• Title/Summary/Keyword: deadweight

Search Result 73, Processing Time 0.022 seconds

A Study on the Building a Model of Ship's Voyage Profit Evaluation Formula and its Application (선박운항수익 Model화와 응용에 관한 연구)

  • 양시권;김순갑
    • Journal of the Korean Institute of Navigation
    • /
    • v.5 no.2
    • /
    • pp.89-98
    • /
    • 1981
  • Presently, there are some means of voyage estimations such as Hire base, Charter base, and Anticpated income and expenditure statement of voyage. The former two are the means of estimation for profit of a ship's voyage per a deadweight tonnage adn a month, and it is well used in the case of chartered ships. But it is somewhat meaningless for the shpowner who runs his ships for himself. The latter means for estimation is mainly used in western shipping, and do not set forth simpler way of comparing profit with another voyage or with another ship's employing in other route. And this paper has yielded an index of ship's voyage profit evaluation by building a model of ship's voyage evaluation formula, and the index may be used in evaluation of the new investigation of shipping as well as setting out a shiop in a voyage. The model has yielded a break even curve which may be used for deciding the amount of demurrage and the period of ship's port time for a specific voyage contraction.

  • PDF

Optimal Design for Weight Reduction of Magnet Over Head Crane by using Taguchi method (다구찌법을 이용한 마그네트 천장크레인의 경량화를 위한 최적설계)

  • 홍도관;최석창;안찬우
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.20 no.3
    • /
    • pp.50-57
    • /
    • 2003
  • In this study, the structural optimal design was applied to the girder of over head crane. The optimization was carried out using ANSYS code fur the deadweight of girder, especially focused on the thickness of its upper, lower, reinforced and side plates. The weight could be reduced up to around 15% with constraints of its deformation, stress and buckling strength. The structural safety was also verified by the buckling analysis of its panel structure. It might be thought to be very useful to design the conventional structures fur the weight save through the structural optimization. The objective function and restricted function were estimated by the orthogonal array, and the sensitivity analysis of design variable fur that was operated.

Application of Multiple Regression Method to Prediction of Noise Level in Ship Cabins (회귀분석법에 의한 선박 소음 예측에 관한 연구)

  • Dong-Hae Kim;Kyoon-Yang Chung
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.31 no.3
    • /
    • pp.112-118
    • /
    • 1994
  • In this paper, statistical approach to prediction of A-weighted noise level in ship cabins. based on multiple linear regression analysis, is conducted. The best regression formula is composed of seven parameters of the deadweight, the type of ship, the location of engines and cabins, the type of deckhouse and the propeller skew angle. Verification work was carried out with other 210 cabins' data in 6 ships. As a result, the formula ensures the accuracy of 3 dB(A) in 77 % of cases.

  • PDF

A study of Analysis for 150K DWT Class Bulk carrier(BC-B type) (BC-B Type150K DWT Class Bulk carrier 구조적 특성에 관한 고찰)

  • Seo, Hyang-Duk;Kim, Do-Koon;Ahn, Hyung-Joon
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2015.09a
    • /
    • pp.79-84
    • /
    • 2015
  • A BC-B type bulk carrier is rarely built, so the structural characteristics is not reported and familiar so far. The biggest difference between BC-B and BC-A type vessel is applying alternate cargo loading, which density is over $1.0ton/m^3$. In this paper, 150K DWT class BC-B type bulk carrier is calculated and compared with BC-A type vessel, which has same condition such as main dimension and deadweight, about prescriptive rule and FEA based on CSR. And aspect ratio of target vessel is smaller than typical capsize bulk carrier, so 150K and 180K bulk carrier, which applied BC-A type, are also compared to find feature of wide beam vessel.

  • PDF

Development and Application of Draft Reading System Based on Image Processing (영상처리 기반의 Draft Reading System 개발 및 적용)

  • Han, Young-Soo;Lee, Jeong-Hwan;Baek, Jun-Myung;Kang, Dae-Youl;Park, Jun-Heum;Yoo, Hyun-Woo
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2015.09a
    • /
    • pp.14-19
    • /
    • 2015
  • Since CAD is advertised 1980s, all across industries have been changed through engineering, manufacturing and inspection. Also marine industry has adopted not only CAD but also various IT systems to make productivity higher. This paper includes research and development to improve traditional draft reading by using IT system, it has focused to build draft database for new vessels, to improve robustness measuring weather condition and to reduce accident possibility.

  • PDF

A Study for The Optimal Detail on Intersectin of Longitudinal-Transversal Rib in Orthotropic Steel Deck Bridge, Bulkhead Plate Reinforced. (벌크헤드 플레이트로 보강된 강바닥판교의 종리브-횡리브 교차연결부의 최적상세 연구)

  • 공병승;윤성운
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • 2004.04a
    • /
    • pp.177-184
    • /
    • 2004
  • Orthotropic steel deck bridge has much advantages such as the light deadweight, so the construction of orthotropic steel deck is profitable for the long-span bridges Although the system has a lot of merits, it happens some damages by the traffic density and the fatigue cracks of welding. The cross-connection of longitudinal rib and transversal rib is one of the weakest at the fatigue. The secondary stresses which are from the out-plane deformation of transversal rib and the torsion of longitudinal rib make the topical stress concentration phenomenon. The Bulkhead Plate for prevention of this stress concentration phenomenon was applied by changing the orthotropic steel deck of Williamsburg bridge in USA. But, it is principle that a Bulkhead Plate is not established in the domestic design standard. Therefore, it is estimated that the study for installation of Bulkhead Plate is needed. This study with considering these circumstances proves efficiency of Bulkhead Plate and will be presented optimal design details through finite element analysis according to change the geometrical of Bulkhead Plate and the cross-connection area of longitudinal and transversal rib

