The determination of the local acceleration of gravity at the mass position is an important aspect of the joule balance. Since a simultaneous measurement of the absolute gravity at the mass position with the joule balance in place is impossible, seven gravity reference sites are chosen in the joule balance laboratory. Absolute and relative gravity measurements at the reference sites were performed between 2015 and 2019, and varioust transfer methods were used to obtain an absolute gravity value at the mass position. The self-attraction effects of joule balance apparatus are corrected by FEA simulation, and calculation accuracy is also verified by experiment. To obtain real-time local gravitational acceleration values during the joule balance experiment, geophysical effects, such as atmospheric pressure, Earth tides, and polar motion are considered. The absolute gravity results exhibit good stability from 2015 to 2019, and the final gravitational uncertainty contribution in the j...

中文翻译：

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NIM焦耳平衡中重力加速度的确定

确定质量位置处的局部重力加速度是焦耳平衡的重要方面。由于不可能在焦耳平衡到位的情况下同时测量质量位置的绝对重力，因此在焦耳平衡实验室中选择了七个重力参考点。在2015年至2019年之间进行了参考地点的绝对和相对重力测量，并使用了多种传递方法来获得质量位置的绝对重力值。焦耳平衡仪的自吸效应通过有限元分析进行校正，并通过实验验证了计算精度。为了在焦耳平衡实验期间获得实时的本地重力加速度值，考虑了地球物理效应，例如大气压力，地球潮汐和极运动。