Drying plays an important role in the postharvesting process of grain. To ensure the quality of the dried grain and improve the intelligent level in drying process, a digital simulation of corn drying machine system based on a virtual instrument was established for 5HSZ dryer, automatically control the air temperature, and predict the discharging speed of grain and so forth. Finally, an online measurement and automated control software of grain parameters were developed to provide the changes of moisture, temperature, humidity, and germination rate in the process of drying. The study carried out in the actual processing showed that it can meet the requirements of the actual drying operation, effectively control the stability of the grain moisture, and keep the dry food quality.
The invention of the Numerical Control (NC) technology have brought the new revolution of manufacturing since 20th century intermediate stage. Computer Numerical Control (CNC ) technology is the foundation of the modern manufacturing technology, integrating the traditional manufacturing technology, modern control technology and modern optical-electromechanical technology.[1,2]As the core of CNC technology, CNC system is requesting higher precision and higher speed as it develops. So it is necessary to meet the requirements of the machining surface quality and avoid the occurrences of the processing speed decline or even stall, which depends on the good controls of the acceleration and deceleration of the feed shaft [3].This article briefly analyzes some existing strategies of the acceleration and deceleration, then mainly introduces the s-shaped acceleration and deceleration curve method and the trajectory planning strategy of it.
In recent years, with the rapid development of electrified railway, caused the number of AC-DC electric locomotive has a rapid growth. For power systems, electric locomotives as the non-linear loads, the harmonic problems caused by the electric locomotives have been increasingly important and get the widespread attention of the electricity workers. In this paper, we simplify the overall structure and analyze the working principle of the electric locomotive based on the AC-DC electric locomotives. And then the simulation model is established by the PSCAD/EMTDC simulation software to improve the managemant of the harmonic problems. Finally, the correctness and effectiveness of this model can be verified by comparing simulation data with the theoretical data and actual statistics.
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