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Research on an Innovative FLEX Bicycle Frame with a Softtail Vibration Damping System

Kuczek Łukasz, Marczak Paweł, Muzykiewicz Wacław, Mroczkowski Marcin, Paćko Paweł, Drop Dawid

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 1

290--303

Bicycles are gaining more and more popularity, especially in crowded cities where there is a problem with traffic jams and a limited number of parking spaces. The bicycles are also often used by mountain bikers during riding on off-road trails. In both cases, the important parameters are the stiffness of the bicycle frame, the weight of the bicycle, but also driving comfort. To improve comfort and reduce vibrations in the bicycle frame both front and rear shock absorbers are used. The use of traditional shock absorbers increase the weight of the bike and its price. The work characterizes a modern damping system, Softtail type, designed by AG Motors. In this case, the damping element (elastomer) was placed directly in the rear fork. Analyses of polyurethanes of various hardness were carried out in terms of the possibility of using them as a vibration damper. A numerical and experimental analysis of the bicycle frame was performed, adapted to the a new shock-absorber system. Strength, fatigue and impact tests were carried out in accordance with the relevant bicycle standards. Research has shown that the frame bicycle with the Softtail system, meets the requirements of the standards.

Obrazowanie hiperspektralne w wykrywaniu defektów powłoki cynkowej na powierzchniach wytłoczek elementów karoserii samochodowej

Roemer Jakub, Zbyrad Paulina, Paćko Paweł, Uhl Tadeusz

Badania Nieniszczące i Diagnostyka

2019

nr 4

35--38

The paper presents an application of hyperspectral imaging for defect detection in stamped elements of a car body. Measurements were performed on zinc-coated stamped steel sheets. The aim of the experiment was to verify the effectiveness of hyperspectral imaging for detecting discontinuities of the zinc layer. Two-dimensional hyperspectral scanning was performed on prepared steel samples. Experimental results prove the effectiveness of the proposed method for detecting zinc coating damage under laboratory conditions.

W artykule przedstawiono wyniki badań nieniszczących elementów karoserii samochodowej metodą obrazowania hiperspektralnego. Eksperymenty przeprowadzono na wytłoczkach z blachy ocynkowanej. Celem badań było sprawdzenie możliwości wykrywania nieciągłości powłoki cynkowej na podstawie analizy odpowiedzi spektralnej pozyskanej drogą skanowania 2D. Wyniki badań potwierdziły przydatność metody do wykrywania defektów w warunkach laboratoryjnych.