Asymmetric morphological filter for roughness evaluation of multifunctional surfaces

ISA Transactions, Год журнала: 2023, Номер 146, С. 403 - 420

Опубликована: Дек. 13, 2023

Язык: Английский

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Resolving Selected Problems in Surface Topography Analysis by Application of the Autocorrelation Function

Coatings, Год журнала: 2022, Номер 13(1), С. 74 - 74

Опубликована: Дек. 31, 2022

In this paper, the validity of application an autocorrelation function for resolving some surface topography measurement problems was presented. Various types surfaces were considered: plateau-honed, honed with burnished dimples, ground, turned, milled, laser-textured, or isotropic. They measured stylus and non-contact (optical) methods. Extraction selected features, such as form waviness (defined L-surface) high-frequency noise (S-surface) from raw data, supported function. It proposed to select analysis procedures both profile (2D) areal (3D) analysis. Moreover, applications various regular (available in commercial software) methods, least-square-fitted polynomial planes, Gaussian (regression robust) functions, median filter, spline approach, fast Fourier transform scheme, evaluation parameters ISO 25178 standards.

Язык: Английский

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Effect of Countersample Coatings on the Friction Behaviour of DC01 Steel Sheets in Bending-under-Tension Friction Tests

Materials, Год журнала: 2024, Номер 17(15), С. 3631 - 3631

Опубликована: Июль 23, 2024

The aim of this article is to provide an analysis the influence type hard anti-wear coatings on friction behaviour DC01 deep-drawing steel sheets. sheets exhibit high formability, and they are widely used in sheet metal forming operations. tribological properties tool surface, especially coating used, determine conditions forming. In order carry out research, study developed manufactured a special bending-under-tension (BUT) tribometer that models phenomenon rounded edges tools process. rationale for building tribotester was there no commercial tribotesters available can be model processes. deformation coefficient (CoF) change topography surface were analysed. Countersamples with surfaces prepared using titanium + nitrogen ion implantation, implantation electron beam remelting tested. tests carried dry lubrication oils different kinematic viscosities. Under conditions, clear increase CoF value, elongation samples all analysed types countersamples, observed. lubricated uncoated countersample showed most favourable conditions. Furthermore, oil lower viscosity provided more reducing friction. Within entire range sample elongation, by S100+ oil. During process, average roughness decreased as result flattening phenomenon. value Sa parameter during BUT test 20.3-30.2%, depending countersample. As kurtosis skewness increased decreased, respectively, compared as-received metal.

Язык: Английский

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Fractal Analysis on Machined Surface Morphologies of Soft-Brittle KDP Crystals Processed by Micro Ball-End Milling

Materials, Год журнала: 2023, Номер 16(5), С. 1782 - 1782

Опубликована: Фев. 21, 2023

The micro-defects on KH2PO4 (KDP) optic surfaces are mainly repaired by the micro-milling technique, while it is very easy to introduce brittle cracks surfaces, as KDP soft and brittle. To estimate machined surface morphologies, conventional method roughness, but fails distinguish ductile-regime machining from brittle-regime directly. achieve this objective, of great significance explore new evaluation methods further characterize morphologies. In study, fractal dimension (FD) was introduced morphologies soft-brittle crystals micro bell-end milling. 3D 2D dimensions their typical cross-sectional contours have been calculated, respectively, based Box-counting methods, were discussed comprehensively combining analysis quality textures. FD identified a negative correlation with roughness (Sa Sq), meaning worse smaller FD. circumferential could quantitively anisotropy micro-milled which not be analyzed roughness. Normally, there obvious symmetry ball-end milled generated machining. However, once distributed asymmetrically becomes weaker, assessed would occupied fractures, corresponding processes will in regime. This facilitate accurate efficient optics micro-milling.

Язык: Английский

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Roughness Evaluation of Burnished Topography with a Precise Definition of the S-L Surface

Applied Sciences, Год журнала: 2022, Номер 12(24), С. 12788 - 12788

Опубликована: Дек. 13, 2022

Studies of surface topography including processes measurement and data analysis have an influence on the description machined parts with their tribological performance. Usually, roughness is analysed when a scale-limited (S-L) surface, excluding short (S-) length (L-) components from raw measured data, defined. Errors in precise definition S-L can cause false estimation detail properties, especially its arise contains some burnished details such as oil pockets, dimples, scratches, or, generally, deep or wide features. The validation proposed methods for also affect accuracy ISO 25178 parameter calculation. It was found that application commonly used procedures, available commercial software (e.g., least-square fitted cylinder element polynomial planes, regular robust Gaussian regression, spline, median fast Fourier transform filters) be suitable definition. However, additional analyses, based power spectral densities, autocorrelation function, texture direction graphs, characterisation, are strongly required. effect values parameters comprehensively studied. Some proposals guidance how to define appropriate with, respectively, objective evaluation parameters, were presented.

