ORIGINAL_ARTICLEThis paper deals with carboxymethyl cellulose crosslinking to reduce absorption and swelling. Crosslinking can be done by various ways such as radiological and chemical. These two methods have already been deeply described. Therefore, this work deals with thermal crosslinking using self-crosslinking properties of carboxymethyl cellulose. Carboxymethyl cellulose (CMC) has self-crosslinking properties due to its hydroxyl and carboxyl groups under the formation of ester groups. CMC samples were prepared in two versions: firstly as thin films and secondly as CMC coated polyester fabrics. The process was conducted in a heated box at various temperatures and for varied time periods. During the measurements both versions of samples were tested for water absorption.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_01.pdf2012-08-31613KarolínaBorůvková1AUTHORJakubWiener2AUTHORSahilKukreja3AUTHOR

ORIGINAL_ARTICLEHuman performance has significantly changed in recent years in interaction with new technologies. Employees through the whole human society had to acquire a new set of skills and abilities. There is a fundamental change of human performance dynamics and efficiency. Operators of various operations and maintenance personnel are now able to affect more parts of the system and more system parts’ functions in a shorter time. They are able to remotely control the system, which previously had to be reached manually in a specific position or by a larger number of workers. Hand in hand with that, new types of human errors have occurred. To face that, we have to find new ways to analyze human performance. We have to deal with more complex and reliable systems, whose reliability brings new paradoxical phenomena in relation to humans.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_02.pdf2012-08-311421RadimDoležal1AUTHOR

ORIGINAL_ARTICLEThis project deals with the problem of the static position setting control of the ambulance couchette support. The static position is adjusted by an air spring, which serves as an active vibration insulation element. The vibration insulation mechanism is also described. Various types of control are designed, compared and afterwards the optimal type of control is selected. The project includes the possible connection schemes. Based on measurement, the optimal tube diameter is chosen to inflate an air spring with compressed air.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_03.pdf2012-08-312229OndřejKohl1AUTHOR

ORIGINAL_ARTICLEAnthocyanins are plant pigments of special interest for their colour changes in different acidic media. In the food industry they are used as colourants and as antioxidants, in food they play the role of natural antioxidants and historically they were used in textile dyeing. The advantage of anthocyanins is their medical safety, easy availability of renewable resources, and the possibility of recovery of canning and wine pressings. The disadvantage is a colour instability and susceptibility to physical and chemical conditions that limits their use and further processing. This study looks at testing the rate of decomposition of anthocyanins in the juice of blueberry, elderberry and extract of blue grape vine remnants by alkaline medium exposure, high temperatures and UV radiation and discusses the suitability of their use in textile dyeing.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_04.pdf2012-08-313040HanaKřížová1AUTHORJakubWiener2AUTHOR

ORIGINAL_ARTICLEDespite the fact that fusion welding simulations have been used for over 20 years, their wider application has become evident only in the last 4 years. The reason is that there are both high requirements on quantity and quality of the input material data, and mainly high requirements on the accurate definition of the heat source model from which the non-stationary temperature field and temperature gradient are derived. For the conventional fusion welding methods simulation (except for the laser and electron beam), the double-ellipsoid heat source model is commonly used. However, a description of such a heat source model depends on many variables. The method that is presented in this paper could be used for the heat source parameters optimization. The method is based on fitting the computed weld pool shape to the measured one. It is a recurrent process using a simplex optimization method.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_05.pdf2012-08-314148JaromírMoravec1AUTHORMilošMoravec2AUTHOR

ORIGINAL_ARTICLEThe article deals with physiological properties of garments made of environmentally friendly materials such as viscose fibers made from bamboo plants, which are a unique biodegradable textile material. In this investigation, thermophysiological properties of knitted fabrics made from cotton and fabrics made from viscose fibers made from bamboo plants were studied. The results were discussed and presented graphically and the effect of the type of fibers on thermophysiological properties was observed for both fabrics. Although cotton fabrics are widely and commonly used in tropical weather conditions, it was found out, that the fabrics made from viscose fibers made from bamboo plants also showed enhanced thermophysiological properties.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_06.pdf2012-08-314957Motawe MohammadHemaia1AUTHORAntonínHavelka2AUTHORZdeněkKůs3AUTHOR

