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An extended car-following model is proposed by incorporating the anticipative information by vehicle to vehicle. The stability condition of the proposed model is obtained by using the linear stability theory. The results show that the anticipative information can promote the stability of traffic flow. Numerical simulations are carried out, and the results are consonant with the theory ones.
The characteristics of reverse logistics make the inventory management issues very complex. Once shortage happens, the reverse logistics network nodes will have insufficient workload even stop work. The previous studies about shortage more established on the assumptions of complete backlogging or complete losing, but the partial backlogging problem is less discussed. So this study develops a partial...
This paper, MATALAB was used to simulate series-connecting of the ground-source heat pump and the solar collector. Firstly, the simulation models of heat pump unit, ground heat-exchanger and solar collector were established. Secondly, the dynamic simulation model of combined heating system under series-connecting mode was obtained through the established sub-models and mutual coupling relations. Finally,...
In this paper, we proposed a new car following model based on the Full Velocity Difference (FVD) model, with the acceleration of the front car considered. Compared with the FVD model, the improved model can simulate the motions of cars starting from a traffic signal more nature. Numerical simulation results show that the stability of the improved model is better than the FVD model, with appropriate...
The management of cold storage chain is an important part of the management of supply chain and logistics. The development of Chinese cold storage chain logistics is relatively backward, which affects the food industry seriously. Cold store play an important role in cold storage chain logistics. The field flow is the key technological parameter in cold store. A three dimensional mathematical model...
Based on turbulent model, this paper has established a 3D flow and sediment mathematical model under orthogonal curvilinear system, numerically simulating the free water surface, the flow velocity structure, the sediment content distribution of a 180°sharp curved open channel, as well as the bed deformation effected by complicated flow field of curved channel. Validation and analysis have been made...
To achieve the dimensional synthesis of planar four-bar linkages, it established the numerical atlases of coupler rotation-angle operator harmonic characteristic parameters and coupler rotation-angle function's harmonic components firstly. It achieved the basic dimension type of linkages and the mathematical model of coupler path based on complex-vector theory secondly, then acquired the formula of...
This paper presents a numerical simulation based on computational fluid dynamics (CFD) method on the enhancement of natural ventilation in an industrial workshop with heat source induced by solar chimney (SC). Four types of SC were designed to attach to the top and southern roof of the workshop. Realizable k-ε turbulent model and DO (discrete ordinate) radiation model were used to calculate the air...
On the basis of hypothesis of limited time and multistage order, the order strategy was brought forward for the changing charge, and the multistage stock model with deteriorating lose were constituted for the Single Short Life Products (SSLPs) and Multiple Short Life Products (MSLPs) under different order strategies. In addition, that the combined order mode was better than the other order modes for...
An accurate and highly efficient semi-implicit three-dimensional tidal model is developed and has been applied to real area. In the model, the pressure gradient in the momentum equations and the velocities in the vertically integrated continuity equations are discretized using the θ-method, the vertical mixing terms are discretized implicitly and all the other terms are discretized explicitly. The...
Based on the analysis of blasting smog-dust source and its Characters, the Movement of blasting smog and dust is discussed. The concept of particle system is developed. Further more, the blasting smog-dust movement and the plume diffusion in atmosphere was profound explored. Finally, the real-time simulation of Movement of Smog-Dust generated by blasting is implemented and generated a program named...
The settling mathematics model and numerical method is the main topic in the recent study about sedimentation process. The ideal particular materials are chosen as testing materials, in which the flocculation among the solids particles does not take place or slight flocculation takes place based on material nature characteristics. However, they can not reflect the actual industry sedimentation process...
The multitone signals make traditional analysis difficult even impossible if the circuits are highly nonlinear. Using multiple time variables allow an efficient representation of these signals. In this formulation the components with different rates of variation are decoupled, each disparate signal being represented by its own artificial time scale. The differential algebraic equations describing...
With the trend from micro- to nanoelectronics the control of production deviations can not keep pace with the reduction of the absolute sizes of semiconductor devices. This results in an increased number of circuits beyond specification. The presented symbolic methods for reducing behavioral models with parameter variations assist designing and optimizing robust electronic circuits to increase the...
This article presents a new approach to fast mixed-mode simulation of phase-locked loops (PLLs) in time domain using Spice-like simulators and behavioral Verilog-A baseband (BB) models of voltage-controlled oscillators (VCO) and frequency dividers (FD). Other PLL blocks like phase-frequency detectors (PFD), charge pumps (CP), and loop filters (LP) can be transistor level and/or behavioral models....
The constraints to manage in a telecom splitter design are numerous and according to a given splitter structure, the choice became difficult. The paper proposes a software tool allowing the design of such filters. This one carries out the modelling of the electrical circuit configurations, and creates the corresponding computation code, used for simulation or optimisation. The methodology is detailed...
On the basis of the modified nodal analysis, universal matrices-stamps are defined for modeling several types of current conveyor. From these stamps, the so-called Dragonfly Mason-Coates' graphs are derived for a fast hand-and-paper symbolic analysis of current-conveyor circuits.
A systematic design methodology for low-noise amplifiers (LNAs) is introduced. This methodology follows a bottom-up approach that employs a multi-objective evolutionary optimization algorithm, which is used at two levels. First, it is used to generate Pareto-based performance models for integrated planar inductors. To do so, an electromagnetic simulator that takes into account the inductor's layout,...
The paper deals with the implementation of multi-domain symbolic analysis in a new program, SAMD (Symbolic Analysis of Mechatronic Drives), developed with the emphasis on linearized hybrid systems combining classical electrical circuits, controllers, electro-mechanical converters and mechanical parts of electric drives. The systems analyzed can be composed of both basic elements and more complex blocks...
New analytical equations are proposed for oscillation amplitude of the MOS Colpitts oscillator. These equations are obtained from a large signal analysis. The analysis is based on a reasonable estimation for the output waveform. The estimated waveform should satisfy the nonlinear differential equations governing the circuit. The validity of the resulted equations is verified through simulations using...
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