• Title/Summary/Keyword: 차량 안정성

Search Result 561, Processing Time 0.033 seconds

The Experimental Study on Transverse Field Joint Method of Precast Road Deck Slab of Double Deck Tunnel in Great Depth (대심도 복층터널 프리캐스트 중간슬래브의 횡방향 현장이음방식에 대한 실험연구)

  • Lee, Doo-Sung;Kim, Bo-Yeon;Bae, Chul-Gi;Hur, Jae-Hun
    • Journal of the Korea Concrete Institute
    • /
    • v.29 no.1
    • /
    • pp.23-32
    • /
    • 2017
  • The joints between precast PSC slabs of the intermediate road slab in double deck tunnel are inevitably generated in the road traffic vehicle traveling direction. Therefore, it is important to make the behavior of parts on the joint in one piece. The imtermediate road slab system of double deck tunnel in great depth proposed in this study will be constructed with precast PSC slab in order to minimize the construction period. And the joint connection between the precast slab has been developed in two methods: the 'Transverse tendon reinforcement method' and 'High strength bolts connection method'. Also, the experiments were performed for the full scale model in order to evaluate the performance of the intermediate road deck slab with two type joints systems, the structural stability was verified through the F.E.M analsysis. The results of static loading test and F.E.M analysis investigated a very stable behavior of intermediate road deck slab in double deck tunnel applying the joint methods developed in this study, in the cracks and deflections to satisfy the design standards of Highway Roads Bridges (2011), it was determined that there is no problem even servicebility.

A Study on Dress-up Turning as Means of Expressing Automobile Drivers' Self-identity (자동차 사용의 정체성 표출 수단으로서의 드레스업 튜닝에 대한 고찰)

  • 이호숭
    • Archives of design research
    • /
    • v.11 no.3
    • /
    • pp.219-228
    • /
    • 1998
  • As automobile drivers' desires become ever diversified with the spreading phenomenon of 'characteristic automobile decorations', it is feared that the design quality may be deteriorated, while the safety be retarded in terms of performance and function. In Korea, the 'Dress-up tuning' becomes the source of the social criticism because of lack of relevant codes and professional tuning services, while automobile drivers are excessively having their automobiles overdressed ignoring the overall aesthetic aspect and functions. Under such a circumstance, this study was aimed at reviewing the practices and dress-up accessories by each automobile part of those foreign automobile makers and professional tuners who have introduced the concept of 'customizing' and developed dress-up accessories and various tuning parts only to satisfy their customers' tuning needs. It is anticipated that automobile styling would tend more to pursue a 'coordination' featuring ordinary consumers' individualistic senses, while customers' needs reflecting their life styles be more refined. Meanwhile, Korean automobile consumers have accommodated the product designs : presented within the producers' frameworks, but they are expected to pursue the design values varying according to changing structures of production, society and industry as well as the resultant design activities. In all, makers and designers are requested to be aware of such changing environment structures and thereby, explore other alternatives, or reflect seriously on the socio-cultural implications inherent in the products, namely on the production and consumption of people's favorites.

  • PDF

Development of the Traffic Signal Control Strategy and Signal Controller for Tram (트램 운영을 위한 신호제어 전략 및 신호제어기의 개발)

  • Lee, In-Kyu;Kim, Youngchan;Lee, Joo Il;Oh, Seung Hwoon
    • Journal of Korean Society of Transportation
    • /
    • v.33 no.1
    • /
    • pp.70-80
    • /
    • 2015
  • In recent years, tram has been the focus of a new mode of public transportation that can solve traffic jams and decrease public transit usage and environmental problem. This research is in the works to develop a tram signal controller and signal control strategies, and aim to resolve the problem of what could happen if a tram system was installed in general road. We developed the hierarchical signal control strategies to obtain a minimum tram bandwidth and to minimize vehicle delay, in order to perform a priority control to include passive and active signal priority control strategies. The strategies was produced for S/W and H/W, it is based in standard traffic signal controller. We conducted a micro simulation test to evaluate the hierarchical signal control strategies, which showed that the developed optimization model is effective to prevent a tram's stop in intersection, to reduce a tram's travel time and vehicle's delay.

