In this paper, the cross coupling effect of the vibration paths in a dummy vehicle is investigated by the conventional transfer path analysis (TPA), the operational path analysis with eXogeneous inputs (OPAX) and the operational transfer path analysis (OTPA). The traditional transfer path analysis (TPA) is developed in the beginning of the 1980s at first. It is widely used as a tool for not only NVH troubleshooting but also estimating the transfer path of vibration and noise. Nowadays the TPA has becomes a powerful tool for the vibration source identification in the automotive engineering. TPA requires a lots of test time to process the full data such as the measured operating data and frequency response function (FRF). Based on these disadvantages of traditional TPA, relatively new approaches have developed such as OTPA and OPAX. The OPAX uses parametric models to characterize the operating load and needs a minimum number of extra tests with excitation. The OTPA has the advantage because it request the only operation data for evaluate the contribution of vibration sources. However, there are three limitations in the usage of the OTPA. The study deals with one of three limitations of the OTPA. It is the influence of the cross coupling between several source inputs. The problem of the cross coupling has been discussed with experiment data and presents the method to solve this influence.

在本文中，通过传统传递路径分析（TPA）、外生输入运行路径分析（OPAX）和运行传递路径分析（OTPA）研究了模拟车辆中振动路径的交叉耦合效应。传统的传输路径分析（TPA）最初是在 80 年代初发展起来的。它不仅被广泛用作 NVH 故障排除的工具，而且还被用作估计振动和噪声的传递路径的工具。如今，TPA已成为汽车工程中振动源识别的有力工具。TPA 需要大量的测试时间来处理完整的数据，例如测量的运行数据和频率响应函数 (FRF)。基于传统 TPA 的这些缺点，出现了相对较新的方法，例如 OTPA 和 OPAX。OPAX 使用参数模型来表征运行负载，并且需要最少数量的额外激励测试。OTPA 的优势在于它需要唯一的运行数据来评估振动源的贡献。但是，OTPA 的使用存在三个限制。该研究涉及 OTPA 的三个限制之一。它是几个源输入之间交叉耦合的影响。已经用实验数据讨论了交叉耦合的问题，并提出了解决这种影响的方法。该研究涉及 OTPA 的三个限制之一。它是几个源输入之间交叉耦合的影响。已经用实验数据讨论了交叉耦合的问题，并提出了解决这种影响的方法。该研究涉及 OTPA 的三个限制之一。它是几个源输入之间交叉耦合的影响。已经用实验数据讨论了交叉耦合的问题，并提出了解决这种影响的方法。