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1
Content available Assessment of Wood Utility Pole Climbability Using Psychophysical and Mechanical Measurements
100%
Beauchamp Y. , Thomas M. , Arteau J. , Marchand D.
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tom Vol. 5, No. 1
3--28
EN
The issue of climbability has been raised on several occasions for more than a decade in North America. Presently, climbability is estimated from the pole hardness measured by the Pilodyn measurements (6 J). However, the use of Pilodyn measurements to discriminate the pole hardness value is criticized by climbers, who claim that the Pilodyn hardness measurement is affected by species-treatment combinations and that it does not reflect gaff penetration or climbability. Furthermore, climbability evaluations have been conducted in which test poles were climbed by linemen, and corresponding subjective ratings were recorded. However, the ability of psychophysical measurements to accurately discriminate close hardness pole values and to differentiate species-treatment combinations at specific hardness levels have not yet been fully documented. The aim of this study is to evaluate the psychophysical perception of linemen and the mechanical measurements of gaff penetration and gaff impact during the climbing of different wood species and treatment combinations in order to compare these results with Pilodyn measurements within a precise range of pole hardnesses, to study the relationships between these variables, and, finally, to propose various design guidelines for the development of a better tool for the evaluation of climbability.
2
Content available remote A Statistical Model for the Hairiness of Cotton/Polyester Blended OE Rotor Yarns
84%
Baykal P. D. , Babaarslan O. , Rizvan E.
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2007
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tom Vol. 15, no. 4 (63)
46--49
EN
This study aimed to predict the hairiness of cotton/polyester blended rotor yarns using blend ratios and yarn count as predictor variables. A simplex lattice design with two replications at each design point was constructed to determine the combinations of mixture ratios of the fibre types. Cotton/polyester blended slivers were used to produce rotor yarns with five different counts on a laboratory-type rotor spinning machine (quickspin). Mixture-process crossed regression models with two mixture components and one process variable (yarn count, linear density) were built to predict hairiness properties. All statistical analysis steps were implemented, using Design-Expert statistical software.
PL
Celem pracy było wykazanie możliwości przewidywania włochatości przędzy rotorowej mieszankowej bawełna/poliester biorąc pod uwagę procentowy udział poszczególnych składników w mieszance oraz masę liniową przędzy jako wejściowe zmienne niezależne. Opracowano specjalny model statystyczny dla oceny uzyskiwanych wyników. Na laboratoryjnej przędzarce rotorowej wytworzono pięć przędz mieszankowych o różnej masie liniowej z taśm bawełniano-poliestowych.
3
Content available remote Improvement of ductility for Twin Roll Cast and rolled AZ31 strips by use of Taguchi method
84%
Ullmann M. , Saleh H. , Schmitdchen M. , Kawalla R. , Vogt H. P.
Archives of Civil and Mechanical Engineering
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2013
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tom Vol. 13, no. 1
1--6
EN
Magnesium alloys have great potential in the area of lightweight production especially in the automotive industry due to their favorable combination of mechanical properties and low density. The effects of various rolling parameters on ductility were investigated using the Taguchi method. The optimum combination of process parameters has been found through analysis of main effects of ductility and signal-to-noise ratio, and the significant parameter were identified depending on analysis of variance. The results demonstrate that reduction is the most important factor for improving the ductility of the final strips, followed by rolling temperature and rolling speed. The optimal levels for the controllable factors were rolling temperature of 375 °C, rolling speed of 175 m/min and reduction of 70% for higher ductility.
4
Content available Modeling and optimization of friction stir stitching of AISI 201 stainless steel via Box-Behnken design methodology
84%
Ojo O. O. , Obasha I. O.
Production Engineering Archives
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2022
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tom Vol. 28, Iss. 2
132--140
EN
The paper investigates the modelling and optimization of the notch-repaired/friction stir stitched AISI 201 stainless steel welds via the use of a non-consumable tool-based repair process. The repair process employs a sequential hopping-stitching approach. This approach involves the application of two intercepted and completely overlapped plunging actions of a probe-less titanium carbide tool to create an effective refilling and repair of the notched zone. Box-Behnken design (BBD) was employed for the experimental planning, modelling, and optimization of the notch-repair process. Tool rotational speed, penetration depth and dwell time of the tool were the studied process parameters while tensile strength was the response variable. A quadratic model was identified as the best model for the notch-repaired welds based on the combination of a low sequential P-value of 0.008216, a high lack of fit P-value of 0.931366, and a close to unity adjusted and predicted R-square values. The process parameter and their interaction effects on the tensile strength of the repaired notch were identified via the ANOVA analysis. Plunge depth (main effect) and interaction effect of tool rotational speed and dwell time had significant influences on the notch-repair process and the resultant tensile strength of the AISI 201 stainless steel. The visual representations of these effects were shown through the 2D elliptical contour and 3D response surface plots. The optimized process parameters were identified as 1215.9795 rpm, 0.40262212 mm, and 5.98706376 s while the resultant notch-repaired joint yielded a tensile strength of 886 MPa, which is close to the predicted value.
