Application of recurrence dynamic analysis to running-in state recognition

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Minglong Peng ◽  
Yuankai Zhou ◽  
Xue Zuo
Keyword(s):  
Friction Coefficient ◽  
Design Methodology ◽  
Dynamic Features ◽  
Recurrence Plots ◽  
Recurrence Analysis ◽  
Content Type ◽  
State Recognition ◽  
Crankshaft Journal ◽  
Quantification Analysis ◽  
Homogeneous Pattern

Purpose The purpose of this paper is to study the dynamic features of friction coefficient during running-in state based on recurrence analysis, so as to recognize the running-in state of crankshaft journal bearings. Design/methodology/approach The friction coefficient was measured in the friction experiments and the dynamic features are analyzed by recurrence plots (RPs), unthreshold recurrence plots (URPs) and recurrence quantification analysis. Findings During the running-in process, RPs have gone through disrupted patterns, drift patterns and homogeneous patterns successively. URP shows that the phase trajectory spirals in the disrupted pattern gradually converge in the drift pattern and remain stable in the homogeneous pattern. Three independent measures, recurrence rate, entropy and laminarity, are chosen to characterize friction coefficient from the perspective of point, diagonal line and vertical line structures of the RPs. Originality/value The results provide a feasible way to monitor the running-in process and recognize the running-in state.

Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

2019 ◽  
Vol 71 (10) ◽  
pp. 1158-1165
Author(s):  
Mouhcine Mouda ◽  
Mohamed Nabhani ◽  
Mohamed El Khlifi
Keyword(s):  
Friction Coefficient ◽  
Design Methodology ◽  
Reynolds Equation ◽  
Load Capacity ◽  
Transverse Magnetic ◽  
Finite Width ◽  
Two Dimensional ◽  
Content Type ◽  
Slider Bearings ◽  
First Time

Purpose This study aims to examine the magneto-elastohydrodynamic effect on finite-width slider-bearings lubrication using a non-Newtonian lubricant. Design/methodology/approach Based on the magneto-hydrodynamic (MHD) theory and Stokes micro-continuum mechanics, the modified two-dimensional Reynolds equation including bearing deformation was derived. Findings It is found that the bearing deformation diminishes the load-capacity and increases the friction coefficient in comparison with the rigid case. However, the non-Newtonian effect increases load-capacity but decreases the friction coefficient. Moreover, the use of a transverse magnetic field increases both the friction coefficient and load capacity. Originality/value This study combines for the first time MHD and elastic deformation effects on finite-width slider-bearings using a non-Newtonian lubricant.

Friction and wear behavior of electroless nick coating used for spindle of cotton picker

2016 ◽  
Vol 68 (2) ◽  
pp. 220-226 ◽  
Author(s):  
Fanming Meng ◽  
Yuanpei Chen ◽  
Yang Yang ◽  
Zhiwei Chen
Keyword(s):  
Friction Coefficient ◽  
Coating Thickness ◽  
Test Specimen ◽  
Design Methodology ◽  
Friction And Wear ◽  
Applied Load ◽  
Wear Behavior ◽  
Transmission Efficiency ◽  
Content Type ◽  
Cotton Picker

Purpose – The severe friction and wear of the spindle in a cotton picker often occur in a picking cotton, which affects the spindle lifetime and its efficiency of picking cottons. This paper aims to investigate the effect of an electroless nick coating on the spindle performances to avoid its abnormal phenomena. Design/methodology/approach – First, it is coated on the surface of the test specimen with the material same as that of the spindle. Then, the friction coefficient and wear for the coating are measured under oil lubrication to evaluate its effect in improving the tribological performances for the spindle. Findings – The stabilized friction coefficient of the electroless nick coating decreases with increasing reciprocating frequency of specimen and increasing applied load. There exists a critical coating thickness yielding the smallest friction coefficient. Moreover, this coating has a property of the smaller friction coefficient in comparison with a hard chromium coating. Originality/value – The research about the electroless nick effect on the spindle’s tribological performances is not found yet to date. To avoid severe friction and wear of the spindle, this paper investigated how the reciprocating frequency of specimen, applied load and coating thickness affect the spindle’s tribological performances. The associated conclusions can provide a reference to enhance the spindle lifetime and its transmission efficiency.

