Relative indentation is the input signal estimating contact force model parameters, so the signal is required to have a higher precision to ensure the accuracy of the estimated contact force model parameters. However, in the impact experiment, the vibration displacements in multiple directions are often coupled in the relative indentation, resulting in a large error of the measured relative indentation. This paper presents an experimental correction method for the relative indentation. Firstly, the relative indentation is decoupled by the established model of the spatial position of the hammerhead relative to the sample to reduce the errors caused by the rotation of the pendulum boom and the vibration of the base. A pendulum impact test device is established to verify the correction method of relative indentation. The results show that the maximum relative error between the contact force estimated by using the corrected relative indentation as the input signal and the measured contact force is less than 3%. The estimated contact force is in good agreement with the measured value, and the correlation coefficient is above 0.92. It shows that the experimental correction of the relative indentation has achieved good results, which verifies the accuracy of the correction method.

相对压痕是估计接触力模型参数的输入信号，因此要求信号具有更高的精度，以确保估计的接触力模型参数的准确性。然而，在冲击实验中，在多个方向上的振动位移通常被耦合在相对压痕中，从而导致所测量的相对压痕的误差较大。本文提出了一种相对压痕的实验校正方法。首先，相对压痕通过锤头相对于样品的空间位置的已建立模型解耦，以减少由摆杆旋转和基座振动引起的误差。建立摆锤冲击试验装置，以验证相对压痕的校正方法。结果表明，使用校正后的相对压痕作为输入信号估计的接触力与测得的接触力之间的最大相对误差小于3％。推定的接触力与实测值吻合良好，相关系数在0.92以上。结果表明，相对压痕的实验校正取得了良好的效果，验证了校正方法的准确性。