On the use of fixed point theory to design coupled core walls
The use of Fixed Point Theory (FPT) to optimize the design of coupling beams in coupled core wall (CCW) systems is demonstrated. The basis for optimization is minimizing the transmissibility of horizontal ground motion by appropriately linking two coupled wall piers having different dynamic properties with beams having appropriate stiffness and damping characteristics. Using 21 example CCW structures illustrating a range of pier properties, it was shown that the resulting optimization of coupling stiffness is quite small and other design considerations will require stiffer, non-optimal coupling beams. Nonetheless, the potential to leverage the small amount of coupling available in a ‘slab-coupled’ series of wall piers in order to reduce transmissibility is suggested by the findings of this study.
Vibration Control Method for Parallel Structures Connected by Damper and Spring
The purpose of this study is to analyze a simultaneous vibration control method of structures. The analyses are performed under the following assumptions: each structure is composed of a mass and spring and vibrates in a one-degree-of-freedom mode, and a vibration input is applied to the base of the structure. Here, the vibration model is composed of two structures connected by one damper and one spring in parallel. From the analyses, it was clarified that the theory of P, Q is useful as a method of optimum adjustment of this vibration control model. In addition, the optimum design procedure is described, the optimum values of tuning and damping parameters of this model are specified in graphical form, and the effectiveness of this method in reducing the transmissibility during resonance is shown to be considerably greater than that of the method connecting two structures by only a damper.
Kinemamtic analysis of flying-saw vehicle
The paper analyzes the kinematic motion of the flying-saw vehicle.After the analysis,it is concluded that the ac- celerating periods and decelerating periods in both forward and backward directions will follow sin~2αcurve and,in order to increase the sawing dimensional accuracy,flying-saw vehicle must come back as soon as possible while acceleration remains constant.Based on this premise,the paper gives out the equations of kinematic motion of the flying-saw vehicle in every sta- ges and one example result in a common situation.By now this method has been used in the real situation.