计量学报2026，Vol.47Issue(3)：374-379,6.DOI:10.3969/j.issn.1000-1158.2026.03.08
基于低采样AD量化的标准振动台失真度测试方法
Distortion Measurement Method Based on Low Sampling AD Quantization for Standard Vibrator
摘要
Abstract
To accurately analyze the harmonic components in the output excitation signal of the standard vibrator under low-sampling AD quantization and meet the high-precision total harmonic distortion(THD)acquisition requirements in vibration calibration.First,a low-speed sampling module for the vibration data of the standard vibrator's output excitation signal was built using the AD7606 chip.The influence of low-sampling AD quantization on the resulting THD test error of the excitation signal was analyzed experimentally.Second,an error correction method based on a least squares support vector machine(LSSVM)combined with a local outlier factor(LOF)uniform sampling was proposed.The error data caused by low-sampling AD quantization were corrected using the identified error correction model,leading to more accurate extraction of key parameters such as individual harmonics and THD.The final simulation and experimental results show that the LSSVM error correction model identified using the LOF-based uniform sampling strategy achieves higher fitting accuracy compared to conventional error correction methods,and is able to limit the error between the THD analysis results of the low-speed sampling module and the NI data acquisition card to within 0.45%.关键词
力学计量/标准振动台/总谐波失真度/AD采样/最小二乘支持向量机/局部离群因子Key words
mechanical metrology/standard vibrator/total harmonic distortion/AD sampling/least squares support vector machine/local outlier factor分类
通用工业技术引用本文复制引用
张旭飞,魏鑫,曹承乾,王硕,武艺凡..基于低采样AD量化的标准振动台失真度测试方法[J].计量学报,2026,47(3):374-379,6.基金项目
国家自然科学基金(52375544) （52375544）
山西省基础研究计划(202203021211152) （202203021211152）
山西省研究生实践创新项目(2025SJ125) （2025SJ125）
