and additives. Additives improve the properties of the base oil. Base oils can be mineral or synthetic based. Base oils or base stocks are created from separating and cleaning up crude oil. They are one of several liquid components that are created from crude oil. The crude oil refining process will be briefly described. The American Petroleum Institute implemented a system for describing various base oil types. The result was the development and introduction of base oils group numbers. The API numbers of various base oil groups and the main differences between them will be explained. At the end, premium quality hydraulic oil and its main characteristics will be presented.

scholarly journals High Temperature Magnetic Sensors for the Hot Section of Aeroengines

Aerospace ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 261
Author(s):  
Edward Rokicki ◽  
Radoslaw Przysowa ◽  
Jerzy Kotkowski ◽  
Paweł Majewski
Keyword(s):  
Gas Turbines ◽  
Heat Dissipation ◽  
Permanent Magnets ◽  
Elevated Temperatures ◽  
Health Management ◽  
Cooling System ◽  
Magnetic Measurements ◽  
Magnetic Sensors ◽  
Blade Vibration ◽  
Inductive Sensor

Magnetic sensors are widely used in aeroengines and their health management systems, but they are rarely installed in the engine hot section due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of blades operated at elevated temperatures (200–1000 °C) in high pressure compressors and turbines. The interaction of blades with the sensor was studied. A prototype of the sensor was made, and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100 °C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. Moreover, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring (BHM) of the last stages of compressors and gas turbines operating below 1000 °C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability. The presented technology extends the operating temperature of permanent magnets and is not specific for blade vibration but can be adapted to other magnetic measurements in the hot section of the aircraft engine.

The Application of Oil Monitoring Technology in the Marine Hydraulic System

2014 ◽  
Vol 628 ◽  
pp. 287-292 ◽  
Author(s):  
Bin Sun ◽  
Xin Cong Zhou
Keyword(s):  
Basic Principle ◽  
Hydraulic System ◽  
Oil Pollution ◽  
Monitoring Technology ◽  
Hydraulic Oil ◽  
Oil Monitoring

This paper discusses the source and harm of the hydraulic oil pollution, the connotation of oil monitoring technology, methods, instruments and basic principle of the oil monitoring, and states the feasibility and importance of oil monitoring technology from two failure cases in the hydraulic system of the ship.

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