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目的 分析温度变化对精密压力表检定结果的影响机制,建立系统性温度补偿策略以提高计量检定的准确性。方法 构建高精度温控实验平台(控温范围10℃至50℃,精度±0.3°C),通过分段温度控制(10、20、30、40、50℃)开展全量程正反向加载检定试验,采集多温区示值误差数据;基于非线性回归建立二次多项式温度修正模型,提出分段修正系数计算方法,并利用独立样本验证模型有效性。结果 模型在各温区下拟合决定系数均大于 0.94,修正后各压力点的绝对误差压缩至±0.025 MPa以内,平均误差缩减率达62%,迟滞误差下降超过50%,合成不确定度从0.022 MPa 降低至0.017 MPa。结论 温度变化通过弹性元件热响应与结构变形显著影响压力表检定结果,所提出的多项式修正模型与分段补偿策略可有效降低系统性误差,提升检定结果的一致性与可靠性,具有在多种温控场景下的工程推广价值。
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| 温区 | 量程点 /% | 原始误差 / | 修正后误差 / MPa | 误差缩减率/ % |
| 10 | 100 | 0.032 | 0.019 | 40.6 |
| 30 | 70 | 0.027 | 0.016 | 40.7 |
| 40 | 100 | 0.041 | 0.024 | 41.5 |
| 50 | 100 | 0.043 | 0.026 | 39.5 |
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| 温区 | 量程点 /% | 原始误差 / | 修正后误差 / MPa | 误差缩减率/ % |
| 10 | 100 | 0.032 | 0.019 | 40.6 |
| 30 | 70 | 0.027 | 0.016 | 40.7 |
| 40 | 100 | 0.041 | 0.024 | 41.5 |
| 50 | 100 | 0.043 | 0.026 | 39.5 |
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