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寻求一种使装载机在工作过程中完成对货物称量的方式具有重要意义。介绍了一种由动臂角位移、动臂角加速度及相应位置举升缸压力值来计算铲斗中货物重量的装载机动态称重系统,动臂角位移及举升缸有、无杆腔压力信号由单片机控制采集,在数学模型上充分考虑到动臂角加速度ε的影响。研究了运用EMD算法(empirical mode decomposition,经验模态分解法)对含噪压力信号进行处理以提高压力信号采样有效性的方法。详述了EMD方法及其算法,为装载机动态称重及动态称重中数据的处理提供了一种有效方法。以ZL50F作为样机,从试验验结果可以看出在载重较小和接近额定载重的工况下相对误差较大,中间段相对误差较小,但都在±3%以内。因此,用于控制铁路货运超载、大型工地实现物料的合理分配与调度等不需非常精确称重的领域是可以满足要求的。
It is of great importance to seek a way to make the loader complete the weighing of the goods during the working process. A dynamic weighing system of loader based on boom angle, boom acceleration and corresponding cylinder pressure is introduced to calculate the weight of the cargo in the bucket. The boom angle displacement and lift cylinder are equipped with rodless chamber The pressure signal is collected by the single-chip microcomputer, and the influence of the boom angle acceleration ε is fully taken into account in the mathematical model. The method of using EMD (empirical mode decomposition) to process the noisy pressure signal to improve the sampling effectiveness of the pressure signal was studied. The EMD method and its algorithm are described in detail, which provides an effective method for the data processing in the dynamic weighing and dynamic weighing of the loader. Taking ZL50F as a prototype, it can be seen from the test results that the relative error is small under relatively small load and close to the rated load, and the relative error in the middle section is small but within ± 3%. Therefore, the fields that do not need to be accurately weighed, such as overloading of railway freight transport and reasonable distribution and dispatching of materials in large sites, can meet the requirements.