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Tytuł:
Roughness Prediction Based on a Model of Cochlear Hydrodynamics
Autorzy:
Vencovskỳ, V.
Tematy:
roughness
prediction of roughness
auditory models
peripheral ear
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/176524.pdf  Link otwiera się w nowym oknie
Opis:
The term roughness is used to describe a specific sound sensation which may occur when listening to stimuli with more than one spectral component within the same critical band. It is believed that the spectral components interact inside the cochlea, which leads to fluctuations in the neural signal and, in turn, to a sensation of roughness. This study presents a roughness model composed of two successive stages: peripheral and central. The peripheral stage models the function of the peripheral ear. The central stage predicts roughness from the temporal envelope of the signal processed by the peripheral stage. The roughness model was shown to account for the perceived roughness of various types of acoustic stimuli, including the stimuli with temporal envelopes that are not sinusoidal. It thus accounted for effects of the phase and the shape of the temporal envelope on roughness. The model performance was poor for unmodulated bandpass noise stimuli.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between profile and areal surface roughness parameters
Autorzy:
He, Baofeng
Ding, Siyuan
Shi, Zhaoyao
Tematy:
profile surface roughness
areal surface roughness
filtration techniques
evaluation parameters
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/1849053.pdf  Link otwiera się w nowym oknie
Opis:
Surface roughness has an important influence on the service performance and life of parts. Areal surface roughness has the advantage of accurately and comprehensively characterizing surface microtopography. Understanding the relationship and distinction between profile and areal surface roughness is conducive to deepening the study of areal surface roughness and improving its application. In this paper, the concepts, development, and applications of surface roughness in the profile and the areal are summarized from the aspect of evaluation parameters. The relationships and differences between surface roughness in the profile and the areal are analyzed for each aspect, and future development trends are identified.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between profile and areal surface roughness parameters
Autorzy:
He, Baofeng
Ding, Siyuan
Shi, Zhaoyao
Tematy:
profile surface roughness
areal surface roughness
filtration techniques
evaluation parameters
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/1849106.pdf  Link otwiera się w nowym oknie
Opis:
Surface roughness has an important influence on the service performance and life of parts. Areal surface roughness has the advantage of accurately and comprehensively characterizing surface microtopography. Understanding the relationship and distinction between profile and areal surface roughness is conducive to deepening the study of areal surface roughness and improving its application. In this paper, the concepts, development, and applications of surface roughness in the profile and the areal are summarized from the aspect of evaluation parameters. The relationships and differences between surface roughness in the profile and the areal are analyzed for each aspect, and future development trends are identified.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of a micro-smoothing process with the use of machined surface images
Autorzy:
Zawada-Tomkiewicz, A.
Ściegienka, R.
Tematy:
belt grinding process
surface roughness & micro-roughness
surface image
wavelet decomposition
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/221775.pdf  Link otwiera się w nowym oknie
Opis:
Industrial applications require functional surfaces with a strictly defined micro-texture. Therefore engineered surfaces need to undergo a wide range of finishing processes. One of them is the belt grinding process, which changes the surface topography on a range of roughness and micro-roughness scales. The article describes the use of machined surface images in the monitoring process of micro-smoothing. Machined surface images were applied in the estimation of machined surface quality. The images were decomposed using two-dimensional Discrete Wavelet Transform. The approximation component was analyzed and described by the features representing the geometric parameters of image objects. Determined values of image features were used to create the model of the process and estimation of appropriate time of micro-smoothing.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between profile and areal surface roughness parameters
Autorzy:
He, Baofeng
Ding, Siyuan
Shi, Zhaoyao
Tematy:
profile surface roughness
areal surface roughness
filtration techniques
evaluation parameters
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/1849009.pdf  Link otwiera się w nowym oknie
Opis:
Surface roughness has an important influence on the service performance and life of parts. Areal surface roughness has the advantage of accurately and comprehensively characterizing surface microtopography. Understanding the relationship and distinction between profile and areal surface roughness is conducive to deepening the study of areal surface roughness and improving its application. In this paper, the concepts, development, and applications of surface roughness in the profile and the areal are summarized from the aspect of evaluation parameters. The relationships and differences between surface roughness in the profile and the areal are analyzed for each aspect, and future development trends are identified.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the behaviour of a contact layer between the workpiece and a locator
Autorzy:
Maciolka, P.
Jedrzejewski, J.
Tematy:
roughness
contact
model
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Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:
https://bibliotekanauki.pl/articles/1429343.pdf  Link otwiera się w nowym oknie
Opis:
The assurance of high precision alignment of workpieces with low stiffness requires thorough knowledge about the phenomena taking place in the contact area under the influence of forces exerted by actuators. It is indispensable to utilise the model of a contact and deformations taking place in it. In order to solve the problem of contact, the contact geometry was modelled by means of a flat and rough surface model based on stereometric measurements, as well as by means of the finite element method (FEM). In a FEM method, a spherical structure of the surface layer was assumed and only one zone was taken into consideration, i.e. 0.4.Rt (maximum surface roughness). Zone structure allows easy changing of mechanical properties of material during the introduction of data defined by a strengthening curve in the plastic region. The possibility of expanding the model by consecutive zones allows taking into consideration the physical properties in complex analyses of the surface layer. This paper presents the problem of contact related to the alignment and fixing process, a model of contact deformations between a flat and a rough surface, as well as the algorithm for determining the model of a surface profile according to the bearing ratio curve.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of roughness coefficient of the underside of ice cover
Autorzy:
Majewski, W.
