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It is well known that the wave motion is a really complex process and hard to be simulated. The paper mainly solves the difficult problem of numerical simulation of wave disturbances in ship motion simulation area. The wave disturbance force and moment acting on the ship sailing on the sea are simulated. Based on statistics superposition theory, Pierson-Moskowitz (P-M) single-parameter standard wave...
The effects of idler spacing selection on belt conveyor power consumption have been discussed. A mathematical model to analyze the relation between total life cycle cost and belt, idler sets and driver units is presented, which is a way of reducing belt conveyor investment costs. Based on the calculation of belt tension and power consumption, a large long belt conveyor with typical three-roll troughing...
Non-equilibrium melting of bulk aluminum during continuous heating at ultra-high heating rates is studied with molecular dynamics simulations. During the simulations, the inter-atomic interactions are described with Sutton-Chen type EAM potential. Strong correlation between the melting behavior and the heating rate are observed. High heating rate will enhance the atomic diffusion and defect formation,...
In flexible manufacturing systems (FMS), each job is formed of a set of operations that should be executed consecutive. Determining the sequence of operations and assigning proper machine to each operation are two important problems in scheduling FMS's. This is an NP-hard problem. Recently using heuristic methods, numerous algorithms are presented for solving this problem. In this paper for scheduling...
The aim of the paper is to validate the implicit finite difference NND scheme, first developed in early 1990's for use in CFD-CSD interaction problems. The focus was on implementing the existing numerical scheme of NND for validating the unsteady flow over NACA0012 airfoil using thin-layer Navier-Stokes equation. The equation was coupled with the structural dynamic model to identify the conventional...
Resource co-allocation is one of the crucial technologies affecting the utility and quality of services of large-scale distributed environments by simultaneously allocating multiple resources to one application. This paper concentrated on the problem to guarantee the QoS of co-allocation jobs via advance reservation and investigated the performances of two typical scheduling algorithms with and without...
The results of analysis of the influence of weather conditions on the frequency of accidents on the railway. The factors that significantly increase the risk of accidents were identified on basis of the daily statistics of weather conditions. The model which allows to combine a set of weather factors in a single indicator of the emergency danger with accounting of degree of their influence on the...
Tire irregular wear brings more vibration, noise and safety problems than normal wear, which is more dangerous and makes tire junked earlier than default life. This paper built one tire 3-dof theoretical model to deal with the tire irregular wear problems caused by tread vibration in numerical method. The model included the vibration caused by forced-displacement, velocity and displacement feedback...
Topology control is an important research direction in wireless sensor networks, by selecting a good topology control mechanisms is good for improving the efficiency of network communication and prolonging the life cycle of network. Based on the analysis algorithms of TopDisc algorithm, this thesis introduces an improved algorithm - proposes a topology control algorithm based on energy and power control...
Since ten years ago, many efforts have been accomplished to increase the power of intrusion detection/prevention systems. In this paper, we proposed all intrusion detection/prevention systems such as IDSs, Honeypots, Snorts, Firewalls, etc and provided a collaboration platform to detect/prevent any anomaly by centralized control via distributed verified servers. We accomplished this work by a protocol,...
Strategic marketing positioning is the core of the modern marketing theory and practice and at the same time it is a complex socio-economic systems, it's necessary to study the strategic marketing positioning from the system perspective to tap its inner mechanism. In this paper, through the establishment of system dynamics model and simulation on strategic marketing positioning system, confirmed that...
On the basis of deeply analyzing determination methods for voids in current specifications of cement pavement, three-dimensional models were set up using the ANSYS finite element method for voids beneath slab corner and slab edge to calculate deflection values under different void depth, void area, and load transfer capacity. Relying on Yantai-Weihai expressway, detection data for deflection using...
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