基于ARM的輪式裝載機(jī)稱重系統(tǒng)
[Abstract]:In order to improve the loading efficiency of wheel loaders and shorten the transportation time of materials, the hardware platform and software system with high performance and high precision must be used to design and realize the weighing system of wheel loaders, which can adapt to the complicated vehicle environment. To ensure the accuracy of weighing and the stability of the system in short-term trading, so as to improve the circulation speed of goods and reduce the amount of manpower, material and financial resources taken up in the circulation of goods. Based on the above background, high-performance, low-power embedded ARM processor AT91SAM9261 and preemptive real-time multitasking operating system 渭 C OS I are used in wheel loader weighing system. In order to ensure the sampling accuracy, the 24-bit AD sampling chip ADS1256 is selected to collect the hydraulic data. In combination with the functional requirements of the system in practical application, the system development cost and time factors, in the hardware design, the use of the core board and the bottom plate separate design scheme. The system program is divided into three modules: device driver module, functional application module and system API module. A large number of noise signals in the original data are obtained by AD sampling. In order to minimize the influence of symmetric weight results of vehicle noise signals, the FFT variation is used to analyze the original signals. The low pass filter is used to filter the noise signal from the original signal. Finally, the least square method is used to complete the conversion relationship between the hydraulic data and the actual weight of the cargo. It is proved by practice that the weighing accuracy of the system reaches 0.5% and the confidence interval is 95% when the wheel loader is in static state. The weighing accuracy of the system is up to 1% and the confidence interval is 95% when the loader is in the course of moving (velocity 5~10km/h) or on the slope ground (the front and back inclination angle is less than 10 擄, the left and right inclination angle is less than 5 擄). In line with the actual use of precision requirements.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:TH243
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