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Maintenance Costs Across Sectors
Published in Diego Galar, Peter Sandborn, Uday Kumar, Maintenance Costs and Life Cycle Cost Analysis, 2017
Diego Galar, Peter Sandborn, Uday Kumar
The models are analyzed using CATLOC software. Findings show that carrying hazardous materials 1100 km using the variable-gauge wheel sets is much more effective than using the present bogie exchange. The LCC for variant 2, over 25 years of operation, is €3.62 million or 20.8% lower than for variant 1 (Figure 7.4a). The fundamental difference between variants appears in the acquisition costs: 33.0% lower for variant 2 (Figure 7.4b).
Optimisation of wheel profile of variable gauge high-speed trains
Published in Vehicle System Dynamics, 2023
Yayun Qi, Huanyun Dai, Feng Gan, Hao Gao
The variable gauge high-speed trains are mainly accomplished by the mechanism on the wheelset, which consists of the wheelset axle, the wheels, the sleeves and the spline keyways, with the wheel over-fitted on the sleeve and the sleeve fitted to the axle with clearance. The torque is transmitted via the spline keyway between the sleeves and the axle, as shown in Figure 1(a). When the gauge changes, the wheel and the sleeve lateral move together. The wheelset is modelled by the axle and the two wheels independently, considering the clearance between the axle and the sleeve, and considering the sleeve and the wheel as a single unit. While the variable distance between the backs of wheel flanges requires separate modelling of the left and right wheel and axle. Piecewise linear spring-damped parallel force elements were used to model the sleeve and wheel axle clearance, including axial (lateral) and circumferential (rotational), which is shown in Figure 1(b). The displacement replaces the clearance between the wheel axle and the sleeve. The force replaced the force between the wheel axle and sleeve. The entire wheelset is modelled as shown in Figure 1(c). The wheelset model is built and imported as a substructure into the full vehicle dynamic model. The detail is referred in [20].
Optimal design of variable suspension parameters for variable-gauge trains based on the improved CRITIC method
Published in Journal of the Chinese Institute of Engineers, 2023
Yumei Liu, Ting Hu, Jiaojiao Zhuang, Jiaxiang Sheng
Because of changes in the operating conditions of variable-gauge trains, their dynamic performance will no longer maintain the optimal state or exceed the limit value. Therefore, it is necessary to use a variable suspension system for variable-gauge trains. Based on the above studies, the parameters of the variable suspension system of variable-gauge trains are shown in Table 4.