Virtual test system for permanent-magnet DC motor

In order to obtain the primary parameters and operating characteristics of a DC motor without directly measuring its torque and rational speed, it is proposed to use a PC and a data acquisition card to acquire both the dynamic and static data of armature current to establish the performance of a DC permanent magnet motor. The accuracy and validity of this virtual test system proposed were verified by comparing the measurements made with the system proposed with the measurements made with conventional torque meters. It is concluded from the results of comparison that from the mathematic model established for the DC permant magnet motors, both major parameters and operating characteristics can be directly established for the DC motors without measuring their torques and rotational speed, a perfect on line measurement and test system has been established for the DC permanent magnet motors using the theory of virtual test system. The system proposed features shorter test time, higher efficiency and lower cost.

Stereoscopic Camera-Sensor Model for the Development of Highly Automated Driving Functions within a Virtual Test Environment

The need for efficient and reproducible development processes for sensor and perception systems is growing with their increased use in modern vehicles. Such processes can be achieved by using virtual test environments and virtual sensor models. In the context of this, the present paper documents the development of a sensor model for depth estimation of virtual three-dimensional scenarios. For this purpose, the geometric and algorithmic principles of stereoscopic camera systems are recreated in a virtual form. The model is implemented as a subroutine in the Epic Games Unreal Engine, which is one of the most common Game Engines. Its architecture consists of several independent procedures that enable a local depth estimation, but also a reconstruction of a whole three-dimensional scenery. In addition, a separate programme for calibrating the model is presented. In addition to the basic principles, the architecture and the implementation, this work also documents the evaluation of the model created. It is shown that the model meets specifically defined requirements for real-time capability and the accuracy of the evaluation. Thus, it is suitable for the virtual testing of common algorithms and highly automated driving functions.

Methodical Approach to Integrate Human Movement Diversity in Real-Time into a Virtual Test Field for Highly Automated Vehicle Systems

Recently, virtual realities and simulations play important roles in the development of automated driving functionalities. By an appropriate abstraction, they help to design, investigate and communicate real traffic scenario complexity. Especially, for edge cases investigations of interactions between vulnerable road users (VRU) and highly automated driving functions, valid virtual models are essential for the quality of results. The aim of this study is to measure, process and integrate real human movement behaviour into a virtual test environment for highly automated vehicle functionalities. The overall system consists of a georeferenced virtual city model and a vehicle dynamics model, including probabilistic sensor descriptions. By motion capture hardware, real humanoid behaviour is applied to a virtual human avatar in the test environment. Through retargeting methods, which enable the independency of avatar and person under test (PuT) dimensions, the virtual avatar diversity is increased. To verify the biomechanical behaviour of the virtual avatars, a qualitative study is performed, which funds on a representative movement sequence. The results confirm the functionality of the used methodology and enable PuT independence control of the virtual avatars in real-time.

A Method for Modeling the Virtual Instrument Automatic Test System Based on the Petri Net

Virtual instrument is playing the important role in automatic test system. This paper introduces a composition of a virtual instrument automatic test system and takes the VXIbus based a test software platform which is developed by CAT lab of the UESTC as an example. Then a method to model this system based on Petri net is proposed. Through this method, we can analyze the test task scheduling to prevent the deadlock or resources conflict. At last, this paper analyzes the feasibility of this method.

The engine performance LabVIEW virtual instrument test system design

This paper adopts American National Instruments (NI) Company’s LabVIEW and LabVIEW RT virtual instrument softwareplatform and lots of things for this engine performance LabVIEW virtual instrument test system, such as the matched NI PCI dataCollection Card, NI SCXI signal-adjusting instrument and NI compact FieldPoint (cFP) distributed I/O real time system hardware.This system has realized multi performances’parallel test; and it can complete load, torsional moment, rotate speed, power, pressureand temperature’s real time monitoring automatically according to user’s setting; and finally through TCP/IP protocol it realizes testdata’s teleshare and telecontrol that user put on the test system. This system has such character as short development period, highuse efficiency and low cost, at the same time it has strong extensibility and reusability, so it has very high applied cost.