Development of the Calorimeter to Measure Heat Rate Generated from Battery for EV & HEV (전기자동차용 축전지의 발열량 측정을 위한 열용량계 개발)

  • Yang Cheol-Nam;Park Seong-Yong
    • Journal of the Korean Electrochemical Society
    • /
    • v.2 no.4
    • /
    • pp.218-220
    • /
    • 1999
  • The performance of the Electric Vehicle and Hybrid Electric Vehicle depends on that of the battery pack composed of series connected batteries. And thermal property is one of the main factors which decide the performance of the battery pack. So heat generation rate from the battery under the various driving mode must be measured as precise as possible because thermal characteristics of the battery affect the driving performance and battery pack's life cycle. Besides, to design and develop the battery thermal management system for the EV and HEV, the measurements of the thermal properties of the batteries are needed. However, the established calorimeter is not adequate to test an EV's battery because its cavity is too small to accommodate the EV's battery. Therefore we developed the calorimeter to test the thermal property of the EV's battery. Its cavity size is 120mm long, 75mm wide and 200mm high. The calorimeter is calibrated by the dummy cell which generates the heat rate from zero to 200W. The measuring accuracy of the calorimeter is within $2\%$ and its voltage stability is 2.5mV in the constant temperature bath.

A Study on Selective Catalytic Reduction on Diesel Particulate Filter Catalyst and Coating Technology the Removal of Particulate Matters and NOx for Old Special Cargo Vehicles (노후 특수·화물 차량 PM/NOx 저감을 위한 SDPF 촉매 및 코팅 기술 연구)

  • Jeong, Kwanhyoung;Seo, Philwon;Oh, Hungsuk;Kim, Jongkook;Kang, Soyeon;Kang, Jeongho;Kim, Hyunjun;Shin, Byeongseon
    • Applied Chemistry for Engineering
    • /
    • v.32 no.6
    • /
    • pp.695-699
    • /
    • 2021
  • In this study, Selective Catalytic Reduction on Diesel Particulate Filter (SDPF) after-treatment system was introduced to simultaneously remove NOx and Particulate Matters (PM) emitted from trucks and special cargo vehicles using old engine. First, in order to select an Selective Catalytic Reduction (SCR) catalyst for SDPF, the de-NOx performance of V/TiO2 and Cu-Zeolite catalysts were compared, and the SCR catalyst characteristics were analyzed through Brunauer Emmett Teller (BET), X-ray Diffraction (XRD) and NH3-TPD (Temperature Programmed Desorption). From the activity test results, the Cu-zeolite catalyst showed the best thermal stability. For optimal coating of SDPF, slurry was prepared according to the target particle size. From the coating stability and back pressure test results of SDPF according to the amount of SCR coating, As a result of comparing coating stability, back pressure, and de-NOx performance by producing A, B, and C samples for each loading amount of the SDPF catalyst, the best results were found in the B sample. The engine dynamometer test was conducted for the optimal SDPF after-treatment system, and the test results satisfied Eu-5 regulations.

Suggestion of user-centered public transportation value evaluation system and applied research in Jeju area (이용자 중심 대중교통 가치평가 체계제안과 제주지역 적용 연구)

  • Hwang, Kyung-Soo;Yang, Jeong-Cheol;Jo, Hang-Woo;Lee, Gwan-Hong
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.2
    • /
    • pp.622-631
    • /
    • 2019
  • The purpose of this study is to establish and apply a public transport valuation system to form required policy for institutionalization. Over the past six years, Jeju has seen a steady increase in the number of cars owned by its population. Also, as the number of tourists has changed from group to individual tourists, the rate of rental car use has increased rapidly. As a result, road congestion in Jeju city is becoming as crowded as Seoul., Jeju Island is said to have created a foundation for faster, more convenient, and cheaper use of transportation through the reorganization of the public transportation system in August 2017. This is also reflected in the Public Transportation Value Assessment. Jeju residents were in favor of strengthening public transportation priority policy. In addition, public transport valuations are highly valued in the order of public transportation fares, public transportation stability, public transportation policies for the common people, public transportation policies for the vulnerable, public transportation policies for residents, environmentally-friendly policies, and public transportation to help ease traffic congestion. This is because public transportation has a wide range of values and should refine the factors that local governments use to evaluate policy. These methods need to be institutionalized and actively utilized through the establishment of a value assessment system for public transport.