Tematy:
ice cover
roughness coefficient
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Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:
https://bibliotekanauki.pl/articles/241490.pdf  Link otwiera się w nowym oknie
Opis:
The formation of ice cover in winter on rivers, channels and run-of-reservoirs, changes flow characteristics significantly. Calculations of water surface profiles or discharge along a river reach with ice cover by means of 1-D models, requires detailed values of the roughness coefficients of the river bed and underside of the ice cover. Numerous studies dealing with roughness coefficients of the river bed with free surface flow were carried out in the past, however, very few investigations were performed on the determination of the roughness coefficient of the underside of ice cover. Data of calculations indicate that this coefficient may vary considerably with space and time, depending on the character of the ice cover, flow characteristics and meteorological conditions. In 1-D models roughness coefficient of the bed and of the underside of the ice cover must be combined into one composite roughness coefficient. The paper presents determination of roughness coefficient of the underside of ice cover based on velocity distributions in the Vistula River cross-sections with ice cover. It may be assumed that vertical velocity distribution has a logarithmic character in the regions near the bottom and ice cover. Taking into account this assumption the procedure for the calculation of Darcy-Weisbach friction factor f and Manning roughness coefficient n is proposed, basing on the data of velocity measurements in a given vertical. It was found that roughness coefficient of the underside of the ice cover varies in a much larger range than the bottom roughness coefficient and depends very much on the character of the ice cover.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling
Autorzy:
Białowąs, Barbara
Szymanowski, Karol
Tematy:
pine
densified
milling
roughness
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Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/2146685.pdf  Link otwiera się w nowym oknie
Opis:
Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling. The paper presents the results of research concerning the assessment of machinability of pine wood thermomechanically compacted. The assessment was made on the basis of the cutting forces and surface roughness after the milling process. Selected properties of native and modified wood were examined. Based on the research, it was found that compacted wood is characterized by higher cutting forces during milling. The surface quality after milling was examined and the roughness index Ra values were determined. The research shows that the modified wood is characterized by a lower Ra value both along and across the grain. Statistical analysis showed that the modification had a statistically significant effect on the values of cutting forces and the physical and mechanical properties of the tested wood.
Wpływ zagęszczania termomechanicznego drewna sosny (Pinus sylvestris L.) na siły skrawania oraz jakość obróbki podczas frezowania. W pracy przedstawiono wyniki badań dotyczące oceny skrawalności drewna sosny zwyczajnej zagęszczanej termomechanicznie. Oceny dokonano na podstawie sił skrawania oraz chropowatości powierzchni po procesie frezowania. Zbadano wybrane właściwości drewna natywnego i modyfikowanego. Na podstawie przeprowadzonych badań stwierdzono, że drewno zagęszczane charakteryzuje się wyższymi siłami skrawania podczas frezowania. Zbadano, jakość powierzchni po frezowaniu i określono wartości wskaźnika chropowatości Ra. Z przeprowadzonych badań wynika, że drewno modyfikowane charakteryzuje się niższą wartością wskaźnika Ra zarówno wzdłuż jak i w poprzek włókien. Analiza statystyczna wykazała, że modyfikacja wpływa w sposób istotny statystycznie na wartości sił skrawania oraz właściwości fizykomechaniczne badanego drewna.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of soil surface roughness on soil processes and remote sensing data interpretation and its measuring techniques - a review
Autorzy:
Herodowicz, Karolina
Piekarczyk, Jan
Tematy:
soil surface roughness, tillage treatments, soil processes, remote sensing, soil surface roughness measuring techniques
Pokaż więcej
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Powiązania:
https://bibliotekanauki.pl/articles/763024.pdf  Link otwiera się w nowym oknie
Opis:
Surface roughness is a very important physical feature of soil, affecting various soil processes and accuracy of remote sensing data interpretation. Thus, there is a need to describe it quantitatively. The main aim of the paper was to show needs and benefits of collecting quantitative information about soil surface roughness which is the most relevant parameter used as an index to predict water and wind erosion. Surface roughness can reduce soil erosion and soil losses even by up to 31%. Thereby, it increases the development of fauna and flora and improves the structure of soil and its biological quality. In the first section of the paper there are presented definitions of soil roughness proposed by different authors. The next section explains how various factors influence soil surface roughness. Then, the categorization of soil surface roughness discussed in literature is presented. The next part of the paper includes information about a role of soil roughness in agricultural, soil science and a hydrology research. Moreover, soil surface roughness plays an important role in a remote sensing of soils. The knowledge of quantitative soil surface roughness allows more accurate interpretation of the soil properties from remote sensing data, because this soil feature can decrease soil spectra even over 70% and makes their analysis difficult. In addition, deepening knowledge about soil roughness will allow more precise conclusions about the amount of reflected shortwave solar radiation indirectly shaping the Earth’s climate. In the final section, the techniques for measuring and indices for describing soil roughness are shown. However, the authors prefer a photogrammetry technique for collecting these data, because it is quick and easy to use, ensuring high resolution and accuracy of data (about 1 mm) and the image processing is currently simplifid as software to process is absolutely affordable.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 602

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