A Collaborative Platform for Complex Product Development Based on Multi-Domain Unified Modeling and Simulation

In order to intensify market competition, manufacturing enterprises must improve their product innovation capability. It is difficult to integrate the system modeling, simulation and collaborative process management in complex product development. A collaborative platform for complex product development based on multi-domain unified modeling and simulation is proposed in this paper. The architecture of the platform is firstly stated. The idea and realization of three key technologies, i.e. multi-domain modeling and simulation for complex product, knowledge management for product design and simulation, multi-domain collaborative mechanism, are emphasized. Finally, an industry case is given. The demonstration of the system shows that integration architecture is the effective infrastructure for multi-domain collaborative product development.

Modelica语言及其多领域统一建模与仿真机理

详细介绍了Modelica语言及其主要特点,系统地阐述了Modelica语言的多领域统一建模与仿真原理,分析了Modelica语言适合于复杂系统建模的内在原因,探讨了基于Modelica语言的复杂产品建模方法,综述了基于Modelica语言的建模仿真工具研究现状,总结了采用Modelica语言进行多领域统一建模的优势。

基于模型的虚实结合多机协同鉴定性试验技术

针对地面试验环境下多机协同鉴定性试验的多机联合运行、虚实结合的特点,提出一种基于模型的虚实结合多机协同鉴定性试验技术。采用虚实结合技术进行试验验证环境架构设计,由半物理飞机(机载设备、少量辅助仿真模型)、核心机飞机(机载系统计算机类设备、补充仿真模型)、数字飞机(任务系统模型、飞行仿真模型)作为验证对象,通过“模型在环”和“以实补虚”的方式,采用鉴定性试验采信流程,结合虚实接口适配技术,克服机载设备或机载系统的缺失或功能不完善影响全系统综合试验开展困难,解决传统的接口级仿真无法在时序、功能逻辑上满足全系统综合试验的需求等问题。实现全流程快速仿真迭代验证,提前发现系统涌现性,给出系统设计优劣的决策判据,支撑系统设计的快速迭代优化,缩减研制周期和成本。

Multi-Objective Optimization of Aluminum Alloy Electric Bus Frame Connectors for Enhanced Durability

The widespread adoption of aluminumalloy electric buses,known for their energy efficiency and eco-friendliness,faces a challenge due to the aluminum frame’s susceptibility to deformation compared to steel.This issue is further exacerbated by the stringent requirements imposed by the flammability and explosiveness of batteries,necessitating robust frame protection.Our study aims to optimize the connectors of aluminum alloy bus frames,emphasizing durability,energy efficiency,and safety.This research delves into Multi-Objective Coordinated Optimization(MCO)techniques for lightweight design in aluminum alloy bus body connectors.Our goal is to enhance lightweighting,reinforce energy absorption,and improve deformation resistance in connector components.Three typical aluminum alloy connectors were selected and a design optimization platform was built for their MCO using a variety of software and methods.Firstly,through three-point bending experiments and finite element analysis on three types of connector components,we identified optimized design parameters based on deformation patterns.Then,employing Optimal Latin hypercube design(OLHD),parametric modeling,and neural network approximation,we developed high-precision approximate models for the design parameters of each connector component,targeting energy absorption,mass,and logarithmic strain.Lastly,utilizing the Archive-based Micro Genetic Algorithm(AMGA),Multi-Objective Particle Swarm Optimization(MOPSO),and Non-dominated SortingGenetic Algorithm(NSGA2),we explored optimized design solutions for these joint components.Subsequently,we simulated joint assembly buckling during bus rollover crash scenarios to verify and analyze the optimized solutions in three-point bending simulations.Each joint component showcased a remarkable 30%–40%mass reduction while boosting energy absorption.Our design optimization method exhibits high efficiency and costeffectiveness.Leveraging contemporary automation technology,the design optimization platform developed in this study is poised to facilitate intelligent optimization of lightweight metal components in future applications.

