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991.
D. Shneerson 《Maritime Policy and Management》1977,4(5):277-280
This brief paper extends the author's comments on Conference pricing policy, and represents a reply to comments made by E. T. Laing. 相似文献
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Chemical analysis, tensile, Charpy, DW NDT and fracture mechanics toughness data are presented for a grade A steel plate from the Kowloon Bridge, a sister ship of Derbyshire. The plate is shown to have poor toughness under dynamic loading conditions. The results leave open the possibility that brittle fracture could have contributed to a structural failure in the Derbyshire even at the high temperature of +30°C which is reported to have existed at the time of the ship's disappearance. The results are felt to support the proposition that present classification society rules need tightening to reduce the risk of brittle fracture in ships. 相似文献
996.
This paper summarises work done to assess the market potential and likely financial performance of a planned high-speed rail link connecting Sydney, Canberra and Melbourne, under a variety of scenarios concerning the services offered and the possible market responses of the competing transport modes in the corridor. In the Australian context, such a link has the characteristics of an essentially new transport mode since existing rail services are extremely poorly developed. The expectation was that generated demand could be a substantial part of the overall ridership. A programme of market research was commissioned by the private consortium considering the project, designed to support forecasting models capable of predicting both diverted and generated travel on the new service. A major survey of current travellers was conducted in 1988, followed by an extensive collection of stated preference evidence about the factors affecting the travel decisions of both existing travellers and those who had not recently made any journeys in the corridor. The paper focuses mainly on the design and organisation of the surveys, on the analysis approach, and on the methods used to generate forecasts for simulated populations and scenarios. 相似文献
997.
Validation of an Articulated Vehicle Simulation 总被引:2,自引:0,他引:2
D.J. Cole D. Cebon 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1992,21(1):197-223
Tests were performed on a typical UK articulated vehicle to measure dynamic tyre forces and sprung mass accelerations. The measured road profile data and vehicle response data are used to determine some of the important characteristics of articulated vehicle vibration behaviour. In particular, roll motions and their effect on dynamic tyre forces are examined. The measured data are used to validate two and three-dimensional computer models of the vehicle. Attention is given to modelling the tandem leaf-spring trailer suspension. The conditions under which a two-dimensional model can accurately simulate vehicle behaviour are examined. 相似文献
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大型加强板结构焊接顺序的效果研究(英文) 总被引:1,自引:0,他引:1
Welding sequence has a significant effect on distortion pattern of large orthogonally stiffened panels normally used in ships and offshore structures. These deformations adversely affect the subsequent fitup and alignment of the adjacent panels. It may also result in loss of structural integrity. These panels primarily suffer from angular and buckling distortions. The extent of distortion depends on several parameters such as welding speed, plate thickness, welding current, voltage, restraints applied to the job while welding, thermal history as well as sequence of welding. Numerical modeling of welding and experimental validation of the FE model has been carried out for estimation of thermal history and resulting distortions. In the present work an FE model has been developed for studying the effect of welding sequence on the distortion pattern and its magnitude in fabrication of orthogonally stiffened plate panels. 相似文献
1000.
This article investigates the carpool mode choice option in the context of overall commuting mode choice preferences. The
article uses a hybrid discrete choice modelling technique to jointly model the consideration of carpooling in the choice set
formation as well as commuting mode choice together with the response bias corrections through the accommodation of measurement
equations. A cross-nested error structure for the econometric formulation is used to capture correlations among various commuting
modes and carpool consideration in the choice set. Empirical models are estimated using a data set collected through a week-long
commuter survey in Edmonton, Alberta. The empirical model reveals many behavioural details of commuting mode choice and carpooling.
Interestingly, it reveals that interactions between various Travel Demand Management (TDM) tools with the carpooling option
can be different at different level of decision making (choice set formation level and final choice making level). 相似文献