Study On Parallel Data Acquisition System Of F6 Load-testing Vehicle

Traction character is one of the most important targets of vehicle and terrain- machine. It is of great necessity that using special vehicle to supply the load and control relevant, for the sake of testing traction character and working capability under different traction of vehicle and soil engaging components.With the development of technology, the disadvantages of the acquisition system of load-testing vehicle that used to testing traction capability developed by the experts in all of the world since 1980's. For example:F6 load-testing vehicle could only display one of the parameters of traction, velocity, consumption of oil and rotate speed of driving wheel. Neither could the F6 load-testing vehicle display all the parameters synchronously nor surveillance process of the experiment. And the F6 load-testing vehicle could just find out the maximum power by experience. This thesis is based on the survey of the data acquisition system of F6 load-testing vehicle in the key laboratory for terrain-machine bionics engineering, ministry of education, china, studied reference to the data acquisition system of load-testing vehicle in and out abroad, with the development of modern instrument, exploited a parallel data acquisition system with the thought of cost optimizing.This thesis analyzes the relations of each parameter, explains the mathematic model, and brings forward the idea of exploitation system with the knowledge of kinematics, dynamics, signal analyzing and processing. It is including that analysis of force and the traction balanced equation while wheeled tractor with load testing vehicle is varying velocity on the road, analysis of force and the traction balanced equation of tested vehicle, the force balanced equation of load-testing vehicle on the traction direction, the sampling frequency ascertaining, spectrum analyze and the FFT transform.The parallel system is composed of sensors, signal modulating device, collecting cards and a notebook PC. Survey the traction, the velocity, rotate speed of the motor, the rotate speed of driving wheel and consumption of oil. It transforms every non-electronic physical quantity such as traction, velocity, rotate speed of the engine, rotate speed of driving wheel and fuel consumption into the electronic signals which have a corresponding relation with them by sensors, collected signals enter single modulating device and collecting cards, finally come into notebook PC for calculating and processing. Considering the need of capability parameters and basic theories of deciding parts of apparatus and keeping the original measurement parts, the daqbook/120 and 5B module of the virtual apparatus in our laboratory were chosen.DASYLab was selected as the exploiting platform, the software system was disassembled into several function modules according to the principle of from top to the bottom, subdivide stepwise. Actualize the software of parallel data acquisition system according to the signal and working flow chart. An indoor simulate test-bed was established based on AT89C51 simulate output signal, considering the cost of time, manpower and material resources. The developing period was reduced and cost was saved when modulating the system.The interference of the system was researched, the inside and outside interference of the system was analyzed, and the main interference and the way how it transmits were found out. The collected signals of the moving machine were made spectrum analysis. A satisfying result was achieved by means of using UPS electrical source, isolating technical and choosing suitable frequency of the filter.Comparing the former system with the parallel system, it is demonstrated obviously by analyzing the data in stable state of the third gear level chosen randomly that the developed system attained the precision of collecting the parameters. The curves showed traction character approximately, which modified the disadvantage that can not display and save the processing data of the original system. Add the function of doing unstable state e...