  • PDF

A Study on the Correlation between Shiphandler's Subjective Evalution and Maneuvering Risk in Curved Narrow channel (굴곡된 협수로 통항에서 조선자의 주관적 위험감지도와 조종위험도와의 상관 관계에 관한 기초 연구)

  • 이동섭;윤점동;정태권
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.2 no.S1
    • /
    • pp.63-73
    • /
    • 1996
  • The assesment of the safety of ship's transit in a curved narrow channl consists of the maneuvering safety determined by the chance of running aground, the maneuvering difficulty determined by shop's workload, and shiphandler's subjective evaluation. In this study to examine the correlation between shiphandler's subjectice evaluation and the maneuvering risk, the real-time and full-mission shiphandling simulator in the Korean Marine Training & Research Institutes(KMTRI) was utilized. In the conning bridge of the shiphandling simulator, 50 experienced masters conducted masters conducted the modeled vessel of 60,000 deadweight tonnage along the designed channel under 3 different envrinmental conditions. The findings were as follows: (1) The frequencies of stress levels, work difficulties, vessel controllability and overall workload of shiphandlers are similar irrespective of environmental conditions and they are able to be represented as shiphandler's subjective evaluation. (2) It is possible to assess and analyze theoretically the correlation between the shiphandler's subjective ecaluation and maneuvering risk each environmental cindition by quantifying the data obtioned from the tests. The results are as follows: ① As the degree of maneuvering risk increases, the shiphandler's subjective evaluation increases sharply near the curvature area of the desgined channel. ② In the area of the curvature of the designed channel, maneuvering risk increases sharply with the danger of running aground under the environmental condition of current and wind comung from the stem.

  • PDF

Dynamic analysis and shear connector damage identification of steel-concrete composite beams

  • Hou, Zhongming;Xia, He;Zhang, YanLing
    • Steel and Composite Structures
    • /
    • v.13 no.4
    • /
    • pp.327-341
    • /
    • 2012
  • With the advantages of large span, light deadweight and convenient construction, the steel-concrete composite beam (SCCB) has been rapidly developed as a medium span bridge. Compared with common beams, the global stiffness of SCCB is discontinuous and in a staged distribution. In this paper, the analysis model for the simply-supported SCCB is established and the vibration equations are derived. The natural vibration characteristics of a simply-supported SCCB are analyzed, and are compared with the theoretical and experimental results. A curvature mode measurement method is proposed to identify the shear connector damage of SCCB, with the stiffness reduction factor to describe the variation of shear connection stiffness. By analysis on the $1^{st}$ to $3^{rd}$ vertical modes, the distribution of shear connectors between the steel girder and the concrete slab are well identified, and the damage locations and failure degrees are detected. The results show that the curvature modes can be used for identification of the damage location.

Analytical Structural Integrity for Welding Part at Piping Penetration under Seismic Loads (지진하중이 적용되는 배관 관통부의 용접에 대한 구조 건전성 해석)

  • Choi, Heon-Oh;Jung, Hoon-Hyung;Kim, Chae-Sil
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.13 no.1
    • /
    • pp.23-29
    • /
    • 2014
  • The purpose of this paper is to assess the structural integrity of piping penetrations for nuclear power plants. A piping qualification analysis describes loads due to deadweight, pressure difference acts normal to the plate, thermal transients, and earthquakes, among other events, on piping penetrations that have been modeled as an anchor. Amodel was analyzed using a commercial finite element program. Apiping penetration analysis model was constructed with an assembly of pipe, head fittings and sleeves. Normally, the design load, thus obtained, will consist of three moments and three forces, referred to a Cartesian coordinate system. When comparing the stress analysis results from each required cutting position, the general membrane stress intensities and local membrane plus bending stress intensities during a structural evaluation cannot exceed the allowable amount of stress for the design loads. Therefore, the piping penetration design satisfies the code requirements.

Seismic Integrity Analysis of an Electric Distributing Board Using the Response Spectra Analysis Method (응답스펙트럼해석법을 이용한 배전반의 내진건전성 해석)

  • Choi, Young-Hyu;Kim, Soo-Tae;Seol, Sang-Seok;Moon, Sung-Choon
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.19 no.4
    • /
    • pp.45-51
    • /
    • 2020
  • In this study, a response spectrum analysis of an electric distributing board (EDB) was conducted to investigate seismic integrity in the design stage. For the seismic analysis, the required response spectra of a safe shutdown earthquake with 2% damping (RRS/SSE-2%) specified in GR-63-CORE Zone 4 was used as the ground spectral acceleration input. A finite element method modal analysis of the EDB was also performed to examine the occurrence of resonance within the frequency range of the earthquake response spectrum. Furthermore, static stress caused by deadweight was analyzed. The resultant total maximum stress of the EDB structure was calculated by adding the maximum stresses from both seismic and static loads using the square root of the sum of the squares (SRSS) method. Finally, the structural safety of the EDB was investigated by comparing the resultant total maximum stress with the allowable stress.