Wyniki wyszukiwania - BazTech

1

Modification of the adhesive force by changing the radial reaction on vehicle wheels

Jilek Petr, Krmela Jan, Berg Jan

Transport Problems

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2021

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T. 16, z. 1

179--186

EN

This article deals with the possibilities of adhesion force changes of a road vehicle. The authors present the possibilities of reducing the adhesion force of road vehicles and, at the same time, present their own system for changing the radial reaction of the vehicle wheels. This system removes the disadvantages of a commercially available SkidCar system. A representative road test is chosen in the article to determine the stability in a straight-line drive. Furthermore, the authors report the courses of characteristic parameters describing the behavior of a vehicle for driving a conventional car on a sliding surface and compared to the 50 % radial reaction of a vehicle driven with the SlideWheel on dry asphalt. It is clear from the measured runs that it is possible to change the adhesion force by changing the adhesion weight transmitted by the vehicle wheels. The use of the proposed SlideWheel system is possible for the purpose of verifying vehicle stability, while improving the driver's ability to operate the vehicle under reduced-adhesion conditions. The main goal of this paper is to design a system for reducing the adhesive force in an experimental car and perform experimental measurements.

2

Experimental Investigation and Optimization of Machining Parameters in Turning of Aluminum Alloy 075-T651

Srivastava Arpit, Verma Mukesh Kumar, Niranjan Ramendra Singh, Chandra Abhishek, Patel Praveen Bhai

Production Engineering Archives

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2021

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Vol. 27, Iss. 4

296--305

EN

Aluminum alloy 7075-T651 is a widely used material in the aviation, marine, and automobile sectors. The wide application marks the importance of this material’s research in the manufacturing field. This research focuses on optimizing input process parameters of the turning process in the machining of Aluminum 7075-T651 with a tungsten carbide insert. The input machining parameters are cutting speed, feed, and depth of cut for the output response parameters cutting force, feed force, radial force, material removal, and surface roughness of the workpiece. For optimization of process parameters, the Taguchi method, with standard L9 orthogonal array, is used. ANOVA is applied to obtain significant factors and optimal combinations of process parameters.

3

Sztywność promieniowa łożysk kulkowych wzdłużnych

Kaczor J., Raczyński A.

Przegląd Mechaniczny

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2011

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nr 10

39-44

PL

W artykule zaprezentowano sposób określenia zależności między siłą promieniową obciążającą łożysko kulkowe wzdłużne a przesunięciem promieniowym jednego pierścienia względem drugiego. Przesunięcie takie może się pojawić w typowym łożyskowaniu i w konsekwencji doprowadzić do przedwczesnego zużycia łożyska. Metodę określenia tej zależności (nazwanej sztywnością promieniową) zilustrowano przykładowymi wynikami obliczeniowymi, uzyskanymi za pomocą programu komputerowego.

EN

Method of determination the relationship between the radial force loading the bearing and radial displacement of one ring relative to the other was presented in the paper. Such displacement may occur in a typical bearing and consequently lead to premature wear of bearing. The method of determining this relationship (called radial stiffness), was illustrated by examples of computational results, obtained using suitable computer program.

4

Mechanical, biological, and microstructural properties of biodegradable models of polymeric stents made of PLLA and alginate fibers

Bartkowiak-Jowsa M., Będziński R., Szaraniec B., Chłopek J.

Acta of Bioengineering and Biomechanics

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2011

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Vol. 13, no. 4

21-28

EN

Due to lack of effective methods for preventing the complications associated with stent implantation, the search for new solutions is conducted, including those based on the use of biodegradable polymers. Such materials could allow us to develop a temporary implant that would ensure flow in the vessel until its regeneration, while minimising the negative effects connected with long--erm implant–tissue interaction. In this study, models in the form of biodegradable stents of different materials and geometry were prepared. Due to the fact that one of the basic requirements imposed on vascular stents is the ability to resist radial loads caused by the surrounding tissue, the maximum radial forces causing destruction of prepared models were investigated. The results were compared with the values obtained for commercially used metallic implants. Models were also incubated in Eagle's medium enriched with albumin in order to assess potential adhesion capacity of proteins on their surface. Scanning electron microscope enabled monitoring of microstructural changes during incubation. The results obtained were used to evaluate the ability to obtain a functional, biodegradable vascular stent.

5

Wpływ geometrii przekroju poprzecznego warstwy skrawanej w strefie przy osi wiertła na jego obciążenie

Nowakowski Z.

Archiwum Technologii Maszyn i Automatyzacji

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2004

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Vol. 24, nr 2

69-76

PL

W artykule przedstawiono wyniki pomiarów sił dla różnych konstrukcji wierteł z płytkami wymiennymi. Pomiary wykonano podczas obróbki stali WCL w stanie miękkim (295 HV02) i zahartowanym (58 HRC). Przeanalizowano wpływ przekroju poprzecznego warstwy skrawanej w strefie przy osi wiertła na wartość siły promieniowej F,7, oraz wypadkowej siły odporowej Fp. Oceniono zmiany stosunku obciążenia ostrza wewnętrznego do zewnętrznego dla wiertła z płytkami wymiennymi w zależności od stanu materiału obrabianego (miękki, zahartowany).

EN

In the article results of forces measurements for various constructions of indexable insert drills have been shown. Measurements have been carried out during machining of the WCL steel in soft (295 HVo,2) and hardened (58 HRC) state. Influence of cut form in zone near axis of the drills on value of radial force F,.p and resultant thrust force F,, has been analyzed. Comparison of changes of load on internal wedge to load on external wedge ratio for given construction of indexable insert drill depending on state of work material (soft, hardened) has been done as well.