• Title, Summary, Keyword: Vibration

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A Study on the Prediction Method of Blasting Vibration (발파진동 예측방법에 관한 연구)

  • Lee, Yeon-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.361-365
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    • 2006
  • In order to predict method of blasting vibration in ground and it's resident located around blasting field in urban area, blasting vibration characteristics were measured the vibration velocity(cm/sec), vibration acceleration($cm/sec^2$), vibration acceleration level(dB) and vibration level(dB(V)). The charged powder were used to 1.25kg and measuring sites were 25 points front 4m to 90m at the ground. The correlation of vibration velocity, vibration acceleration, vibration acceleration level and vibration level by square root scaled distance and cube root scaled distance were investigated. The correlation of PPV(peak particle velocity) velocity by SRSD(square root scaled distance) and CRSD(cube root scaled distance) was 0.85 and 0.86 and the correlation of PVS(peak vector sum) velocity by SRSD and CRSD was 0.82. Also vibration acceleration, vibration acceleration level and vibration level by SRSD and CRSD was 0.61, 0.62 and 0.82, respectively. As results, the vibration velocity and vibration level(dB(V)) was showed good correlation, but the vibration acceleration and vibration acceleration level was not showed good correlation.

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Vibration Analysis of Rotary Compressor based on Vibration Intensity (진동인텐시티를 이용한 로타리압축기 진동 해석)

  • 이장우;김영종;안병하
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.973-978
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    • 2003
  • Vibration and Noise of air conditioner are entirely determined by compressor vibration. Compressor vibration transmitted to the enclosure of air conditioner or Pipes connected compressor with heat exchanger. Enclosure generated noise and vibration. Therefore, the analysis of compressor vibration analysis is considered significant technical issue. For the reduction of vibration of compressor, it is necessary to grasp correctly vibration transmission paths and excitation sources in the compressor shell. Because, shell (Surface of compressor) shows whole vibration characteristic of compressor mechanism. In this paper, vibration intensity was applied to measure vibration energy flow on the shell. From this technique, it is possible to catch the path of vibration propagation along the one cycle and the location of vibration energy sources may change with time on the shell.

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The Vibration Velocity and Vibration Level of Near-field Blasting Vibration in an Urban Blasting Site (근접장 발파진동에서 진동속도와 진동레벨의 비교)

  • Lee, Yeon-Soo;Chang, Seo-Il
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.8
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    • pp.918-923
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    • 2005
  • The vibration level (dB(V)) and vibration velocity (cm/sec) on the ground and buildings due to the differences of the measuring sites from the blasting source was investigated. To compare with vibration level and vibration velocity theirs magnitude was not surely directly proportional and vibration velocity 0.1 cm/sec was $45\~50$ dB(V). The difference between the measured vibration level and the calculated vibration level by Ejima's equation using vibration velocity PVS(peak vector sum) showed $21.0\~30.9$ dB(V) on the ground, $15.3\~23.6$ dB(V) on the apartment, respectively. And the correlation of vibration velocity and nitration level at the measuring sites of lower altitude showed higher than that of higher altitude.

The Vibration Velocity and Vibration Level of Near-field Blasting Vibration in an Urban Blasting Site (근접장 발파진동에서 진동속도와 진동레벨)

  • Lee, Yeon-Soo;Chang, Seo-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.766-771
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    • 2005
  • To compare blasting vibration at blasting construction field in urban area, the vibration level (dB(V)) and vibration velocity (cm/sec) on the ground and the structure of buildings due to the differences of the measuring sites from the blasting source is investigated and the difference between the measured vertical vibration level and the calculated vibration level by using vibration velocity PVS and the correlation between vibration velocity and vibration level and is studied in the thesis.

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Maxima Response Spectrum for each Mechnical Vibration and its Application (기계적 진동에 대한 MRS 및 MRS의 응용)

  • 김재하;우호길
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.1
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    • pp.234-245
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    • 2001
  • This paper considers the Maximum Pesponse Spectrum for the random vibration, sinusoidal vibration, linear sweep vibration. The random vibration quality levels and the sinusoidal vibration quality level are compared using MRS. And the severity between the vibration test specification and real environments using Maximum Response Spectrum are also compared using it.

