Wheel Size Embedded Two-Mass Vehicle Model for Scanning Bridge Frequencies

• Main Authors: Cao, Cheng-Yi, 曹成翊
• Other Authors: Yang, Judy P.
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/fwf52m

碩士 === 國立交通大學 === 土木工程系所 === 107 === In order to supervise and maintain the health condition of bridges, the bridge frequency can be one of the important indicators among related parameters. Generally, if a bridge suffers any damage, the partial or overall stiffness of the bridge will be affected, thus making bridge frequencies shifted. The traditionally direct approach is the main method to measure bridge frequencies, which relies on the installation of several sensors along the bridge and the calculation of bridge frequencies by gauging the dynamic responses from sensors. As the direct approach is time-consuming and laborious, the indirect approach has been developed in recent years. In the theory of vehicle-bridge interaction (VBI), the bridge frequencies can be captured from the dynamic responses of the test vehicle. The original vehicle model was assumed to be a point mass. As it is unrealistic to reflect the vehicle responses, the wheel size embedded two-mass vehicle model is proposed in this study. The effects of the wheel size and other related parameters on the identification of bridge frequencies are investigated. From the results of numerical simulation, it is found that as the wheel size increases, the relative error of the bridge frequency identification decreases; as the unsprung mass increases, the identification of bridge frequency becomes clear.