Control of Inertially Stabilized Platform Using Disturbance Torque Estimation and Compensation (외란토크 추정 및 보상을 이용한 관성안정화 플랫폼의 제어)

  • Choi, Kyungjun;Won, Mooncheol
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.40 no.1
    • /
    • pp.1-8
    • /
    • 2016
  • In this study, we propose a control algorithm for Inertially Stabilized Platforms (ISP), which combines Disturbance Observer (DOB) with conventional proportional integral derivative (PID) control algorithm. A single axis ISP system was constructed using a direct drive motor. The joint friction was modeled as a nonlinear function of joint speed while the accuracy of the model was verified through experiments and simulation. In addition, various Q-filters, which have different orders and relative degrees of freedom (DOF), were implemented. The stability and performance of the ISP were compared through experimental study. The performance of the proposed PID-plus-DOB algorithm was compared with the experimental results of the conventional double loop PID control under artificial vehicle motion provided motion simulator with six DOF.

Performance characteristics of AGM lead acid battery with the content of positive plate incorporating nano-size additive material (나노 사이즈 입자가 포함된 양극 활물질 함량에 따른 차량용 AGM 연축전지 성능 특성)

  • Lim, Tae Seop;Kim, Sung Jun;Kim, Sang Dong;Yang, Seung Cheol;Jung, Yeon Gil
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.30 no.4
    • /
    • pp.123-130
    • /
    • 2020
  • Nano seed incorporated in micro-sized 4BS (Tetrabasic lead Sulfate) seed was applied to the positive electrode active material and compared with Nano 4BS seed (NS). The dispersion of NS decreased due to the aggregation phenomenon, while the nano seed incorporated in micro-sized 4BS seed (INS) could confirm excellent dispersion. As the content of INS increased, the particle size of the active material became small and constant, which was confirmed through SEM and particle size analysis. The specific surface area for the reaction was increased and the high-rate discharge and lifetime characteristics were improved. In order to confirm the variation in particle size distribution in the plate manufacturing process, internal resistance and voltage were measured for 200 AGM lead-acid batteries, and it was confirmed that batteries quality variation decreased.

Design and Fabrication of X-band Wideband Array Antenna for SAR Applications (SAR를 위한 X-band 광대역 배열 안테나의 설계 및 제작)

  • Won Young-Jin;Lee Young-Ju;Kong Young-Kyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.17 no.2 s.105
    • /
    • pp.184-192
    • /
    • 2006
  • Synthetic Aperture Radars(SAR) are used mainly for high-resolution imaging of the terrain. This paper describes the $16{\times}16$ array antenna designed for an X-band, automobile-based SAR(AutoSAR) system. This antenna has the structure of several layers such as radome, radiators, slots, feed network, and honeycomb cores. Each layer is adhesively bonded to meet different combination of structural and electrical design requirements. Using the Strip-Slot-Foam-Inverted-Patch(SSFIP) structure and honeycomb cores, a wide bandwidth and a structural hardness were achieved. Measurement results were compared with simulation results. It was observed that this antenna had a bandwidth of 1.7 GHz, side-lobe levels of less than -20 dB, half-power beamwidth of $5^{\circ}$ and $5^{\circ}$, and gains of 25.0 dBi. The observed results show that the designed array antenna will be applicable to the wideband SAR system.

Analysis of Abnormal Vibration by a Damper Clutch Operation in Low Speed Ranges of A/T Vehicles (A/T차량의 저속 영역에서 댐퍼클러치 작동에 따른 이상 진동 해석)

  • Shin, Changwoo;Kim, Beomsoo;Lee, Daeheung;Jeong, Jongryeol;Lim, Wonsik;Cha, Sukwon
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.21 no.3
    • /
    • pp.157-164
    • /
    • 2013
  • A damper clutch in automatic transmission systems has some advantages of fuel economy and dynamic performance. Although a damper clutch operation improves a fuel economy of the vehicles, a positive operation of a damper clutch in a low vehicle speed induces abnormal vibration. This paper analyzed one of reasons for abnormal vibration by a damper clutch operation in low engine speed ranges. A simulation model was designed to confirm the effects of a damper clutch operation under unstable regions of an engine. A theoretical analysis was carried out about an engine operation stability. Simulation was conducted to depict abnormal vibration by a damper clutch operation in unstable regions of an engine performance curve. The effects of an engine operation region for abnormal vibration by a damper clutch was investigated according to the range and the slope of unstable regions. As a result of simulations, a damper clutch operation would be better to avoid an engine unstable regions.