• Title/Summary/Keyword: Impact Sound Source

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Deviation of sound pressure level in receiving room according to the heavy-weight floor impact sources and it's positions (중량 바닥충격음 충격원의 종류 및 위치에 따른 수음실 음압레벨 변화)

  • Ju, Mun Ki;Han, Myung Ho;Oh, Yang Ki
    • KIEAE Journal
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    • v.9 no.4
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    • pp.23-28
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    • 2009
  • Standard sound source currently used in heavy-weight floor impact sounds that cause many social problems has excessive low-frequency energy within a range from 63 Hz to 125 Hz, and is difficult to evaluate and measure. To solve these problems, studies are widely performed using a new impact source, the impact ball. In this study, the sound fields in a receiving room were compared and analyzed according to the current impact source, the bang machine, and the impact ball. And deviation of sound pressure level according to the impact source positions were compared. In case of impact ball, the sound pressure level was lower at 63 Hz and below and higher at 125 Hz and above. The same trend was observed at the low-frequency range on the horizontal and vertical planes, regardless of the type of the impact source, which showed the influence of the room mode. There was a problem with the variations in the sound pressure level according to the size or shape of the receiving room. And it also shows that change of source positions may effect the single number rating scheme.

Evaluations on isolation method of floor impact sounds by real impact source (실충격원을 고려한 바닥충격음 저감방안의 평가)

  • Yoo, Seung-Yup;Lee, Pyung-Jik;Jeong, Young;Jeon, Jin-Yong;Ryu, Jong-Kwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.366-370
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    • 2006
  • In this study, characteristics of impact force and impact sound of impact source such as bang machine, impact ball, and children's jumping were review. Results of review showed that impact ball has most similar characteristic to real impact sources in terms of objective properties such as impact force and impact sound. The effects of various isolator on floor impact sound were also investigated in apartment building and test facilities building using bang machine an impact ball. From the field measurement, it was found that the difference in reduction sound level between bang machine and impact ball was relatively large and the reduction sound level by impact ball was much larger than bang machine.

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Korean Industrial Standard of “Rating of floor impact sound insulation for impact source in building and of building elements” (바닥충격음 차단성능 평가방법의 KS 규격화 방안)

  • 송민정;장길수;김흥식;김선우
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11a
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    • pp.383-386
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    • 2001
  • The KS of “Measurements of impact sound insulation of floors” was established before the years. But the KS of “Rating of floor impact sound insulation for impact source in building and of building elements” is not founded yet. To establish the rating measurement of floor impact sound insulation. The studies on the rating method of domestic floor system of impact sound insulation and response of its inhabitant’s were reviewed. And the rating method of ISO’s and JIS’s were studied in this consideration. The result of this study, KS of “Rating of floor impact sound insulation for impact source in building and of building elements” is proposed.

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An Experiment Study on Floor-Impact Sound Insulation by Resilient Materials in Apartment Buildings (완충재의 종류에 따른 공동주택 바닥충격음 차단성능에 관한 실험연구)

  • Youn, Se Cheol;Oh, Jong Min
    • Journal of Environmental Impact Assessment
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    • v.14 no.4
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    • pp.217-225
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    • 2005
  • In apartment buildings, floor-impact sound has bean regarded as the major source which induces complaints from residents. It is mainly due to the use of light-weight structures. The vibration produced by impact on one part of an apartment building would travel as far as the other parts of structure with a little alleviation. As a result, the impact sound from upstairs has been regarded as a main source of noise causing discontentment among occupants. This study was carried out to measure the floor-impact sound levels and evaluate the insulation performance of floor-impact sound for nine apartment buildings. The floor-impact sound levels were measured for twenty-five On-dol floor structures and various factors which influence the floor-impact sound were analyzed.

Comparison of the Standard Floor Impact Sound with Living Impact Source by Subjective Evaluation

  • Park, Hyeon Ku;Kim, Kyeong Mo;Kim, Sun-Woo
    • KIEAE Journal
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    • v.14 no.1
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    • pp.39-48
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    • 2014
  • In the previous test, the verification of the standard floor impact source was carried out comparing the physical characteristics with living impact sources. The result was appeared the validation of the standard impact source was very low because of differences of physical characteristics. This study aims to evaluate annoyance and loudness of standard impact source which is used for the measurement of floor impact sound, and to compare the annoyance and loudness of living impact sources which are produced in real life. The impact sources considered are tapping machine, tire and impact ball as standard sources, and nine real sources which were chosen from the existing researches. The result showed differences of annoyance and loudness between standard impact sources and living impact sources, which means the standard impact sources may rate the performance of floor system inappropriately. In the future, the rating method should be examined how the standard impact sources are similar with real sources in the point of rating the performance of floor system.

