A Study On Particle Impact Damping

Year 2019, KONJES_c7_Special_Issue, 875 - 886, 30.12.2019

Osman Yiğid , Orhan Çakar

https://doi.org/10.36306/konjes.623818

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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