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    Tytuł:
    An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)
    Autorzy:
    Bednarek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2041293.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    CBR
    pavement structure
    subbase
    road base
    Opis:
    With the rapidly developing road transport, there is a demand for new roads to be constructed and for the existing ones to be repaired or extended. The base of any road is its foundation, usually made of crushed or uncrushed aggregate. To be used for road foundation purposes, a material needs to meet many requirements, as imposed by relevant standards. One of the basic tests to assess the suitability of an aggregate is to determine its California bearing ratio (CBR). This paper presents the results of CBR tests for mixed aggregate with the grading of 0–31.5 and 0–63 mm. Detailed assessments were carried out for penetration curves, which in many cases need to be adjusted to meet industry standards. The adjustment of plunger penetration curves in aggregate samples causes CBR to increase compared to the original curves.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 4; 323-336
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method for detection of rolling bearing faults based on the Local Curve Roughness approach
    Autorzy:
    Behzad, M.
    Bastami, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/258560.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rolling bearing
    diagnosis
    vibration
    local curve roughness
    Opis:
    Detection of rolling bearing faults by vibration analysis is an important part of condition monitoring programs. In this paper a new method for detection of bearing defects based on a new concept of local surface roughness, is proposed. When a defect in the bearing grows then roughness of the defective surface increases and measurement of the roughness can be a good indicator of the bearing defect. In this paper a method of indirectly measuring surface roughness by using vibration signal is introduced. Several attached examples including both numerically simulated signals and actual experimental data show the effectiveness of the new, easy-to-implement method.
    Źródło:
    Polish Maritime Research; 2011, 2; 44-50
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of cutting variables on bearing area curve parameters (BAC-P) during hard turning process
    Autorzy:
    Hamdi, A.
    Merghache, Sidi Mohammed
    Aliouane, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/139789.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hard turning
    hard steel
    ISO 13565 standard
    surface texture
    bearing area curve BAC
    Opis:
    Hard turning is a machining process that is widely used in the precision mechanical industry. The characterization of the functional surface texture by the ISO 13565 standard holds a key role in automotive mechanics. Until now, the impact of cutting conditions during hard turning operation on the bearing area curve parameters has not been studied (ISO 13565). The three parameters Rpk , Rk and Rvk illustrate the ability of the surface texture to resist friction. In this work, the main objective is to study the impact of cutting conditions (Vc, f and ap) of the hard turning on three parameters of the bearing area curve. The statistical study based on response surface methodology (RSM), analysis of variance (ANOVA) and quadratic regression were performed to model the three output parameters and optimize the input parameters. The experimental design used in this study is the Taguchi L25 orthogonal array. The results obtained show that the cutting speed has a greater effect on the bearing ratio curve (Rpk , Rk and Rvk ) parameters with a percentage contribution of 37.68%, 37.65% and 36.91%, respectively. The second significant parameter is the feed rate and the other parameter is significant only in relation to Rpk and Rk parameters.
    Źródło:
    Archive of Mechanical Engineering; 2020, LXVII, 1; 73-95
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Improved EMD Method Based on Utilizing Certain Inflection Points in the Construction of Envelope Curves
    Autorzy:
    Kafil, Mohsen
    Darabi, Kaveh
    Ziaei-Rad, Saeed
    Powiązania:
    https://bibliotekanauki.pl/articles/31339815.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    empirical mode decomposition
    EMD
    interpolation points
    envelope curve
    inflection points
    rolling element bearing fault diagnosis
    Opis:
    The empirical mode decomposition (EMD) algorithm is widely used as an adaptive time-frequency analysis method to decompose nonlinear and non-stationary signals into sets of intrinsic mode functions (IMFs). In the traditional EMD, the lower and upper envelopes should interpolate the minimum and maximum points of the signal, respectively. In this paper, an improved EMD method is proposed based on the new interpolation points, which are special inflection points (SIPn) of the signal. These points are identified in the signal and its first (n − 1) derivatives and are considered as auxiliary interpolation points in addition to the extrema. Therefore, the upper and lower envelopes should not only pass through the extrema but also these SIPn sets of points. By adding each set of SIPi (i = 1, 2, n) to the interpolation points, the frequency resolution of EMD is improved to a certain extent. The effectiveness of the proposed SIPn-EMD is validated by the decomposition of synthetic and experimental bearing vibration signals.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 389-401
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of rolling bearing life with damage curve approach
    Autorzy:
    Mehdigholi, H.
    Mirzaei Rafsanjani, H.
    Behzad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260574.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rolling bearing
    prognostic
    damage mechanics
    Damage curve approach
    Opis:
    The ability to determine the bearing life time is one of the main purposes in maintenance of rotating machineries. Because of reliability, cost and productivity, the bearing life time prognostic is important. In this paper, a stiffness-based prognostic model for bearing systems is discussed. According to presumed model of bearing and fundamental of damage mechanics, damage curve approach is used to relate stiffness of vibratory system and bearing running life. Furthermore, using the relation between acceleration amplitude at natural frequency and stiffness, final relation between acceleration amplitude at natural frequency and running life time according to damage curve approach can be established and the final running time is predicted. Experiments have been performed on self alignment bearing under failures on inner race and outer race to calibrate and to validate the proposed model. The comparison between model-calculated data and experimental results indicates that this model can be used effectively to predict the failure lifetime and the remaining life of a bearing system.
    Źródło:
    Polish Maritime Research; 2011, 3; 66-70
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybór funkcji aproksymującej parametry modelu- krzywej obciążenie osiadanie dla pali prefabrykowanych na podstawie testów statycznych
    Choosing approximation function for the model of settlement load curve, in static load test for precast concrete piles
    Autorzy:
    Meyer, Z.
