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Jun Tajima Fujio Momiyama Naohiro Yuhara 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2006,44(2):107-138
The design problem of a two-bag air suspension system for heavy-duty vehicles is formulated as a two-level (suspension system level and component level) optimization problem. At the suspension system level, optimal stiffness matrix of leaf spring, characteristics of damper and upper rod layout are determined by solving a multi-objective constrained optimization problem with response surface. At the component level, shape and thickness of the leaf spring are formed using cubic-spline curves to make the stiffness matrix as close to the target values cascaded from suspension system level as possible. Simulations using a vehicle model described by multi-body model and FEM of the novel leaf spring validate the suspension system thus derived. 相似文献
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Fujio Kaneko 《Journal of Marine Science and Technology》2002,7(1):1-16
At the 62nd MSC conference (MSC62) in 1993, the UK proposed a new methodology for the consideration of safety regulations.
This method is called formal safety assessment (FSA). FSA is an application of probabilistic safety assessment (PSA). Risk
is used as an index of safety. One of the most important parts of FSA is to evaluate the risk to a ship when it is equipped
with the safety measures recommended by the proposed safety regulations. The National Maritime Research Institute (NMRI, formerly
the Ship Research Institute) has been developing a method which allows the risk to be obtained holistically by utilizing a
scientific method. To obtain the risk, the probability and consequences of every accident must be evaluated. This paper examines
the following points: (a) a holistic methodology for risk evaluation; (b) a method used in the process of estimating the probability
of collision; (c) a method to reduce the numbers of fire escalation scenarios; (d) a trial risk evaluation of cabin fire.
Received: January 10, 2002 / Accepted: April 18, 2002 相似文献
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