ORIGINAL_ARTICLEThis paper focuses on issues surrounding the scanning of the human body surface using the MaNescan® system. The basic philosophy consists of using a 2D method of active triangulation based on the cylindrical principle. The output is 3D data imported into a 3D programme called CATIA with an image of a standing or seated figure in digital form. In this 3D environment, the demonstration of manipulation of the complete object, its measurement and the evaluation of accuracy of the measured body dimensions is a non-contact method. It presents a strategy to measurements of the population without contact and to obtaining data for anthropometry. This enables to monitor the growing increase in the size of the human body and its subsequent variability. It can be applied to anthropology, to design clothes, linen and while considering the ergonomics of the design of machines and equipment.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_07.pdf2012-08-315867MarieNejedlá1AUTHOR

ORIGINAL_ARTICLEVibratory conveyors are used especially in serial productions that concentrate on the transport of both assembly parts and diverse materials. They are designed for two main motions which are translational and spiral motion. As for the first mentioned motion the carrying element can be a chute or a pipe, whereas the second motion is relevant to cylinders having an integrated spiral carrying surface. The oscillating movement is accomplished by the exciting force, of which frequency is equal or very close to the own natural frequency of the carrying element. Exciting force is created by the rotation motion of an eccentrically placed mass resp. an electromagnet. Kinematic motion of transported elements in vibratory conveyors is the topic of the following article. Kinematic motion is a major factor in the functionality and performance evaluation of transport devices such as the vibratory conveyor.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_08.pdf2012-08-316876MarekPešík1AUTHOR

ORIGINAL_ARTICLEFor many years an effective design of car seat vibro-insulation has been an unsolved problem, which affects the feeling of security and quality of sitting. This problem is currently much more demanding, due to the requirements to use low-power recycled materials, and to reduce the seat weight. A dynamic system “driver – seat” has a very low resonant frequency, which makes it challenging to set the optimal vibro-insulation properties. Possible solutions of this complex problem consist of replacement of the current passive elastic support of seat by an actively controlled system with a visco-elastic composite support. For this purpose the design of an actively controlled system of reinforcements was carried out. To assess the load capacity, stability and distribution of major stresses in the active adjustable supports, FE model simulations were performed.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_09.pdf2012-08-317784MichalPetrů1AUTHOROndřejNovák2AUTHORPavelSrb3AUTHOR

ORIGINAL_ARTICLEComfortable seat layers are in most cases filled with polyurethane foam. The equilibrium position of the automobile seat represents the static loading of polyurethane block. Thanks to simulations it is possible to predict the final position of the human body, which is important for passive safety features such as airbags. This article describes the measurement and simulation of static loading of the foam block by circular indentor, rigid dummy and compares two simulation environments. Analyses of static tests are determined by the force/displacement characteristic and pressure distribution in the contact zone. Material models of polyurethane foam can be used for the complete seat H-point achievement simulations by EHK17. It is possible to optimize the comfort layer of mechanical properties in the simulation environment and thus save the cost of prototyping seats.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_10.pdf2012-08-318592JanPetřík1AUTHORPavelSrb2AUTHOR

ORIGINAL_ARTICLEPoland is threatened by occurrence of storms. Counteracting their effects is executed by the Polish government, especially the minister of Interior, minister of the environment and the minister of transport, construction and maritime economy. The law regulations enable preventing the negative consequences of the storms.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_11.pdf2012-08-3193102ZbigniewPiepiora1AUTHOR

ORIGINAL_ARTICLEThe classical Maxwell rheological model is a serial combination of Newtonian viscous fluids (a purely viscous damper) and elastic materials (a purely elastic spring). Rheological models of some materials (nonwovens, hihgloft materials) require replacing linear stress/strain dependence of the string by non-linear (quadratic, in presented case) stress/strain dependence of the frictional component. The article describes the behavior of that modified Maxwell rheological model for the most common experimental modes, i.e. constant speed of deformation, constant strain, and constant relative deformation. Furthermore, the results of asymptotic behavior of both models are compared.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_12.pdf2012-08-31103108JanaPřívratská1AUTHOR

ORIGINAL_ARTICLEThe paper is concerned with optimization of the new structure of small-diameter knitting machines, with the aim of analyzing dynamic behaviour of the system when employing new lift dependence of principal operating elements. The paper presents a proposal of such a lift dependence that might provide for elimination of impacts during transitions among the individual areas of lift dependence. This lift dependence employs the 7th degree polynomials for elimination of impacts. For the description of the mechanical driving system there has been employed the method of Lagrange equations of the second kind. The equations have been solved in the software Matlab and in its superstructure Simulink. As the result, courses of kinematic variables of the driving and technological systems of the machine have been obtained.https://acc-ern.tul.cz/archiv/PDF/ACC_2012_1_13.pdf2012-08-31109116JosefSkřivánek1AUTHORMartinBílek2AUTHOR