5
Content available Distributed scheduling of measurements in a sensor network for parameter estimation of spatio-temporal systems
84%
Patan M. , Kowalów D.
International Journal of Applied Mathematics and Computer Science
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2018
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tom Vol. 28, no. 1
39--54
EN
The main aim of the paper is to develop a distributed algorithm for optimal node activation in a sensor network whose measurements are used for parameter estimation of the underlying distributed parameter system. Given a fixed partition of the observation horizon into a finite number of consecutive intervals, the problem under consideration is to optimize the percentage of the total number of observations spent at given sensor nodes in such a way as to maximize the accuracy of system parameter estimates. To achieve this, the determinant of the Fisher information matrix related to the covariance matrix of the parameter estimates is used as the qualitative design criterion (the so-called D-optimality). The proposed approach converts the measurement scheduling problem to a convex optimization one, in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gaged sites to the total measurement plan. Then, adopting a pairwise communication scheme, a fully distributed procedure for calculating the percentage of observations spent at given sensor locations is developed, which is a major novelty here. Another significant contribution of this work consists in derivation of necessary and sufficient conditions for the optimality of solutions. As a result, a simple and effective computational scheme is obtained which can be implemented without resorting to sophisticated numerical software. The delineated approach is illustrated by simulation examples of a sensor network design for a two-dimensional convective diffusion process.
6
Content available remote Taguchi approach for the optimisation of the bursting strength of knitted fabrics
84%
Mavruz S. , Ogulata R. T.
Fibres & Textiles in Eastern Europe
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2010
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tom Vol. 18, no. 2 (79)
78--83
EN
In this paper, the bursting strength of knitted fabrics was optimised using the Taguchi experiment design technique, which is a recently famous approach. In the evaluations, analyses of variance (ANOVA) and the signal to noise ratio were used. 9 experiments were performed with respect to the L9 orthogonal design for the Taguchi approach. The results show a considerable improvement in the S/N ratio as compared to the initial condition. With the Taguchi processes, we can easily determine optimum conditions for maximising the bursting strength of knitted fabrics with simple experiments.
PL
Przeprowadzono optymalizację siły rozrywania dzianin stosując metodą Taguchi. Dla oceny uzyskanych wyników przeprowadzono analizę wariancji za pomocą testu ANOVA oraz analizę stosunku sygnału do szumu. Przeprowadzono 9 eksperymentów uwzględniając ortogonalny schemat dostosowany do metody Taguchi. Wyniki wykazały znaczne polepszenie stosunku sygnału do szumu w porównaniu do warunków początkowych. Stosując metodę Taguchi możemy łatwo wyznaczyć optymalne warunki konieczne dla uzyskania maksymalnej siły rozrywania dzianin za pomocą łatwych eksperymentów.
7
Content available Technical assistance to the decision for the choice of a physical configuration
67%
Benmoussa R.
Polish Journal of Management Studies
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2011
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tom Vol. 3
44-60
EN
In this paper a technique for decision support for selecting a physical configuration are presented. This technique is useful during the redesign of a proposed restructuring of production processes resulted in a BPR approach. Based on the use of simulation and from the traditional experimental designs. It involves assessing the ability of the said configuration to cope with external and internal changes it faced. Our evaluation process is essentially based on the criterion of flexibility, this perverse concept and the ability of the configuration to accommodate the possible future directions for the installation of one or more measures of progress. Our work is illustrated by a case study.
PL
W artykule przedstawiono techniki wspomagania decyzji wyboru fizycznej konfiguracji. Przedstawiona technika jest przydatna w trakcie przebudowy planowanej restrukturyzacji procesów produkcyjnych co odzwierciedla podejście BPR, opierające się na korzystaniu z symulacji i tradycyjnych wzorów doświadczalnych. Technika polega ona ocenie zdolności tej konfiguracji do radzenia sobie z wewnętrznymi i zewnętrznymi zmianami. Proces oceny opiera się głównie na kryterium elastyczności, koncepcja ta jest przewrotna i daje możliwości konfiguracji w celu uwzględnienia możliwych przyszłych kierunków w zakresie instalacji jednego lub więcej środków postępu. Praca ilustruje studium przypadku.
