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Projekt stabilizatora o regulowanej sztywności zastosowany w pojeździe klasy Formula Student : metody regulacji

Woźnicki B., Wieczorek B., Warguła Ł., Waluś K. J.

Autobusy : technika, eksploatacja, systemy transportowe

2017

R. 18, nr 12

1425--1429, CD

Zadaniem stabilizatora jest wzrost sztywności kątowej danej osi, co prowadzi do ograniczenia bocznych przechyłów nadwozia podczas jazdy w zakręcie. Sztywność układu wpływa na kierowalność, przyczepność oraz bezpieczeństwo. Dlatego też istotnym czynnikiem wpływającym na zachowanie się pojazdu na drodze jest możliwość zmian sztywności układu w zależności od panujących warunków drogowych jak i prędkości. W artykule przedstawiono dwie koncepcje sterowania sztywnością stabilizatora w pojeździe klasy Formula Student.

The purpose of the stabilizer is to increase the angular rigidity of the axle, which leads to the limitation of lateral overturning when running in the bend. Stiffness affects steering, grip and safety. Therefore, an important factor influencing the behavior of the vehicle on the road is the possibility of changing the rigidity of the system depending on the prevailing road conditions and speed. The article presents two concepts of stiffness control in a Formula Student vehicle.

Improved wire stiffness with modified connection bolts in Ilizarov external frames: a biomechanical study

Gessmann J., Jettkant B., Königshausen M., Schildhauer T.A., Seybold D.

Acta of Bioengineering and Biomechanics

2012

Vol. 14, no. 4

15-21

Frame stability in Ilizarov external fixators is mainly dependent on the tension of the transosseous wires, which are clamped to the ring by connection bolts. It was the purpose of this biomechanical study to investigate the holding capacity of a modified bolt design featuring a ruffled wire-bolt interface (TrueLokTM0 and its influence on wire stiffness in comparison with that of classic bolts featuring a smooth, unruffled wire-bolt interface. Six different ring and bolt configurations were tested using a simplified model consisting of a single ring and wire. The holding capacity at two different tightening torques (10 and 14 Nm) of classic cannulated bolts (CB) and slotted bolts (SB) was determined on Ilizarov and Taylor Spatial Frame (TSFTM) rings, whereas the modified TrueLokTM CBs and SBs were used with the TrueLokTM rings. The wire stiffness was calculated via a regression analysis of the load-displacement graphs. The modified TrueLokTM bolts demonstrated significantly better slippage resistance than the classic bolts in all configurations and wire stiffness was significantly higher in the TrueLokTM frame set-ups. After maximum loading, all of the wires showed plastic deformation, including constant wire deflection and dent marks at the clamped wire ends. In conclusion, the decrease in wire stiffness can be explained mainly as a result of wire slippage, but plastic deformation and material yielding also contribute. The relatively simple modification made by roughening the wire-bolt interface results in improved holding capacity and wire stiffness. A frame that contains these modified TrueLokTM bolts should provide improved mechanical stiffness.