超长测杆设计方法的探讨

A Study on the Design of Extra-Long Measuring Bars

提出了用预变形方法来补偿测杆因其材料弹性造成的弯曲变形,从而使测杆成为平直状态,确保非接触传感器在管道孔内的采样过程准确、稳定.并分析了测杆在两种负载情况下的谐振(固有)频率,提出了消除外界振动源影响测量工作的思路.研究结果对各类超长测杆的设计具有普遍意义.

A study on the performance of an extra-long measuring bar used for non-contact measurement of inner diameter and geometrical form in a long tube is reported in this paper. A method of pre-bending the measuring bar for compensating its elastic deflection is proposed. Thus, a straight measuring bar can be used to carry a sensor for accurate and steady data acquisition. Secondly, to avoid or reduce the effect of environmental vibration, the natural frequencies of measuring bar with two kinds of loads are analyzed, and a suggestion to reduce that effect is given in this paper. The research results are of universal significance for the design of various extra-long measuring bars.