Technique developed to study camshaft and tappet wear on real production engine

2017 ◽  
Vol 69 (2) ◽  
pp. 174-181 ◽  
Author(s):  
Waseem Arshad ◽  
Muhammad Adnan Hanif ◽  
Muhammad Usman Bhutta ◽  
Riaz Ahmad Mufti ◽  
Samiur Rahman Shah ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Design Methodology ◽  
Surface Coatings ◽  
Linear Variable Differential Transformer ◽  
Two Dimensional ◽  
Optical Surface ◽  
Content Type ◽  
Wear And Friction ◽  
Cam Follower ◽  
Engine Components

Purpose This paper aims to present a technique that has been developed to study the wear in the camshaft and tappet. The engine manufacturers use the most suitable materials, lubrication additives and surface coatings to minimize friction in all the components of the engine. Reduced friction results in less wear of critical engine components. The researchers are constantly trying to find an improved lubrication formula which reduces the wear and friction coefficient at a considerably low price. In this regard, the cam follower interface is of much importance because most of the wear occurs in this interface. Design/methodology/approach The tappets and the cam lobes are analyzed to determine wear. A two-dimensional optical surface profilometer is used to measure the tappet wear, and a high-resolution linear variable differential transformer is used for the measurement of cam lobes. Tests are conducted on Mercedes Benz engine OM 646 under constant camshaft speed, constant inlet lubricant temperature and constant lubricant pressure to study the oil rheology on cam tappet wear. Findings The results show that the wear occurs on the cam tappet interface, which is almost a linear phenomenon, and it increases with use. Originality/value Customized jigs were made to measure wear of camshaft and tappet.

Determination of optimum particle size of Al2O3/SiCp reinforced hybrid composites materials in wear testing

2015 ◽  
Vol 67 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Necat Altinkök ◽  
Ferit Ficici ◽  
Aslan Coban
Keyword(s):  
Weight Loss ◽  
Particle Size ◽  
Friction Coefficient ◽  
Design Methodology ◽  
Applied Load ◽  
Hybrid Composites ◽  
Minimum Weight ◽  
Mechanical Tests ◽  
Wear Testing ◽  
Content Type

Purpose – The purpose of this study is to optimize input parameters of particle size and applied load to determine minimum weight loss and friction coefficient for Al2O3/SiC particles-reinforced hybrid composites by using Taguchi’s design methodology. Design/methodology/approach – The experimental results demonstrate that the applied size is the major parameter influencing the weight loss for all samples, followed by particle size. The applied load, however, was found to have a negligible effect on the friction coefficient. Moreover, the optimal combination of the testing parameters was predicted. The predicted weight loss and friction coefficient for all the test samples were found to lie close to those of the experimentally observed ones. Findings – The optimum levels of the control factors to obtain better weight loss and friction coefficient were A8 (particle size, 60 μm) and B1 (applied load, 20 N), respectively. Taguchi’s orthogonal design was developed to predict the quality characteristics (weight loss and friction coefficient) within the selected range of process parameters (particle size and applied load). The results were validated through ANOVA. Originality/value – Firstly, hybrid MMCs ceramic powders were produced and then mechanical tests and optimization were performed.

How consumer involvement influences beer flavour preferences

2020 ◽  
Vol 32 (4) ◽  
pp. 537-554 ◽  
Author(s):  
Cristina Calvo-Porral ◽  
Sergio Rivaroli ◽  
Javier Orosa-Gonzalez
Keyword(s):  
Design Methodology ◽  
Principal Component ◽  
Consumer Involvement ◽  
Product Involvement ◽  
Content Type ◽  
Level Of Involvement ◽  
Beer Industry ◽  
Homogeneous Pattern ◽  
Hedonic Approach ◽  
Shed Light

