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一、水平摆系对张丝的基本要求 水平摆系做为获取地球固体潮汐,地壳微量倾斜变化的相对数值,已被广泛地应用到地学科学研究之中。为了地震予报科学的监测和研究,水平摆系需要长期,连续地记录到地壳缓慢的地倾斜微小变化量。其灵敏度要求能够清晰地反映出日月组合的引力对地壳能够产生的最大振幅为0.″02角秒的变化量。(即:垂线偏差量)。也就是说,要求水平摆系能够分辨出10~(-8)弧度的角位移量,并且要求长期稳定。为此,对水平摆系的要求是非常严格的。 水平摆系运动的简单表达式可写成:
First, the level of the Department of the basic requirements of Zhang silk horizontal pendulum as the acquisition of the Earth’s solid tides, the crustal micro-tilt changes in the relative value has been widely applied to the geosciences. In order to monitor and study the earthquakes, the horizontal pendulum needs long-term and continuous records of small changes of the earth’s slow ground inclination. The sensitivity requirement clearly shows that the maximum amplitude of the Earth’s crust that can be produced by the gravitational pull of the sun-moon combination is 0. "The amount of change in 02 arc seconds (ie, the amount of vertical deviation.) That is, horizontal pendulums are required to be resolved Out of 10 ~ (-8) radian of the angular displacement, and requires long-term stability.To this end, the requirements of the horizontal pendulum is very strict.Horizontal pendulum movement of the simple expression can be written as: