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所谓短圆弧,足指30°以下圆心角所对的圆弧。对短圆弧和短直线的测量一直是测量界关注的问题。在不同测量仪器上的不同测量方法(如弦高法、函数逼近法、优化最小二乘法等)各有特点,也各有其限制条件。对不同的测量对象、测量条件,各有其相应用处。经分析,短圆弧之所以成为难题,就是无论用什么测量仪器、什么方法测量,都必须在被测的短圆弧上取点,会因多种因素产生取点误差。例如,被测短圆弧直径在Φ100mm左右,在一般测量仪器上正常的采点误差假设为0.3mm,这样的结果显然无法接受。经过长期在三坐标中的实际,我找到了合适我院测量对象的简单、方便、又实用的测量方法。以下作简单介绍。
The so-called short arc, foot refers to the central angle of 30 ° below the arc. Measurement of short arcs and short straight lines has always been a concern in the measurement community. Different measuring instruments on different instruments (such as chord height method, function approximation method, optimization of least squares, etc.) have their own characteristics, but also have their own constraints. For different measurement objects, measuring conditions, each has its own corresponding use. After analysis, the reason why the short arc becomes a problem is that no matter what measuring instrument, what method to measure, we must take a short arc on the measured point, due to a variety of factors will take a point error. For example, the measured short arc diameter of about Φ100mm, in the general measuring instrument normal sampling error is assumed to be 0.3mm, this result is obviously unacceptable. After a long period of practice in three coordinates, I found a simple, convenient and practical measurement method suitable for measuring objects in our hospital. The following for a brief introduction.