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Volume 10 Issue 05 (May 2023)

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Title : Study on Porosity of WC-12Co Coating on 40Cr Steel Base by Explosive Method

Authors : Pham Van Lieu

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Abstract :

Detonation spray is one of the thermal spray methods that is used to coat the surface of the part or restore the shape and size of the worn shaft part very effectively. The basic criteria of the coating to be achieved are the adhesion strength between the coating and the base metal layer and porosity. In this paper, the author focuses on studying the influence of spray speed, spray distance on coating porosity. The results show that with spray speed v = 1000mm and distance L = 300mm, the coating has the best porosity. This is an important criterion to determine the parameters of injection technology, so that the surface coating of the shaft-shaped part has both lubricating properties during working and has high durability


Title : Research on Signal Control at Single Point Intersections Based on Passive Bus Priority

Authors : Sun Ming-Yao, Guo Rui-Jun

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Abstract :

To address the problem that the passive bus priority method with the objective of "minimum passenger delay" may cause an increase in the number of non-priority phase stops, a two-stage improvement optimization model is developed, which is divided into two steps: the first step is to find the minimum intersection passenger delay, and then the delay is appropriately increased by a certain range on this basis, so as to determine the bus priority The first step is to find out the minimum delay of passengers at the intersection, and then the delay is appropriately increased by a certain range, thus determining the set of solutions for bus priority signal timing, and then selecting the solution that minimizes the number of non-priority phase stops from the set of solutions. The particle swarm algorithm is used to solve the model, and the specific ideas and steps are given. The intersection of Huanghe Road-Guangping Street in Dalian City, Liaoning Province, is selected as the study object, and the effectiveness of the improved optimization model is examined by using VISSIM. The results of the empirical simulations show that the improved optimization model can achieve bus priority and reduce the stopping rate of non-priority phases within an acceptable range of delay increase compared to the passenger delay minimum model.