Realization of Reconfigurable Virtual Environments for Virtual Testing

This paper presents the design and implementation of reconfigurable virtual environments (VEs) for virtual testing. It proposes a hybrid design approach that is derived from a so-called integration and composition of the reconfiguration strategy. The designing process has thus evolved from binding virtual objects using reconfiguration rules within the context of virtual testing scenarios. Therefore reconfigurable virtual environments are established with improved flexibility and scalability, tailored to a wide range of virtual testing applications. Those virtual environments integrate virtual testing scenarios, data acquisition, databases, rule mapping and application interfaces, which yield modular testing functions and an open-ended system architecture with a set of extensible interface tools to realize data exchange within reconfigurable VEs. This enables virtual testing scenarios to be reconfigured interactively based on real time data and communication between virtual environments and real environments. A virtual testing application has been implemented using reconfigurable VEs. Keywords Virtual environment - virtual testing - reconfigurable virtual reality Wenyan Wu graduated from Dalian University of Technology, China, with BSc and MSc in 1988 and 1991 respectively. She earned her PhD degree from University of Derby, UK, in 2002. She had taught and researched in Harbin Institute of Technology, China and De Montfort University, UK. She is currently a senior lecturer in simulation and virtual reality at Staffordshire University, UK. Her research interests include computer graphics, Virtual Reality and Augmented Reality system, advanced interface, modelling and simulation, distribution system.Zhengxu Zhao BSc, MSc, PhD, CEng, CITP, MBCS, full Professor in Applied Computing, Director of Virtual Reality Centre. He is also a Cheng Kong Scholar Project Professor in Virtual Reality Technology and Director of Virtual Reality Research Centre at the Southeast University, P R China. Professor Zhao’s research interests include computing graphics and VR systems, industrial process simulation, CIM and manufacturing management systems.

Modeling of Electromagnetic Wave Propagation and Its Applicationin Virtual Test

With the development of virtual test,the computation of the effect of different weather conditions on electromagnetic wave propagation is required in many simulation systems. Firstly,this paper presents a unique point of view for computing the electromagnetic wave attenuation ratio under different weather conditions by means of an independent electromagnetic wave propagation component that can be directly implemented in virtual test, and is easy to configure and easy to reuse. We present an analysis of the principles of electromagnetic wave propagation and the algorithms designed for realization of various propagation models within the electromagnetic wave propagation component. Secondly,this paper presents a use-case analysis and outlines the design of the component,verifies the developed models under various weather conditions,and obtains equivalent values as those obtained theoretically. Finally,we build a virtual test system,verify the system in different weather conditions,and again obtain equivalent values to those obtained theoretically. The algorithms in the electromagnetic wave propagation component are developed in the C language, which substantially improves the computational speed,and meets the real-time requirements of the virtual testing platform.

NUMERICAL MODELING OF MULTI-CYLINDER ELECTRO-HYDRAULIC SYSTEM AND CONTROLLER DESIGN FOR SHOCK TEST MACHINE

A high fidelity dynamic model of a high-energy hydraulically-actuated shock test machine for heavy weight devices is presented to satisfy the newly-built shock resistance standard and simulate the actual underwater explosion environments in laboratory as well as increase the testing capability of shock test machine. In order to produce the required negative shock pulse in the given time duration, four hydraulic actuators are utilized. The model is then used to formulate an advanced feedforward controller for the system to produce the required negative waveform and to address the motion synchronization of the four cylinders. The model provides a safe and easily controllable way to perform a ＂virtual testing＂ before starting potentially destructive tests on specimen and to predict performance of the system. Simulation results have demonstrated the effectiveness of the controller.

Scheduling method based on virtual flattened architecture for Hierarchical system-on-chip

As the technology of IP-core-reused has been widely used, a lot of intellectual property （IP） cores have been embedded in different layers of system-on-chip （SOC）. Although the cycles of development and overhead are reduced by this method, it is a challenge to the SOC test. This paper proposes a scheduling method based on the virtual flattened architecture for hierarchical SOC, which breaks the hierarchical architecture to the virtual flattened one. Moreover, this method has more advantages compared with the traditional one, which tests the parent cores and child cores separately. Finally, the method is verified by the ITC＇02 benchmark, and gives good results that reduce the test time and overhead effectively.

灌木平茬机切割系统参数优化设计与验证

为分析圆盘锯式切割系统的切割机理,在Solidworks中建立单组圆盘锯及灌木枝条的简化模型,并在动力学分析软件ABAQUS中进行仿真分析,研究灌木切割过程中工作参数与圆锯片参数的关系。同时,以锯片转速、行进速度、枝径为影响因素,以锯切力为评价指标,对其影响的因素进行虚拟正交试验,并用Design Expert动态响应软件进行分析,得到响应面回归方程,得知当圆锯转速为2500r/min、前进速度为0.9m/s时平茬效果较好。用小型灌木平茬机上进行实地试验,结果表明破茬率和留茬高度均能满足农艺要求。

AFDX网络配置测试技术研究

终端系统作为AFDX网络数据传输的关键部分,其优劣决定着整个AFDX网络的通信性能。为了测试验证端系统功能,评估AFDX网络的传输性能,提出了一种AFDX网络配置测试方法。设计端系统的配置测试规范,建立端系统测试总体框架,对端系统的测试响应机制进行研究,规范化测试流程,生成的配置文件作为算法设计的输入信息。设计激励数据生成算法,建立激励数据生成框架,对数据发送的约束条件进行形式化定义,利用SMT求解器,生成激励数据发送时刻表。激励数据发送时刻表作为输入,利用TestCenter网络测试平台进行仿真实验,实验结果证明该方法能模拟当前AFDX网络配置在高负载数据流下的有效性。

