For good vibration alleviating properties, polymer concrete has attracted much attention in the field of elementary machine components. In this article, glass fiber and carbon fiber were applied to improve the mechanical properties of polymer concrete. Seen from the experimental results, as far as compression strength is concerned, fiber-reinforced polymer concrete is better than polymer concrete, and carbon fiber-reinforced polymer concrete is better than glass fiber reinforced polymer concrete. However, considering both technical and economical factors, it could be concluded that glass fiber is the proper strengthening fiber for polymer concrete.

No abstract

Vehicle fuel cell systems release a large amount of heat while generating electricity. The suitable thermal management system must be built to ensure system performance and reliability. Based on the analysis of the working principle of the vehicle fuel cell thermal management system, the paper establishes a control-oriented fuel cell thermal management. The stack, air cooler, hydrogen heat exchanger, bypass valve, heat sink, and cooling water circulating pump model are taking into account. System model, and the relationship between stack current, coolant flow rate, fin surface wind speed, bypass valve opening, and fuel cell temperature are in established in simulation experiments. The paper discusses their effects on system as a whole, air coolers, hydrogen heat exchangers, and the influence of the temperature difference between the inlet and outlet of the radiator. The simulation results can provide guidance and help to design the fuel cell thermal management control system.