- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHAO Zhenhua, WANG Pu, GAO Yuan, WANG Shuguo. Calculations for Transition Displacement and Design Optimization for Moveable Point Frog[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230294
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To reduce insufficient displacement in the contact area between the movable point frog’s point rail and wing rail, minimize transition force at the transition points of point rail, and improve the frog’s longitudinal smoothness, an optimization method for the design parameters and key components of movable point frogs was proposed. The minimum flangeway width of the No.18 movable point frog was selected as the optimization target. Based on the existing structural parameters and finite element method, a model for point rail transition calculation was established, and the method of successive approximation was used to optimize the design method of the transition displacement curve of the point rail. Under the different frog form and position tolerances for both straight/diverging lines, an optimized design was proposed with a second traction point stroke of 50.7 mm, along with the structural design scheme for key components of the frog in the straight-through state. The results show that the maximum deviation between calculated and designed point rail transition displacements is 6.64 mm, occurring at the elastic bending center. The computed minimum flangeway width (90.7 mm) closely matches the measured average value (90.9 mm), ensuring safe vehicle passage. Additionally, the second traction point stroke is reduced by 8.3 mm compared to existing frog designs, lowering the required transition force at the second traction point.
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