On the fine balance with displacement sensor

1994年的研究主要涉及以下两个方面：1)铰链尺寸误差对质量和动刚度的影响；2)高灵敏度测位式天平的影响。在高54 mm、宽62 mm、厚8 mm的原型天平上，反复进行了尺寸误差对质量影响的实验研究：(1)为了提高动刚度，约有3/8的厚度尺寸误差对被测质量有贡献；(2)必须使加强板和工作台的铰链变硬，减轻质量。高灵敏度测位式天平，高灵敏度精密天平由高50 mm、厚12 mm、宽50 mm的5块铝制平板组成。为了设计出高灵敏度的天平，所有的天平都串联在一起。本研究明确的事实是：(1)无论加载位置如何，理想点的位移保持理想不变。然而，实际的位移会随着加载位置的不同而变化，导致被测质量的误差。(2)有关天平过于僵硬，无法达到预期的万分之一的精度。需要进一步提高灵敏度。(3)由于扭转薄弱，需要对天平进行修改。

The study conducted in 1994 is concerned with the following two subjects,1) The effect of the dimensional error of the hinge on the mass and the dynamic rigidity2) On the displacement detecting type balance with high sensitivity1. The effect of the dimensinal error of the hinge on the mass and the dynamic rigidityThe experiments are repeatedly done on the effect of the dimensional error on the mass, using a prototype balance with dimensions of 54 high, 62 wide and 8mm thick.(1) The fact that around 3/8 of the dimensional error in thickness contributes to the mass to be measured is confirmed in order to highten the dynamic rigidity.(2) It necessities to make hinge stiff and reduce mass of reinforceing plate and the stage.2. On the displacement detectig type balance with high sensitivity.The manufactured fine balance with high sensitivity consists of 5 flat plates (dimensions : 50mm high, 12 thick and 50 wide) made of aluminum. In order to design a balance with high sensitivity, all the plates are combined in series. The facts made clear in this study are ;(1) The displacement at the ideal point remains ideally unchanged regardless of the loading position. The actual displacement, however, changes in according with the location of loading, leading to the error of the mass to be measured.(2) The balance concerned is too stiff to achieve the expected accuracy of 1/10,000. It is required to improve further more the sensitivity(3) The balance necessities to be modified because of the torsional weakness.