KARBONİL DEMİR VE MANYETİT ESASLI MANYETOREOLOJİK SIVILARIN SÖNÜMLEME PERFORMANSI VE KATKI MADDESİ OLARAK SİLİKA DUMANI KULLANIMI

Manyetoreolojik (MR) sıvılar yarı-aktif sönümleme sistemlerinde kullanılan manyetik alan bağımlı sıvılardır. MR sıvılar genellikle taşıyıcı bir sıvı içerisinde dağılmış manyetik parçacıklardan oluşmaktadır. Bu çalışmada, karbonil demir ve manyetit esaslı beş farklı MR sıvı, çeşitli demir konsantrasyonları ile silikon yağı içerisinde hazırlanmıştır. Karbonil demir parçacıklarının çökelmesini azaltmak için katkı maddesi olarak silika dumanı kullanılmıştır. MR sıvıların performansı, bir binek araç amortisörünün boyutlarına uygun olarak tasarlanıp üretilen MR amortisör prototipi kullanılarak test edilmiştir. MR sıvıların performansını etkileyen çökelme kararlılığı da gözlenmiştir. Parçacık türünün, konsantrasyonun ve silika dumanının MR sıvıların sönümleme performansı üzerindeki etkileri değerlendirilmiştir. Sonuçlar; akım 2Ae kadar arttırıldığında kütlesel olarak %40 karbonil demir ve %2 silika dumanı içeren MR sıvı için sönümleme kuvvetinin %40a kadar arttığını göstermiştir.

DAMPING PERFORMANCE OF CARBONYL IRON AND MAGNETITE-BASED MAGNETORHEOLOGICAL FLUIDS AND USAGE OF FUMED SILICA AS AN ADDITIVE

Magnetorheological (MR) fluids are magnetic field dependent fluids used in the semi-active damping systems. MR fluids usually consist of magnetic particles dispersed in a carrier liquid. In this work, five different carbonyl iron and magnetite-based MR fluids were prepared with various iron concentrations in silicone oil. The fumed silica was used as an additive to reduce sedimentation of the carbonyl iron particles. Performance of the MR fluids was tested by using the prototype of MR damper designed and manufactured in accordance with the dimensions of a passenger car s shock absorber. Sedimentation stability which affects the performance of the MR fluids was also observed. The effects of particle type, concentration and fumed silica on the damping performance of the MR fluids were evaluated. The results showed that when the current is increased up to 2 amps, the damping force is increased by 40% for the MR fluid containing 40% carbonyl iron and 2% fumed silica by mass.

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