• Title/Summary/Keyword: Heavy-load

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Analysis on the increasing loss in Temperature rise test of induction motor by equivalent load method (등가부하법에 따른 유도기 온도상승 시험시 발생 증분 손실 해석)

  • Park, J.T.;Lee, J.I.;Kim, K.O.;Kwon, J.L.;Kwon, B.H.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1045-1046
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    • 2007
  • As equivalent load method of induction motor, even without connecting load, for temperature rise test has been acknowledged economic and corrective method, the method has been widely used instead of the real load method, and also international standards IEC 61986 is published in 2002. ABB, an well-known and famous electric machinery maker in the world, has been already applying the equivalent load method since 2002. HHI has been using real load method and equivalent load method for temperature rise of induction motor, it is already known that the equivalent test results is higher as $1-5^{\circ}K$ than that of real load test. But, quantity analysis for the reason of the temperature rise is not satisfied sufficiently. So, in this paper, quality analysis and also quantity analysis was conducted.

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Structural Analysis on the Heavy Duty Diesel Engine with Compacted Graphite Iron (CGI를 이용한 대형 디젤엔진의 구조해석)

  • Lee, Jae-Ok;Lee, Young-Shin;Lee, Hyun-Seung;Kim, Jae-Hoon;Jun, Joon-Tak;Kim, Chul-Goo
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.602-607
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    • 2007
  • The heavy duty diesel engine must have a large output for maintaining excellent mobility. The compacted graphite iron (CGI) is a material currently under study for the engine demanded for high torque, durability, stiffness and fatigue. In this study, three dimensional finite element model of a heavy-duty diesel engine was developed to conduct the stress analysis by using property of CGI. The FE model of the heavy duty diesel engine section consisting with four half cylinder was selected. The heavy duty diesel engine section include cylinder block, cylinder head, liner, bearing cap, bearing and bolt. The loading conditions of engine are pre-fit load, assembly force and gas force.

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Structural Analysis on the Heavy Duty Diesel Engine and Optimization for Bearing Cap (대형 디젤엔진의 구조응력해석 및 베어링 캡의 최적설계)

  • Lee, Jae-Ok;Lee, Young-Shin;Lee, Hyun-Seung;Kim, Jae-Hoon;Jun, Joon-Tak;Kim, Chul-Goo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.5
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    • pp.402-410
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    • 2008
  • The heavy duty diesel engine must have a large output for maintaining excellent mobility. In this study, a three dimensional finite element model of a heavy-duty diesel engine was developed to conduct the stress analysis. The FE model of the heavy duty diesel engine main parts consisting with four half cylinder was selected. The heavy duty diesel engine parts includes with cylinder block, cylinder head, gasket, liner, bearing cap, bearing and bolts. The loading conditions of engine were pre-fit load, assembly load, and gas load. As the results of structural analysis, because the stress values of cylinder block and bearing cap did not exceed the basic design can be satisfied. But on the part which contacts with cylinder block and bearing cap the stress value exceeds the allowable strength of material. In order to decrease the stress at that part, it was optimized with parametric study.

Induction Motor with Adjustable Windings for High Efficiency Drive in Light Load Operation

  • Zhang, Y.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.508-513
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    • 2014
  • Heavy load start but light load operation is a common case in practical drive applications. When an induction motor is employed for such applications, its rated power is usually chosen according to the heavy load start. Then, during light load operation, its efficiency and power factor are low. To solve this problem, it is proposed to adjust the motor windings from the startup to the normal operation conditions. In this paper, arrangement of the adjustable windings is introduced, air gap field with different windings is investigated, and steady state operation performance under various loads is examined. It can be seen that by using proper winding arrangement both startup and operation performances are satisfactory.

Optimal Design Analysis of Driving Link-Mechanism and Development of Control Performance Estimation Program for Unbalance Heavy-Load Elevation Driving System; (구동 링크기구 최적설계 분석 및 불균형 대부하 고저 구동/제어 성능추정 프로그램 개발)

  • 최근국;이만형;안태영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.614-617
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    • 1995
  • The unbalance heavy-load elevation driving systems are composed of rotating link-mechanism and hydraulic cylinder which actuates elevation and compensates the static unbalance moment of supporting mechanism. Control and compensation of gun driving is very difficult because these mechanism imply highly nonlinearities due to hydraulic fluid characteristics and mechanical rotation of link-mechanism. In this study, through the analysis of manufactured link-mechanism, the optimal link-mechanism design of the elevating system is suggested. Also to estimate the control performance of the unbalance heavy-load elevation servo-control driving system, modeling and simulation of the system are carried out. To prove the reliability of performance estimation program,simulation results are compared with the experimental results. Both results are similar, therefore this program will be helpful to study the control performance improvement of the system.

