Modeling and implementation of EMU traction system based on top down design

doi:10.11996/JG.j.2095-302X.2024020347

Abstract

Abstract:

With the increasing complexity of rail transit products and the development of intelligent level, the design of electric multiple units (EMU) traction systems demands more effective requirement analysis methods, more reliable modeling analysis methods, positive traceability design methods, and high-quality implementation forms. Taking the traction system of EMU as the research object, this study utilized the requirements analysis model based on system modeling language (SysML) language and combined it with a modeling analysis method based on the standard requirement-function-logical-physical (RFLP). Starting from the design requirements of the traction system, a complete use case analysis was carried out, leading to the creation of a functional model of the traction system, including both the architecture model and the state machine model. The interactive information between the traction system, external system, and internal subsystems was displayed through block definition diagram and internal block diagram. The operation scenarios of the traction system were realized through UI interfaces, and the state changes of the traction system during operation were displayed. Functional logic simulation of the traction system was realized, and a positive traceable design and implementation scheme of the traction system was formed. The design method based on model-based systems engineering (MBSE) was applied to the design process of EMU, thereby providing forward design guidance for the design of EMU.

Key words: electric multiple units, traction system, MBSE, SysML, RFLP

CLC Number:

TP391

WANG Haifang, ZHANG Lei, WANG Xin, SUN Minghui, XUE Lianmin. Modeling and implementation of EMU traction system based on top down design[J]. Journal of Graphics, 2024, 45(2): 347-354.

Figures/Tables 14

Fig. 1 Modeling methodology process

Fig. 2 Requirements form of traction system ((a) Requirements table; (b) Requirements diagram)

Fig. 3 Use case analysis of normal operation of traction system

Fig. 4 Black box activity diagram for “traction acceleration” in the traction system

Fig. 5 White box activity diagram for “achieving traction”

Fig. 6 Functional module for “achieving traction”

Fig. 7 Logical interface diagram of traction system

Fig. 8 Weight distribution model of traction system

Table 1 The actual value of each standard

方案	成本/ 万元	重量/ kg	体积/ cm³	可靠性/ h	功率/ kVA
主辅分离车控	350	4 240	6 160	3 100	3 200
主辅一体架控	340	3 750	9 130	3 200	1 500
主辅一体轴控	400	4 000	10 690	3 500	3 800

Table 2 MOE scores for each scheme

解决方案	成本/ 万元	重量/ kg	体积/ cm³	可靠性/ h	功率/ kVA
主辅分离车控	8.3	0	10.0	0	7.4
主辅一体架控	10.0	10.0	3.4	2.5	0
主辅一体轴控	0	4.9	0	10.0	10.0

Table 3 Objective function calculation

项点	权重	主辅分离车控		主辅一体架控		主辅一体轴控
项点	权重	值	得分	值	得分	值	得分
成本	0.30	83.0	2.49	10.0	3.000	0	0
重量	0.20	0	0	10.0	2.000	4.9	0.98
体积	0.20	10.0	2.00	3.4	0.680	0	0
可靠性	0.15	0	0	0.5	0.375	10.0	1.50
输出功率	0.15	7.4	1.11	0	0	10.0	1.50
得分汇总			5.60		6.055		3.98

Fig. 9 State machine model of traction system

Fig. 10 Simulation verification of traction system ((a) Control panel; (b) Operating curve)

Fig. 11 Traction system physical interface diagram

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