• Title/Summary/Keyword: Vehicle damage

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Long-term condition monitoring of cables for in-service cable-stayed bridges using matched vehicle-induced cable tension ratios

  • Peng, Zhen;Li, Jun;Hao, Hong
    • Smart Structures and Systems
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    • v.29 no.1
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    • pp.167-179
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    • 2022
  • This article develops a long-term condition assessment method for stay cables in cable stayed bridges using the monitored cable tension forces under operational condition. Based on the concept of influence surface, the matched cable tension ratio of two cables located at the same side (either in the upstream side or downstream side) is theoretically proven to be related to the condition of stay cables and independent of the positions of vehicles on the bridge. A sensor grouping scheme is designed to ensure that reliable damage detection result can be obtained even when sensor fault occurs in the neighbor of the damaged cable. Cable forces measured from an in-service cable-stayed bridge in China are used to demonstrate the accuracy and effectiveness of the proposed method. Damage detection results show that the proposed approach is sensitive to the rupture of wire damage in a specific cable and is robust to environmental effects, measurement noise, sensor fault and different traffic patterns. Using the damage sensitive feature in the proposed approach, the metrics such as accuracy, precision, recall and F1 score, which are used to evaluate the performance of damage detection, are 97.97%, 95.08%, 100% and 97.48%, respectively. These results indicate that the proposed approach can reliably detect the damage in stay cables. In addition, the proposed approach is efficient and promising with applications to the field monitoring of cables in cable-stayed bridges.

A Basic Study on Vehicle Load Analyzing System for Embedded Road (임베디드 도로를 위한 차량하중 분석시스템 기초연구)

  • Jo, Byung-Wan;Yoon, Kwang-Won;Park, Jung-Hoon;Kim, Heoun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.1D
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    • pp.127-132
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    • 2011
  • Load managing method on road became necessary since overloaded vehicles occur damage on road facilities and existing systems for preventing this damage still show many problems. Accordingly, efficient managing system for preventing overloaded vehicles could be organized by using the road itself as a scale by applying genetic algorithm to analyze the load and the drive information of vehicles. First of all, accurate analysis of load using the behavior of road itself is needed for solving illegal axle manipulation problems of overloaded vehicles and for installing intelligent embedded load analyzing system. Accordingly in this study, to use the behavior of road, the transformation was measured by installing underground box type indoor model and indoor experiment was held using genetic algorithm and 10% error were checked.

The Effect of Antioxidant Vitamins on Liver Function Enzymes and Hepatic Damage of Aflatoxin $B_1$ treated mice (Aflatoxin $B_1$ 투여 마우스의 간 기능 효소 및 간 손상에 미치는 항 산화비타민의 효과)

  • Park, Seon-Ja;Park, Jung-Hyun;Park, Jong-Sun;Seo, Sook-Jae;Chung, Duck-Hwa
    • Journal of Korean Biological Nursing Science
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    • v.2 no.1
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    • pp.49-63
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    • 2000
  • Aflatoxin $B_1(AFB_1)$ is a potent hepatotoxic and hepatocarcinogenic mycotoxin in human beings. It is accumulated in animal tissues and injured cell through variable metabolic pathway. This study was conducted to determine the effect of antioxidant vitamins on liver function enzymes and hepatic damage of $AFB_1$ treated mice. The 6 weeks old male ICR mice were randomly separated 6 groups, vehicle solvent or vitamin C(10 mg/kg/day) and vitamin E(63.8 mg/kg/day) were administered by intraperitoneal(i.p.) injection and 1 hr later, vehicle solution(DMSO) or $AFB_1$(0.4 mg/kg) were injected. The results obtained as follow ; The levels of liver function enzymes such as GOT, GPT, LDH, and alkaline phosphatase, in sera of mice were remarkably elevated by treatment with $AFB_1$ only. However, those enzymes were significantly alleviated by co-treatment with antioxidant vitamins(p<0.01). Especially the levels of LDH and ALK phosphatase were similar to those of control groups(p<0.01). The transmission electron microscopy(TEM) image of intracellular microrganelles on the liver cell of mice was also degenerated extremely by treatment with $AFB_1$, but vitamin C and vitamin E gave good effects on cellular deformation. The intracellular microrganelles such as mitochondria, endoplasmic reticulum, nucleus and nucleic membrane were nearly disappeared the cellular deformation by antioxidant vitamins co-administration. With above results, we could estimated that antioxidant vitamins blocked AFB1 induced hepatic cell damage.

