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This paper provides a two stage stochastic model for an international air cargo forwarding problem under uncertainty. The air forwarders have to make a decision about the number of containers to be booked for the hob and regions in advance before accurate customers information becomes available, which is called the first stage decision. In the second stage, when the accurate information is realized,...
Most of simulation is based on ideal situation, but the real logistics system is complex and variable. Multi-resolution modeling can meet needs of different environments on the simulation, and adapt to the diversity, from different angles and aspects of simulation modeling. Based on the research of MRM, the method of aggregation and disaggregation is analyzed, the paradigm of aggregation and disaggregation...
Mechanical expression of diaphragm type air spring can be summarized based on the engineering thermodynamics theory and the geometry, material and contact nonlinear mechanical characteristics of the air spring is theoretically studied, which helps to be gained the treatment method in FE. The finite element model is built in terms of the FEM and the elastic characteristics of air spring is analyzed...
A mechanical model of the air spring with an additional chamber was built with considering the temperature influence. The static and dynamic external characteristics of the air spring were also studied by comparing the results of the simulation with the experiment. The research shows the larger the additional volume is, the smaller the spring stiffness, the air spring inherent damping will tend to...
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