ORIGINAL_ARTICLEThe paper is concerned with an analysis and optimisation of the needle transfer mechanism by means of the software Pro/Engineer Wildfire 4 with the aim to reduce the noise at high r. p.m. of the machine. There has been carried out an optimisation of selected parameters of the mechanism with the aim to avert the vibration of the element that controls the moment of release of the needle during its transfer from one needle bar to the other one. Subsequently, there is carried out a sensitivity analysis of the effect of designing parameters of the mechanism upon the velocity of impact of the controlling element upon the machine frame. On the basis of the results of the analysis and optimisation, there have been proposed modifications of the design of the needle transfer mechanism, and subsequently, they have been verified experimentally by measuring the sound pressure on a functional model.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_01.pdf2010-06-30513JaroslavBeran1AUTHORKarelPejchar2AUTHORJiříKomárek3AUTHOR

ORIGINAL_ARTICLEA variety of biopolymers, such as starch compounded synthetic polymers or acetylated starch, have been proposed as promising candidates for tissue scaffolding. Electrospinning has become a unique technique for generating three dimensional matrices of those biopolymer matrix scaffolds. Finally, both starch blended biopolymer scaffolds and modified starch are capable of promoting cellular activities, which are essential in regenerative medicine.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_02.pdf2010-06-301421Robertus WNNugroho1AUTHORDavidLukáš2AUTHOR

ORIGINAL_ARTICLEThis paper describes possible approaches to process standardization procedures using the example of a project. Starting with the identification and selection of processes with standardization potential in the preliminary study, the modelling of process standards is carried out in the next step - the concept phase. Reflections on typical situations in the definition of process standards, taking into account the process of mass customization, show three approaches. Differences arise in the standardization of several process levels, of process interfaces and of the creation of standard variants. Finally, the article addresses the implementation and controlling of the process standards. Changes in customer requirements and process innovations mean that process standardization is not a onetime project, rather an ongoing activity.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_03.pdf2010-06-302231FalkMaiwald1AUTHORThomasReicks2AUTHOR

ORIGINAL_ARTICLEWelding is a special process, that is carried out in a very short time interval with a small melting area and non-linear dependences. Consequently it is rather difficult to describe this process. The computations of temperature fields are based on thermal-physical data given by the Fourier differential equation and on the temperature dependence of the coefficient of the heat transfer into the environment. The heat transfer coefficient is an example of how difficult it is to acquire quality input data for simulation computation. It changes depending on the type of plane: vertical, horizontal or inclined angle-wise. It also matters if it is an upper surface of a plate or a lower surface of a plate, because the difference can be up to 30%. Simulations in the Sysweld programme will show how different types of the coefficient of heat transfer into the environment can influence the overall simulation computation result.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_04.pdf2010-06-303239JaromírMoravec1AUTHOR

ORIGINAL_ARTICLEThe authors analyze the internal information flow in an enterprise. The authors define the concept of logistics in modern and classic approaches. They will also discuss main subjects which, in their opinion, influence logistics most, like planning, purchasing, and information infrastructure. Also they try to define what is an issue of integrated structure in enterprise and how it is related to modern logistics. Last speculations regard e-business as a new phenomenon which determines new approaches to business thinking. The authors will state there their research results and practical examples in Paper Machinery Producers with a commentary and proposed solution.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_05.pdf2010-06-304049MaciejPawłowski1AUTHORRadosławPawłowski2AUTHOR

ORIGINAL_ARTICLECurrently, great emphasis is placed on improving and optimizing of sitting comfort (car seats, chairs, sofas, hospital mattresses...). The comfort is also related to safety, quality, air permeability and ergonomics, which all depend on the mechanical properties of the used material. Polyurethane foams (PU) are most widely used for comfort layers. PU together with upholstery fabrics creates complete comfort layers. With the rapid oil disappearance and its price growth there are efforts to find new solutions which allow replacing PU foam with suitable materials. Preferably recyclable materials are wanted for that purpose. An experimental quasi-static indenting of a load body to a PU sample is the starting point for simulations. Obtained experimental data are used as a comparison for the model simulated in FEM. An evaluation criterion is essentially the contact pressure of the tested sample.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_06.pdf2010-06-305059MichalPetrů1AUTHOROndřejNovák2AUTHOR

ORIGINAL_ARTICLEThe paper is concerned with the problems of the frame of small-diameter knitting machines. The knitting machine frame undergoes designing alterations nowadays, directed to minimisation of production costs. This trend entails a decrease of the stiffness of its structure. One of the most important parts of the frame is the silent-block, serving as vibration-insulating element between the base plate and the frame of the machine. In the paper there are ascertained the visco-elastic properties of three types of silent-blocks, employed in knitting machines.https://acc-ern.tul.cz/archiv/PDF/ACC_2010_1_07.pdf2010-06-306066JosefSkřivánek1AUTHORMartinBílek2AUTHOR