Purpose Much of the innovation in the beer sector has focussed on flavour, resulting in a proliferation of flavoured beers. In this paper, the understanding of consumers’ flavour preferences is a relevant question for the beer industry; however, little is known whether consumer involvement influences beer flavour preferences, and the purpose of the present study is directed to shed light on this area yet under-investigated. Design/methodology/approach The research was conducted in Spain, where a total amount of 565 beer consumers were classified based on their level of involvement with beer. Data were analysed by analysis of variance, Tukey test, principal component analysis and multidimensional scaling (MDS) to examine consumers’ preferences for different beer flavours using a consumer hedonic approach based on like and dislike evaluation. Findings The findings support the existence of a homogeneous pattern in beer-flavour preferences, regardless of consumer involvement, showing a greater liking for conventional flavours. Further, highly involved consumers show a higher preference for unconventional or flamboyant beer flavours, than low or medium involved consumers. Originality/value Derived from the findings it can be stated that consumers do not accept all kinds of flavours and that their level of product involvement affects their flavour preferences.

Investigation on spatial distribution and evolution features of the running-in attractor based on a new approach

2018 ◽  
Vol 70 (9) ◽  
pp. 1636-1641
Author(s):  
Cong Ding ◽  
Hua Zhu ◽  
Guodong Sun ◽  
Chun Ling Wei ◽  
Yu Jiang
Keyword(s):  
Spatial Distribution ◽  
Friction Coefficient ◽  
Design Methodology ◽  
Three Dimensional ◽  
New Approach ◽  
Dynamic Behaviors ◽  
Content Type ◽  
Evolution Rule ◽  
Uniform State ◽  
Variation Tendency

Purpose The purpose of this work is to comprehensively reveal the spatial distribution and evolution features of a running-in attractor. Design/methodology/approach The friction coefficient signals extracted from wear experiments are reconstructed. A projected matrix is obtained based on the reconstructed matrix. Then the approach of three-dimensional (3D) histogram of phase points is proposed, which is used to intuitively characterize the complex properties of the running-in attractor. Findings The space occupied by the running-in attractor gradually contracts, then stabilizes and finally expands; the maximum of phase points number in a certain bin initially decreases, then keeps stable and finally increases rapidly; yet the percentage of bins number storing phase points shows an inverse variation tendency. Consequently, 3D histogram evolves from a nonuniform state to a uniform state then returns back to the nonuniform state, which indicates the evolution rule of “formation, stabilization and disappearance” of the running-in attractor. Originality/value Characterization on the features of the running-in attractor can provide valuable information about friction systems and their dynamic behaviors.

The tribological properties of bulk Fe2B with pre-oxidation treatment at 750°C in air

2019 ◽  
Vol 72 (1) ◽  
pp. 151-156
Author(s):  
Kemin Li ◽  
Zhifu Huang ◽  
Hanwen Ma ◽  
Shaofei Wang ◽  
Chaofeng Qin ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Oxide Layer ◽  
Tribological Properties ◽  
Wear Mechanisms ◽  
Design Methodology ◽  
Sample Surface ◽  
Oxidation Treatment ◽  
Soaking Time ◽  
Content Type

Purpose The purpose of this study was to investigate the tribological properties of bulk Fe2B with pre-oxidation treatment. Design/methodology/approach Bulk Fe2B was oxidized in an electric box furnace with a soaking time of 9 min under 750°C in air. Then, the tribological experiments were carried out on an UMT-Tribolab tester. Findings The oxide layer was composed of Fe, Fe2O3, Fe3O4, B2O3 and H3BO3. The oxidative direction of bulk Fe2B was perpendicular to the sample surface. But, the oxidative direction of Fe2B crystals was irregular. At 0.1 m/s, the friction coefficient was the lowest. The effects of shortening the running-in period of friction and reducing the friction coefficient by pre-oxidation treatment at 0.1 m/s were remarkable. Nevertheless, the effect of pre-oxidation treatment was futile at 0.2 m/s. Wear mechanisms of oxidized Fe2B mainly were adhesive and abrasive wear. Originality/value The effects of shortening the running-in period of friction and reducing the friction coefficient by pre-oxidation treatment were remarkable.

