PSI - Issue 24

Claudio Braccesi et al. / Procedia Structural Integrity 24 (2019) 612–624 Braccesi et al./ Structural Integrity Procedia 00 (2019) 000 – 000

620

9

Fig. 7. Example of Polyurethanic wheel and of a rollercoaster wheels group

[no units] [s] 0.532 2.6∙10 -5 0.034 0.007 0.072 0.009 0.016 0.0062 0.260 2.6∙10 -5 Table 1: Material. Prony series coefficients

Table 2: Material. Coefficients of Mooney-Rivlin potential

Parameter

Value

Unit [Pa] [Pa]

10 01

21428571

0

9.33∙10 -9

[Pa -1 ]

Table 3: Tested Wheels. Geometrical parameters

[mm] [mm] [mm]

Type A

Type B

Type B

250

350

380

60 16

90 10

90 10

It is characterized by an overall length of 341 m, by a maximum travel speed of 14 m/s (Figure 6), by a duration of the single run of 63 s and by a maximum load value on the single wheel of 7120 N (Figure 7). The vehicle and wheel behavior has been simulated by a commercial multibody code (MSC.Adams/View) customized by authors to model generic vehicles and tracks [Braccesi et al. (2015), Braccesi et al. (2018)]. From the dynamic analysis, the time histories of force and speed at the center of the wheel were obtained in the local reference system (Figure 7). The assessing technique of temperature distribution of a generic roller coaster wheel when a generic track is traveled has been applied to three different wheels that will be called "wheel A", "wheel B", and "wheel C" (Figure 8). The parameters of the material used to model the polyurethane are given in Table 1 and 2. Wheels outside diameter ( ), width ( ) and the peripheral polyurethane region thickness ( ) are reported in Table 3. Wheel B has an outside