A New Method with High Confidence for Validation of Computer Simulation Models of Flight Systems

Computer simulation models may by used to gain further information about missile performance variability. Model validation is an important aspect of the test program for a missile system. Validation provides a basis for confidence in the model's results and is a necessary step if the model is to be used to draw inference about the behavior of the real missile. This paper is a review of methods useful for validation of computer simulation models of missile systems and provides a new method with high degree of confidence for validation of computer simulation models of missile systems. Some examples of the use of the new method in validating computer simulation models are given.     

Integrating complex system dynamics of pandemic influenza with a multi-criteria decision making model for evaluating public health strategies

Recent developments in computational sciences and computer modeling have allowed emergency preparedness exercises to include simulation models as supporting tools.These simulation models are generally built for predicting temporal and geographic patterns of disease spread.However sole use of simulation models in exercise design falls short in terms of incorporating policy decision makers’ preferences into decision-making processes.In this paper,a general framework for exercising public health preparedness plans with a decision support system is presented to integrate estimation of key epidemiological parameters with a system dynamics model of an outbreak.A multi-criteria decision making framework,an Analytical Hierarchy Process model,is then developed and integrated with the simulation model to help public health policy makers prioritize their response goals and evaluate mitigation strategies in a table-top exercise environment.     

MODELING AND ANALYSIS OF ENERGY SYSTEM BASED ON COMPLEX ADAPTIVE SYSTEM

Complex adaptive system (CAS) is a kind of complex system in natural and artificial systems. In this paper, the theory of complex adaptive system is introduced at first. Considering the characteristic of energy system, it can be regarded as a complex adaptive system. After the evolutionary law is analysed, the energy complex system model is established based on CAS and application tool SWARM, which is a simulation software platform. The model differs from the models as well as methods developed before. As an application, China's energy system is simulated with the model established above. China's future total energy demand in the future, energy structure and related in fluence on environment are presented.     

舰载相控阵雷达仿真系统研究与实现

对于舰载相控阵雷达这类复杂系统的仿真,软件系统的设计起着至关重要的作用。为了更有效的进行舰载相控阵雷达的仿真研究,在模块化的基础上,引入了分层设计的思想,建立了分层模块化、易于扩展的仿真软件体系结构,给出了总仿真流程,并着重分析研究了其核心模块的功能、原理和实现流程,构建了仿真软件系统。仿真结果充分验证了模型和方法的可行性和有效性。

Abstract：

The design of software system is very important to the simulation of complex system such as shipborne phased array radar. To make the research of shipborne phased array radar simulation more efficiency, the idea of layered design was imported based on modularization, a hierarchy modularized and easy expansible simulation software architecture was established, and the whole simulation flow was suggested, the function and the theory and the realization flow of the core model was mainly researched, and the simulation software system was developed. The result of the simulation has validated the model and the method.     

Model algorithm control using neural networks for input delayed nonlinear control system

The performance of the model algorithm control method is partially based on the accuracy of the system’s model. It is difficult to obtain a good model of a nonlinear system, especially when the nonlinearity is high. Neural networks have the ability to "learn"the characteristics of a system through nonlinear mapping to represent nonlinear functions as well as their inverse functions. This paper presents a model algorithm control method using neural networks for nonlinear time delay systems. Two neural networks are used in the control scheme. One neural network is trained as the model of the nonlinear time delay system, and the other one produces the control inputs. The neural networks are combined with the model algorithm control method to control the nonlinear time delay systems. Three examples are used to illustrate the proposed control method. The simulation results show that the proposed control method has a good control performance for nonlinear time delay systems.     

FLUID-BASED SIMULATION APPROACH FOR HIGH VOLUME CONVEYOR TRANSPORTATION SYSTEMS

High volume conveyor systems in distribution centers have very large footprint and can handlelarge volumes and hold thousands of items.Traditional discrete-event cell-based approach to simulatesuch networks becomes computationally challenging.An alternative approach,in which the traffic isrepresented by segments of fluid flow of different density instead of individual packages,is presentedin this paper to address this challenge.The proposed fluid-based simulation approach is developedusing a Hybrid Petri Nets framework.The underlying model is a combination of an extension of aBatches Petri Nets(BPN)and a Stochastic Petri Nets(SPN).The extensions are in the inclusion ofrandom elements and relaxation of certain structural constraints.Some adaptations are also made to fitthe target system modeling.The approach is presented with an example.     