Study on the correlation between the running-in attractor and the wear particle group

2019 ◽  
Vol 72 (5) ◽  
pp. 681-686
Author(s):  
Cong Ding ◽  
Zhen-Yu Zhou ◽  
Zhi-Peng Yuan ◽  
Hua Zhu ◽  
Zhong-Yu Piao
Keyword(s):  
Correlation Dimension ◽  
Design Methodology ◽  
Wear Particle ◽  
Chord Length ◽  
Wear Particles ◽  
Dynamic Features ◽  
Dynamic Nature ◽  
Content Type ◽  
Wear Process ◽  
Particle Group

Purpose The purpose of this paper is to study the correlation between the dynamic features of the running-in attractor and the wear particle group, so as to characterize the running-in attractor by means of the wear particle group. Design/methodology/approach Wear particles are collected in phased wear experiments, and their dynamic features are investigated by the equivalent mean chord length L. Then, the correlation between the equivalent mean chord length L and the correlation dimension D of the running-in attractor is studied. Findings In the wear process, the equivalent means chord length L first decreases, then remains steady, and finally increases, this process agrees with the increase, stabilization and decrease of the correlation dimension D. Therefore, the wear particle group has a dynamic nature, which characterizes the formation, stabilization, and disappearance of a running-in attractor. Consequently, the dynamic characteristics and evolution of a running-in attractor can be revealed by the wear particle group. Originality/value The intrinsic relationship between the wear particle group and the running-in attractor is proved, and this is advantageous for further revealing the dynamic features of the running-in attractor and identifying the wear states.

Tribological behaviors of the water-lubricated rubber bearings under different lubricated conditions

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Xiao ◽  
Xiaolin Zheng ◽  
Yi Zhou ◽  
Dan Yao ◽  
Yang Wan
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Peer Review ◽  
Design Methodology ◽  
Tribological Behavior ◽  
Friction Test ◽  
Content Type ◽  
Rubber Bearing ◽  
Rubber Bearings ◽  
Worn Surface

Purpose This study aims to evaluate the tribological behavior of water-lubricated rubber bearings sliding against stainless steel under different lubricate conditions. Design/methodology/approach The water-lubricated rubber bearings under various normal loads and sliding speeds were carried out on the ring-block friction test, and the wear morphology is test conducted by using scanning electron microscope. Findings The results indicate that the surface of water-lubricated rubber bearings has a more alternative friction coefficient and wear rate under seawater than other lubricate conditions. The seawater not only acts as a lubricating medium but also brings microstructure while corroding the rubber interface, thereby further enhancing the lubricating effect and storing abrasive debris. Originality/value In this paper, tribological properties of the water-lubricated rubber bearing on ring-block friction test has been investigated. Water-lubricated rubber bearing was carried out on various lubricate conditions, and the friction coefficient, wear rate and worn surface were analyzed. Also, the effects of sliding speeds were investigated. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0204/

Using recurrence plots for stability analysis of ring-on-disc tribopairs

2019 ◽  
Vol 71 (4) ◽  
pp. 532-539
Author(s):  
Guodong Sun ◽  
Hua Zhu ◽  
Cong Ding
Keyword(s):  
Recurrence Plots ◽  
Friction Process ◽  
Content Type ◽  
Tribological Behaviors ◽  
Aisi 52100 ◽  
The Coefficient Of Friction ◽  
Aisi 1045 ◽  
Quantification Analysis ◽  
Evolution Laws ◽  
The Stability

Purpose AISI 52100-AISI 1045 specimens were used as the ring-on-disc tribopairs in the experiments to investigate the stability of friction process. Design/methodology/approach The coefficient of friction (COF) signals were measured throughout the friction process and the recurrence plots (RPs) and recurrence quantification analysis (RQA) are adapted to analyze the stability of the tribosystem. Findings The results show that the COF time-series acquired from different tests possess the same dynamic evolution laws. The evolution of RPs follows the rules of “disrupted-homogeneous-disrupted,” which corresponds to the “running-in, steady-state and increasing stages” of friction process. Additionally, the evolution laws of RQA measures LAM, Vmax and TT accord with the “bathtub curve.” Therefore, both RPs and RQA measures can inform quantitative interpretations of tribological behaviors and friction process identification. Originality/value The both RPs and RQA are capable of characterizing the tribological behaviors and can depict the various stages of friction process.

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