This study investigates reducing the vibration of structures under different earthquakes using magnetorheological dampers. To investigate the effect of the magnetorheological damper arrangement on reducing the vibration amplitude of structures, experimental studies are conducted in which magnetorheological dampers are commanded by a robust controller. So, the performance of the system is investigated using different combinations of two magnetorheological dampers on a building and three different arrangements for dampers are considered for experimental study. Additionally, an H 1 controller is designed to determine the voltage transmitted to the magnetorheological dampers. The results show that the magnetorheological damper commanded with the robust controller effectively reduces the vibration of a sixstory steel structure. Furthermore, the magnetorheological damper arrangement in which the one end is connected to the ground reduces the vibration amplitudes.
This paper investigated the performance of a semi-active tuned mass damper (STMD) on a multi-degree of freedom (MDOF) building model. A magnetorheological (MR) damper was used as a control element that provided semi-activity in the STMD. The Hardware in the Loop Simulation (HILS) method was applied to mitigate the difficulty and expense of experimental studies, as well as to obtain more realistic results from numerical simulations. In the implementation of this method for the STMD, the MR damper was set up experimentally, other parts of the system were modeled as computer simulations, and studies were carried out by operating these two parts simultaneously. System performance was investigated by excitation with two different acceleration inputs produced from the natural frequencies of the MDOF building. Additionally, a robust H∞ controller was designed to determine the voltage transmitted to the MR damper. The results showed that the HILS method could be applied successfully to STMDs used in structural systems, and robust H∞ controls improve system responses with semi-active control applications. Moreover, the control performance of the MR damper develops with an increase in the mass of the STMD.
ÖzBu çalışmada çok serbestlik dereceli bir bina modelinin bozucu girişler etkisindeki cevaplarını iyileştirmek için yarı-aktif ayarlı kütle sönümleyicisi (YAKS) kullanılmıştır. Tasarlanan YAKS'de yarı-aktifliği sağlayan kontrol elemanı olarak Magnetorheological (MR) sönümleyici kullanılmıştır. MR sönümleyiciler uygulanan gerilimle sönüm oranı ayarlanabilen kontrol elemanlarıdır. Uygun bir kontrol algoritmasıyla bu gerilim değerlerini belirlemek mümkündür. MR sönümleyici oldukça nonlineer bir karaktere sahiptir ve çalışması esnasında ısınır. Bu ısınmadan dolayı sahip olduğu parametre değerleri çalışma sırasında değişebilir. Bu yüzden hem nonlineerliklerin hem de parametrik belirsizliklerin üstesinden gelebilecek bir kontrolör kullanılması performansı arttıracaktır. Bu amaçla, bu çalışmada nonlineer uyarlamalı kontrol algoritması tasarlanmıştır. Kontrolcü performansı, pasif kontrol uygulaması olan ayarlı kütle sönümleyicisi (AKS) ile YAKS karşılaştırılarak incelenmiştir. Sonuçlar, uyarlamalı kontrol uygulamasıyla YAKS'nin AKS'den daha iyi performans gösterdiğini kanıtlamıştır.
In this study, an effective and new design method was used to determine the parameters of the PID controller used in order to improve the performance of a vehicle's active suspension system and to suppress vibrations in the vehicle. In this method, the PID controller is designed based on the optimal proportional gain kp setting, taking into account the settling time and maximum overshoot of the quarter vehicle system. This method is based on obtaining the other parameters of the controller by adjusting the kp to minimize the settling time and maximum overshoot error in a stable cycle. The obtained simulation results were evaluated by comparing the uncontrolled suspension system and the suspension system in which the PID controller whose parameters were adjusted with the proposed effective design method. It suppressed the system responses of the PID controller more effectively than the passive suspension system.
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