Lokal Kütle Konumunun Ses İletim Performansına Etkisinin İncelenmesi

Abstract

Bu çalışma, hafif polimer esaslı yapılarda lokal (yerel) kütle dağılımının vibro-akustik performans üzerindeki belirleyici rolünü, 3 mm kalınlığındaki daire biçimli bir PLA plaka üzerinden sistematik olarak incelemektedir. Geleneksel hoparlörlere seçenek olarak gelişen ses uyarıcılarının (exciter) verimliliğini artırmayı hedefleyen araştırmada, asimetrik modların uyarılması amacıyla eksantrik (merkez dışı) bir bağlantı yapısı tercih edilmiştir. 0–5000 Hz frekans bandında gerçekleştirilen ardışık modal, harmonik yapısal ve harmonik akustik analizler, plaka üzerindeki 200 gramlık lokal kütlenin 8 farklı konumdaki etkisini ortaya koymaktadır. Elde edilen veriler, kütle yerleşiminin sadece titreşim genliğini değil, aynı zamanda akustik ses iletim verimini de doğrudan yönettiğini kanıtlamaktadır. Analiz sonuçlarına göre, lokal kütlenin stratejik konumlandırılmasıyla ses basınç seviyesinde (SPL– Sound Pressure Level) belirli frekans bantlarında hedeflenen artışların veya mod baskılanması yoluyla azalışların sağlanabildiği görülmüştür. Örneğin, kütle konumu değişiminin SPL bazında ise yaklaşık 8 dB’lik bir varyasyona neden olduğu tespit edilmiştir. Bu araştırma, lokal kütle yerleşiminin rastgele bir yapısal yükten ziyade, vibro-akustik performansı optimize eden stratejik bir tasarım değişkeni olarak kullanılabileceğini literatüre sunmaktadır. 

Keywords

• Ses basınç seviyesi
• Lokal kütle etkisi
• akustik performans
• titreşim ve akustik

Experimental Investigation of Sound Transmission Performance of Plates Made from Different Materials

Abstract

This study systematically investigates the decisive role of local mass distribution on the vibro-acoustic performance of lightweight polymer-based structures, using a 3 mm thick circular PLA plate. Aiming to enhance the efficiency of sound exciters emerging as an alternative to traditional loudspeakers, an eccentric (off-center) attachment configuration was preferred to stimulate asymmetric modes. Sequential modal, harmonic structural, and harmonic acoustic analyses conducted within the 0–5000 Hz frequency range reveal the impact of a 200-gram local mass at eight different positions on the plate. The obtained data proves that mass placement directly governs not only the vibration amplitude but also the acoustic sound transmission efficiency. According to the analysis results, it was observed that targeted increases in sound pressure level (SPL) in specific frequency bands, or reductions through mode suppression, can be achieved by strategically positioning the local mass. For instance, it was determined that the change in mass position caused a variation of approximately 8 dB in terms  of SPL. This research presents to the literature that local mass placement can be utilized as a strategic design variable that optimizes vibro-acoustic performance, rather than being a random structural load.
 

Keywords

• Sound pressure level (SPL)
• Local mass effect
• Acoustic performance
• Vibration and acoustics
• Vibro-acoustic analysis

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