Wu Bin, Ye Lingyun, Huang Tiantian, Yang Zhaowei, Song Kaichen
College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou 310027, China.
Science and Technology on Special System Simulation Laboratory, Beijing Simulation Center, Beijing 100854, China.
Sensors (Basel). 2019 Jul 15;19(14):3123. doi: 10.3390/s19143123.
Dead time estimation is important in the design process of quartz flexure accelerometers. However, to the authors' knowledge, the dead time existing in quartz flexure accelerometers is not well investigated in conventional identification studies. In this paper, the dead time, together with the open-loop transfer function of quartz flexure accelerometers, is identified from step excitation experiments using two steps. Firstly, a monotonicity number was proposed to estimate the dead time. Analysis showed that the monotonicity number was robust enough to measurement noise and sensitive to step excitation. Secondly, parameters of the open-loop transfer function were identified using the least mean squares algorithm. A simulation example was applied to demonstrate the validity of the proposed method. The verified method was used to test a quartz flexure accelerometer. The experimental result shows that the dead time was 500 μs.
死区时间估计在石英挠性加速度计的设计过程中很重要。然而，据作者所知，传统识别研究中对石英挠性加速度计中存在的死区时间研究并不充分。本文通过两步阶跃激励实验，对石英挠性加速度计的死区时间及其开环传递函数进行了识别。首先，提出了一个单调性数来估计死区时间。分析表明，该单调性数对测量噪声具有足够的鲁棒性，并且对阶跃激励敏感。其次，使用最小均方算法识别开环传递函数的参数。通过一个仿真例子验证了所提方法的有效性。将该验证方法用于测试一个石英挠性加速度计。实验结果表明，死区时间为500微秒。
