In this study, the structure and working principles of an eddy current retarder acting as an auxiliary brake set is introduced in detail. Based on the principle of energy conservation, a mathematical model was developed to design a retarder whose nominal brake torque is 1, 900 N·m. According to the characteristics of the eddy current retarder, an exclusive test bed was developed and used for brake performance measurements. The main technical parameters, such as the brake characteristics, temperature characteristics and power consumption, were measured with the test bed. The test data show that the brake torque of the eddy current retarder obviously decreased in the continuous braking stage and that there is a certain amount of brake torque in the normal driving state because of the remnant magnetism of the rotor plate. The mathematical model could be used to design an eddy current retarder. The exclusive test bed could be used for optimization of an eddy current retarder as well as for R&D of a series of products.

Globally 2 degree target by 2100 was confirmed in the international negotiation process in recent years. The remained question is whether this target is feasible or not by thinking slow progress in last decades even though Kyoto Protocol set up targets by 2010. The IPCC called research teams on modeling to analyze the possible pathway, policies options, and cost benefit analysis for GHG mitigation. China’s CO2emission from energy and cement process already accounts for nearly 24% of global emission, and the trend is expected to keep increasing. The role of China in the global GHG mitigation is crucial. This paper presents the scenario analysis for China’s Energy System in the background of global 2 degree target, and discussed the feasibility for the lower CO2emission scenario in China. The finding says it is possible for China to limit CO2emission, reach emission peak before 2025, which make the global 2 degree target feasible, in Which energy system development is a kry . And recent progress of key technologies, availability for further investment on low carbon, policy implementation make it much big possibility for China to go to low carbon emission development pathway.

According to structure of disk MRF brake computational model of inner flow field for MRF was set up at simplified condition when MRF was regarded as Bingham model. Velocity distribution in inner flow field had been analyzed at different brake velocities and magnetic intensity using finite volume method (FVM), and brake torque and power had also been received at the same condition by integral method. Numerical analysis data were compared with theoretical data. Result showed that velocity distribution of inner flow field was not linear at axial direction, and that brake torque of disk MRF brake was constant approximately, and that numerical data and theoretic data were identical and it can provide reference for design.

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