Study On Four Sets Of Virtual Instruments For Testing Properties Of Agricultural-Machine Components

Study on Four Sets of Virtual Instruments for Testing Properties of Agricultural-Machine ComponentsDuring the research of agricultural engineering's experiment, it is necessary to collect and analyze data being relative to all sorts of experiment either for the purpose of analyzing the mechanism of reducing adhesion and resistance of the agricultural machine and exploring its discipline, or for the purpose of researching reducing resistance and desorption of the walking and working device of ground machines. On the other hand, as the developing and applying of electronic technologies, the agricultural engineering's experiment is more and more strict with measurement precision of experiment's data. As a result, the more and more requirements of measurement instrument quality are needed. In order to get satisfying experiment results and low the cost of experiment, the research and the exploring of the virtual instrument will be developed into a new method of improving the agricultural engineering's experiment.The virtual instrument has already not as strange as it was used to be, since it was presented by the IN company in 1986. The appearance of the virtual instrument was a challenge to the traditional instrument and a technologic creation in the field of measurement, as well as a new trend of this field. Although many active researches have been done about the virtual instrument in our and some other country, in China there are still many questions, such as the lack of Chinese material, the instability, the application still limited, and so on. All of these have already been obstacles to researching it deeply and deploring the method to be used widely.In this article, the author reviewed the domestic and overseas early research on virtual instruments. In order to satisfy needs of the agricultural engineering experiment considering hardwires of his laboratory and taking advantage of the configuration software DASYLab and the software DAQView, the author finally designed four virtual instruments with the lower price and occupying smaller room: the 16 channels stress-strain fast virtual test instrument, the many channels voltage signal virtual test instrument, the multi-function of stress and temperature virtual test instrument, the single channel stress-strain virtual test instrument, furthermore, the author made use of these virtual instruments into many experiments, such as, bulldozing experiments of model blade, the experiment to reduce adhesion and resistance of the bionic plow, the experiment to reduce adhesion and resistance of the bionic ditcher, etc, to verify these virtual instruments' feasibility and the advantages compared with the traditional ones, trying to provide the better research method of the agricultural engineering experiment.The virtual instruments, which are researched in this paper, made up of the notebook PC, the system of data collection, and the configuration software DASYLab or the software DAQView, etc. During the process of exploitation of the software system of the virtual instruments in the paper, the author took full advantage of the transform module of the A/D of the DASYLab; the module of Dig. meter, Analog, Y/t, Recorder, Message, etc; the module of Action, Time Base, Switch, Select, FFT,Filter,etc and choosing and linking those modules reasonably. The virtual instruments designed in the paper can fulfill the demand of the experiment, as well as have the friendly interface. The experimenters can use them at will.In the side of the expanding of function, to accord with the different conditions of experiments these Virtual Instruments only need be changed the parameters of the relevant function modules; to accord with the different input these Virtual Instruments only need to be changed those transform signals modules of their hardwires and corresponding parameters of these modules.Through the testing of function and the experiments, a conclusion about the four Virtual Instruments developed in this paper can be presented: compared with the traditional test...