• Title, Summary, Keyword: Path Analysis

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Prediction Of Vibrating Panel's Radiating Noise By Transfer Path Analysis (전달경로해석법에 의한 진동하는 판넬의 방사 소음 예측)

  • Oh, Jae-Eung;Lee, Sun-Hun;Jeong, Un-Chang;Kim, Jin-Su;Lee, You-Yup
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.292-293
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    • 2014
  • Transfer Path Analysis is technique predicting transmitted energy through each path. Using the Transfer Path Analysis, structure-borne noise and air-borne noise can be predicted from the system. In this study, however, the Transfer Path Analysis to target only the structure-borne noise due to the noise radiated from the vibrating panel was performed. Predicted noise by the Transfer Path Analysis and measured noise by the experiment were a high correlation. We confirmed the validity of the Transfer Path Analysis through the analysis of these results, showed how to apply the Transfer Path Analysis.

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Contribution analysis using transmissibility of a vibration path (진동 전달율에 기반한 기여도 분석 방법)

  • Kim, C.J.;Bae, C.Y.;Lee, D.W.;Lee, B.H.;Kim, H.C.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.602-603
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    • 2008
  • The design modification of problematic component in a given vibration path is disallowed in order to sacrifice other performances such as ride comport or handling of a vehicle. For this, the paper presents a new contribution analysis based on transmissibility ratio (TR) of acceleration in a definite vibration path to find a proper candidate for design modification. The new contribution analysis is based on the fact that the sensitivity of TR over a small design change is inversely proportional to the magnitude of TR. The new methodology can significantly relieve efforts of time-consumming modal analysis for detail modal information. The theory of proposed contribution analysis is simulated with five-degree-of-freedom open vibration path and confirms that the contribution result is well matched with the variance of TR over a dynamic change on a vibration path.

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Application of Air-Borne Noise Path Analysis to a real vehicle (실차에 대한 공기기인 소음경로분석법 적응)

  • Kim, Yoon-Jae;Jeong, Won-Tae;Song, Moon-Seong;Kang, Yeon-June;Kim, Hong-Bin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.699-702
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    • 2006
  • Noise Path Analysis is commonly used method to analysis noise transmission characteristics of a system. To analysis transfer paths of a system, it is necessary to know operating forces at each transfer path. The method to find out operating forces is divided into two methods. The one is a direct method which measures operating forces directly and the other is an indirect method which estimates operating forces mathematically. However, the indirect method is more commonly used because of the difficulty of measurement. This paper is focused on the indirect method and air-borne noise of a vehicle. Noise Path Analysis for Air-Borne Noise is applied to a real vehicle.

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A Study on Pedestrian Accessibility Considering Social Path (Social path를 반영한 보행 접근성 평가에 관한 연구)

  • Choi, Sung Taek;Lee, Hyang Sook;Choo, Sang Ho;Kim, Su Jae
    • Journal of Korean Society of Transportation
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    • v.33 no.1
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    • pp.50-60
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    • 2015
  • Pedestrians not only walk along roads, but also pass through buildings or across open spaces. This study defines these unusual walk routes as social path. Social path is an informal pedestrian route that is not considered in a pedestrian network, even though it should be regarded as pedestrian route considering the fact that many people actually use this path. In response, current study related to travel behavior cannot evaluate properly due to lack of consideration for realistic travel behavior such as social path. In order to deal with this situation, this study analyzes the effect of social path at two complex centers in Seoul. Evaluation indices are service area analysis and urban network analysis which is one of the spatial network analysis. In particular, we subdivide the network into three steps by the level of network building and analyze each step. As a result, it is revealed that step three which includes social path shows the greatest improvement in pedestrian accessibility. In this regard, we confirm that social path should be considered when evaluating pedestrian accessibility in further studies. Furthermore, a lot of undervalued facilities will be re-appraised in the field of travel behavior.

Timing Analysis by Concurrent Event Propagation (병렬 사건전파 방식에 의한 타이밍 분석)

  • Han, Chang-Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.10
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    • pp.1344-1348
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    • 1999
  • This paper proposes concurrent event propagation technique for timing analysis. The technique makes it possible to find several input vectors and sensitizable paths at the same time. The concurrent event propagation technique is based on the event driven simulation and the timing analysis technique with boolean equations. The technique propagates as many events as possible at the same time while preventing propagation of boolean terms which do not sensitize paths. Since events do not propagate through false paths, the longest path which successfully propagates events to one of the primary outputs is one of the longest sensitizable paths. The technique can speed up timing analysis by unifying path sensitization and maximum delay calculation.

