A Study On Particle Impact Damping

Abstract

Particle impact damping is a passive damping method in which the vibration energy in the system is attenuated by placing multiple small size particles into the cavity on the main structure. A large number of small particles, placed into the cells formed on the system where vibration reduction desired, move during vibration and collide with each other and cell walls. Thus, they absorb the vibration of the main system to some extent. In this study, the performance of particle impact damper to decrease the vibration level of a single degree of freedom system excited from the ground in horizontal direction was investigated. A large number of spherical particles are placed into the cells. The Discrete Elements Method was used to model the dynamic interaction of particles with each other and cell walls, and depending on the number of particles a set of nonlinear equations was obtained. By the numerical solution of these equations, the vibration amplitudes of the system and the movement of each particle within the cell are obtained. In the numerical applications, it has been observed that the particles significantly attenuate the vibration of the main system.

Keywords

• Particle impact damping,Discrete Element Method,Hertz contact theory

PARÇACIK DARBESİ İLE TİTREŞİM SÖNÜMLEME ÜZERİNE BİR ÇALIŞMA

Abstract

Parçacık darbesi ile sönümleme, ana yapı üzerindeki boşluk veya boşluklara çok sayıda küçük boyutlu parçacıklar yerleştirilerek sistemdeki titreşim enerjisinin azaltıldığı pasif bir sönümleme yöntemidir. Titreşimi azaltılacak sistem üzerinde oluşturulan hücreler içine yerleştirilen çok sayıdaki küçük taneli parçacıklar titreşim esnasında hareket ederler ve hücre içerisinde birbirlerine ve hücre duvarlarına çarparlar. Bu sayede ana sistemin titreşimini bir miktar sönümlerler. Bu çalışmada, yatay doğrultuda zeminden tahrikli tek serbestlik dereceli bir yapının titreşim seviyesinin düşürülmesinde parçacık darbesi ile sönümleyicinin performansı incelenmiştir. Ana yapı üzerine açılan hücreler içerisine çok sayıda küresel parçacıklar yerleştirilmiştir. Parçacıkların birbiri ve hücre duvarları ile olan dinamik etkileşimini modellemek için Ayrık Elemanlar Yöntemi kullanılmış ve parçacık sayısına bağlı olarak çok sayıda doğrusal olmayan denklem takımı elde edilmiştir. Bu denklemlerin sayısal olarak çözülmesiyle sistemin zamana bağlı olarak titreşim genlikleri ve her parçacığın hücre içerisindeki hareketi elde edilmiştir. Yapılan sayısal uygulamalarda parçacıkların ana sistemin titreşimlerini önemli ölçüde sönümlediği görülmüştür.

Keywords

• Parçacık darbe sönümleme,Ayrık Elemanlar Yöntemi,Hertz temas teorisi

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