Abstract In Coriolis meter terminology, zero-shift is a general term describing the change in time-lag at zero-flow (zero-point) in response to any of a number of external factors. Zero-shift of a straight single-tube Coriolis meter has been investigated experimentally. The meter-tube was stainless-steel (2.66/2 x 300 mm) and has been tested across a range of flow rates (0 – 1 lpm, R e d 1 0 4 ), pressures (1 – 4 barg) and pretensions (0 & 22 N). Zero-shift was shown to be principally dependent on the vibration-frequency. This was confirmed by operating the meter in both free and force-vibration modes. For zero-point to become a function of frequency the system must possess asymmetry, which may arise from the fluid or solid component. It was hypothesized that an asymmetric deformation field (i.e. a deviation from straightness) was the principal source of system asymmetry in this particular case. The deformation field was shown to be dynamic and therefore capable of modifying the zero-point even in fixed-frequency operation. The relationship between zero-point and frequency is complex owing to the many interconnected factors which can create asymmetry. However, it was shown that sensitivity of zero-point to frequency depends on the degree of asymmetry and particularly asymmetry of deformation-gradient ( w 0 ′ ).

中文翻译：

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直管科里奥利计零偏的实验研究

摘要 在科里奥利仪表的术语中，零偏移是一个通用术语，描述响应于许多外部因素中的任何一个的零流量（零点）时滞的变化。已经通过实验研究了直单管科里奥利仪表的零位移。计量管为不锈钢 (2.66/2 x 300 mm)，并已在一系列流速（0 – 1 lpm，R ed 1 0 4 ）、压力（1 – 4 barg）和预紧力（0 & 22 N)。零偏移被证明主要取决于振动频率。这通过在自由和力振动模式下操作仪表得到证实。为了使零点成为频率的函数，系统必须具有不对称性，这可能是由流体或固体成分引起的。假设不对称变形场（即 在这种特殊情况下，偏离直线度是系统不对称的主要来源。变形场被证明是动态的，因此即使在固定频率操作中也能够修改零点。由于许多相互关联的因素会造成不对称，因此零点和频率之间的关系很复杂。然而，结果表明，零点对频率的敏感性取决于不对称程度，尤其是变形梯度 (w 0 ' ) 的不对称程度。