Jian He

TL;DR: In this article, the authors investigated the control performance of pounding tuned mass damper (PTMD) in reducing the dynamic responses of SDOF (Single Degree of Freedom) structure and showed that satisfactory vibration mitigation and robustness can be achieved by an optimally designed PTMD.

TL;DR: In this article, a parametric study for a 14-storeys steel structure is presented to investigate the performance of PTMD device in multiple degree of freedom (MDOF) system, and results from numerical simulations demonstrated that properties of viscoelastic material and gaps between mass block and the limiters are key factors for vibration control performance.

TL;DR: Based on the summary of existing pounding force analytical models, an updated pounding force analysis method is proposed by introducing viscoelastic constitutive model and contact mechanics method as mentioned in this paper, and the results show certain accuracy in proposed model.

TL;DR: In this article, the authors used L(0,2) mode guided waves to identify, locate, and image single and double defects in straight pipe structures, and the influence of different excitation frequencies on the reflection coefficient of L( 0, 2) modal guided wave is studied.

TL;DR: In this article, two new damage indexes were proposed by analyzing the amplitudes of low-frequency signal direct wave and highfrequency signal maximum component, and the results showed good agreement with the numerical simulation which further verifies the feasibility of the proposed method.