Язык: Английский

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Study of the Plastic Behavior of Rough Bearing Surfaces Using a Half-Space Contact Model and the Fatigue Life Estimation According to the Fatemi–Socie Model

Lubricants, Год журнала: 2023, Номер 11(3), С. 133 - 133

Опубликована: Март 13, 2023

A multiscale approach for the fatigue life estimation of rolling bearings is presented in this paper and applied to inner rings cylindrical roller type NU208. The forces acting contact are determined from system-oriented modeling at macro level. microscale simulations carried out a half-space model. stresses on ring used local approach, according Fatemi–Socie, estimation. Four surface variants were investigated, one ideally smooth three real (rough) surfaces. rough different finishing processes: fine ground, hard turned, ground produced. load case with maximum pressure 2.4 GPa roller-inner was investigated. In addition estimation, plasticity behavior (surface topography, resulting pressure, residual stress) manufactured surfaces stood focus work. As comparison between experimental simulated results confirms, good predictions can be made simulation

Язык: Английский

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Feature-Based Characterisation of Turned Surface Topography with Suppression of High-Frequency Measurement Errors

Sensors, Год журнала: 2022, Номер 22(24), С. 9622 - 9622

Опубликована: Дек. 8, 2022

Errors that occur when surface topography is measured and analysed can be classified depending on the type of studied. Many types topographies are considered frequency-based errors However, turned not comprehensively studied data processing caused by false estimation (definition suppression) selected features (form or noise) analysed. In present work, effects application various methods (regular Gaussian regression, robust spline fast Fourier Transform filters) for suppression high-frequency measurement noise from raw presented compared. The influence usage commonly used available commercial software, e.g., autocorrelation function, power spectral density, texture direction, which function values areal parameters (ISO 25178) standards, also introduced. Analysed surfaces were with a stylus via non-contact (optical-white light interferometry) methods. It was found characterisation topography, based analysis features, crucial in reducing filters applied. Moreover, common functions advantageous feature-based studies proposed both profile processing.

Язык: Английский

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Impact of Using Tungsten, Cobalt, and Aluminum Additives on the Tribological and Mechanical Properties of Iron Composites

Crystals, Год журнала: 2023, Номер 13(3), С. 395 - 395

Опубликована: Фев. 24, 2023

The effect of tungsten, aluminum, and cobalt on the mechanical properties iron-based composites prepared by powder technology was studied. Five samples with different contents were established. five have following chemical compositions: (I) full iron sample, (II) 5wt.% (III) tungsten-4wt.% cobalt-1wt.% (IV) tungsten-2.5wt.% cobalt-2.5wt.% (V) tungsten-1wt.% cobalt-4wt.% aluminum. mixed composite powders milling, in which 10:1 ball to ratio 350 rpm for 20 h cold compacted a diaxial press under 80 bars, then sintered at temperatures ranging from 1050 °C 1250 an argon furnace. characterized mechanically physically using XRD, SEM, density measuring device, hardness compression test tribological device wear friction tests. XRD results refer formation intermetallic compounds such as Fe7W6, Al5Co2, Fe2W2Co Co7W6 main peaks Fe. good combination recorded sample number five, contained 5% W, 4% Al, 1% Co Fe base, where it obtained highest resistance, largest hardness, acceptable compressive strength, lowest coefficient due hard anti-friction action compared other samples. This is candidate applications require high resistance moderate accompanied toughness, like bearing materials both static dynamic loading superior properties.

Язык: Английский

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Gearbox Fault Identification Model Using an Adaptive Noise Canceling Technique, Heterogeneous Feature Extraction, and Distance Ratio Principal Component Analysis

Sensors, Год журнала: 2022, Номер 22(11), С. 4091 - 4091

Опубликована: Май 27, 2022

Using an adaptive noise canceling technique (ANCT) and distance ratio principal component analysis (DRPCA), this paper proposes a new fault diagnostic model for multi-degree tooth-cut failures (MTCF) in gearbox operating at inconsistent speeds. To account background disturbance the vibration characteristics of gear failures, proposed approach employs ANCT first stage to optimize signals. The applies denoising each basic frequency segment whole response vibrations. Following that, novel DRPCA is used extract discriminating low-dimensional features. initially determines feature's relative proximity categories by computing average Euclidian between similar dissimilar classes. most discriminatory features with lowest dimensions are selected, as determined (PCA). created combining ratio-based feature inspection PCA. optimal set containing discriminative then fed support vector machine classifier identify multiple failure categories. experimental results indicate that outperforms state-of-art approaches offers highest identification accuracy.

Язык: Английский

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An efficient algorithm for areal morphological filter

Izmeritel`naya Tekhnika, Год журнала: 2024, Номер 12, С. 12 - 17

Опубликована: Янв. 30, 2024

This article discusses morphological filtering for assessing a areal parameters of texture engineering products. A data organization structure has been proposed that makes it possible to increase the efficiency an iterative algorithm enumerating surface coordinates. Morphological filters complement standard Gaussian filter evaluate functional properties surface. The widespread use in metrological practice is currently hampered by lack effective algorithm. An based on matrix representation operations coordinates presented. For this purpose, different indexing points primary and structuring element introduced. sphere or flat segment used as element. high performance developed ensured due fact all calculations are carried out one pass, without nested loops, some other algorithms. Algorithms dilation erosion presented, basis which closing opening constructed. Simulations various sets comparison with known algorithms confirmed designed results obtained can be analyze product surfaces.

Язык: Английский

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