Evaluation of uncertainty in measurement of floor impact sound insulation of buildings using standard heavy impact source (표준중량충격원을 이용한 건축물의 바닥 충격음 차단성능 측정불확도 평가)

  • Yong-Bong Lee;Hyok-Je Kwon;Chang-Whan Kim;Man-Hee Cho;Hang Kim;SungSoo Jung
    • The Journal of the Acoustical Society of Korea
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    • v.42 no.2
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    • pp.143-151
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    • 2023
  • In this paper, a method for evaluating the measurement uncertainty is proposed when measuring of floor impact sound insulation of buildings using standard heavy impact source. In addition to the effect of repeated measurements, several other factors such as measurement location, impact location, equipment used for sound pressure measurement, and heavy impact source, were considered. A mathematical model for the average maximum impact sound level and the uncertainty evaluation method for each factor were proposed. The present proposed method was applied to measurement results to evaluate the average maximum impact sound pressure level and the measurement uncertainty.

Evaluation of Floor-Impact Sound Insulation for Apartment Buildings (공동주택 바닥충격음의 차음성능 평가)

  • 윤세철;오종민
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.932-937
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    • 2003
  • In apartment buildings, floor-impact sound has bean regarded as the major source which induces complaints from residents. It is mainly due to the use of light-weight structures. The vibration produced by impact on one part of an apartment building would travel as far as the other parts of structure with a little alleviation. As a result, the impact sound from upstairs has been regarded as a main source of noise causing discontentment among accupants. This study was carried out to measure the floor-impact sound levels and evaluate the insulation performance of floor-impact sound for seven apartment buildings. The floor-impact sound levels were measured for seventeen On-dol floor structures and various factors which influence the floor-impact sound were analyzed.

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An Experimental Study or the Prediction Method of Floor Impact Sound Insulation Performance in Apartment House Using Impedance Method(II) (임피던스법을 이용한 공동주택 바닥 충격음 차음성능 예측방법에 관한 실험 적 연구(II) - 경량 표준충격원을 중심으로 -)

  • 김재수;장길수;김선우
    • Journal of KSNVE
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    • v.2 no.1
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    • pp.21-31
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    • 1992
  • In the previous paper, we report a practical floor impact sound level prediction method for a heavyweight impact source(Tire), soft impact source such as children jumping and running. According to these results, the calculated value and the measured value correspond comparatively well, regardless of differences in the floor structures. And the floor impact sound for a heavyweight impact source, soft source was strongly influenced by structural factors such as floor slab stiffness and peripheral support conditions. But the floor impact sound for a light impact source (Tapping machine), hard impact source was influenced by resilient layers, composed of multi-layer in floor structures. Thus, In this paper, 4 actual floor structures, all with differing resilient layers, were calculated using impedance method. When these calculation values were compared with the measured values, approximately all the values fell with one rank of the sound insulation grade, reference curve(L curve) by the JIS standard. So, a sample of measured values and calculated values from floor structures is presented to show the accuracy and appropriateness of the impedance method in domestic.

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Verification of Effectiveness of the Standard Floor Impact Source by Comparing with Living Impact Sources (실생활 충격소음을 통한 표준 바닥충격원의 실효성 검증)

  • Park, Hyeon Ku;Kim, Kyeong Mo;Kim, Sun-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.12
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    • pp.1117-1126
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    • 2013
  • The standard impact sources, standardized to rate the sound insulation performance of floor structure, should simulate well the real floor impact sources, which is very important to grade the floor structure then to establish counter plan to improve the performance of floor. Recently the tire, the standard heavyweight impact source, has been discussed that the impact force is too big to represent the real impact force. And researches have been carried on the applicability as a substitute or a supplementary. In addition, tapping machine, the standard lightweight impact source, is also questionable if it is representative of real lightweight impact source. This study aims to examine the similarity of standard impact sources with living impact sources, comparing the physical characteristics such as impact force, frequency contents and sound level. The result showed that the physical characteristics of standard impact sounds were somewhat different with that of living impact sounds, and the standard sources couldn't be verified from this result. Later subjective evaluation should be followed to compare how the physical differences make relationship with the subjective differences.

Evaluation of Floor Impact Sound by Floor Coverings in Standard Test Building (표준시험동에서 바닥마감재에 따른 바닥충격음 특성평가)

  • Kim, Hak-Cheon;Kim, Yong-Gil;Kim, Sang-Chul;Lee, Hyun-Lyul;Cho, Hyung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.439-440
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    • 2008
  • Five floor coverings were tested with three different types of floor structures in the standard test building in order to evaluate the effectiveness of the floor impact sound reduction. The level of floor impact sound reduction is influenced by not only the types of floor coverings but interrelationship between the floor coverings and floor structures. From the tests, it was found that floor coverings were effective in reducing the floor impact sound using the light impact source. In addition, proper mixtures of the floor structure and the floor covering have shown effectiveness to a certain extent in reducing the floor impact sound using the heavy impact source.

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