新型教学方法在消化系统教学中的应用

随着现代医学专业需求的不断变化,医学教育正在进行着从“以教师为主导的被动灌输式”向“以学生为中心的自主学习式”的转变。消化内科作为医学基础学科之一,在教学内容和方式方法上也发生着重大变革。鉴于目前从教到学范式转变的大背景下,应更加注重教学的针对性、实用性和先进性,以现代医学科学技术发展中的新理论、新知识、新技术和新方法为主要内容,进行专业实践、知识更新和科研学术发展等方面在医学教育中的方式变革,就基于案例的协作学习、展示型翻转课堂、多学科协作、模拟教学、对分课堂等新型教学方法及模式在消化系统教学中的应用展开讨论,为提高医学院校及教学医院的教学效果并培养综合素质过硬的专科医生提供教育模式新思路。

Closed-Form Models of Accuracy Loss due to Subsampling in SVD Collaborative Filtering

We postulate and analyze a nonlinear subsampling accuracy loss(SSAL)model based on the root mean square error(RMSE)and two SSAL models based on the mean square error(MSE),suggested by extensive preliminary simulations.The SSAL models predict accuracy loss in terms of subsampling parameters like the fraction of users dropped(FUD)and the fraction of items dropped(FID).We seek to investigate whether the models depend on the characteristics of the dataset in a constant way across datasets when using the SVD collaborative filtering(CF)algorithm.The dataset characteristics considered include various densities of the rating matrix and the numbers of users and items.Extensive simulations and rigorous regression analysis led to empirical symmetrical SSAL models in terms of FID and FUD whose coefficients depend only on the data characteristics.The SSAL models came out to be multi-linear in terms of odds ratios of dropping a user(or an item)vs.not dropping it.Moreover,one MSE deterioration model turned out to be linear in the FID and FUD odds where their interaction term has a zero coefficient.Most importantly,the models are constant in the sense that they are written in closed-form using the considered data characteristics(densities and numbers of users and items).The models are validated through extensive simulations based on 850 synthetically generated primary(pre-subsampling)matrices derived from the 25M MovieLens dataset.Nearly 460000 subsampled rating matrices were then simulated and subjected to the singular value decomposition(SVD)CF algorithm.Further validation was conducted using the 1M MovieLens and the Yahoo!Music Rating datasets.The models were constant and significant across all 3 datasets.

基于信息模型的铁路桥梁协同设计方法研究

当前,铁路桥梁协同设计点位部署方式一般设定为独立目标式,协同的效率较低,导致最终得出的荷载传递比下降,为此文章提出对基于信息模型的铁路桥梁协同设计方法的实践与分析研究。结合当前需求,采用层级的方式,强化协同的效率,部署铁路桥梁协同点位层级,并设定数据共享机制。以此为基础,设计信息模型铁路桥梁协同结构,采用自适应修正的方式来实现协同处理。测试结果表明:对比于BIM技术铁路桥梁协同设计方法、位移处理铁路桥梁协同设计方法,此次所设计的信息模型铁路桥梁协同设计方法应用效果更佳,得出的荷载传递比均可以达到12.55以上,这说明在信息模型的辅助下,铁路桥梁协同设计方法更加灵活、多变,具有实际的应用价值。

基于SIMULINK/FLUENT的PEMFC系统的协同仿真

提出了基于SIMULINK/FLUENT的质子交换膜燃料电池系统协同仿真方法,结合SIMULINK和FLUENT各自的功能,利用SIMULINK的S-函数及FLUENT的日志文件开发了两者的接口,通过共享数据文件的方式实现了两程序之间数据的同步传递,初步建立了燃料电池模拟系统的三维协同仿真平台。最后,通过数值算例仿真在质量守恒的意义下验证了协同仿真平台的动态数学模型的正确性。

A solution of multidisciplinary collaborative simulation for complex engineering systems in a distributed heterogeneous environment

This paper presents an integrated approach to multidisciplinary collaborative simulation for complex engineering systems. The formulized paradigm of multidisciplinary collaborative simulation for com- plex engineering systems is principally analyzed. An IEEE HLA and web services based framework is proposed to provide a heterogeneous, distributed and collaborative running environment where multidisciplinary modeling, running management and post-processing of collaborative simulation are undertaken. The mechanism of multidisciplinary collaborative modeling, disciplinary model transformation, and time-synchronized simulation advancement are studied in detail. A prototype with the functions of multidisciplinary modeling, running management and post-processing for collaborative simulations is developed, and a typical complex engineering system is chosen as a case study to demonstrate the effectiveness of this new approach towards collaborative simulation.

