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방진달대 적용에 따른 천장구조의 바닥충격음레벨 및 진동가속도레벨 저감 특성
홍다혜,김신태,김명준 한국소음진동공학회 2024 한국소음진동공학회 논문집 Vol.34 No.4
Anti-vibration hangers can effectively reduce sound and vibration transmitted through structural connections between concrete slabs and supported ceilings. This research examined the impact of installing anti-vibration hangers on reducing floor impact sound through mock-up tests. Results showed that with anti-vibration hangers, vibration acceleration levels decreased above 200Hz for both heavy- and light-weight impact sources. In terms of floor impact sound, reduction in heavy-weight impact sound was marginal, occurring only below 200Hz with a maximum decrease of 1.7dB. In contrast, the sound pressure level for light-weight impact sound steadily decreased by at least 2.7dB starting from 630Hz, reaching a maximum reduction of 4.8dB at 1250Hz. Therefore, the effectiveness of reducing both vibration acceleration and floor impact sound was confirmed for a lightweight impact source. This suggests that the application of anti-vibration hangers can effectively reduce floor impact sound, particularly in response to continuous impulsive sound like those generated by tapping machines.
조현철(Hyunchul Cho),박종민(Jongmin Park),이성훈(Seunghoon Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Anti-vibration rubbers in vehicle play an important roles in restrict vibration generated from engine and road. But, degradation occurs when rubber is exposed for a long time to heat, light, ozone and etc. These make the rubber hard and lose its initial properties. The changes of rubber make the N.V.H performance of vehicle worse, and give the discomport to the passengers. To reduce the changes of rubber properties, various ways to increase its heat-resistant property have been introduced. As a part of them, a heat-reflective coating method is studied in this paper. Heat-reflective coat protects the external heat sources, so that degradation of material properties decrease. Therefore, the initial property is maintained and the durability is increased. The test results of coated prototypes show the increase of heat-resistance and mechanical properties of anti-vibration rubber parts.
김국원,임종락,한용희,손희기,안태길 한국소음진동공학회 1998 소음 진동 Vol.8 No.5
Rubber materials are extensively used in various machine design application, mainly for vibration/shock/noise control devices. Over the years an enormous effort has been put into developing procedures to provide properties of rubber material for design function. However, there are still a lot of difficulties in the understanding of dynamic characteristics of the rubber components in compression. In this paper, the dynamic characteristics of rubber materials for anti-vibration under compression were investigated. Dynamic and static tests for rubber material with 3 different hardness were performed. In dynamic tests, non-resonance method, impedance method, was used to obtain the complex modulus(storage modulus and loss factor) and the effects of static pre-strain on the dynamic characteristics were investigated. Also, a relation equation between linear dynamic and nonlinear static behavior of rubber material was discussed and its usefulness to predict their combined effects was investigated.
환경조건에서 유체 동점성에 따른 하이드로 부시 특성변화에 관한 연구
손현철(Hyunchul Sohn),이홍기(Hongki Lee),박성욱(SungUk Park) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Anti-vibration rubbers are applied to vehicle suspension and sub-frame systems. Generally, conventional type rubber has good isolation performance at high frequency range due to low dynamic stiffness, but it has bad isolation performance at low frequency due to low damping coefficient. Therefore, many hydraulic bushes are used in vehicle to reduce vibration and noise caused by structure resonance. Hydraulic bush consists of main rubber part and fluid part. Main rubber part plays an elastic role (stiffness), and fluid part plays a viscose role (damping). Damping of fluid generates by flow through inertia track, and influences by fluid’s dynamic viscosity. Fluid is compounded to meet maximum freezing point and minimum boiling point. In this paper, we study dynamic characteristics of hydraulic bush according to various viscosity of fluid. Also, we study change trends of fluid viscosity under various environment condition (temperature). Finally, we measure dynamic characteristic under various temperature conditions. The results of experiments show that dynamic characteristics of hydraulic bush influenced by fluid dynamic viscosity