Data Acquisition And Processing Research In Vehicles Weigh-in-Motion System

The development of communication and transportation industry has undoubtedly played an active role in the construction of national economy. Along with the development of the Highway Transportation, Industrial production and Business Trade, it is required that the Highway Weigh-in-Motion (WIM) systems have more qualification of modernization and Scientific for the rapid automatically and the enforcement of the overloading rule. WIM accuracy is a crucial indicator, data acquisition and processing is a very important part. So we do research on the vehicle WIM data acquisition and processing.Firstly,This thesis acts according to universal characteristic of WIM system, has established the WIM system's mathematical model, mainly to vibrated the reason which, the vibration load form as well as vehicles dynamic axis heavy signal produced questions and so on frequency distribution has carried on the detailed analysis,obtained the influence dynamic weighing precision the factor.Secondly, this article according to the influence dynamic weighing precision the factor, the choice axle load, the speed, the acceleration and so on takes the data which must gather, carries on the whole to the weighing system the design, including:The design whole's dynamic weighing plan, has carried on the arrangement to each weighing module;Design feature gathering system;According to sensor's performance and the weighing precision's need, the choice appropriately weighing the sensor; Design feature pretreatment module.Thirdly, this article has compared the recent data processing methods by the actual example: Two point method of trapezoid, parameter estimation law and artificial neural networks algorithm. Because three BP neural network surpasses other algorithms obviously in the computational accuracy, chooses the three BP networks to take the processing data the method, and uses the MATLAB software to make the data to carry on further simulation. For the enhancement computational accuracy and the running rate, increase the auto-adapted study speed method and the additional momentum method in three BP network algorithm carry on further improve, carries on the comparison to the computed result, after proving the algorithm improvement, the precision and the speed obviously enhance.Finally, weighing system's management software to carry on is designed, the data acquisition module is established, the data processing module, the establishment database module and the inquiry database module, realizes the data demonstration, the soft control platform, the warning demonstration function. And carries on the design to the SQL data bank administration, establishes the friendly man-machine contact surface.