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A Study on the Reducing Method of Stray Load Loss in Induction Motor (표류부하손 저감형 유도전동기 설계기술)

  • Lee, J.L.;Kim, K.W.;Kwon, J.L.;Kim, B.H.;Kim, J.O.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.927-929
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    • 2005
  • In this paper, through the theoretical study on reducing method and analysis of stray load loss of induction motor, we suggest the improved design considering the slot combination, skew, air gap and manufacturing method. For verifying the suggested design, the test was performed by IEEE 112. As a result, the reducing technology on the stray load loss was established.

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Structure and Strength Analysis of Scissors Boom of Heavy Load Transporter through Finite Element Analysis (유한요소해석을 통한 중량물 이동대차 시저스붐의 구조 및 강도 해석)

  • Hyeon-Ho Lim;Chang-Min Yang;Kwon-Woong Choi;Dae-Woo Choi
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.46 no.spc
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    • pp.61-67
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    • 2023
  • Special equipment used for snow removal is only used in the winter and must be moved into storage during non-winter seasons. However, when moving heavy equipment using a forklift within a limited space, safety accidents may occur due to deformation and damage due to the worker's limited visibility and excessive loading of heavy objects. In this study, the scissors boom of the developed heavy load transporter was conducted in two cases: link structural analysis and position-based structural analysis. In detail, the link structural analysis covers four cases of stress and safety factor according to material and thickness to optimize the specifications of the material selected during development, and the structural analysis according to position covers two cases before and after the lift, when maximum stress concentration is achieved. Safety was evaluated through finite element analysis. As a result of the study, when manufacturing a scissors boom type heavy load transporter that can withstand a load of 10 tons, the link showed safety at SS400 4.5mm or higher, and reinforcement is needed in the upper and lower structures, so it is judged to be useful in applying materials according to the load.

Fatigue analysis of helideck structures (헬리데크 구조물의 피로해석)

  • Jeon, Sangik;Oh, Simkwan;Roh, Jisun;Kim, Bongjae;Jang, Kibok
    • Special Issue of the Society of Naval Architects of Korea
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    • 2015.09a
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    • pp.63-68
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    • 2015
  • This paper presents fatigue analysis of helideck structures located in FPSO. After FPSO is moved to the target position where production of resource is performed, FPSO stays at the target position and performs production of resource, storage and off-loading during the design life. Helideck structure is located in FPSO essentially for the movement of personnel and life rescue at emergency situations by using helicopters. Because inertial load induced by FPSO motion and landing and taking-off load of helicopter occur at helideck structures cyclically, helideck structures should be designed to withstand fatigue loads. Therefore, The fatigue assessment of helideck structures should be performed with fatigue loads. Effect of stress concentration due to misalignment between welded plates is considered in fatigue assessment additionally.

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A Study on the Structural Safety Analysis for Vinyl House at Wind Load (비닐하우스의 풍하중 구조안전성 검토에 관한 연구)

  • Paik, Shinwon
    • Journal of the Korean Society of Safety
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    • v.34 no.5
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    • pp.72-77
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    • 2019
  • Vinyl house consists of main rafter, lateral member, clamps and polyethylene film. Many vinyl houses are used to grow fruits, flowers and vegetables in the countryside. Due to climate change, vinyl houses are often destroyed by strong winds or typhoons in summer. Many farmers suffer great economic damage from the collapse of vinyl houses. So it is very important to build a safe vinyl house and find a method to withstand this heavy wind load. In this study, a structural analysis was performed on four types of vinyl houses(10-single-4, 10-single-6, 10-single-7, 10-single-10). In addition, axial force and flexural moment are obtained from the structural analysis of four types of vinyl house. For these four types of vinyl house, structural safety was reviewed by obtaining the combined stress ratio by the strength design method. This structural review showed that the specifications for the vinyl house proposed in the design are not safe. Especially, the result of structural analysis for four types of vinyl house showed that the vinyl house structure constructed as a standard was a very dangerous structure. Therefore, it is necessary to devise diverse methods in order to make vinyl houses structurally safe for heavy wind load in the future. Also a variety of manual development is needed to prevent the collapse of vinyl houses at heavy wind load.

Evaluation of Permit Vehicle Weight for Simple Girder Bridges (단순거더교의 중차량 통과허용하중 설정에 관한 연구)

  • Kim, Sang-Hyo;Yang, Nam-Seok;Kim, Jong-Hak;Juhn, Gui-Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.4 no.4
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    • pp.211-218
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    • 2000
  • Many bridges are severely damaged by the overloaded heavy vehicle and the trend will become more serious because the traffic volume is continuously increasing. Currently, the vehicles with gross weights over 40 tonf or axle weight over 10 tonf are not allowed on the public road. However, this regulation is not based on a systematic study on the bridge capacity and assumed to be much too conservative depending on the vehicle types and bridge types. In this study, the permit weights of heavy vehicles of diverse axle spacings and axle load distribution are calculated considering the structural characteristics of bridge superstructures. In order to consider the various load effects of heavy weight vehicle crossings, three conditions are considered in the calculation of permit vehicle load. From the results, the permit vehicle weights of the simple girder bridges are calculated.

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