CAJ | 학술논문

针对石英挠性加速度计自身的机械噪声和电路噪声以及环境噪声对有效信号影响的问题,提出了一种基于广义形态开闭和形态闭开组合的滤波器进行降噪、采用功率谱密度进行加速度计数据分析的方法.设计了加速度计数据采集方案,利用数据采集系统获取了加速度计测试数据,采用广义形态开闭滤波器和闭开滤波器的组合进行加速度计数据的降噪,采用Welch方法进行了数据的功率谱密度计算,计算结果表明降噪后数据的功率谱密度峰值在50 Hz及其奇倍频处明显,功率谱密度的总均方根值表明降噪前后相差3 dB,证明了降噪方法的有效性.
침대석영뇨성가속도계자신적궤계조성화전로조성이급배경조성대유효신호영향적문제,제출료일충기우엄의형태개폐화형태폐개조합적려파기진행강조、채용공솔보밀도진행가속도계수거분석적방법.설계료가속도계수거채집방안,이용수거채집계통획취료가속도계측시수거,채용엄의형태개폐려파기화폐개려파기적조합진행가속도계수거적강조,채용Welch방법진행료수거적공솔보밀도계산,계산결과표명강조후수거적공솔보밀도봉치재50 Hz급기기배빈처명현,공솔보밀도적총균방근치표명강조전후상차3 dB,증명료강조방법적유효성.
To solve the problem that the accelerometer data is affected by the accelerometer’s mechanical noise, circuit noise and ambient noise, a data de-noising method was proposed, in which the morphological filters are combined with opening-closing and closing-opening models to eliminate the noise, and the power spectral density was used to analyze the filtered data. First, an accelerometer data acquisition scheme was designed, and the test data was acquired with the data acquisition system. Secondly the data was filtered by the morphological filter. Thirdly, the power spectral density of the acceleration was calculated by the Welch’s Method. The calculation results show that there are protuberant peak values at 50 Hz and the frequencies that are odd times of 50 Hz. Finally, the root mean square of the acceleration’s power spectral density was calculated. The results demonstrate that the cumulative root mean square of the power spectral density after de-noising is approximately 3 dB less compared with the one without the de-noising process.