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Vibration Analysis of Rotary Compressor based on Vibration Intensity (진동인텐시티를 이용한 로타리압축기 진동 해석)

  • 안병하;이장우
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.166-172
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    • 2003
  • Vibration and Noise of air conditioner are entirely determined by compressor vibration. Compressor vibration transmitted to the enclosure of air conditioner or pipes connected compressor with heat exchanger. Enclosure generate(noise and vibration. Therefore, the analysis of compressor vibration analysis is considered significant technical issue. For the reduction of vibration of compressor, it is necessary to grasp correctly vibration transmission paths and excitation sources in the compressor shell. Because, shell ( Surface of compressor ) shows whole vibration characteristic of compressor mechanism. In this paper, vibration intensity was applied to measure vibration energy flow on the shell .From this technique, it is possible to catch the path of vibration propagation along the one cycle and the location of vibration energy sources may change with time on the shell.

investigation on Human Effects of Vibration and Noise Exposed on Human: I. Human Vibration (인체 진동소음의 인체영향에 대한 국내외 기술조사 : 인체 진동)

  • 정완섭;권휴상
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.691-694
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    • 2001
  • The recent national contract (Ecotechnopia 21) supported by the ministry of environment puts much significance on new issues for the assessment of human effects arising from vibration and noise exposed to human. This paper focuses only on hand-arm vibration since it has been a major problem in protecting vibration exposure to human. To set up a systematic way of assessing adverse effects of hand-arm vibration, surveys were made on recent international standards and researches related to hand-arm vibration. The measurement and evaluation methods of hand-arm transmitted vibration, the relationship between vibration exposure and effects on health, and the assessment methods of nerve dysfunctions are addressed in this paper. Those methods are linked into a logical way of assessing effects of hand-arm vibration on human. Finally, the current activities and achievements in this work are briefly summarised.

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Development of Empirical Equations for Estimating the Train-Induced Ground Vibration (철도연변 지반 진동 Data Base 구축을 통한 지반진동예측 실험식)

  • 황선근;고태훈;엄기영;오상덕
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1022-1027
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    • 2001
  • In this study, the train-induced vibration was measured at many locations at/around the actual service lines and the data base was constructed using the measurement results. The characteristics of train induced ground vibration was categorized and the empirical ground vibration estimating equations were developed. On the ground area (level grounds, embankments, cut sections), the vibration estimating equations were developed in terms of ground vibration level which was related with the distance from the source. Especially for the cut section areas, the vibration levels were expressed with the vibration receiving point expressed by the ratio of vertical distance to horizontal distance(V/H) from the source. As a result, when V/H is 0.96, the vibration estimating equation gives a minimum vibration level.

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Vibration Durability Analysis for Components of Construction Equipment Industry (건설중장비 부품의 진동내구해석)

  • Kim, Sunghwan;Ham, Jeonghoon;Kang, Hyunseok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.509-513
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    • 2013
  • There are so many types of construction equipment. Excavator is one of typical construction equipment which is working under the tough and severe environments. It's important for engineers to design CE components by the vibration durability point of view. Traditionally, two typical vibration durability methods to verify the durability of components. The first is experimental method which is using the vibration durability test bench. But experimental approach on vibration durability is needed a lot of cost and time. The second is analytical method which is using the vibration durability analysis such as Dirlik, Stainberg, Lalanne and others methodologies. The one of main advantages on vibration durability analysis can reduce the cost and time. We present a vibration durability analysis process and methodology on the guardrail system in excavator.

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Micro-vibration Isolation Performance Verification for the Passive Vibration Isolator using SMA Mesh Washer (SMA 메쉬 와셔를 적용한 수동형 진동절연기의 미소진동 절연성능 검증)

  • Kwon, Sung-Cheol;Jeon, Su-Hyeon;Oh, Hyun-Ung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.900-903
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    • 2014
  • Fly-wheel, Gimbal antenna, CMG, Spaceborne cyrocooler generate micro-vibration during their on-orbit operation as well as implementing their own function. To comply with the mission requirement of high resolution observation satellite, additional technical efforts have been required to isolate the micro-vibration derived from such payloads by applying the vibration isolator. In this study, we proposed a passive isolator using SMA mesh washer, which guarantees the structural safety of both micro-vibration disturbance source and itself under harsh launch vibration loads without an additional holding mechanism and the micro-vibration isolation performance on orbit environment. To verify the micro-vibration isolation performance of the proposed vibration isolator, we performed the micro-vibration isolation measurement test using the dedicated micro-vibration measurement device proposed in this study.

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