• Title/Summary/Keyword: Floor Impact noise

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Factor Analysis of the Aircraft Noise Impact Assessment in the Building Site Development District Around of Gimpo Airport (김포공항 주변 택지개발지구 항공기소음 영향평가에 미치는 요인분석)

  • Kim, Heung-Sik;Ju, Si-Woong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.6 s.99
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    • pp.718-723
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    • 2005

  • The purpose of this study is to present a fundamental data for evaluating aircraft noise of building site development. By the field experiments and the predicted equal noise level contours using the INM program, actual condition in the building site development arranged district was investigated. In order to get the results, Analysis of factors effected on noise level, sound level on the rate of increase to aircraft demand and difference on the aircraft noise levels according to floor level in apartment house was carried out. As a result the influence of the take-off and landing direction were appeared greatly. The influences of the height at receiving point, movement number of aircraft and increase to aircraft demand were appeared small And the influence of 1 day average WECPNL must be considered.

  • https://doi.org/10.5050/KSNVN.2005.15.6.718 인용 PDF KSCI

Propagation of floor impact vibration in a 1:10 scale model of a test structure (1:10 축척 시험동 구조 모형의 바닥충격 진동 전달)

  • Lee, Pyoung-Jik;Yoo, Seung-Yup;Kim, Jae-Ho;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.1455-1458
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    • 2007

  • Vibration characteristics of concrete slabs were investigated using a 1:10 scale model and finite element method. A 1:10 scale model of a test building with 150 and 200mm slab thicknesses was made of acrylic materials. Modal test was conducted to investigate mode shape and modal frequencies. Results show that the mode shapes of two slabs with different thickness are similar each other, whereas natural frequency is different. Through modal analysis using FEM, it was revealed that both mode shapes and natural frequencies calculated from the FEM model are similar to those of the scale model measurement. It was also found that natural frequencies increased with increment of the slab thickness.

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Simplified method on measurement and evaluation of floor impact sound using impact ball (임팩트 볼에 의한 바닥충격음 측정 및 평가 간편법)

  • Kim, Yong-Hee;Lee, Sin-Young;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.631-635
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    • 2006

  • In this study, simplified methods on measurement and evaluation of heavy-wight impact sound was proposed due to provide easy quality control method to construction engineers. The simplified methods include using of rubber impact ball instead of bang machine, reduced number of measuring and impact positions which is prescribed as over 4 points, using of hand-held sound level meter as a frequency analyser and prediction equation for $L_{i.Fmax.AW}$, single number rating, using $L_{Amax}$, and $L_{Lmax}$ at each frequency band. The results showed that a method of boundary driving and boundary measuring is the most similar to the current rating method.

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Case study on frequency bands contributing the single number quantity for heavy-weight impact sound based on assessment method changes (중량충격음 평가방법 변화에 따른 단일수치평가량 기여 주파수 대역 사례 분석)

  • Hye-kyung Shin;Sang Hee Park;Kyoung-woo Kim
    • The Journal of the Acoustical Society of Korea
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    • v.42 no.6
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    • pp.565-571
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    • 2023

  • With the introduction of the post-verification system, the measurement of floor impact noise performance on-site has become mandatory, and the evaluation method has changed. To track the performance changes since the policy implementation, research is needed on how the characteristics of heavyweight impact sound change according to the varied evaluation method. In this study, we analyzed the contribution rate of the frequency band-specific sound pressure level on the single-number quantity for a multi-family housing unit with the same floor plan and floor structure, comprising 59 households, based on the changed impact sources and evaluation indicators. It is difficult to compare simply because the method of calculating contributions by frequency band according to the single-day evaluation is different, but the average contribution rate of 63 Hz was 80.8 % in the evaluation method before the introduction of the post-confirmation system (Tire measurement and evaluated as L'i,Fmax,AW), and the average contribution rate of 125 Hz was 19.2 %. The current evaluation method (rubber ball measurement and evaluation as L'iA,Fmax) shows that the contribution rate has decreased to 33.1 % on average at 50 Hz ~ 80 Hz, 58.7 % on average at 100 Hz ~ 160 Hz, 6.9 % on average at 200 Hz ~ 315 Hz, and 1.3 % on average at 400 Hz ~ 630 Hz. This result is a case analysis for the target apartment house, and it is necessary to analyze measurement data for more diverse apartment houses.

  • https://doi.org/10.7776/ASK.2023.42.6.565 인용 PDF