New model for load-sharing k-out-of-n: G system with different components

On the basis of capacity flow model, a new model is developed for a load-sharing k-out-of-n： G system consisting of different components, to describe the increase of the same component＇s failure rates under different loads. All components have exponential life distributions and are nonrepairable in the system. Reliability of load- sharing 2-out- of-3： G system is calculated and some special cases for the system are discussed. The calculation and discussions show that the model is right and practical.     

基于作战单元的装备综合保障仿真评估研究

针对装备综合保障仿真评估中的三个方面的问题,提出了基于装备作战单元的建模方法,说明了针对装备作战单元建立综合保障仿真评估Petri网模型的方法,并给出了两个具体的仿真流程,说明了具体系统实现的方法。最后,以某装备作战单元为例,将获取的该装备的实际保障工作相关数据,按照所建立的仿真模型的输入要求输入仿真模型,根据模型输出数据,对仿真结果进行分析评估。

Abstract：

According to the three problems in simulation of ILS evaluation, the means of modeling, the method of building Petri net model of ILS simulation to the equipment basic combat unit, and the method of building the system were put forward. Taking an equipment as an example, input the actual support data to the simulation model constructed, and then the simulation result was analyzed. It proves that the model is correct and feasible.     

Cooperative advertising and pricing models in a dynamic marketing channel

This paper studies dynamic pricing and cooperative advertising strategies in a two-member channel of distribution. We propose differential game models that incorporate the carryover effects of advertising over time for both manufacturer and retailer. Two different models are studied. Firstly, we discussed a non-cooperative differential game which the manufacturer supports partially the cost of the promotion activities. Secondly, both channel members cooperatively determine their respective strategies. In these two cases, dynamic cooperative advertising and pricing strategies are characterized. Then numerical simulation method is applied to analyze the sensitivity of main model parameters and compare the main results of the two models. The simulation results show that the cooperative model achieves better coordination than the non-cooperative model with the following features： all channel members achieve higher advertising efforts and profit level in the cooperative case rather than in the non-cooperative case.     

文丘里管内空化演变模型研究

以文丘里管空化发生器为对象,通过考虑水中空气析出与消解过程的时变性,建立了水气两相动态空化模型。运用FLUENT软件对水气两相流流动问题进行三维数值模拟研究,获得了文丘里管喉口直径、进口压力等对汽含率变化的影响规律。数值模拟结果与实验相对比表明,汽含率随进口压力增加而增加;如果喉径增大,可通过增加进口压力作为补偿,以达到同样的空化效果;出口锥角为20°和8°文丘里管的空化效果对比依赖于进口压力、喉径等条件;模拟条件下串联文丘里管不能实现两级空化。     

舰船喷水推进系统数学建模及动态工况仿真研究

对舰船喷水推进系统而言，动态工况下喷水推进泵的工作安全性是一个十分重要的研究课题，而控制系统参数设定的正确与否将在很大程度上决定动态工况下喷水推进泵能否安全可靠工作。首先建立了适用于系统动态工况仿真的舰船喷水推进系统数学模型及仿真模型，然后从避免喷水推进泵在动态工况过程中工作曲线进入使用限制区域的角度出发，重点对舰船加速和回转两类动态工况进行了仿真研究，并依据仿真结果对相应控制参数的正确设定提供指导。     

电子对抗效能评估仿真系统的实现

介绍了一个基于攻防对抗环境的电子对抗效能评估计算机仿真系统。文中分析了国内外在电子战效能评估仿真领域内的研究现状,论述了该仿真系统的技术实现思路,重点介绍了其场景想定模块、态势显示模块和效能评估模块。还介绍了该仿真系统模型实现中的几个关键问题,包括辐射源威胁等级的确定算法,以及神经网络应用于干扰资源分配的组合优化方法。该仿真系统的实现可以辅助部队改进电子战训练手段,提高训练水平。     

