主轴径向跳动数字化测量仪表的设计（英文）

Design of digital instrument for spindle radial pulsation

为了解决指针式仪表在主轴径向跳动测量中无法提供标准电流信号的困难,提出在传统的机械测量机构嵌入一个滑动可变的精密电阻,通过电桥回路将电阻变化量转换成电压信号,利用运算放大器对其电阻值进行线性化处理,从而形成符合国际标准的接口信号,由此建立一个由基础测量、数据处理和实时监控组成的三层网络系统。该网络的功能旨在实现远程数据采集、信号传输、数值计算、图像处理等。将新设计的仪表与标准光栅进行数据比对实验显示,采用特殊修刻工艺制作的可变电阻输出值与线性机械位移量之间可以呈现严格的对应关系,从而为该仪器的实验室研究走向与再制造有关的实际应用奠定基础。研究结果表明:与传统方法相比,新方法更加注重采集大量的数据,形成合适的样本集合并建立对应的数学模型。通过构造的曲线与观测点的拟合情况来进一步优化模型,并对今后的变化趋势进行预测,这样可以检测出隐匿很深的内部缺陷,从而为指导维修工作提供有价值的参考信息。

The thermodynamic design and calculation were carried out to a certain reciprocating compressor under the variable condition requirements; the comprehensive piston force curves were drawn and the maximum stress position of the crankshaft were obtained under two operating conditions by meshing the crankshaft and introducing its crankshaft model into ANSYS Workbench software; moreover, the stress distribu- tion, deformation and static strength of the crankshaft were analyzed. The results indicate that the compressor may conform to the design requirements under changing operating conditions and the static strength of the crankshaft may meet the operating requirements; at the same time, a certain basis may be provided to the thermodynamic de- sign and crankshaft strength analysis of the same type compressors.