    Szmechel, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/390673.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    nośność pala
    osiadanie pala
    testy statyczne obciążenia
    interpretacja
    pile capacity
    static load test interpretation
    bearing capacity
    Opis:
    W pracy przedstawiono analizę prezentowanej w 2012 roku metody interpretacji wyników testów statycznych pali [8,9] wykorzystując równanie zaproponowane przez Meyera i Kowalowa [7]. Wykonano eksperymenty numeryczne na palu teoretycznym, porównano wyniki badań z wartościami oczekiwanymi, i dokonano wyboru funkcji opisującej jeden ze współczynników równania podstawowego, jako lepiej opisującej proponowaną metodę.
    The main aim of the work is to define better correlation between parameters of Meyer- Kowalów equation [7,8] with the use of mathematical experiments and statistical tests. So far the research has shown that correlation between particular factors are different than common assumed. It was necessary to check non linear correlations between C-constant and K. A certain constant and starting data were assumed in the theoretical model applied to the paper. As a result of the mathematical experiments, the best fit proposal of estimation C and equation representing=(Ngr)was formulated.
    Źródło:
    Budownictwo i Architektura; 2013, 12, 3; 105-112
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of plasma cutting parameters upon shapes of bearing curve of C45 steel surface
    Autorzy:
    Skoczylas, A.
    Zaleski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/102911.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    plasma cutting
    bearing curve
    surface
    roughness
    Opis:
    The article presents the results of studies on the effect of plasma cutting technological parameters upon the shape of bearing curves and the parameters of the curve. The topography of surface formed by plasma cutting were analyzed. For measuring surface roughness and determining the bearing curve the appliance T8000 RC120 – 400 by Hommel-Etamic was used together with software.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 27; 78-82
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of surface topography and bearing properties of hard turned surfaces using differently shaped PCBN tools
    Analiza topografii i nośności powierzchni po obróbce na twardo przy użyciu narzędzi z PCBN
    Autorzy:
    Smardziova, M.
    Żak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175984.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hard turning
    wiper geometry
    bearing area curve
    surface topography
    obróbka na twardo
    geometria wiper
    krzywa udziału nośnego
    chropowatość powierzchni
    Opis:
    This paper deals with hard turning using conventional and wiper polycrystalline cubic boron nitride (PCBN) tools. 3D surface topographies and bearing area curves were determined and compared after hard turning with differently shaped cutting tools. Machined parts were made of a 100Cr6 (AISI 5210) hardened bearing steel with Rockwell hardness HRC=60 ± 1 HRC.
    W pracy przedstawiono analizę wyników badań procesu obróbki twardych materiałów po toczeniu ostrzami skrawającymi o geometrii konwencjonalnej i wiper wykonanych z PCBN. Określono krzywe udziału materiałowego powierzchni oraz topografię powierzchni po obróbce na twardo stali łożyskowej 100Cr6 (AISI 5210) wg DIN 17230 o twardości HRC 60±1.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 3; 45-53
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A peculiarity of determining a static carrying capacity for the one-row ball slewing bearing loaded the large radial force
    Autorzy:
    Śpiewak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/246680.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    slewing bearing
    one row ball slewing bearing
    radial force
    axial force
    tilting moment
    curve of the static carrying capacity
    numerical modelling
    Opis:
    Slewing bearings are applied commonly in the following devices inter alia: harbour cranes, traveling cranes, radar stations, machinery underground and an opencast mining, armaments industry, building machines, medical analysis devices, rotary kilns, manufacturing systems, a power engineering. A static limiting load curve of the slewing bearings describes ranges of the allowable loads, which the bearing can be safely carried for assumption by a manufacturer durability. The static carrying capacity of a slewing bearing describe the relationship between a tilting moment M and an axial force Fa for assumed a value of a radial force Fr. The article concerns problems related to catalo selection of rolling bearings which are loaded the large radial forces which may by differently directed in relation to a tilting moment's vector. Manufactures of the slewing bearings mostly does not present in product catalogs of a static limiting load curve, which have taken into account an action the radial forces. According to an INA company, the radial forces are reduced to determining an equivalent tilting moment and an equivalent axial force. In this work, the static limiting load curves have been determined based on the FEM models, the equations of contact mechanics for the ball and the bearing raceway. The models were performed by use the ADINA system. Juxtaposition of results obtained on a basis of method's INA company and own model have been presented in form the static limiting load curves. The object of the analysis was the one row ball slewing bearing, domestic production, which is used in excavator type F250H.
    Źródło:
    Journal of KONES; 2016, 23, 3; 533-540
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of vibration shot peening parameters upon shapes of bearing curves of alloy steel surface
    Autorzy:
    Zaleski, K.
    Skoczylas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/102198.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    vibration shot peening
    bearing curve
    surface roughness
    Opis:
    The article presents the results of studies on the effect of technological parameters of vibration shot peening upon the shape of bearing curves and the parameters of that curve. The topography of surface formed in result of vibration shot peening and pre-machining, which was grinding, were analyzed. The material used in the studies was alloy steel 30HGSA. The shot peening process was performed on an appliance equipped with a kinematic vibrator. Shot peening time t, vibrator oscillations (vibrations) frequency ν, as well as vibrator oscillations amplitude A were changed within: t = 1–15 min, ν = 17,5–35 Hz, A = 10,3–17,3 mm. For measuring surface roughness and determining the bearing curve the appliance T8000 RC120-400 by Hommel- Etamic was used together with the software. In result of the machining performed surface roughness decreased, and the parameters of bearing curve improved.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 25; 20-26
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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