The Design Of Weighing Instruments Based On Bending Plate

With the rapid development of road transport industry, domestic and foreigndynamic weighing technologylevel is rising,traditionaldynamic vehiclehasbeenunable to meet the current needs of the industry. In order to solve problems whichthe traditional dynamic vehicle exposed, such as bending plate dynamic weighingsystem emerged. Plate bending dynamic weighing system, with its integralweighing platform, good sealing, simple construction, maintenance-free, etc., isapplicable to a wide vehicle speed range (0~200km/h) WIM. Nowadays, thetechnology of bending plate dynamic weighing system is developing rapidly andbecoming more mature, and has gradually become a new solution for the highwaytoll systemweight and road overrun detection systemdevelopment. Currently, thebending plate has already been used for dynamic vehicle weight fees systems,roads overrun detection system, high and low pre-screening systems, ports,bridges and other traffic load, where traffic is heavy.As the core of calculate and control of the bending plate dynamic weighingsystem, the functionality and performance of electronic weighing instruments,directly determines the skill level of dynamic weighing system. Aiming at high-speed dynamic weighing system, the paper proposed the design of instrument.Thedesign ofinstrumentincludeshardwaredesign,softwaredesign andweighingalgorithm design.And the design ideas and the main contents are as follows:First, the paper discusses the background and significance of dynamicbending plate weighing system and bending plate dynamic weighing instruments, introduces the research situation, development status and future trends in relatedfields at home and abroad, as well as detailing the bending plate in dynamicweighing range of applications and abroad.Second, the paper discusses the composition of bending plate structuredynamic weighing system, including bending plate weighing sensors, vehicleseparation devices and instruments, which focuses on the working principle ofbending plate load sensor. Analysis describes the working principle andworkflows of bending plate weighing systems.Third, based on the analysis of design requirements of the dynamic bendingplate weighing instrument, there are the design of the integrity of the instrumenthardware and the electrical modular design in the paper. And there are designrequirements, the design process and the design results of each hardware module.Fourth, the paper use multi-threaded programming techniques to develop theprocedures of dynamic bending plate weighing instrument. And it discusses indetail the various threads constitute the main program module and its code.Fifth, with analysis of high-speed weighing signal, the paper choose to usethe wavelet transform algorithm for digital signal processing small data signal.Wavelet transformtoolbox in MATLABenvironment forthereduction processingand analysis of original weighed signal noise, achieved good results. Finally, ituse field experimental data to test and verify that this approach indeed improvesweighing accuracy, and it has practical application significance.Sixth, the paper summarize the design process of bending plate dynamicweighing instruments, inadequate analysis and future prospects.The main innovation of this paper is as follows:First, because the system is suitable for high-speed dynamic vehicleweighing, when the vehicle speed through the instrument weighing data signal issmall data signal. In digital signal processing, signal analysis and processing ofsmall data signal, combined with field test data, achieved better filtering effect.Second, in the process of instrument’s software design, it use multithreading programming techniques to improve the operational efficiency and performanceof the instrument.The design of the program structure of the software and hardware of theinstrument has been used in the actual project in Shanxi Province, more than onecounty road pretest station is operating normally and stable performance.Weighing using wavelet transform algorithm can effectively filter out the noisesignal, with the speed of vehicle within the range of0~50km/h, the error ofresults can be controlled within4%.