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Analysis of Acoustic Emission Signal for Vehicle CNG Tank Using Wideband Transducer (광대역 탐촉자를 이용한 자동차용 CNG 탱크의 음향방출 신호 분석)

  • Jee, Hyun-Sup;Lee, Jong-O;Ju, No-Hoe;So, Cheal-Ho;Lee, Jong-Kyu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.32 no.1
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    • pp.1-6
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    • 2012
  • This study is damage evaluation for CNG fuel tank during the burst test through the analysis of acoustic emission signals. Kaiser effect until the pressure 420 bar appears, but More than 420 bar by the creep effect appears significantly damaged vessels, and 480 bar pressure, the Kaiser effect of the rising phase was missing. Resonant transducer at 540 bar than 480 bar decreased activity such as energy and count Continually, but increased wideband transducer. In addition, through the rise time or frequency analysis of composite pressure vessels in order to observe the damage mechanisms wideband transducer is more effective than resonant transducer.

Design and Performance Evaluation of Surge Arrester for Loading in Railway Rolling Stock (전철 탑재용 피뢰기의 설계 및 성능평가)

  • Cho, H.G.;Han, S.W.;Lee, U.Y.;Kim, S.S.;Chang, T.B.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05a
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    • pp.74-77
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    • 2000
  • The main objective of this paper is to design and test a new type of polymer ZnO surge arrester for AC power system of railroad vehicles. Metal oxide surge arrester for most electric power system applications, electric train and must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of ZnO elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock. pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion. The main research works are focused on the structure design by finite element method, pressure relief of module, and studies of performance of surge arrester for electric railway vehicle.

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Photoprotective Effects of Soybean Extract against UV-Induced Damage in Human Fibroblast and Hairless Mouse Model

  • Cho, Young-Chang;Han, Jae-Bok;Park, Sang-Ik
    • Journal of Animal Reproduction and Biotechnology
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    • v.34 no.1
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    • pp.20-29
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    • 2019
  • Soy isoflavones have been reported to possess many physiological activities such as antioxidant activity and inhibition of cancer cell proliferation. This study investigated the photoprotective effects of soybean extract in human fibroblast cell line and hairless mice model. Human fibroblast was treated with soybean extract before and after ultraviolet B (UVB; 290-302 nm) irradiation. In the soybean extract treated group, the cells showed better resistance to ultraviolet (UV) than control group. The amount of type I collagen recovered from the soybean treated group was higher than the vehicle group exposed to UV-induced damage. Moreover, increased expression of metalloproteinases-1 as a result of UV irradiation was suppressed by the soybean extract. Female mice were orally administered soybean extract and irradiated with UVB light for 8 weeks. The effects of the soybean extract on the skin appearance, collagen deposition and epidermal thickness in the UV-damaged mouse skin were analyzed using histopathological methods. In soybean extract treated group, the skin had a better morphology than that of the control group. Furthermore, the amount of type I collagen was increased and overexpression of MMP-1 was reduced in the soybean extract group compared to vehicle group. Additionally, up-regulation of pro-inflammatory cytokines induced by UV irradiation was suppressed by dietary soybean extract treatment. It appears that soybean extract had a photoprotective effect, including anti-aging and anti-inflammatory effect, from UV-induced damage in not only human fibroblast, but also hairless mice. We confirmed that these effects were possibly due to promotion of collagen synthesis and inhibition of MMP-1 expression.

Vehicle Emergency Lamp Fuzzy Control Systems Using The GPS (GPS를 이용한 자동차 비상등 작동 장치)

