高g值加速度传感器校准数值模拟

Numerical simulation on high g accelerometers calibration

摘要:

通过传感器动态校准理论分析，给出对不同谐振频率的加速度计动态校准时所允许的最大脉冲宽度以及脉冲宽度与传感器谐振频率之间的关系式。在有限元分析软件ABAQUS中建立霍普金森杆数值模型，产生窄脉冲，并提出了一种产生且复现脉宽在10 μs以下的窄脉冲信号的方法。分析了子弹的不同撞击速度、不同端部形状等因素对数值模拟结果的影响。对988压电式加速度计进行频率特性分析，发现数值模拟结果与实际实验结果十分接近，验证了所建立方法的有效性。

Abstract:

The maximum allowable pulse width of accelerometer with different resonance frequencies is studied as well as the relationship between the pulse width and the resonant frequency of accelerometers based on the sensor dynamic calibration theoretical analysis. Finite element analysis software ABAQUS is employed to create a numerical model of Hopkinson bar to generate narrow pulses. Furthermore, a method producing a narrow and reproducible pulse signal is built. The numerical model can produce a pulse width below 10 μs. Besides, the influence of different factors such as the bullet head shapes and different striking speeds on the numerical simulation results are analyzed. The frequency characteristics analysis is performed on 988 piezoelectric accelerometers, and it indicates that the numerical simulation results and the actual experiment results are very close, which has verified the feasibility of the proposed approach.