面向生产计划分析的协同制造过程建模语言及建模仿真系统

跨企业协同制造涉及要素种类多、联动关系复杂、内外部不确定性影响大,导致协同运行能力弱。针对其顶层统筹管理能力弱、缺乏有效的计划分析手段等问题,提出面向生产计划分析的协同制造过程建模语言,为决策层提供不依赖具体生产数据、兼顾不确定因素的领域专用抽象建模和模型仿真工具。总结并凝练协同制造的领域知识,定义其概念模型,基于概念模型制定协同制造过程建模语言CoM-PML;开发基于CoM-PML的建模和仿真系统POMES4CM,通过执行多过程仿真协助企业管理人员分析产品齐套周期、资源利用率等,辅助决策。选取3种复杂产品的协同制造流程进行案例验证,得到具有指导意义的过程模型和生产计划,验证方法和系统的有效性。

基于驾驶员模型的六足机器人自主/协同决策

重载六足机器人在野外地形环境移动作业时的决策智能水平亟待提高。然而,当机器人在尚未形成合理的决策结构层次时,直接采用其与环境进行交互方式进行常规的强化学习训练,将导致机器人的行为决策过于发散。因此,本文首先利用一种符合驾驶员决策逻辑的分步训练神经网络,得到驾驶员的决策经验模型,使机器人快速形成自主决策智能。此外,为融合人机决策优势,本文基于合作博弈理论,提出一种消除人机协同决策指令冲突的方法。搭建面向重载六足机器人人机协同决策的半物理仿真实验系统,开展实验的结果表明,机器人通过学习驾驶员先验模型和自主训练,其决策效果可接近驾驶员决策水平,同时人机协同决策指令可有效弥补单智能体决策指令的缺陷,在规则沟壑地形下协同决策指令的碰撞率指标优于驾驶员单智能体指令23.8%,障碍地形下协同决策指令的能量消耗指标优于机器自主单智能体指令34.1%。

舰载战斗机多传感器协同探测模型设计与仿真

为提升舰载战斗机多传感器协同探测作战效能,基于空中截击战情想定,按照作战空域从远到近,建立了舰载战斗机空域增程搜索、雷达一发多收、雷达红外融合探测、编队协同制导和雷达多波束探测场景模型。在超视距、中距和近距搜索阶段,重点对多传感器协同探测模式中的增程探测、探测及干扰和多波束探测进行了仿真分析。根据不同作战距离,创新性开展了作战流程下多传感器协同探测模式设计。

基于系统动力学的科技成果转化模型构建

在产学研协同创新三螺旋模型的基础上,利用系统动力学(SD)模型构建云南省科技成果转化模型,并对系统进行仿真分析,得出结论。首先将系统划分为政府支持子系统、高校支持子系统和企业支持子系统,实现三螺旋模型的动态循环;然后结合三个子系统的划分情况构建云南科技成果转化模型的因果图;最后构建云南省科技成果转化系统动力学模型,通过建立云南省科技成果转化系统动态流图,剖析影响因素的相互作用,从各要素的协同机理和云南省科技成果转化系统实际结果出发,将产学研系统内各要素进行量化并设置相应参数方程。经检验,该模型的预测值与实际值基本吻合,拟合程度良好。在三螺旋模型中,资金是最重要的要素之一,经系统仿真分析得出,资金投入的改变对科技成果转化有着不可忽视的影响,政府应该加大对教育和科技等方面的资金投入,从源头提高科技成果的质量,不能仅在科技成果转化的中间环节发力,只有提高科技成果本身的质量,其转化的价值才会随之提高。

基于数字孪生的铁路货运站场资源可视化系统

针对铁路货运站场资源占用规模大、设施设备种类多、调度作业频繁复杂、站场内部资源缺乏系统性管理等问题,设计基于数字孪生的铁路货运站场资源可视化系统。结合站场资源管理的实际需求,详细阐述数字孪生应用原理及架构,通过精细化建模与仿真、交互与协同、数据融合和分析等关键技术,实现了对站场箱位、货位、股道、车辆等信息的维护和管理。应用表明,该系统可增强站场内部资源间的协同性及数据共享能力,有助于提高铁路货运站场的作业效率和管理水平。

