This paper focuses on a novel boundary control design for motion synchronization of a two-slider system. In this system, two sliders are constrained by a flexible beam. The de-synchronization of two sliders will result in the interaction between them. The interaction force is considered as shear force in this paper. Based on the shear force coupling, the system models are derived. In order to obtain an accurate representation, the flexible beam is derived as a distributed parameter system with one partial differential equation. Based on the proposed models, a Lyapunov approach is used to design the boundary control laws for two sliders to realize the synchronization motion. Simulations are provided to illustrated that the proposed method can effectively improve the sync motion performance compared with the cross-coupling method.
A hand-held terminal for orchard information collection is designed, which can identify and realize individual plant precision management based on RFID technology. The equipment adopt RS-485 serial bus and MODBUS communication protocol as the general interface for different sensors, to achieve data acquisition requirements including the fruit tree image, air temperature and humidity, soil moisture etc. Meanwhile, build the cloud database that use SIM900A wireless communication module for real-time upload of data, and it can generate nephogram and data analysis report through GPS positioning. Field test results showed that the terminal has high detection accuracy with worked stably and simple operation. Finally, it realized the sharing of sensor information and automatic data acquisition in orchard, with great application and promotion value.
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