基于LS-SVM的燃料电池控制建模的研究

由于直接甲醇燃料电池数学模型的复杂性难以满足工程上对DMFC控制系统的设计，提出一种基于最小二乘支持向量机建模算法，用具有RBF核函数的LS-SVM离线建立DMFC电堆的非线性模型；仿真和实验结果表明了该建模方法具有建模简单、模型精度高等优点，亦证明了该算法的有效性和优越性。研究结果对直接甲醇燃料电池控制系统的建模和控制具有一定的实用价值。     

仿生水下机器人运动仿真技术研究

以哈尔滨工程大学仿生水下机器人“仿生-Ⅰ”为研究对象,建立了其运动仿真模型。采用水下机器人六自由度空间运动模型,对仿生水下机器人与传统水下机器人区别较大的推进系统、操纵系统以及附加质量的变化等进行了阐述。利用该模型进行的运动仿真结果和“仿生-Ⅰ”水池试验吻合的较好,表明该仿真模型是符合实际的。本研究也为仿生水下机器人运动控制研究提供了平台,对今后的工作有较大的现实意义。     

基于简化活性污泥数学模型的污水处理仿真研究

现有的活性污泥数学模型结构复杂、参数众多，直接用于污水处理的系统仿真有一定的困难。针对这一问题，对活性污泥1号模型ASMI面向应用进行合理的简化，得到适合描述活性污泥推流式工艺碳去除过程的模型ASP-CR．该模型的组分、反应过程和参数的数量都大大减少，并对溶解氧组分进行了特殊处理一用现场的测量值代替预测值。基于试模型建立了污水处理仿真系统，解决了数据转换和参数校正的问题．通过对海城污水处理厂处理过程的实时模拟，验证了系统的正确性和实用性。     

船舶蒸汽系统管道仿真方法研究

根据船舶饱和蒸汽系统管道的工作特点和结构特点,将复杂的蒸汽管网分为大直径蒸汽管道和小直径蒸汽管网两类仿真对象,根据质量守恒、能量守恒定律针对这两类仿真对象分别建立了两相箱体模型和流体网络模型。考虑了流体网络中网络节点与外界环境的散热,提出了流体网络节点压力、温度、焓的修正方法。在某核动力装置模拟器上进行的仿真实验表明,该模型能够较好地反映船舶饱和蒸汽系统管道运行的动态特性。     

声纳目标模拟器回波信号的数学模型

介绍复杂传感器阵列回波信号的数学建模问题，所讨论的传感器阵列是一个具有多层结构的体积阵，根据该阵列的工作特性，通过解析和归纳相结合的方法构造出了它的混合模型，同时通过分析、推进建立起其机理模型，对这两种模型进行仿真，分析，最后确认：影响大型复杂传感器阵列信号的因素很多，也很复杂 ，难以作出解析表达。机理建模不能正确反映该系统的本质属性，混合模型较适用于复杂传感器阵列。     

拥挤交通流的行为分析与仿真建模

从分析拥挤状况的交通行为特性出发，建立了相应的仿真模型。该模型在跟车子模型加入了随机扰动项，换道子模型的可行性检测中加入了前后间距不足时司机的减速行为。与传统模型相比该模型能更好地反映拥挤流下的交通行为，更适合于拥挤状况的交通微观仿真。     

高速公路交通仿真软件开发

为能对汽车控制系统进行有效的实地测试,从而设计开发了基于英国典型高速公路路段的交通模型。该模型提供了对英国高速公路交通流量模拟、路面状况模拟、交通规则模拟及路面用户的微观行为模拟。驾驶员模型包括道路汽车跟随模拟和汽车超车模拟。通过对本交通模型微观参数的优化,使所开发的交通模型能与实地测试数据相符合,从而能更真实地仿真实际高速公路的环境。基于该模型所开发出的具有图形用户界面的能为汽车控制系统的测试与评估提供有效的支持。