基于BIM模型的建筑工程协同设计及施工模拟技术

建设项目往往具有不确定性,方案变化频繁,因此通常难以制定可靠可行的方案。随着BIM技术的发展,建筑工程项目通过可视化的BIM模拟技术可实现更好的规划。本文重点梳理了BIM模型技术在建筑施工过程中的应用,提出基于BIM模型的多人协同设计方法及项目成本估算方法,实现了建筑施工过程的5D模拟,为建筑工程的可视化管理提供了创新性技术手段,破解了建筑施工工序繁杂多变、信息化水平不高和智能化落后的现状。

基于“云+边缘”的建模仿真架构

面对当前复杂体系仿真中大量边缘设备的加入而带来的高实时性、交互性的需求,本文将云与边缘协同计算的技术引入体系仿真中,使用KubeEdge云边协同计算开源框架搭建由中心云、边缘云和设备终端组成的新型高效仿真架构。中心云对边缘云进行管理和监控,协调各节点完成体系的协同仿真。边缘云提供高实时的仿真服务。设备终端为用户提供任务请求和查看结果的门户。基于“云+边缘”的仿真架构可以显著减少数据传输,提高仿真服务响应的实时性,对提高仿真效率、节约计算资源具有重要意义。

自动上料取纸系统协同作业分析

近年来,随着我国科学技术与工业水平的不断普及与发展,在工业制造行业中,机械手与自动化设备的应用也越来越广泛。文中针对玻璃切割浸泡生产线的第一道工序,设计了一套自动上料取纸系统,包括系统组成与现场布局,接着对上料取纸系统的协同作业进行了分析,最后基于Matlab仿真软件对系统进行运动仿真,并对搭建的实验平台进行测试。结果证明,上料取纸系统可实现协同作业,且满足生产需要,具有实用价值。

Analysis and Optimization of Transient Mode Switching Behavior for Power Split Hybrid Electric Vehicle with Clutch Collaboration

The power split hybrid electric vehicle(HEV)adopts a power coupling configuration featuring dual planetary gearsets and multiple clutches,enabling diverse operational modes through clutch engagement and disengagement.The multi-clutch configuration usually involves the collaboration of two clutches during the transient mode switching process,thereby substantially elevating control complexity.This study focuses on power split HEVs that integrate multi-clutch mechanisms and investigates how different clutch collaboration manners impact the characteristics of transient mode switching.The powertrain model for the power-split HEV is established utilizing matrix-based methodologies.Through the formulation of clutch torque curves and clutch collaboration models,this research systematically explores the effects of clutch engagement timing and the duration of clutch slipping state on transient mode switching behaviors.Building upon this analysis,an optimization problem for control parameters pertaining to the two collaborative clutches is formulated.The simulated annealing algorithm is employed to optimize these control parameters.Simulation results demonstrate that the clutch collaboration manners have a great influence on the transient mode switching performance.Compared with the pre-calibrated benchmark and the optimal solution derived by the genetic algorithm,the maximal longitudinal jerk and clutch slipping work during the transient mode switching process is reduced obviously with the optimal control parameters derived by the simulated annealing algorithm.The study provides valuable insights for the dynamic coordinated control of the power-split HEVs featuring complex clutch collaboration mechanisms.

产业技术链知识协同网络动态演化及仿真

知识协同是产业技术链形成和发展的关键动力,清晰识别知识协同演化过程有助于提升产业技术链知识管理及创新能力。基于产业技术链知识协同内涵,明确知识吸收能力、转移能力、整合能力等知识协同主体属性,依照知识协同关系、吸收知识、整合知识、创新知识等环节构建产业技术链知识协同网络动态演化模型。经比较,该模型显示了更优的稳定性。通过仿真分析连接节点数、增加新边比率、知识吸收能力、知识整合能力和知识协作创新等行为,揭示知识协同网络时空演化机理,从而有效提升产业技术链知识协同水平。

飞机燃油系统组态监控设计

为了解决对飞机燃油系统工作状态的实时监控问题,基于DDS分布式仿真组态监控平台建立了飞机燃油系统的组态监控模型。详细介绍了飞机燃油系统的结构组成以及工作原理,并依据燃油系统仿真模型的运行原理建立了组态原理图。集成测试结果表明,该组态模型能够实现对飞机燃油系统的组态化监控,进一步完善飞机分布式仿真组态监控系统的功能,提高了飞机机电系统的协同仿真验证效率。