基于LabWindows/CVI的导弹舵机性能测试系统

为了满足舵机在性能测试过程中多目标任务的需求,设计一款舵机性能测试系统。该系统能够完成舵机空载性能测试,在四通道加载台的配合下能够模拟舵机在空中所受的负载力矩,实现加载测试。该系统基于LabWindows/CVI虚拟仪器设计平台,通过RS422传输协议实现多点多通道数据传输,产生多种测试激励信号,完成舵机上电自检、信号反馈、数据采集与信息显示等功能。通过试验,测试效果达到了相应设计的要求,相较于传统舵机测试系统提高了测试效率与测试精度。

虚拟仪器的电机测试系统设计研究

由于目前的微型计算机通用试验系统大都是使用Windows的多媒体软件,其计时精度和实时性都很差。本文提出利用虚拟仪器技术对电机测试试验系统进行仿真,并把软件工程学的概念引入到该试验系统的设计中,实现了各部分的功能相对的独立性,从而保证了该试验系统的可靠性。在此基础上,借助LabVIEW自身的特性,实现了基于操作系统的较为准确的计时工作,并具备了很强的移植能力。实践证明,此系统性能可靠、操作简便、实用方便,同时也减少了试验费用,能够很好地适应现场试验的需要。

智能虚拟仿真平台下《药品检测》课程项目制教学研究

本研究从《药品检测》课程的教学需求出发,提出智能虚拟仿真平台下《药品检测》课程项目制教学模式,从智能虚拟仿真平台环境、教学内容、教学方法与过程三个方面进行模式解析,并总结出相应教学模式的创新性和优势分析。智能虚拟仿真平台下《药品检测》课程项目制教学是《药品检测》课程教学的有益探索,具有重要的指导和借鉴意义。

信息化背景下综合设计性虚拟仿真实验评价系统构建

为对综合设计性虚拟仿真实验进行有效的评价建立实验评价系统。研究分析目前已有的在线开放课程评价体系和虚拟仿真实验的系统架构,把多元智能理论和学习结果分类理论应用于虚拟仿真实验评价系统中,构建包括理论知识维度、思维创新维度、实验技能测试维度和情感态度维度等多个维度的综合设计性虚拟仿真实验评价体系。

列控系统仿真测试关键技术

随着我国高铁线路网络化规模持续扩大及列控系统运用需求日趋复杂,仿真测试手段作为高铁现场测试的有效补充和完善,已成为列控系统测试技术发展的必然趋势。开展适用于工程化的列控系统仿真测试技术研究,构建基于云平台的总体架构;重点研究平台快速搭建与切换、虚实结合与虚实互换、测试案例编制与序列自动生成等关键测试技术,从而实现仿真平台自动测试功能,并结合实际线路进行广泛验证。应用效果表明,仿真测试平台能有效提高测试的覆盖度和测试深度,并在现场试验前提前发现问题,满足工程化应用需求。列控系统仿真测试平台的成功研制,为现场联调联试提供了重要补充。

基于TestStand的音频芯片自动测量系统

为了解决利用仪器手动测量音频芯片性能效率不高,易出错的问题,根据音频芯片测试系统的原理,以LabVIEW、TestStand为平台进行系统化,模块化自动测量。本文介绍了该系统的硬件、软件构成,详细介绍软件设计及功能实现流程。运行结果表明:该系统运行稳定,精度高。

体系联合试验环境下LVC资源集成构建

针对当前试验环境建设分散且共享共用欠缺等问题,提出一种体系联合试验环境下真实、虚拟和构造(LVC)资源集成技术。首先,分析了体系试验系统和试验资源;然后,研究了资源接入中间件接入试验的原理,设计了资源接入中间件组成架构和应用流程,并实现了实装、半实物模拟器和异构仿真系统的接入与交互;最后,开展了典型对抗场景下体系试验验证。应用实例表明,该技术能够解决能力验证不充分的问题,可为作战体系中新战法验证提供新思路。

机车辅助驾驶系统的仿真平台研究

介绍一种基于仿真平台的机车辅助驾驶系统研究方法。机车辅助驾驶系统已成为提高行驶安全和效率的关键技术,然而,直接在实际机车上进行系统测试可能存在风险且成本高昂。因此,开发适用于机车辅助驾驶系统的仿真平台是必要的。通过对现有仿真平台的综述,分析其优点和不足,并提出一种基于虚拟现实技术的仿真平台设计方案。该平台能够模拟各种驾驶场景和交通情况,并允许研究人员对机车辅助驾驶系统进行准确的性能评估和功能测试。最后,通过实验验证该仿真平台的有效性和可行性,为机车辅助驾驶系统的研发提供有力支持。