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This paper aims to study the effect of the secondary lateral stopper on the compressed stability of the couplers in order to improve the running safety of the heavy-haul locomotives. The influence mechanism of the secondary lateral stopper on the compressed stability of the couplers is theoretically analyzed. To verify the effect of the secondary lateral stopper, both the simulation and the field braking tests are conducted. The multi-body dynamic model consists of two eight-axle locomotives, one dummy of freight vehicle and four detailed connected couplers. The field braking tests are conducted on the tangent line using three eight-axle locomotives. The results indicate that decreasing the free clearance and increasing the stiffness of the secondary lateral stopper both have a positive effect. However, when the free clearance decreases from 20 mm to 10 mm, there is no remarkable decrease in the yaw angles of the coupler and the car body, and the maximum lateral force of the wheelset is still out of the standard in the simulation. When the stiffness of the secondary lateral stopper increases by five times, the yaw angles of the coupler and the car body are reduced significantly and the running safety of the locomotives is also enhanced.

In this paper, the problem of the low pass filter is difficult to achieve the response speed and the accuracy balance of the test based on the ip – iq traditional harmonic current detection algorithm based on the instantaneous reactive power theory, and the method of improving the method of the low pass filter based on Sa-function characteristics is proposed. Then, according to the model, the filter is optimized by combining the ratio integral. Finally, the simulation is carried out. The simulation results show that the low pass filter based on the Sa-function characteristics can improve the real-time and accuracy of the harmonic detection.

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