基于压电力传感器冲击功的检测方法研究

Research on the impact energy detection method based on piezoelectric force sensors

摘要:

液动冲击回转钻探具有防止岩心堵卡、提高勘探效率的重要作用，冲击器冲击功的无损精确检测一直是困扰冲击器研究机构及生产单位的难题。本文利用压电力传感器、电荷放大器将冲击器的冲击力波形转换为电压波形信号，再利用MP4221采集板和基于Visual C++语言研发的实时采集、显示软件将冲击力波形采集到PC机，并实时显示冲击力波形曲线；依据动量定理和冲量定理，通过研究冲击器冲击功与最大冲击力的关系，确定了冲击功与最大冲击力的关系式，即冲击功与最大冲击力的平方成正比。文章通过标定实验台架进行了可行性验证，实验表明，利用压电力传感器可以准确地检测出冲击力波形，结合标定台标定出的“冲击功-冲击力”关系式系数可以准确地计算出对应的冲击功波形。

Abstract:

The impactor is one of the important tools for preventing core blockage and improving exploration drilling efficiency of drilling. The non-destructive and accurate detection of impact energy has been a difficult issue for impactor manufacturers and research institutions. In this study， the impactor impact waveform is successfully converted to the voltage waveform signal by employing the piezoelectric force sensor and the charge amplifier. After that， the signal will be collected and interpreted again by PC through the MP4221 acquisition system and the real-time acquisition and display software based on Visual C++. According to the theorems of momentum and impulse， the specific relationship between impact energy of the impactor and the maximum impact force is built： the impact energy is proportional to the square of the maximum impact force. Besides， the corresponding feasibility is verified by the calibration experiment bench. The experiment shows that the impact force waveform can be accurately detected by using the piezoelectric sensor， and the corresponding impact power waveform can be accurately calculated by the relationship coefficient calibrated by the calibration bench.between impact energy and impact force.