柱形测压铜柱的静态特性分析

为了提高铜柱测压的精度，对广泛应用于兵器膛压测量的柱形铜柱静态变形规律进行了研究。在合理假设基础上建立了柱形铜柱静态变形的数学模型，并根据大量的铜柱静态校准数据对模型参数进行了估计。根据此模型进行的仿真计算结果与实验数据能很好地吻合，具有对不同规格铜柱的广泛适用性，能可靠地估算铜柱的静态变形规律。依据该数学模型，对铜柱测压灵敏度随变形量变化的规律和加工尺寸偏差对测压精度的影响两方面进行了计算和分析。结果表明：当铜柱压后高度为原始高度的73%时，铜柱的测压灵敏度最高；铜柱及工作活塞的几何尺寸误差是影响测量不确定度的主要因素，通过提高铜柱的加工精度可以明显提高铜柱测压精度。

Static Characteristics of Copper Cylinders for Chamber Pressure Measurement

Copper cylinders as a sensing element of crusher gauges are widely used for measuring the peak pressure in weapon chamber.In order to improve the measuring accuracy,a new mathematic model is proposed to investigate the static deformation of copper cylinders.The model parameters are estimated based on calibrated data.The calculated results are in good agreement with the experimental results.This model can be well applied to estimate the static deformation law of copper cylinders,and has wide applicability to different specifications of copper cylinders.According to the mathematical model,the variation of copper cylinder pressure sensitivity with deformation and the influence of machining dimension deviation on the accuracy of pressure measuring are calculated.When the height of copper cylinder after compression is 73％ of its original one,the pressure sensitivity of the copper cylinder is the highest.The geometric dimension tolerances of copper cylinder and piston are the main factors which affect the pressure measurement uncertainty.The pressure measuring precision of copper cylinders can be improved by improving the machining precision obviously.