Numerical modelling of multiple tuned mass damper equipped with magneto rheological damper for attenuation of building seismic responses

TMD is basically designed to be tuned to the dominant frequency of a structure which the excitation frequency will resonate the structural motion out of phase to reduce unwanted vibration. However, a single unit TMD is only capable of suppressing the fundamental structural mode and for multimode control, more than one TMD is needed. In this study, a 3-storey benchmark reinforced structural building subjected to El Centro seismic ground motion is modelled as uncontrolled Primary Structure (PS) by including properties such as stiffness and damping. For the case of controlled PS which the passive mechanism is included to the system, optimum parameters of both TMD and Multiple TMD (MTMD) are designed to be tuned to the dedicated structural modes where the performance is dependent on parameters such as mass ratio, optimum damping ratio, and optimum frequency ratio. The input and output components of structural system arrangements are then characterized in the transfer function manner and then converted into state space function. For enhancement of the passive system, Magneto-Rheological (MR) damper is added to both single TMD and MTMD passive system. The response analysis is executed using both time history and frequency response analysis. From the analysis, semi-active case is the most effective mechanism with 99% displacement reduction for the third and second floors, and 98% for the first floor, compared to the uncontrolled case. It is concluded that the MR damper significantly contributed to the enhancement of the passive system to mitigate structural seismic vibration

Kajian Keberkesanan Pembelajaran Interaktif Berasaskan Aplikasi Kahoot:: A Case Study of the Principles of Marketing Course

Nowadays, the use of game elements is used in various contexts for various purposes. Game in the form of online is one of the alternative methods in the teaching and learning of this 21st century student. Kahoot is one of the methods in interactive learning today. It is an alternative method that can increase the motivation of students in the classroom. The aim of this study was to examine the effectiveness of this method to the students who take the course of marketing principles to solve problems in understanding the content of the topics of marketing mix. A total of 40 students were involved in this study. As a result of a preliminary survey conducted through theory test in the classroom, the previous results obtained by the students were at an unsatisfactory level. Research conducted over the last semester and has shown encouraging results for students and lecturers. The use of the Kahoot portal in the form of online exercises, reviews and assignments has shown students to be more excited and excited to learn the marketing mix. The use of the Kahoot portal in the form of online exercises, reviews and assignments has shown students to be more excited and excited to learn the marketing mix. The findings showed that there was an increase in student achievement and found that the comparison of the results between the Pre-Action and Post-Action Test on these 40 students had increased relatively. In addition, the findings from the questionnaire were also carried out that students also showed a tendency and interest in the teaching methodology. Hence, this online game teaching method can be seen as one of the most effective methods of teaching and learning in the R & D (Learning and Teaching) sessions, especially in the course principles of marketing