In this paper, Using rigid-flexible coupling method the auto synchronous belt drive system dynamics model is established. We can make the rigid-flexible coupling analysis of auto synchronous belt drive system through Recurdyn, designed and auto synchronous belt vibration displacement measurement device was developed, measuring the midpoint of the belt in the process of synchronous belt transmission vibration curve of change over time. Has an important value to improve auto synchronous belt transmission stability and reduce the transmission noise.

Aiming at the ZA type automotive synchronous belt, natural frequency of transverse vibration of automotive synchronous belt is analyzed theoretically by using model of string vibration, and ZA type automotive synchronous belt with belt length 400mm is analyzed by using ANSYS-WORKBENCH software. Solving natural frequency of belt under preload, the results are compared with the theoretical calculation results, and to verify the theoretical calculation results. It provides a basis to design multi-pulley driving system and reduce transverse vibration of synchronous belt in the process of transmission.

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This paper is mainly about the experiment research of oil monitoring for a kind of special heavy vehicle’s transmission system. The wear elements in lubrication oil of a heavy vehicle’s transmission system were analyzed by the spectroscopic analysis method, and gear’s wear status was studied. Probability density function and probability distribution function of wear information about the elements in lubricating oil were calculated by the maximum entropy theory. The running cut-off point is obtained for diagnostic criteria of the vehicle’s failure, which provided evidence for monitoring and judging the reliability of the vehicle’s wear.

The GaInAsSb-AlGaAsSb double quantum well lasers with an emission wavelength around 2.1μm, shown high quantum efficiency and high power conversion efficiency at continuous-wave power output. The threshold current density and the external quantum efficiency of the device were 130mA/cm2and 36.1%, respectively. The 15% maximum power conversion efficiency (PCE) were achieved from laser operating about 2.1μm wavelength.