  • Kwon, Yunjung;Nam, Sangyep
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.6
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    • pp.276-281
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    • 2014
  • Necessities of a traffic means work a car in the modern society human to an usability of a life is enjoying. On the other hand, the damage by traffic accident increment the human quotient worked as we were in proportion to the vehicle which increased. Passing an examination moves necessarily on an obstacle to suddenly appear at the fronts if a car travels and the vehicles which stopped suddenly. Dynamic passing an examination about an obstacle turn on Vehicle Emergency Lamp to by hand when is unhurried, and can turn off, but to appear urgently dynamic passing an examination in time human is instinctive, but cannot inform an emergency to a back vehicle, and a rear-end collision occurs. A car we synthesize a speed of a vehicle, and this unit analyzes as we use GPS, and to drive runs Vehicle Emergency Lamp to automatic in the situations that shall turn on emergencies etc. If a speed of a vehicle continuously slows down in too high-speed driving or low-speed driving, or we are stopped, Vehicle Emergency Lamp is always turned on. It was built if we rise again as clearing itself from risk, and a speed of a vehicle judges, and we turn off Vehicle Emergency Lamp to automatic. It runs till rear-end collision sensor operates, and by hand reset does Vehicle Emergency Lamp a driving vehicle collides from behind to a back vehicle or when a driving vehicle was overthrown. It is shortened very much to the chain rear-end collision traffic accident that is a traffic accident of large size if we use this unit. And we did authentication through the experiment which a driver was helpful to unnecessary operation and a relaxed safe driving during drivings.

The Investigation of disaster damage using digital cameras (디지털 카메라를 이용한 재난피해정보 추출)

  • Kim Gi-Hong;Kim Hyung-Kyung;Hong Sung-Chang
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • 2006.05a
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    • pp.152-157
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    • 2006
  • Satellite imagery is generally used for investigating the damage from natural disaster for wide area and remotely piloted vehicle or aerial photos are used for the local damage. But for more detailed information such as damages of public facilities, these methods are inadequate and so in this case field surveying has been carried out. We tried to estimate the damage of public facilities faster and more accurately using photogrammetric method. We developed a digital stereo camera system by fixing two digital cameras on a frame, and with this system the photos of actually damaged areas were collected. The damages were estimated from these stereo photos. Then the estimated data was compared with field surveying data in order to verify our system.

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The fatigue analysis using cumulative damage rule (Miner's rule) for the welding areas of carbody structure (누적손상법(Miner's rule)을 이용한 철도차량 차체 용접부의 피로평가)

  • Kim, Kwang-Woo;Park, Geun-Soo;Park, Hyung-Soon
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.30-34
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    • 2007
  • Structural integrity of railway vehicles should last for a long period against various and continuous fatigue loadings, and the carbody structures of railway vehicle are manufactured by applying multiform welding types for each material. Since the most of cracks are occurred and proceeded at the vicinity of welding area during the lifetime of carbody structure, the fatigue strength evaluation for welding area of carbody structure should have been carried out. Rotem Company has evaluated lifetime and fatigue strength of carbody structure according to the fatigue analysis based on the international standard and/or inner-official regulation. This study introduces the fatigue analysis method that we have evaluated and calculated the damages for the welding areas of carbody structure under various fatigue loading conditions using cumulative fatigue damage rule(Miner's rule) to verify whether the cumulative damage does exceed unity. This study contains the fatigue test of specimens to derive stress-life relations(S-N curve), sub-modeling analysis and the calculation of cumulative damages under fatigue loading. The fatigue analysis verifies the welding area shall be capable of withstanding under fatigue loading, identifies how critical area shall be selected and presents the principles to be used for design verification.

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A Study on Low-Velocity Impact Characterization of Various Sandwich Panels for the Korean Low Floor Bus Application (초저상 버스 차체 적용을 위한 샌드위치 패널들의 저속충격 특성 연구)

  • Lee, Jae-Youl;Lee, Sang-Jin;Shin, Kwang-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.4
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    • pp.506-516
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    • 2007
  • In this paper, a study on low-velocity impact response of four different sandwich panels for the hybrid bodyshell and floor structure application of the Korean low floor bus vehicle was done. Square samples of 100mm sides were subjected low-velocity impact loading using an instrumented testing machine at six energy levels. Impact parameters like maximum force, time to maximum force, deflection at maximum force and absorbed energy were evaluated and compared for four different types of sandwich panels. The impact damage size and depth of the permanent indentation were measured by 3-Dimensional Scanner. Failure modes were studied by sectioning the specimens and observed under optical microscope. The impact test results show that sandwich panel with composite laminate facesheet could not observe damage mode of a permanent visible indentation after impact and has a good impact damage resistance in comparison with sandwich panel with metal aluminum facesheet.