In this study, we developed a method for obtaining high contributing whole body vibration behavior to the vehicle interior noise at the running condition by modified operational TPA method (OTPA with PC model). The original OTPA with PC model requires measuring all reference and response points simultaneously. However, if the number of the point is so much, applying this method becomes hard. Hence, the proposed method was made to increase the applicability of this method by realizing to obtain the high contributing whole body vibration behavior without the simultaneous measurement of all points. In the method, several operational tests are repeatedly carried out in each measurement group and high contributing vibration behavior of each group to the response point (interior noise) was obtained as the high contributing partial PC mode. Subsequently, the high contributing whole body PC mode was obtained by integrating the partial PC modes. For obtaining it, relationship between each partial PC and the response point and original phase and amplitude compensation method were utilized. As the result, the high contributing whole body PC mode could be obtained well with much more less measurement points by comparing with the original OTPA with PC model and the applicability of the method was increased.
A suspended ceiling system (SCS) is one of the most fragile and non-structural elements during earthquakes. However, effective seismic protection technologies for enhancing the suspended ceiling system have not been developed other than the steel bracing system. An innovative passive vibration control system is proposed in this paper, which equipped a damper-employed pulley amplification mechanism into the indirect suspended ceiling system, named the pulley–damper ceiling system (PDCS). Theoretical formulation and the detailed information on the system were presented first. In addition, a new rotational damper composition consisting of a non-linear viscous damper was developed to follow the large wire-cable stroke. Six types of the full-scale ceiling specimens of a 15.6-square meter area with different configurations were constructed for the preliminary experiments to evaluate the seismic performance and feasibility of PDCS under simulated earthquake motions. The comparative results of the shake table test demonstrated that the application of PDCS is capable of controlling both displacement and acceleration of the ceiling panels. This study also presents the nonlinear time history analyses by modeling a wire-cable as an equivalent truss element to transmit the relative displacement of the ceiling system to the damper. The analytical model accurately simulated the dynamic behavior of PDCS.
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