Applied Researches Of VI Techniques On Multi-Purpose Test-bed Of Precision Seeder

Performance test of precision seeder is an important component of farm machine test; also, it is a necessary part in developing and designing new type precision seeder. This research follows "Research of a New Type Multi-purpose Seeder Test-bed", which is one of the fundamental construction items originated by Agriculture and Farm Mechanization Lab belonging to Shandong Wheat Engineering Center. Based on previous achievement, this research develops some applied researches on precision seeder test-bed by using the advanced VI(virtual instrument)techniques, and has built a CAT (Computer Aided Testing)system of multi-purpose precision seeder test-bed based on the VI techniques.VI is a completely new concept of instrument. It has taken on a prosperous outlook in modern test field. This research has built two different test systems by using VI techniques. One is a velocity test system based on digital signal processing techniques; the other is a kind of computer vision system based on digital image processing techniques. Under the environment of Visual Basic6.0, using Measurement Studio6.0 and its add-on tool IMAQ Vision6.0, designed the data and image acquisition and process programs.This research includes four parts. In the first part, a signal test system based on the VI has been built; a walking speed testing module for the test-bed has been programmed; and a kind of velocitytesting instrument has been developed, which has higher test precision and error less than 1%. The second part has analyzed building principles of image acquisition and processing system, and introduced basic image processing techniques; a method of processing image in VB has been found; basic image processing programming has been realized, and the "Image Processing VB Program" software has been developed. The third part has built an image acquisition system based on VI techniques and developed a test system to automatically detect the seeds' interval information on the ground by using digital image processing, which can compute standard seeding interval exponent, leak seeding interval exponent, repeat seeding interval exponent, variance coefficient etc, and has a higher measuring precision. The last part has realized to test the location of falling seeds according to above research and made an elementary discuss about the process of seeds falling. Each part of the system runs normally, and has a friendly interface. The data and image acquisition and processing system run good, and the result is preciseness.In conclusion, the application of VI techniques on the precision seeder test-bed has enhanced the automatic and intelligent level of test process, at the same time improved the test efficiency and precision, also shortened the exploitation period.