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Path Analysis for Identifying the Effects of Perceived Variables on Anticipated Commitment in a Merged Bank (은행합병성공에 영향을 미치는 잠재변수 규명을 위한 경로분석)

  • Sohn, So-Young;Park, Jeong-Hoon
    • IE interfaces
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    • v.12 no.4
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    • pp.506-513
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    • 1999
  • We use a path analysis to identify influential latent variables on employees' anticipated commitment to a merged bank. Survey samples are taken from Hanvit bank which is a merged form of Hanil and Sangup. Latent variables used in the path analysis are perceptions of organizational support, contact conditions, organizational unity, employee threat and organizational commitment. We find an interesting pre-merger group membership effect as well as merger pattern perceived by employees on the path for the anticipated commitment to the merged bank.

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The Main Path Analysis of Korean Studies Using Text Mining: Based on SCOPUS Literature Containing 'Korea' as a Keyword (텍스트 마이닝을 활용한 한국학 주경로(Main Path) 분석: '한국'을 키워드로 포함하는 SCOPUS 문헌을 대상으로)

  • Kim, Hea-Jin
    • Journal of the Korean Society for information Management
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    • v.37 no.3
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    • pp.253-274
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    • 2020
  • In this study, text mining and main path analysis (MPA) were applied to understand the origins and development paths of research areas that make up the mainstream of Korean studies. To this end, a quantitative analysis was attempted based on digital texts rather than the traditional humanities research methodology, and the main paths of Korean studies were extracted by collecting documents related to Korean studies including citation information using a citation database, and establishing a direct citation network. As a result of the main path analysis, two main path clusters (Korean ancient agricultural culture (history, culture, archeology) and Korean acquisition of English (linguistics)) were found in the key-route search for the Humanities field of Korean studies. In the field of Korean Studies Humanities and Social Sciences, four main path clusters were discovered: (1) Korea regional/spatial development, (2) Korean economic development (Economic aid/Soft power), (3) Korean industry (Political economics), and (4) population of Korea (Sex selection) & North Korean economy (Poverty, South-South cooperation).

The Research for Higher Ride Quality with OPAX and OTPA (변수모델을 사용한 전달경로분석법(OPAX)과 전달률 함수를 사용한 전달경로분석법(OTPA)을 사용한 승차감 향상 연구)

  • Shin, Kwangsoo;Choi, Sangill;Kim, Jongsik;Lee, Sangkwon;Im, Sebin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.1
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    • pp.65-73
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    • 2015
  • The ride quality has become a key component of not only design but car selling as the technology developed and the requirement of passengers grew up. Thus car industry invests lots of time and cost for the higher ride quality. The evaluation of the ride quality mainly is expressed by subjective element that drivers felt. In this paper, instead of the original transfer path analysis method, relatively new methods such as OPAX(Operational path analysis with eXogeneous inputs) and OTPA(operational transfer path analysis) are used for analyzing the main hindrance element of ride quality. With those new method, contribution rate of all paths that the vibration propagate along analyzed after driving test on the roads having different characteristic. The comprehensive hindrance elements of ride quality are deduced from the contribution rate and the improve experiment by changing one of hindrance elements for higher ride quality.

A New Analytical Representation to Robot Path Generation with Collision Avoidance through the Use of the Collision Map

  • Park Seung-Hwan;Lee Beom-Hee
    • International Journal of Control, Automation, and Systems
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    • v.4 no.1
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    • pp.77-86
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    • 2006
  • A new method in robot path generation is presented using an analysis of the characteristics of multi-robot collision avoidance. The research is based on the concept of the collision map, where the collision between two robots is presented by a collision region and a crossing curve TLVSTC (traveled length versus servo time curve). Analytic collision avoidance is considered by translating the collision region in the collision map. The 4 different translations of collision regions correspond to the 4 parallel movements of the actual original robot path in the real world. This analysis is applied to path modifications where the analysis of collision characteristics is crucial and the resultant path for collision avoidance is generated. Also, the correlations between the translations of the collision region and robot paths are clarified by analyzing the collision/non-collision areas. The influence of the changes of robot velocity is investigated analytically in view of collision avoidance as an example.

Transfer Path Analysis on the Passenger Car Interior Noise (승용차 실내소음의 전달경로 해석)

  • 지태한;최윤봉
    • Journal of KSNVE
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    • v.9 no.1
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    • pp.97-102
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    • 1999
  • Structure-borne noise is an important aspect to consider during the design and development of a vehicle. In this work. it was desired to identify the primary paths associated with structure-borne noise generated from the engine and front suspension. An experimental source-path-receiver model was used to characterize the system. A variety of primary sources such as engine. tires or exhaust system generate vibrations of the inner surfaces of the passenger compartment of a vehicle which subsequently radiate noise. The source was characterized by the force acting at the engine-to-body interface. and the path was characterized by pressure over force FRF's. The excitation forces were indirectly determined using dynamic stiffness of rubber mount or the system accelerance matrix. Through these analysis, path contribution diagram which is well expressed primary noise path is obtained.

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