Identification of bridge dynamic properties from moving vehicle responses presents several practical benefits. However, a problem that arises when working with vehicle responses for indirect bridge health monitoring is that the bridge dynamics may get low-pass filtered by the vehicle suspension dynamics, rendering the identification of higher bridge modes difficult. Instead, the contact-point (CP) response—response at the contact point of the vehicle with the bridge surface—is a superior alternative to the vehicle response for identifying the bridge modal features. In the \(\text {CP}\) response, the vehicle dynamics is suppressed and the higher bridge modes are significantly enhanced, thus making it better suited for modal identification. Extracting the \(\text {CP}\) response from vehicle response is, however, not straightforward for a multiple degrees of freedom (MDoF) vehicle model. In this study, a novel methodology is proposed to extract \(\text {CP}\) acceleration from the measured vehicle acceleration using the knowledge of the \(\text {MDoF}\) vehicle dynamics. The \(\text {CP}\) acceleration is shown to act as a base-excited input to the test vehicle and is extracted via a joint input-state estimation procedure employing a Gaussian process latent force model (GPLFM). Numerical case studies are considered to assess the quality of the \(\text {CP}\) acceleration estimated with the proposed approach. It is found that the proposed method performs well and the extracted \(\text {CP}\) acceleration response is able to reduce the effect of vehicle dynamics and improve the prominence of higher bridge modes.

从行驶中的车辆响应中识别桥梁动力特性具有许多实际好处。但是，在使用车辆响应进行间接桥梁健康状况监控时出现的问题是，桥梁动力学可能会因车辆悬架动力学而被低通滤波，从而难以识别更高的桥梁模式。取而代之的是，接触点（CP）响应（在车辆与桥梁表面的接触点处的响应）是用于识别桥梁模态特征的车辆响应的替代方案。在\（\ text {CP} \） 响应中，车辆动力学得到抑制，较高的桥梁模式得到了显着增强，因此使其更适合于模式识别。提取\（\ text {CP} \） 但是，对于多自由度（MDoF）车辆模型来说，来自车辆响应的响应并不是简单的。在这项研究中，一种新颖的方法，提出了提取物\（\ {文本CP} \） 加速度从使用的知识所测量的车辆加速度\（\ {文本多自由度} \） 车辆动态。的\（\ {文本CP} \） 的加速显示充当碱激输入到测试车辆和经由采用高斯过程潜力模型（GPLFM）的联合输入状态估计过程被提取。考虑了数字案例研究，以评估 用所提出的方法估算的\（\ text {CP} \）加速度的质量。发现所提方法性能良好，提取的\（\ text {CP} \） 加速响应能够减少车辆动力学的影响，并提高较高桥梁模式的突出性。