【摘要】 从理论上分析了静重式力标准机加载过程的砝码倒换的力学原理。得出力值控制精度和速度取决于执行装置的控制性能的结论。据此建立了控制模型,研究了其中的控制问题,并进行了倒码实验。结果表明,对砝码倒换的力学原理的理论分析和基于此的控制模型是正确、有效的,利用该模型控制倒码造成的力值波动不大于2%。更多还原

【Abstract】 Using the loading method by the weight rearrangement in the dead weight force standard machine may lead to reducing the weight quantity,broadening the measure range,and minimizing the machine size.However,the weight rearrangement process should not result in the precision deterioration during machine calibration and force measurement.It is requested that the force fluctuation during the weight rearrangement process should not be too strong.The mechanical principle of the weight rearrangement during the loading process in the studied machine was analyzed and the results show that the force value control precision and speed depend upon the control performance of the actuator of the machine.Based on these results a control model was established and the weight rearrangement experiment was performed.The results show that the theoretical analysis of the weight rearrangement process and its control model are correct and effective,leading to the force value fluctuation during weight rearrangement less than 2%.更多还原