8
Content available remote Modification of PA 6 by Comonomers and Layered Silicate
67%
Krištofič M. , Karabcová N. , Alexy P. , Ryba J. , Vassová I.
Fibres & Textiles in Eastern Europe
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2005
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tom Vol. 13, no. 6 (54)
33--35
EN
This paper deals with the synthesis of modifiers consisting of co-polyamide with clay prepared from co-monomers, namely from ε-caprolactam (CL) and nylon salt (NS) from adipic acid + diethylenetriamine (ADETA), and montmorillonite (MMT). We present a procedure for evaluating the modifiers’ properties, such as the amount of low molecular compounds (LMC) and the relative viscosity (ηr = ηs/η0) performed in accordance with principles of the five-level two-factor experimental design. Four selected samples were synthesised and their properties were checked.
PL
Artykuł omawia syntezę modyfikatorów, składających się z kopoliamidów z glikolami preparowanymi z komonomerów, takimi jak ε-kaprolaktam, sól nylonowa otrzymana z kwasu adypinowego z dwuetylenotriaminy oraz montmorylonitu. Przedstawiono procedury oceny właściwości modyfikatora, takich jak ilość nisko-molekularnych składników i lepkość względna (ηr = ηs/η0), przygotowanych zgodnie z zasadami pięciopoziomowego, dwuczynnikowego planu eksperymentu. Cztery wyselekcjonowane próbki poddano syntezie, a następnie określono ich właściwości.
9
Content available remote An Investigation On Air and Thermal Transmission Through Knitted Fabric Structures Using the Taguchi Method
67%
Ghosh A. , Mal P. , Majumdar A. , Banerjee D.
Autex Research Journal
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2017
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tom Vol. 17, no. 2
152--163
EN
Knitted fabrics have excellent comfort properties because of their typical porous structure. Different comfort properties of knitted fabrics such as air permeability, thermal absorptivity, and thermal conductivity depend on the properties of raw material and knitting parameters. In this paper, an investigation was done to observe the effect of yarn count, loop length, knitting speed, and yarn input tension in the presence of two uncontrollable noise factors on selected comfort properties of single jersey and 1×1 rib knitted fabrics using the Taguchi experimental design. The results show that yarn count and loop length have significant influence on the thermo-physiological comfort properties of knitted fabrics.
10
Content available remote Prediction of Strength and Elongation Properties of Cotton/Polyester - Blended OE Rotor Yarns
67%
Baykal P. D. , Babaarslan O. , Erol R.
Fibres & Textiles in Eastern Europe
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2006
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tom Vol. 14, no. 1 (55)
18--21
EN
This study aims to predict the strength and elongation properties of cotton/polyester blended rotor yarns, using blend ratios and yarn count as predictors. A simplex lattice design with two replications at each design point is constructed to determine the combinations of the fibres’ mixture ratios . Prepared cotton/polyester blended slivers were used to produce rotor yarns with five different counts on a laboratory-type rotor spinning machine (quickspin). Based on experimental observations, mixture-process crossed regression models with two mixture components and one process variable (yarn count) are constructed to predict strength and elongation properties. All statistical analysis steps are performed on Design-Expert statistical software.
PL
Artykuł omawia przewidywanie wytrzymałości i wydłużenia mieszanek przędz bezwrzecionowych rotorowych na podstawie masy liniowej przędz i ich proporcji w mieszance. Dla określenia kombinacji proporcji przędz w mieszankach, zaprojektowano prostą strukturę sieciową z dwoma możliwościami powielania w każdym z punktów struktury. Z przygotowanych taśm mieszankowych bawełniano-poliestrowych wyprodukowano na laboratoryjnej przędzarce rotorowej (typu ‘quick-spin’) przędze rotorowe o pięciu masach liniowych. W oparciu o obserwacje eksperymentu opracowano modele regresyjne procesu mieszania z dwoma składnikami mieszania (bawełna i poliester) i jedną zmienną (masa liniowa), służące do przewidywania wytrzymałości i wydłużenia. Wnioski kroków analizy statystycznej były zrealizowane za pomocą programów komputerowych „Design-Expert”.
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